]> code.delx.au - gnu-emacs/blob - src/sysdep.c
Port redirect-debugging-output to non-GNU/Linux
[gnu-emacs] / src / sysdep.c
1 /* Interfaces to system-dependent kernel and library entries.
2 Copyright (C) 1985-1988, 1993-1995, 1999-2016 Free Software
3 Foundation, Inc.
4
5 This file is part of GNU Emacs.
6
7 GNU Emacs is free software: you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation, either version 3 of the License, or (at
10 your option) any later version.
11
12 GNU Emacs is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
19
20 #include <config.h>
21
22 #include <execinfo.h>
23 #include "sysstdio.h"
24 #ifdef HAVE_PWD_H
25 #include <pwd.h>
26 #include <grp.h>
27 #endif /* HAVE_PWD_H */
28 #include <limits.h>
29 #include <unistd.h>
30
31 #include <c-ctype.h>
32 #include <utimens.h>
33
34 #include "lisp.h"
35 #include "sheap.h"
36 #include "sysselect.h"
37 #include "blockinput.h"
38
39 #if defined DARWIN_OS || defined __FreeBSD__
40 # include <sys/sysctl.h>
41 #endif
42
43 #ifdef __FreeBSD__
44 /* Sparc/ARM machine/frame.h has 'struct frame' which conflicts with Emacs's
45 'struct frame', so rename it. */
46 # define frame freebsd_frame
47 # include <sys/user.h>
48 # undef frame
49
50 # include <math.h>
51 #endif
52
53 #ifdef WINDOWSNT
54 #define read sys_read
55 #define write sys_write
56 #ifndef STDERR_FILENO
57 #define STDERR_FILENO fileno(GetStdHandle(STD_ERROR_HANDLE))
58 #endif
59 #include <windows.h>
60 #endif /* not WINDOWSNT */
61
62 #include <sys/types.h>
63 #include <sys/stat.h>
64 #include <errno.h>
65
66 /* Get SI_SRPC_DOMAIN, if it is available. */
67 #ifdef HAVE_SYS_SYSTEMINFO_H
68 #include <sys/systeminfo.h>
69 #endif
70
71 #ifdef MSDOS /* Demacs 1.1.2 91/10/20 Manabu Higashida, MW Aug 1993 */
72 #include "msdos.h"
73 #endif
74
75 #include <sys/param.h>
76 #include <sys/file.h>
77 #include <fcntl.h>
78
79 #include "systty.h"
80 #include "syswait.h"
81
82 #ifdef HAVE_SYS_UTSNAME_H
83 #include <sys/utsname.h>
84 #include <memory.h>
85 #endif /* HAVE_SYS_UTSNAME_H */
86
87 #include "keyboard.h"
88 #include "frame.h"
89 #include "termhooks.h"
90 #include "termchar.h"
91 #include "termopts.h"
92 #include "process.h"
93 #include "cm.h"
94
95 #include "gnutls.h"
96 /* MS-Windows loads GnuTLS at run time, if available; we don't want to
97 do that during startup just to call gnutls_rnd. */
98 #if 0x020c00 <= GNUTLS_VERSION_NUMBER && !defined WINDOWSNT
99 # include <gnutls/crypto.h>
100 #else
101 # define emacs_gnutls_global_init() Qnil
102 # define gnutls_rnd(level, data, len) (-1)
103 #endif
104
105 #ifdef WINDOWSNT
106 #include <direct.h>
107 /* In process.h which conflicts with the local copy. */
108 #define _P_WAIT 0
109 int _cdecl _spawnlp (int, const char *, const char *, ...);
110 int _cdecl _getpid (void);
111 /* The following is needed for O_CLOEXEC, F_SETFD, FD_CLOEXEC, and
112 several prototypes of functions called below. */
113 #include <sys/socket.h>
114 #endif
115
116 #include "syssignal.h"
117 #include "systime.h"
118
119 /* ULLONG_MAX is missing on Red Hat Linux 7.3; see Bug#11781. */
120 #ifndef ULLONG_MAX
121 #define ULLONG_MAX TYPE_MAXIMUM (unsigned long long int)
122 #endif
123
124 /* Declare here, including term.h is problematic on some systems. */
125 extern void tputs (const char *, int, int (*)(int));
126
127 static const int baud_convert[] =
128 {
129 0, 50, 75, 110, 135, 150, 200, 300, 600, 1200,
130 1800, 2400, 4800, 9600, 19200, 38400
131 };
132
133 /* If FD is not already open, arrange for it to be open with FLAGS. */
134 static void
135 force_open (int fd, int flags)
136 {
137 if (dup2 (fd, fd) < 0 && errno == EBADF)
138 {
139 int n = open (NULL_DEVICE, flags);
140 if (n < 0 || (fd != n && (dup2 (n, fd) < 0 || emacs_close (n) != 0)))
141 {
142 emacs_perror (NULL_DEVICE);
143 exit (EXIT_FAILURE);
144 }
145 }
146 }
147
148 /* Make sure stdin, stdout, and stderr are open to something, so that
149 their file descriptors are not hijacked by later system calls. */
150 void
151 init_standard_fds (void)
152 {
153 /* Open stdin for *writing*, and stdout and stderr for *reading*.
154 That way, any attempt to do normal I/O will result in an error,
155 just as if the files were closed, and the file descriptors will
156 not be reused by later opens. */
157 force_open (STDIN_FILENO, O_WRONLY);
158 force_open (STDOUT_FILENO, O_RDONLY);
159 force_open (STDERR_FILENO, O_RDONLY);
160 }
161
162 /* Return the current working directory. The result should be freed
163 with 'free'. Return NULL on errors. */
164 char *
165 emacs_get_current_dir_name (void)
166 {
167 # if HAVE_GET_CURRENT_DIR_NAME && !BROKEN_GET_CURRENT_DIR_NAME
168 # ifdef HYBRID_MALLOC
169 bool use_libc = bss_sbrk_did_unexec;
170 # else
171 bool use_libc = true;
172 # endif
173 if (use_libc)
174 return get_current_dir_name ();
175 # endif
176
177 char *buf;
178 char *pwd = getenv ("PWD");
179 struct stat dotstat, pwdstat;
180 /* If PWD is accurate, use it instead of calling getcwd. PWD is
181 sometimes a nicer name, and using it may avoid a fatal error if a
182 parent directory is searchable but not readable. */
183 if (pwd
184 && (IS_DIRECTORY_SEP (*pwd) || (*pwd && IS_DEVICE_SEP (pwd[1])))
185 && stat (pwd, &pwdstat) == 0
186 && stat (".", &dotstat) == 0
187 && dotstat.st_ino == pwdstat.st_ino
188 && dotstat.st_dev == pwdstat.st_dev
189 #ifdef MAXPATHLEN
190 && strlen (pwd) < MAXPATHLEN
191 #endif
192 )
193 {
194 buf = malloc (strlen (pwd) + 1);
195 if (!buf)
196 return NULL;
197 strcpy (buf, pwd);
198 }
199 else
200 {
201 size_t buf_size = 1024;
202 buf = malloc (buf_size);
203 if (!buf)
204 return NULL;
205 for (;;)
206 {
207 if (getcwd (buf, buf_size) == buf)
208 break;
209 if (errno != ERANGE)
210 {
211 int tmp_errno = errno;
212 free (buf);
213 errno = tmp_errno;
214 return NULL;
215 }
216 buf_size *= 2;
217 buf = realloc (buf, buf_size);
218 if (!buf)
219 return NULL;
220 }
221 }
222 return buf;
223 }
224
225 \f
226 /* Discard pending input on all input descriptors. */
227
228 void
229 discard_tty_input (void)
230 {
231 #ifndef WINDOWSNT
232 struct emacs_tty buf;
233
234 if (noninteractive)
235 return;
236
237 #ifdef MSDOS /* Demacs 1.1.1 91/10/16 HIRANO Satoshi */
238 while (dos_keyread () != -1)
239 ;
240 #else /* not MSDOS */
241 {
242 struct tty_display_info *tty;
243 for (tty = tty_list; tty; tty = tty->next)
244 {
245 if (tty->input) /* Is the device suspended? */
246 {
247 emacs_get_tty (fileno (tty->input), &buf);
248 emacs_set_tty (fileno (tty->input), &buf, 0);
249 }
250 }
251 }
252 #endif /* not MSDOS */
253 #endif /* not WINDOWSNT */
254 }
255
256 \f
257 #ifdef SIGTSTP
258
259 /* Arrange for character C to be read as the next input from
260 the terminal.
261 XXX What if we have multiple ttys?
262 */
263
264 void
265 stuff_char (char c)
266 {
267 if (! (FRAMEP (selected_frame)
268 && FRAME_LIVE_P (XFRAME (selected_frame))
269 && FRAME_TERMCAP_P (XFRAME (selected_frame))))
270 return;
271
272 /* Should perhaps error if in batch mode */
273 #ifdef TIOCSTI
274 ioctl (fileno (CURTTY()->input), TIOCSTI, &c);
275 #else /* no TIOCSTI */
276 error ("Cannot stuff terminal input characters in this version of Unix");
277 #endif /* no TIOCSTI */
278 }
279
280 #endif /* SIGTSTP */
281 \f
282 void
283 init_baud_rate (int fd)
284 {
285 int emacs_ospeed;
286
287 if (noninteractive)
288 emacs_ospeed = 0;
289 else
290 {
291 #ifdef DOS_NT
292 emacs_ospeed = 15;
293 #else /* not DOS_NT */
294 struct termios sg;
295
296 sg.c_cflag = B9600;
297 tcgetattr (fd, &sg);
298 emacs_ospeed = cfgetospeed (&sg);
299 #endif /* not DOS_NT */
300 }
301
302 baud_rate = (emacs_ospeed < ARRAYELTS (baud_convert)
303 ? baud_convert[emacs_ospeed] : 9600);
304 if (baud_rate == 0)
305 baud_rate = 1200;
306 }
307
308 \f
309
310 #ifndef MSDOS
311
312 /* Wait for the subprocess with process id CHILD to terminate or change status.
313 CHILD must be a child process that has not been reaped.
314 If STATUS is non-null, store the waitpid-style exit status into *STATUS
315 and tell wait_reading_process_output that it needs to look around.
316 Use waitpid-style OPTIONS when waiting.
317 If INTERRUPTIBLE, this function is interruptible by a signal.
318
319 Return CHILD if successful, 0 if no status is available;
320 the latter is possible only when options & NOHANG. */
321 static pid_t
322 get_child_status (pid_t child, int *status, int options, bool interruptible)
323 {
324 pid_t pid;
325
326 /* Invoke waitpid only with a known process ID; do not invoke
327 waitpid with a nonpositive argument. Otherwise, Emacs might
328 reap an unwanted process by mistake. For example, invoking
329 waitpid (-1, ...) can mess up glib by reaping glib's subprocesses,
330 so that another thread running glib won't find them. */
331 eassert (child > 0);
332
333 while ((pid = waitpid (child, status, options)) < 0)
334 {
335 /* Check that CHILD is a child process that has not been reaped,
336 and that STATUS and OPTIONS are valid. Otherwise abort,
337 as continuing after this internal error could cause Emacs to
338 become confused and kill innocent-victim processes. */
339 if (errno != EINTR)
340 emacs_abort ();
341
342 /* Note: the MS-Windows emulation of waitpid calls QUIT
343 internally. */
344 if (interruptible)
345 QUIT;
346 }
347
348 /* If successful and status is requested, tell wait_reading_process_output
349 that it needs to wake up and look around. */
350 if (pid && status && input_available_clear_time)
351 *input_available_clear_time = make_timespec (0, 0);
352
353 return pid;
354 }
355
356 /* Wait for the subprocess with process id CHILD to terminate.
357 CHILD must be a child process that has not been reaped.
358 If STATUS is non-null, store the waitpid-style exit status into *STATUS
359 and tell wait_reading_process_output that it needs to look around.
360 If INTERRUPTIBLE, this function is interruptible by a signal. */
361 void
362 wait_for_termination (pid_t child, int *status, bool interruptible)
363 {
364 get_child_status (child, status, 0, interruptible);
365 }
366
367 /* Report whether the subprocess with process id CHILD has changed status.
368 Termination counts as a change of status.
369 CHILD must be a child process that has not been reaped.
370 If STATUS is non-null, store the waitpid-style exit status into *STATUS
371 and tell wait_reading_process_output that it needs to look around.
372 Use waitpid-style OPTIONS to check status, but do not wait.
373
374 Return CHILD if successful, 0 if no status is available because
375 the process's state has not changed. */
376 pid_t
377 child_status_changed (pid_t child, int *status, int options)
378 {
379 return get_child_status (child, status, WNOHANG | options, 0);
380 }
381
382 \f
383 /* Set up the terminal at the other end of a pseudo-terminal that
384 we will be controlling an inferior through.
385 It should not echo or do line-editing, since that is done
386 in Emacs. No padding needed for insertion into an Emacs buffer. */
387
388 void
389 child_setup_tty (int out)
390 {
391 #ifndef WINDOWSNT
392 struct emacs_tty s;
393
394 emacs_get_tty (out, &s);
395 s.main.c_oflag |= OPOST; /* Enable output postprocessing */
396 s.main.c_oflag &= ~ONLCR; /* Disable map of NL to CR-NL on output */
397 #ifdef NLDLY
398 /* http://lists.gnu.org/archive/html/emacs-devel/2008-05/msg00406.html
399 Some versions of GNU Hurd do not have FFDLY? */
400 #ifdef FFDLY
401 s.main.c_oflag &= ~(NLDLY|CRDLY|TABDLY|BSDLY|VTDLY|FFDLY);
402 /* No output delays */
403 #else
404 s.main.c_oflag &= ~(NLDLY|CRDLY|TABDLY|BSDLY|VTDLY);
405 /* No output delays */
406 #endif
407 #endif
408 s.main.c_lflag &= ~ECHO; /* Disable echo */
409 s.main.c_lflag |= ISIG; /* Enable signals */
410 #ifdef IUCLC
411 s.main.c_iflag &= ~IUCLC; /* Disable downcasing on input. */
412 #endif
413 #ifdef ISTRIP
414 s.main.c_iflag &= ~ISTRIP; /* don't strip 8th bit on input */
415 #endif
416 #ifdef OLCUC
417 s.main.c_oflag &= ~OLCUC; /* Disable upcasing on output. */
418 #endif
419 s.main.c_oflag &= ~TAB3; /* Disable tab expansion */
420 s.main.c_cflag = (s.main.c_cflag & ~CSIZE) | CS8; /* Don't strip 8th bit */
421 s.main.c_cc[VERASE] = CDISABLE; /* disable erase processing */
422 s.main.c_cc[VKILL] = CDISABLE; /* disable kill processing */
423
424 #ifdef HPUX
425 s.main.c_cflag = (s.main.c_cflag & ~CBAUD) | B9600; /* baud rate sanity */
426 #endif /* HPUX */
427
428 #ifdef SIGNALS_VIA_CHARACTERS
429 /* the QUIT and INTR character are used in process_send_signal
430 so set them here to something useful. */
431 if (s.main.c_cc[VQUIT] == CDISABLE)
432 s.main.c_cc[VQUIT] = '\\'&037; /* Control-\ */
433 if (s.main.c_cc[VINTR] == CDISABLE)
434 s.main.c_cc[VINTR] = 'C'&037; /* Control-C */
435 #endif /* not SIGNALS_VIA_CHARACTERS */
436
437 #ifdef AIX
438 /* Also, PTY overloads NUL and BREAK.
439 don't ignore break, but don't signal either, so it looks like NUL. */
440 s.main.c_iflag &= ~IGNBRK;
441 s.main.c_iflag &= ~BRKINT;
442 /* rms: Formerly it set s.main.c_cc[VINTR] to 0377 here
443 unconditionally. Then a SIGNALS_VIA_CHARACTERS conditional
444 would force it to 0377. That looks like duplicated code. */
445 s.main.c_cflag = (s.main.c_cflag & ~CBAUD) | B9600; /* baud rate sanity */
446 #endif /* AIX */
447
448 /* We originally enabled ICANON (and set VEOF to 04), and then had
449 process.c send additional EOF chars to flush the output when faced
450 with long lines, but this leads to weird effects when the
451 subprocess has disabled ICANON and ends up seeing those spurious
452 extra EOFs. So we don't send EOFs any more in
453 process.c:send_process. First we tried to disable ICANON by
454 default, so if a subsprocess sets up ICANON, it's his problem (or
455 the Elisp package that talks to it) to deal with lines that are
456 too long. But this disables some features, such as the ability
457 to send EOF signals. So we re-enabled ICANON but there is no
458 more "send eof to flush" going on (which is wrong and unportable
459 in itself). The correct way to handle too much output is to
460 buffer what could not be written and then write it again when
461 select returns ok for writing. This has it own set of
462 problems. Write is now asynchronous, is that a problem? How much
463 do we buffer, and what do we do when that limit is reached? */
464
465 s.main.c_lflag |= ICANON; /* Enable line editing and eof processing */
466 s.main.c_cc[VEOF] = 'D'&037; /* Control-D */
467 #if 0 /* These settings only apply to non-ICANON mode. */
468 s.main.c_cc[VMIN] = 1;
469 s.main.c_cc[VTIME] = 0;
470 #endif
471
472 emacs_set_tty (out, &s, 0);
473 #endif /* not WINDOWSNT */
474 }
475 #endif /* not MSDOS */
476
477 \f
478 /* Record a signal code and the action for it. */
479 struct save_signal
480 {
481 int code;
482 struct sigaction action;
483 };
484
485 static void save_signal_handlers (struct save_signal *);
486 static void restore_signal_handlers (struct save_signal *);
487
488 /* Suspend the Emacs process; give terminal to its superior. */
489
490 void
491 sys_suspend (void)
492 {
493 #ifndef DOS_NT
494 kill (0, SIGTSTP);
495 #else
496 /* On a system where suspending is not implemented,
497 instead fork a subshell and let it talk directly to the terminal
498 while we wait. */
499 sys_subshell ();
500
501 #endif
502 }
503
504 /* Fork a subshell. */
505
506 void
507 sys_subshell (void)
508 {
509 #ifdef DOS_NT /* Demacs 1.1.2 91/10/20 Manabu Higashida */
510 int st;
511 #ifdef MSDOS
512 char oldwd[MAXPATHLEN+1]; /* Fixed length is safe on MSDOS. */
513 #else
514 char oldwd[MAX_UTF8_PATH];
515 #endif
516 #endif
517 pid_t pid;
518 int status;
519 struct save_signal saved_handlers[5];
520 char *str = SSDATA (encode_current_directory ());
521
522 #ifdef DOS_NT
523 pid = 0;
524 #else
525 {
526 char *volatile str_volatile = str;
527 pid = vfork ();
528 str = str_volatile;
529 }
530 #endif
531
532 if (pid < 0)
533 error ("Can't spawn subshell");
534
535 saved_handlers[0].code = SIGINT;
536 saved_handlers[1].code = SIGQUIT;
537 saved_handlers[2].code = SIGTERM;
538 #ifdef USABLE_SIGIO
539 saved_handlers[3].code = SIGIO;
540 saved_handlers[4].code = 0;
541 #else
542 saved_handlers[3].code = 0;
543 #endif
544
545 #ifdef DOS_NT
546 save_signal_handlers (saved_handlers);
547 #endif
548
549 if (pid == 0)
550 {
551 const char *sh = 0;
552
553 #ifdef DOS_NT /* MW, Aug 1993 */
554 getcwd (oldwd, sizeof oldwd);
555 if (sh == 0)
556 sh = egetenv ("SUSPEND"); /* KFS, 1994-12-14 */
557 #endif
558 if (sh == 0)
559 sh = egetenv ("SHELL");
560 if (sh == 0)
561 sh = "sh";
562
563 /* Use our buffer's default directory for the subshell. */
564 if (chdir (str) != 0)
565 {
566 #ifndef DOS_NT
567 emacs_perror (str);
568 _exit (EXIT_CANCELED);
569 #endif
570 }
571
572 #ifdef MSDOS /* Demacs 1.1.2 91/10/20 Manabu Higashida */
573 {
574 char *epwd = getenv ("PWD");
575 char old_pwd[MAXPATHLEN+1+4];
576
577 /* If PWD is set, pass it with corrected value. */
578 if (epwd)
579 {
580 strcpy (old_pwd, epwd);
581 setenv ("PWD", str, 1);
582 }
583 st = system (sh);
584 chdir (oldwd); /* FIXME: Do the right thing on chdir failure. */
585 if (epwd)
586 putenv (old_pwd); /* restore previous value */
587 }
588 #else /* not MSDOS */
589 #ifdef WINDOWSNT
590 /* Waits for process completion */
591 pid = _spawnlp (_P_WAIT, sh, sh, NULL);
592 chdir (oldwd); /* FIXME: Do the right thing on chdir failure. */
593 if (pid == -1)
594 write (1, "Can't execute subshell", 22);
595 #else /* not WINDOWSNT */
596 execlp (sh, sh, (char *) 0);
597 emacs_perror (sh);
598 _exit (errno == ENOENT ? EXIT_ENOENT : EXIT_CANNOT_INVOKE);
599 #endif /* not WINDOWSNT */
600 #endif /* not MSDOS */
601 }
602
603 /* Do this now if we did not do it before. */
604 #ifndef MSDOS
605 save_signal_handlers (saved_handlers);
606 #endif
607
608 #ifndef DOS_NT
609 wait_for_termination (pid, &status, 0);
610 #endif
611 restore_signal_handlers (saved_handlers);
612 }
613
614 static void
615 save_signal_handlers (struct save_signal *saved_handlers)
616 {
617 while (saved_handlers->code)
618 {
619 struct sigaction action;
620 emacs_sigaction_init (&action, SIG_IGN);
621 sigaction (saved_handlers->code, &action, &saved_handlers->action);
622 saved_handlers++;
623 }
624 }
625
626 static void
627 restore_signal_handlers (struct save_signal *saved_handlers)
628 {
629 while (saved_handlers->code)
630 {
631 sigaction (saved_handlers->code, &saved_handlers->action, 0);
632 saved_handlers++;
633 }
634 }
635 \f
636 #ifdef USABLE_SIGIO
637 static int old_fcntl_flags[FD_SETSIZE];
638 #endif
639
640 void
641 init_sigio (int fd)
642 {
643 #ifdef USABLE_SIGIO
644 old_fcntl_flags[fd] = fcntl (fd, F_GETFL, 0) & ~FASYNC;
645 fcntl (fd, F_SETFL, old_fcntl_flags[fd] | FASYNC);
646 interrupts_deferred = 0;
647 #endif
648 }
649
650 #ifndef DOS_NT
651 static void
652 reset_sigio (int fd)
653 {
654 #ifdef USABLE_SIGIO
655 fcntl (fd, F_SETFL, old_fcntl_flags[fd]);
656 #endif
657 }
658 #endif
659
660 void
661 request_sigio (void)
662 {
663 #ifdef USABLE_SIGIO
664 sigset_t unblocked;
665
666 if (noninteractive)
667 return;
668
669 sigemptyset (&unblocked);
670 # ifdef SIGWINCH
671 sigaddset (&unblocked, SIGWINCH);
672 # endif
673 sigaddset (&unblocked, SIGIO);
674 pthread_sigmask (SIG_UNBLOCK, &unblocked, 0);
675
676 interrupts_deferred = 0;
677 #endif
678 }
679
680 void
681 unrequest_sigio (void)
682 {
683 #ifdef USABLE_SIGIO
684 sigset_t blocked;
685
686 if (noninteractive)
687 return;
688
689 sigemptyset (&blocked);
690 # ifdef SIGWINCH
691 sigaddset (&blocked, SIGWINCH);
692 # endif
693 sigaddset (&blocked, SIGIO);
694 pthread_sigmask (SIG_BLOCK, &blocked, 0);
695 interrupts_deferred = 1;
696 #endif
697 }
698 \f
699 #ifndef MSDOS
700 /* Block SIGCHLD. */
701
702 void
703 block_child_signal (sigset_t *oldset)
704 {
705 sigset_t blocked;
706 sigemptyset (&blocked);
707 sigaddset (&blocked, SIGCHLD);
708 sigaddset (&blocked, SIGINT);
709 pthread_sigmask (SIG_BLOCK, &blocked, oldset);
710 }
711
712 /* Unblock SIGCHLD. */
713
714 void
715 unblock_child_signal (sigset_t const *oldset)
716 {
717 pthread_sigmask (SIG_SETMASK, oldset, 0);
718 }
719
720 #endif /* !MSDOS */
721 \f
722 /* Saving and restoring the process group of Emacs's terminal. */
723
724 /* The process group of which Emacs was a member when it initially
725 started.
726
727 If Emacs was in its own process group (i.e. inherited_pgroup ==
728 getpid ()), then we know we're running under a shell with job
729 control (Emacs would never be run as part of a pipeline).
730 Everything is fine.
731
732 If Emacs was not in its own process group, then we know we're
733 running under a shell (or a caller) that doesn't know how to
734 separate itself from Emacs (like sh). Emacs must be in its own
735 process group in order to receive SIGIO correctly. In this
736 situation, we put ourselves in our own pgroup, forcibly set the
737 tty's pgroup to our pgroup, and make sure to restore and reinstate
738 the tty's pgroup just like any other terminal setting. If
739 inherited_group was not the tty's pgroup, then we'll get a
740 SIGTTmumble when we try to change the tty's pgroup, and a CONT if
741 it goes foreground in the future, which is what should happen. */
742
743 static pid_t inherited_pgroup;
744
745 void
746 init_foreground_group (void)
747 {
748 pid_t pgrp = getpgrp ();
749 inherited_pgroup = getpid () == pgrp ? 0 : pgrp;
750 }
751
752 /* Block and unblock SIGTTOU. */
753
754 void
755 block_tty_out_signal (sigset_t *oldset)
756 {
757 #ifdef SIGTTOU
758 sigset_t blocked;
759 sigemptyset (&blocked);
760 sigaddset (&blocked, SIGTTOU);
761 pthread_sigmask (SIG_BLOCK, &blocked, oldset);
762 #endif
763 }
764
765 void
766 unblock_tty_out_signal (sigset_t const *oldset)
767 {
768 #ifdef SIGTTOU
769 pthread_sigmask (SIG_SETMASK, oldset, 0);
770 #endif
771 }
772
773 /* Safely set a controlling terminal FD's process group to PGID.
774 If we are not in the foreground already, POSIX requires tcsetpgrp
775 to deliver a SIGTTOU signal, which would stop us. This is an
776 annoyance, so temporarily ignore the signal.
777
778 In practice, platforms lacking SIGTTOU also lack tcsetpgrp, so
779 skip all this unless SIGTTOU is defined. */
780 static void
781 tcsetpgrp_without_stopping (int fd, pid_t pgid)
782 {
783 #ifdef SIGTTOU
784 sigset_t oldset;
785 block_input ();
786 block_tty_out_signal (&oldset);
787 tcsetpgrp (fd, pgid);
788 unblock_tty_out_signal (&oldset);
789 unblock_input ();
790 #endif
791 }
792
793 /* Split off the foreground process group to Emacs alone. When we are
794 in the foreground, but not started in our own process group,
795 redirect the tty device handle FD to point to our own process
796 group. FD must be the file descriptor of the controlling tty. */
797 static void
798 narrow_foreground_group (int fd)
799 {
800 if (inherited_pgroup && setpgid (0, 0) == 0)
801 tcsetpgrp_without_stopping (fd, getpid ());
802 }
803
804 /* Set the tty to our original foreground group. */
805 static void
806 widen_foreground_group (int fd)
807 {
808 if (inherited_pgroup && setpgid (0, inherited_pgroup) == 0)
809 tcsetpgrp_without_stopping (fd, inherited_pgroup);
810 }
811 \f
812 /* Getting and setting emacs_tty structures. */
813
814 /* Set *TC to the parameters associated with the terminal FD,
815 or clear it if the parameters are not available.
816 Return 0 on success, -1 on failure. */
817 int
818 emacs_get_tty (int fd, struct emacs_tty *settings)
819 {
820 /* Retrieve the primary parameters - baud rate, character size, etcetera. */
821 memset (&settings->main, 0, sizeof (settings->main));
822 #ifdef DOS_NT
823 #ifdef WINDOWSNT
824 HANDLE h = (HANDLE)_get_osfhandle (fd);
825 DWORD console_mode;
826
827 if (h && h != INVALID_HANDLE_VALUE && GetConsoleMode (h, &console_mode))
828 {
829 settings->main = console_mode;
830 return 0;
831 }
832 #endif /* WINDOWSNT */
833 return -1;
834 #else /* !DOS_NT */
835 /* We have those nifty POSIX tcmumbleattr functions. */
836 return tcgetattr (fd, &settings->main);
837 #endif
838 }
839
840
841 /* Set the parameters of the tty on FD according to the contents of
842 *SETTINGS. If FLUSHP, discard input.
843 Return 0 if all went well, and -1 (setting errno) if anything failed. */
844
845 int
846 emacs_set_tty (int fd, struct emacs_tty *settings, bool flushp)
847 {
848 /* Set the primary parameters - baud rate, character size, etcetera. */
849 #ifdef DOS_NT
850 #ifdef WINDOWSNT
851 HANDLE h = (HANDLE)_get_osfhandle (fd);
852
853 if (h && h != INVALID_HANDLE_VALUE)
854 {
855 DWORD new_mode;
856
857 /* Assume the handle is open for input. */
858 if (flushp)
859 FlushConsoleInputBuffer (h);
860 new_mode = settings->main;
861 SetConsoleMode (h, new_mode);
862 }
863 #endif /* WINDOWSNT */
864 #else /* !DOS_NT */
865 int i;
866 /* We have those nifty POSIX tcmumbleattr functions.
867 William J. Smith <wjs@wiis.wang.com> writes:
868 "POSIX 1003.1 defines tcsetattr to return success if it was
869 able to perform any of the requested actions, even if some
870 of the requested actions could not be performed.
871 We must read settings back to ensure tty setup properly.
872 AIX requires this to keep tty from hanging occasionally." */
873 /* This make sure that we don't loop indefinitely in here. */
874 for (i = 0 ; i < 10 ; i++)
875 if (tcsetattr (fd, flushp ? TCSAFLUSH : TCSADRAIN, &settings->main) < 0)
876 {
877 if (errno == EINTR)
878 continue;
879 else
880 return -1;
881 }
882 else
883 {
884 struct termios new;
885
886 memset (&new, 0, sizeof (new));
887 /* Get the current settings, and see if they're what we asked for. */
888 tcgetattr (fd, &new);
889 /* We cannot use memcmp on the whole structure here because under
890 * aix386 the termios structure has some reserved field that may
891 * not be filled in.
892 */
893 if ( new.c_iflag == settings->main.c_iflag
894 && new.c_oflag == settings->main.c_oflag
895 && new.c_cflag == settings->main.c_cflag
896 && new.c_lflag == settings->main.c_lflag
897 && memcmp (new.c_cc, settings->main.c_cc, NCCS) == 0)
898 break;
899 else
900 continue;
901 }
902 #endif
903
904 /* We have survived the tempest. */
905 return 0;
906 }
907
908 \f
909
910 #ifdef F_SETOWN
911 static int old_fcntl_owner[FD_SETSIZE];
912 #endif /* F_SETOWN */
913
914 /* This may also be defined in stdio,
915 but if so, this does no harm,
916 and using the same name avoids wasting the other one's space. */
917
918 #if defined (USG)
919 unsigned char _sobuf[BUFSIZ+8];
920 #else
921 char _sobuf[BUFSIZ];
922 #endif
923
924 /* Initialize the terminal mode on all tty devices that are currently
925 open. */
926
927 void
928 init_all_sys_modes (void)
929 {
930 struct tty_display_info *tty;
931 for (tty = tty_list; tty; tty = tty->next)
932 init_sys_modes (tty);
933 }
934
935 /* Initialize the terminal mode on the given tty device. */
936
937 void
938 init_sys_modes (struct tty_display_info *tty_out)
939 {
940 struct emacs_tty tty;
941 Lisp_Object terminal;
942
943 Vtty_erase_char = Qnil;
944
945 if (noninteractive)
946 return;
947
948 if (!tty_out->output)
949 return; /* The tty is suspended. */
950
951 narrow_foreground_group (fileno (tty_out->input));
952
953 if (! tty_out->old_tty)
954 tty_out->old_tty = xmalloc (sizeof *tty_out->old_tty);
955
956 emacs_get_tty (fileno (tty_out->input), tty_out->old_tty);
957
958 tty = *tty_out->old_tty;
959
960 #if !defined (DOS_NT)
961 XSETINT (Vtty_erase_char, tty.main.c_cc[VERASE]);
962
963 tty.main.c_iflag |= (IGNBRK); /* Ignore break condition */
964 tty.main.c_iflag &= ~ICRNL; /* Disable map of CR to NL on input */
965 #ifdef INLCR /* I'm just being cautious,
966 since I can't check how widespread INLCR is--rms. */
967 tty.main.c_iflag &= ~INLCR; /* Disable map of NL to CR on input */
968 #endif
969 #ifdef ISTRIP
970 tty.main.c_iflag &= ~ISTRIP; /* don't strip 8th bit on input */
971 #endif
972 tty.main.c_lflag &= ~ECHO; /* Disable echo */
973 tty.main.c_lflag &= ~ICANON; /* Disable erase/kill processing */
974 #ifdef IEXTEN
975 tty.main.c_lflag &= ~IEXTEN; /* Disable other editing characters. */
976 #endif
977 tty.main.c_lflag |= ISIG; /* Enable signals */
978 if (tty_out->flow_control)
979 {
980 tty.main.c_iflag |= IXON; /* Enable start/stop output control */
981 #ifdef IXANY
982 tty.main.c_iflag &= ~IXANY;
983 #endif /* IXANY */
984 }
985 else
986 tty.main.c_iflag &= ~IXON; /* Disable start/stop output control */
987 tty.main.c_oflag &= ~ONLCR; /* Disable map of NL to CR-NL
988 on output */
989 tty.main.c_oflag &= ~TAB3; /* Disable tab expansion */
990 #ifdef CS8
991 if (tty_out->meta_key)
992 {
993 tty.main.c_cflag |= CS8; /* allow 8th bit on input */
994 tty.main.c_cflag &= ~PARENB;/* Don't check parity */
995 }
996 #endif
997
998 XSETTERMINAL(terminal, tty_out->terminal);
999 if (!NILP (Fcontrolling_tty_p (terminal)))
1000 {
1001 tty.main.c_cc[VINTR] = quit_char; /* C-g (usually) gives SIGINT */
1002 /* Set up C-g for both SIGQUIT and SIGINT.
1003 We don't know which we will get, but we handle both alike
1004 so which one it really gives us does not matter. */
1005 tty.main.c_cc[VQUIT] = quit_char;
1006 }
1007 else
1008 {
1009 /* We normally don't get interrupt or quit signals from tty
1010 devices other than our controlling terminal; therefore,
1011 we must handle C-g as normal input. Unfortunately, this
1012 means that the interrupt and quit feature must be
1013 disabled on secondary ttys, or we would not even see the
1014 keypress.
1015
1016 Note that even though emacsclient could have special code
1017 to pass SIGINT to Emacs, we should _not_ enable
1018 interrupt/quit keys for emacsclient frames. This means
1019 that we can't break out of loops in C code from a
1020 secondary tty frame, but we can always decide what
1021 display the C-g came from, which is more important from a
1022 usability point of view. (Consider the case when two
1023 people work together using the same Emacs instance.) */
1024 tty.main.c_cc[VINTR] = CDISABLE;
1025 tty.main.c_cc[VQUIT] = CDISABLE;
1026 }
1027 tty.main.c_cc[VMIN] = 1; /* Input should wait for at least 1 char */
1028 tty.main.c_cc[VTIME] = 0; /* no matter how long that takes. */
1029 #ifdef VSWTCH
1030 tty.main.c_cc[VSWTCH] = CDISABLE; /* Turn off shell layering use
1031 of C-z */
1032 #endif /* VSWTCH */
1033
1034 #ifdef VSUSP
1035 tty.main.c_cc[VSUSP] = CDISABLE; /* Turn off handling of C-z. */
1036 #endif /* VSUSP */
1037 #ifdef V_DSUSP
1038 tty.main.c_cc[V_DSUSP] = CDISABLE; /* Turn off handling of C-y. */
1039 #endif /* V_DSUSP */
1040 #ifdef VDSUSP /* Some systems have VDSUSP, some have V_DSUSP. */
1041 tty.main.c_cc[VDSUSP] = CDISABLE;
1042 #endif /* VDSUSP */
1043 #ifdef VLNEXT
1044 tty.main.c_cc[VLNEXT] = CDISABLE;
1045 #endif /* VLNEXT */
1046 #ifdef VREPRINT
1047 tty.main.c_cc[VREPRINT] = CDISABLE;
1048 #endif /* VREPRINT */
1049 #ifdef VWERASE
1050 tty.main.c_cc[VWERASE] = CDISABLE;
1051 #endif /* VWERASE */
1052 #ifdef VDISCARD
1053 tty.main.c_cc[VDISCARD] = CDISABLE;
1054 #endif /* VDISCARD */
1055
1056 if (tty_out->flow_control)
1057 {
1058 #ifdef VSTART
1059 tty.main.c_cc[VSTART] = '\021';
1060 #endif /* VSTART */
1061 #ifdef VSTOP
1062 tty.main.c_cc[VSTOP] = '\023';
1063 #endif /* VSTOP */
1064 }
1065 else
1066 {
1067 #ifdef VSTART
1068 tty.main.c_cc[VSTART] = CDISABLE;
1069 #endif /* VSTART */
1070 #ifdef VSTOP
1071 tty.main.c_cc[VSTOP] = CDISABLE;
1072 #endif /* VSTOP */
1073 }
1074
1075 #ifdef AIX
1076 tty.main.c_cc[VSTRT] = CDISABLE;
1077 tty.main.c_cc[VSTOP] = CDISABLE;
1078 tty.main.c_cc[VSUSP] = CDISABLE;
1079 tty.main.c_cc[VDSUSP] = CDISABLE;
1080 if (tty_out->flow_control)
1081 {
1082 #ifdef VSTART
1083 tty.main.c_cc[VSTART] = '\021';
1084 #endif /* VSTART */
1085 #ifdef VSTOP
1086 tty.main.c_cc[VSTOP] = '\023';
1087 #endif /* VSTOP */
1088 }
1089 /* Also, PTY overloads NUL and BREAK.
1090 don't ignore break, but don't signal either, so it looks like NUL.
1091 This really serves a purpose only if running in an XTERM window
1092 or via TELNET or the like, but does no harm elsewhere. */
1093 tty.main.c_iflag &= ~IGNBRK;
1094 tty.main.c_iflag &= ~BRKINT;
1095 #endif
1096 #endif /* not DOS_NT */
1097
1098 #ifdef MSDOS /* Demacs 1.1.2 91/10/20 Manabu Higashida, MW Aug 1993 */
1099 if (!tty_out->term_initted)
1100 internal_terminal_init ();
1101 dos_ttraw (tty_out);
1102 #endif
1103
1104 emacs_set_tty (fileno (tty_out->input), &tty, 0);
1105
1106 /* This code added to insure that, if flow-control is not to be used,
1107 we have an unlocked terminal at the start. */
1108
1109 #ifdef TCXONC
1110 if (!tty_out->flow_control) ioctl (fileno (tty_out->input), TCXONC, 1);
1111 #endif
1112 #ifdef TIOCSTART
1113 if (!tty_out->flow_control) ioctl (fileno (tty_out->input), TIOCSTART, 0);
1114 #endif
1115
1116 #if !defined (DOS_NT)
1117 #ifdef TCOON
1118 if (!tty_out->flow_control) tcflow (fileno (tty_out->input), TCOON);
1119 #endif
1120 #endif
1121
1122 #ifdef F_GETOWN
1123 if (interrupt_input)
1124 {
1125 old_fcntl_owner[fileno (tty_out->input)] =
1126 fcntl (fileno (tty_out->input), F_GETOWN, 0);
1127 fcntl (fileno (tty_out->input), F_SETOWN, getpid ());
1128 init_sigio (fileno (tty_out->input));
1129 #ifdef HAVE_GPM
1130 if (gpm_tty == tty_out)
1131 {
1132 /* Arrange for mouse events to give us SIGIO signals. */
1133 fcntl (gpm_fd, F_SETOWN, getpid ());
1134 fcntl (gpm_fd, F_SETFL, fcntl (gpm_fd, F_GETFL, 0) | O_NONBLOCK);
1135 init_sigio (gpm_fd);
1136 }
1137 #endif /* HAVE_GPM */
1138 }
1139 #endif /* F_GETOWN */
1140
1141 #ifdef _IOFBF
1142 /* This symbol is defined on recent USG systems.
1143 Someone says without this call USG won't really buffer the file
1144 even with a call to setbuf. */
1145 setvbuf (tty_out->output, (char *) _sobuf, _IOFBF, sizeof _sobuf);
1146 #else
1147 setbuf (tty_out->output, (char *) _sobuf);
1148 #endif
1149
1150 if (tty_out->terminal->set_terminal_modes_hook)
1151 tty_out->terminal->set_terminal_modes_hook (tty_out->terminal);
1152
1153 if (!tty_out->term_initted)
1154 {
1155 Lisp_Object tail, frame;
1156 FOR_EACH_FRAME (tail, frame)
1157 {
1158 /* XXX This needs to be revised. */
1159 if (FRAME_TERMCAP_P (XFRAME (frame))
1160 && FRAME_TTY (XFRAME (frame)) == tty_out)
1161 init_frame_faces (XFRAME (frame));
1162 }
1163 }
1164
1165 if (tty_out->term_initted && no_redraw_on_reenter)
1166 {
1167 /* We used to call "direct_output_forward_char(0)" here,
1168 but it's not clear why, since it may not do anything anyway. */
1169 }
1170 else
1171 {
1172 Lisp_Object tail, frame;
1173 frame_garbaged = 1;
1174 FOR_EACH_FRAME (tail, frame)
1175 {
1176 if ((FRAME_TERMCAP_P (XFRAME (frame))
1177 || FRAME_MSDOS_P (XFRAME (frame)))
1178 && FRAME_TTY (XFRAME (frame)) == tty_out)
1179 FRAME_GARBAGED_P (XFRAME (frame)) = 1;
1180 }
1181 }
1182
1183 tty_out->term_initted = 1;
1184 }
1185
1186 /* Return true if safe to use tabs in output.
1187 At the time this is called, init_sys_modes has not been done yet. */
1188
1189 bool
1190 tabs_safe_p (int fd)
1191 {
1192 struct emacs_tty etty;
1193
1194 emacs_get_tty (fd, &etty);
1195 #ifndef DOS_NT
1196 #ifdef TABDLY
1197 return ((etty.main.c_oflag & TABDLY) != TAB3);
1198 #else /* not TABDLY */
1199 return 1;
1200 #endif /* not TABDLY */
1201 #else /* DOS_NT */
1202 return 0;
1203 #endif /* DOS_NT */
1204 }
1205
1206 /* Discard echoing. */
1207
1208 void
1209 suppress_echo_on_tty (int fd)
1210 {
1211 struct emacs_tty etty;
1212
1213 emacs_get_tty (fd, &etty);
1214 #ifdef DOS_NT
1215 /* Set raw input mode. */
1216 etty.main = 0;
1217 #else
1218 etty.main.c_lflag &= ~ICANON; /* Disable buffering */
1219 etty.main.c_lflag &= ~ECHO; /* Disable echoing */
1220 #endif /* ! WINDOWSNT */
1221 emacs_set_tty (fd, &etty, 0);
1222 }
1223 \f
1224 /* Get terminal size from system.
1225 Store number of lines into *HEIGHTP and width into *WIDTHP.
1226 We store 0 if there's no valid information. */
1227
1228 void
1229 get_tty_size (int fd, int *widthp, int *heightp)
1230 {
1231 #if defined TIOCGWINSZ
1232
1233 /* BSD-style. */
1234 struct winsize size;
1235
1236 if (ioctl (fd, TIOCGWINSZ, &size) == -1)
1237 *widthp = *heightp = 0;
1238 else
1239 {
1240 *widthp = size.ws_col;
1241 *heightp = size.ws_row;
1242 }
1243
1244 #elif defined TIOCGSIZE
1245
1246 /* SunOS - style. */
1247 struct ttysize size;
1248
1249 if (ioctl (fd, TIOCGSIZE, &size) == -1)
1250 *widthp = *heightp = 0;
1251 else
1252 {
1253 *widthp = size.ts_cols;
1254 *heightp = size.ts_lines;
1255 }
1256
1257 #elif defined WINDOWSNT
1258
1259 CONSOLE_SCREEN_BUFFER_INFO info;
1260 if (GetConsoleScreenBufferInfo (GetStdHandle (STD_OUTPUT_HANDLE), &info))
1261 {
1262 *widthp = info.srWindow.Right - info.srWindow.Left + 1;
1263 *heightp = info.srWindow.Bottom - info.srWindow.Top + 1;
1264 }
1265 else
1266 *widthp = *heightp = 0;
1267
1268 #elif defined MSDOS
1269
1270 *widthp = ScreenCols ();
1271 *heightp = ScreenRows ();
1272
1273 #else /* system doesn't know size */
1274
1275 *widthp = 0;
1276 *heightp = 0;
1277
1278 #endif
1279 }
1280
1281 /* Set the logical window size associated with descriptor FD
1282 to HEIGHT and WIDTH. This is used mainly with ptys.
1283 Return a negative value on failure. */
1284
1285 int
1286 set_window_size (int fd, int height, int width)
1287 {
1288 #ifdef TIOCSWINSZ
1289
1290 /* BSD-style. */
1291 struct winsize size;
1292 size.ws_row = height;
1293 size.ws_col = width;
1294
1295 return ioctl (fd, TIOCSWINSZ, &size);
1296
1297 #else
1298 #ifdef TIOCSSIZE
1299
1300 /* SunOS - style. */
1301 struct ttysize size;
1302 size.ts_lines = height;
1303 size.ts_cols = width;
1304
1305 return ioctl (fd, TIOCGSIZE, &size);
1306 #else
1307 return -1;
1308 #endif /* not SunOS-style */
1309 #endif /* not BSD-style */
1310 }
1311
1312 \f
1313
1314 /* Prepare all terminal devices for exiting Emacs. */
1315
1316 void
1317 reset_all_sys_modes (void)
1318 {
1319 struct tty_display_info *tty;
1320 for (tty = tty_list; tty; tty = tty->next)
1321 reset_sys_modes (tty);
1322 }
1323
1324 /* Prepare the terminal for closing it; move the cursor to the
1325 bottom of the frame, turn off interrupt-driven I/O, etc. */
1326
1327 void
1328 reset_sys_modes (struct tty_display_info *tty_out)
1329 {
1330 if (noninteractive)
1331 {
1332 fflush (stdout);
1333 return;
1334 }
1335 if (!tty_out->term_initted)
1336 return;
1337
1338 if (!tty_out->output)
1339 return; /* The tty is suspended. */
1340
1341 /* Go to and clear the last line of the terminal. */
1342
1343 cmgoto (tty_out, FrameRows (tty_out) - 1, 0);
1344
1345 /* Code adapted from tty_clear_end_of_line. */
1346 if (tty_out->TS_clr_line)
1347 {
1348 emacs_tputs (tty_out, tty_out->TS_clr_line, 1, cmputc);
1349 }
1350 else
1351 { /* have to do it the hard way */
1352 int i;
1353 tty_turn_off_insert (tty_out);
1354
1355 for (i = cursorX (tty_out); i < FrameCols (tty_out) - 1; i++)
1356 {
1357 fputc (' ', tty_out->output);
1358 }
1359 }
1360
1361 cmgoto (tty_out, FrameRows (tty_out) - 1, 0);
1362 fflush (tty_out->output);
1363
1364 if (tty_out->terminal->reset_terminal_modes_hook)
1365 tty_out->terminal->reset_terminal_modes_hook (tty_out->terminal);
1366
1367 /* Avoid possible loss of output when changing terminal modes. */
1368 while (fdatasync (fileno (tty_out->output)) != 0 && errno == EINTR)
1369 continue;
1370
1371 #ifndef DOS_NT
1372 #ifdef F_SETOWN
1373 if (interrupt_input)
1374 {
1375 reset_sigio (fileno (tty_out->input));
1376 fcntl (fileno (tty_out->input), F_SETOWN,
1377 old_fcntl_owner[fileno (tty_out->input)]);
1378 }
1379 #endif /* F_SETOWN */
1380 fcntl (fileno (tty_out->input), F_SETFL,
1381 fcntl (fileno (tty_out->input), F_GETFL, 0) & ~O_NONBLOCK);
1382 #endif
1383
1384 if (tty_out->old_tty)
1385 while (emacs_set_tty (fileno (tty_out->input),
1386 tty_out->old_tty, 0) < 0 && errno == EINTR)
1387 ;
1388
1389 #ifdef MSDOS /* Demacs 1.1.2 91/10/20 Manabu Higashida */
1390 dos_ttcooked ();
1391 #endif
1392
1393 widen_foreground_group (fileno (tty_out->input));
1394 }
1395 \f
1396 #ifdef HAVE_PTYS
1397
1398 /* Set up the proper status flags for use of a pty. */
1399
1400 void
1401 setup_pty (int fd)
1402 {
1403 /* I'm told that TOICREMOTE does not mean control chars
1404 "can't be sent" but rather that they don't have
1405 input-editing or signaling effects.
1406 That should be good, because we have other ways
1407 to do those things in Emacs.
1408 However, telnet mode seems not to work on 4.2.
1409 So TIOCREMOTE is turned off now. */
1410
1411 /* Under hp-ux, if TIOCREMOTE is turned on, some calls
1412 will hang. In particular, the "timeout" feature (which
1413 causes a read to return if there is no data available)
1414 does this. Also it is known that telnet mode will hang
1415 in such a way that Emacs must be stopped (perhaps this
1416 is the same problem).
1417
1418 If TIOCREMOTE is turned off, then there is a bug in
1419 hp-ux which sometimes loses data. Apparently the
1420 code which blocks the master process when the internal
1421 buffer fills up does not work. Other than this,
1422 though, everything else seems to work fine.
1423
1424 Since the latter lossage is more benign, we may as well
1425 lose that way. -- cph */
1426 #ifdef FIONBIO
1427 #if defined (UNIX98_PTYS)
1428 {
1429 int on = 1;
1430 ioctl (fd, FIONBIO, &on);
1431 }
1432 #endif
1433 #endif
1434 }
1435 #endif /* HAVE_PTYS */
1436 \f
1437 void
1438 init_system_name (void)
1439 {
1440 if (!build_details)
1441 {
1442 /* Set system-name to nil so that the build is deterministic. */
1443 Vsystem_name = Qnil;
1444 return;
1445 }
1446 char *hostname_alloc = NULL;
1447 char *hostname;
1448 #ifndef HAVE_GETHOSTNAME
1449 struct utsname uts;
1450 uname (&uts);
1451 hostname = uts.nodename;
1452 #else /* HAVE_GETHOSTNAME */
1453 char hostname_buf[256];
1454 ptrdiff_t hostname_size = sizeof hostname_buf;
1455 hostname = hostname_buf;
1456
1457 /* Try to get the host name; if the buffer is too short, try
1458 again. Apparently, the only indication gethostname gives of
1459 whether the buffer was large enough is the presence or absence
1460 of a '\0' in the string. Eech. */
1461 for (;;)
1462 {
1463 gethostname (hostname, hostname_size - 1);
1464 hostname[hostname_size - 1] = '\0';
1465
1466 /* Was the buffer large enough for the '\0'? */
1467 if (strlen (hostname) < hostname_size - 1)
1468 break;
1469
1470 hostname = hostname_alloc = xpalloc (hostname_alloc, &hostname_size, 1,
1471 min (PTRDIFF_MAX, SIZE_MAX), 1);
1472 }
1473 #endif /* HAVE_GETHOSTNAME */
1474 char *p;
1475 for (p = hostname; *p; p++)
1476 if (*p == ' ' || *p == '\t')
1477 *p = '-';
1478 if (! (STRINGP (Vsystem_name) && SBYTES (Vsystem_name) == p - hostname
1479 && strcmp (SSDATA (Vsystem_name), hostname) == 0))
1480 Vsystem_name = build_string (hostname);
1481 xfree (hostname_alloc);
1482 }
1483 \f
1484 sigset_t empty_mask;
1485
1486 static struct sigaction process_fatal_action;
1487
1488 static int
1489 emacs_sigaction_flags (void)
1490 {
1491 #ifdef SA_RESTART
1492 /* SA_RESTART causes interruptible functions with timeouts (e.g.,
1493 'select') to reset their timeout on some platforms (e.g.,
1494 HP-UX 11), which is not what we want. Also, when Emacs is
1495 interactive, we don't want SA_RESTART because we need to poll
1496 for pending input so we need long-running syscalls to be interrupted
1497 after a signal that sets pending_signals.
1498
1499 Non-interactive keyboard input goes through stdio, where we
1500 always want restartable system calls. */
1501 if (noninteractive)
1502 return SA_RESTART;
1503 #endif
1504 return 0;
1505 }
1506
1507 /* Store into *ACTION a signal action suitable for Emacs, with handler
1508 HANDLER. */
1509 void
1510 emacs_sigaction_init (struct sigaction *action, signal_handler_t handler)
1511 {
1512 sigemptyset (&action->sa_mask);
1513
1514 /* When handling a signal, block nonfatal system signals that are caught
1515 by Emacs. This makes race conditions less likely. */
1516 sigaddset (&action->sa_mask, SIGALRM);
1517 #ifdef SIGCHLD
1518 sigaddset (&action->sa_mask, SIGCHLD);
1519 #endif
1520 #ifdef SIGDANGER
1521 sigaddset (&action->sa_mask, SIGDANGER);
1522 #endif
1523 #ifdef PROFILER_CPU_SUPPORT
1524 sigaddset (&action->sa_mask, SIGPROF);
1525 #endif
1526 #ifdef SIGWINCH
1527 sigaddset (&action->sa_mask, SIGWINCH);
1528 #endif
1529 if (! noninteractive)
1530 {
1531 sigaddset (&action->sa_mask, SIGINT);
1532 sigaddset (&action->sa_mask, SIGQUIT);
1533 #ifdef USABLE_SIGIO
1534 sigaddset (&action->sa_mask, SIGIO);
1535 #endif
1536 }
1537
1538 action->sa_handler = handler;
1539 action->sa_flags = emacs_sigaction_flags ();
1540 }
1541
1542 #ifdef FORWARD_SIGNAL_TO_MAIN_THREAD
1543 static pthread_t main_thread;
1544 #endif
1545
1546 /* SIG has arrived at the current process. Deliver it to the main
1547 thread, which should handle it with HANDLER.
1548
1549 If we are on the main thread, handle the signal SIG with HANDLER.
1550 Otherwise, redirect the signal to the main thread, blocking it from
1551 this thread. POSIX says any thread can receive a signal that is
1552 associated with a process, process group, or asynchronous event.
1553 On GNU/Linux that is not true, but for other systems (FreeBSD at
1554 least) it is. */
1555 void
1556 deliver_process_signal (int sig, signal_handler_t handler)
1557 {
1558 /* Preserve errno, to avoid race conditions with signal handlers that
1559 might change errno. Races can occur even in single-threaded hosts. */
1560 int old_errno = errno;
1561
1562 bool on_main_thread = true;
1563 #ifdef FORWARD_SIGNAL_TO_MAIN_THREAD
1564 if (! pthread_equal (pthread_self (), main_thread))
1565 {
1566 sigset_t blocked;
1567 sigemptyset (&blocked);
1568 sigaddset (&blocked, sig);
1569 pthread_sigmask (SIG_BLOCK, &blocked, 0);
1570 pthread_kill (main_thread, sig);
1571 on_main_thread = false;
1572 }
1573 #endif
1574 if (on_main_thread)
1575 handler (sig);
1576
1577 errno = old_errno;
1578 }
1579
1580 /* Static location to save a fatal backtrace in a thread.
1581 FIXME: If two subsidiary threads fail simultaneously, the resulting
1582 backtrace may be garbage. */
1583 enum { BACKTRACE_LIMIT_MAX = 500 };
1584 static void *thread_backtrace_buffer[BACKTRACE_LIMIT_MAX + 1];
1585 static int thread_backtrace_npointers;
1586
1587 /* SIG has arrived at the current thread.
1588 If we are on the main thread, handle the signal SIG with HANDLER.
1589 Otherwise, this is a fatal error in the handling thread. */
1590 static void
1591 deliver_thread_signal (int sig, signal_handler_t handler)
1592 {
1593 int old_errno = errno;
1594
1595 #ifdef FORWARD_SIGNAL_TO_MAIN_THREAD
1596 if (! pthread_equal (pthread_self (), main_thread))
1597 {
1598 thread_backtrace_npointers
1599 = backtrace (thread_backtrace_buffer, BACKTRACE_LIMIT_MAX);
1600 sigaction (sig, &process_fatal_action, 0);
1601 pthread_kill (main_thread, sig);
1602
1603 /* Avoid further damage while the main thread is exiting. */
1604 while (1)
1605 sigsuspend (&empty_mask);
1606 }
1607 #endif
1608
1609 handler (sig);
1610 errno = old_errno;
1611 }
1612 \f
1613 #if !HAVE_DECL_SYS_SIGLIST
1614 # undef sys_siglist
1615 # ifdef _sys_siglist
1616 # define sys_siglist _sys_siglist
1617 # elif HAVE_DECL___SYS_SIGLIST
1618 # define sys_siglist __sys_siglist
1619 # else
1620 # define sys_siglist my_sys_siglist
1621 static char const *sys_siglist[NSIG];
1622 # endif
1623 #endif
1624
1625 #ifdef _sys_nsig
1626 # define sys_siglist_entries _sys_nsig
1627 #else
1628 # define sys_siglist_entries NSIG
1629 #endif
1630
1631 /* Handle bus errors, invalid instruction, etc. */
1632 static void
1633 handle_fatal_signal (int sig)
1634 {
1635 terminate_due_to_signal (sig, 40);
1636 }
1637
1638 static void
1639 deliver_fatal_signal (int sig)
1640 {
1641 deliver_process_signal (sig, handle_fatal_signal);
1642 }
1643
1644 static void
1645 deliver_fatal_thread_signal (int sig)
1646 {
1647 deliver_thread_signal (sig, handle_fatal_signal);
1648 }
1649
1650 static _Noreturn void
1651 handle_arith_signal (int sig)
1652 {
1653 pthread_sigmask (SIG_SETMASK, &empty_mask, 0);
1654 xsignal0 (Qarith_error);
1655 }
1656
1657 #if defined HAVE_STACK_OVERFLOW_HANDLING && !defined WINDOWSNT
1658
1659 /* Alternate stack used by SIGSEGV handler below. */
1660
1661 static unsigned char sigsegv_stack[SIGSTKSZ];
1662
1663
1664 /* Return true if SIGINFO indicates a stack overflow. */
1665
1666 static bool
1667 stack_overflow (siginfo_t *siginfo)
1668 {
1669 if (!attempt_stack_overflow_recovery)
1670 return false;
1671
1672 /* In theory, a more-accurate heuristic can be obtained by using
1673 GNU/Linux pthread_getattr_np along with POSIX pthread_attr_getstack
1674 and pthread_attr_getguardsize to find the location and size of the
1675 guard area. In practice, though, these functions are so hard to
1676 use reliably that they're not worth bothering with. E.g., see:
1677 https://sourceware.org/bugzilla/show_bug.cgi?id=16291
1678 Other operating systems also have problems, e.g., Solaris's
1679 stack_violation function is tailor-made for this problem, but it
1680 doesn't work on Solaris 11.2 x86-64 with a 32-bit executable.
1681
1682 GNU libsigsegv is overkill for Emacs; otherwise it might be a
1683 candidate here. */
1684
1685 if (!siginfo)
1686 return false;
1687
1688 /* The faulting address. */
1689 char *addr = siginfo->si_addr;
1690 if (!addr)
1691 return false;
1692
1693 /* The known top and bottom of the stack. The actual stack may
1694 extend a bit beyond these boundaries. */
1695 char *bot = stack_bottom;
1696 char *top = near_C_stack_top ();
1697
1698 /* Log base 2 of the stack heuristic ratio. This ratio is the size
1699 of the known stack divided by the size of the guard area past the
1700 end of the stack top. The heuristic is that a bad address is
1701 considered to be a stack overflow if it occurs within
1702 stacksize>>LG_STACK_HEURISTIC bytes above the top of the known
1703 stack. This heuristic is not exactly correct but it's good
1704 enough in practice. */
1705 enum { LG_STACK_HEURISTIC = 8 };
1706
1707 if (bot < top)
1708 return 0 <= addr - top && addr - top < (top - bot) >> LG_STACK_HEURISTIC;
1709 else
1710 return 0 <= top - addr && top - addr < (bot - top) >> LG_STACK_HEURISTIC;
1711 }
1712
1713
1714 /* Attempt to recover from SIGSEGV caused by C stack overflow. */
1715
1716 static void
1717 handle_sigsegv (int sig, siginfo_t *siginfo, void *arg)
1718 {
1719 /* Hard GC error may lead to stack overflow caused by
1720 too nested calls to mark_object. No way to survive. */
1721 bool fatal = gc_in_progress;
1722
1723 #ifdef FORWARD_SIGNAL_TO_MAIN_THREAD
1724 if (!fatal && !pthread_equal (pthread_self (), main_thread))
1725 fatal = true;
1726 #endif
1727
1728 if (!fatal && stack_overflow (siginfo))
1729 siglongjmp (return_to_command_loop, 1);
1730
1731 /* Otherwise we can't do anything with this. */
1732 deliver_fatal_thread_signal (sig);
1733 }
1734
1735 /* Return true if we have successfully set up SIGSEGV handler on alternate
1736 stack. Otherwise we just treat SIGSEGV among the rest of fatal signals. */
1737
1738 static bool
1739 init_sigsegv (void)
1740 {
1741 struct sigaction sa;
1742 stack_t ss;
1743
1744 ss.ss_sp = sigsegv_stack;
1745 ss.ss_size = sizeof (sigsegv_stack);
1746 ss.ss_flags = 0;
1747 if (sigaltstack (&ss, NULL) < 0)
1748 return 0;
1749
1750 sigfillset (&sa.sa_mask);
1751 sa.sa_sigaction = handle_sigsegv;
1752 sa.sa_flags = SA_SIGINFO | SA_ONSTACK | emacs_sigaction_flags ();
1753 return sigaction (SIGSEGV, &sa, NULL) < 0 ? 0 : 1;
1754 }
1755
1756 #else /* not HAVE_STACK_OVERFLOW_HANDLING or WINDOWSNT */
1757
1758 static bool
1759 init_sigsegv (void)
1760 {
1761 return 0;
1762 }
1763
1764 #endif /* HAVE_STACK_OVERFLOW_HANDLING && !WINDOWSNT */
1765
1766 static void
1767 deliver_arith_signal (int sig)
1768 {
1769 deliver_thread_signal (sig, handle_arith_signal);
1770 }
1771
1772 #ifdef SIGDANGER
1773
1774 /* Handler for SIGDANGER. */
1775 static void
1776 handle_danger_signal (int sig)
1777 {
1778 malloc_warning ("Operating system warns that virtual memory is running low.\n");
1779
1780 /* It might be unsafe to call do_auto_save now. */
1781 force_auto_save_soon ();
1782 }
1783
1784 static void
1785 deliver_danger_signal (int sig)
1786 {
1787 deliver_process_signal (sig, handle_danger_signal);
1788 }
1789 #endif
1790
1791 /* Treat SIG as a terminating signal, unless it is already ignored and
1792 we are in --batch mode. Among other things, this makes nohup work. */
1793 static void
1794 maybe_fatal_sig (int sig)
1795 {
1796 bool catch_sig = !noninteractive;
1797 if (!catch_sig)
1798 {
1799 struct sigaction old_action;
1800 sigaction (sig, 0, &old_action);
1801 catch_sig = old_action.sa_handler != SIG_IGN;
1802 }
1803 if (catch_sig)
1804 sigaction (sig, &process_fatal_action, 0);
1805 }
1806
1807 void
1808 init_signals (bool dumping)
1809 {
1810 struct sigaction thread_fatal_action;
1811 struct sigaction action;
1812
1813 sigemptyset (&empty_mask);
1814
1815 #ifdef FORWARD_SIGNAL_TO_MAIN_THREAD
1816 main_thread = pthread_self ();
1817 #endif
1818
1819 #if !HAVE_DECL_SYS_SIGLIST && !defined _sys_siglist
1820 if (! initialized)
1821 {
1822 sys_siglist[SIGABRT] = "Aborted";
1823 # ifdef SIGAIO
1824 sys_siglist[SIGAIO] = "LAN I/O interrupt";
1825 # endif
1826 sys_siglist[SIGALRM] = "Alarm clock";
1827 # ifdef SIGBUS
1828 sys_siglist[SIGBUS] = "Bus error";
1829 # endif
1830 # ifdef SIGCHLD
1831 sys_siglist[SIGCHLD] = "Child status changed";
1832 # endif
1833 # ifdef SIGCONT
1834 sys_siglist[SIGCONT] = "Continued";
1835 # endif
1836 # ifdef SIGDANGER
1837 sys_siglist[SIGDANGER] = "Swap space dangerously low";
1838 # endif
1839 # ifdef SIGDGNOTIFY
1840 sys_siglist[SIGDGNOTIFY] = "Notification message in queue";
1841 # endif
1842 # ifdef SIGEMT
1843 sys_siglist[SIGEMT] = "Emulation trap";
1844 # endif
1845 sys_siglist[SIGFPE] = "Arithmetic exception";
1846 # ifdef SIGFREEZE
1847 sys_siglist[SIGFREEZE] = "SIGFREEZE";
1848 # endif
1849 # ifdef SIGGRANT
1850 sys_siglist[SIGGRANT] = "Monitor mode granted";
1851 # endif
1852 sys_siglist[SIGHUP] = "Hangup";
1853 sys_siglist[SIGILL] = "Illegal instruction";
1854 sys_siglist[SIGINT] = "Interrupt";
1855 # ifdef SIGIO
1856 sys_siglist[SIGIO] = "I/O possible";
1857 # endif
1858 # ifdef SIGIOINT
1859 sys_siglist[SIGIOINT] = "I/O intervention required";
1860 # endif
1861 # ifdef SIGIOT
1862 sys_siglist[SIGIOT] = "IOT trap";
1863 # endif
1864 sys_siglist[SIGKILL] = "Killed";
1865 # ifdef SIGLOST
1866 sys_siglist[SIGLOST] = "Resource lost";
1867 # endif
1868 # ifdef SIGLWP
1869 sys_siglist[SIGLWP] = "SIGLWP";
1870 # endif
1871 # ifdef SIGMSG
1872 sys_siglist[SIGMSG] = "Monitor mode data available";
1873 # endif
1874 # ifdef SIGPHONE
1875 sys_siglist[SIGWIND] = "SIGPHONE";
1876 # endif
1877 sys_siglist[SIGPIPE] = "Broken pipe";
1878 # ifdef SIGPOLL
1879 sys_siglist[SIGPOLL] = "Pollable event occurred";
1880 # endif
1881 # ifdef SIGPROF
1882 sys_siglist[SIGPROF] = "Profiling timer expired";
1883 # endif
1884 # ifdef SIGPTY
1885 sys_siglist[SIGPTY] = "PTY I/O interrupt";
1886 # endif
1887 # ifdef SIGPWR
1888 sys_siglist[SIGPWR] = "Power-fail restart";
1889 # endif
1890 sys_siglist[SIGQUIT] = "Quit";
1891 # ifdef SIGRETRACT
1892 sys_siglist[SIGRETRACT] = "Need to relinquish monitor mode";
1893 # endif
1894 # ifdef SIGSAK
1895 sys_siglist[SIGSAK] = "Secure attention";
1896 # endif
1897 sys_siglist[SIGSEGV] = "Segmentation violation";
1898 # ifdef SIGSOUND
1899 sys_siglist[SIGSOUND] = "Sound completed";
1900 # endif
1901 # ifdef SIGSTOP
1902 sys_siglist[SIGSTOP] = "Stopped (signal)";
1903 # endif
1904 # ifdef SIGSTP
1905 sys_siglist[SIGSTP] = "Stopped (user)";
1906 # endif
1907 # ifdef SIGSYS
1908 sys_siglist[SIGSYS] = "Bad argument to system call";
1909 # endif
1910 sys_siglist[SIGTERM] = "Terminated";
1911 # ifdef SIGTHAW
1912 sys_siglist[SIGTHAW] = "SIGTHAW";
1913 # endif
1914 # ifdef SIGTRAP
1915 sys_siglist[SIGTRAP] = "Trace/breakpoint trap";
1916 # endif
1917 # ifdef SIGTSTP
1918 sys_siglist[SIGTSTP] = "Stopped (user)";
1919 # endif
1920 # ifdef SIGTTIN
1921 sys_siglist[SIGTTIN] = "Stopped (tty input)";
1922 # endif
1923 # ifdef SIGTTOU
1924 sys_siglist[SIGTTOU] = "Stopped (tty output)";
1925 # endif
1926 # ifdef SIGURG
1927 sys_siglist[SIGURG] = "Urgent I/O condition";
1928 # endif
1929 # ifdef SIGUSR1
1930 sys_siglist[SIGUSR1] = "User defined signal 1";
1931 # endif
1932 # ifdef SIGUSR2
1933 sys_siglist[SIGUSR2] = "User defined signal 2";
1934 # endif
1935 # ifdef SIGVTALRM
1936 sys_siglist[SIGVTALRM] = "Virtual timer expired";
1937 # endif
1938 # ifdef SIGWAITING
1939 sys_siglist[SIGWAITING] = "Process's LWPs are blocked";
1940 # endif
1941 # ifdef SIGWINCH
1942 sys_siglist[SIGWINCH] = "Window size changed";
1943 # endif
1944 # ifdef SIGWIND
1945 sys_siglist[SIGWIND] = "SIGWIND";
1946 # endif
1947 # ifdef SIGXCPU
1948 sys_siglist[SIGXCPU] = "CPU time limit exceeded";
1949 # endif
1950 # ifdef SIGXFSZ
1951 sys_siglist[SIGXFSZ] = "File size limit exceeded";
1952 # endif
1953 }
1954 #endif /* !HAVE_DECL_SYS_SIGLIST && !_sys_siglist */
1955
1956 /* Don't alter signal handlers if dumping. On some machines,
1957 changing signal handlers sets static data that would make signals
1958 fail to work right when the dumped Emacs is run. */
1959 if (dumping)
1960 return;
1961
1962 sigfillset (&process_fatal_action.sa_mask);
1963 process_fatal_action.sa_handler = deliver_fatal_signal;
1964 process_fatal_action.sa_flags = emacs_sigaction_flags ();
1965
1966 sigfillset (&thread_fatal_action.sa_mask);
1967 thread_fatal_action.sa_handler = deliver_fatal_thread_signal;
1968 thread_fatal_action.sa_flags = process_fatal_action.sa_flags;
1969
1970 /* SIGINT may need special treatment on MS-Windows. See
1971 http://lists.gnu.org/archive/html/emacs-devel/2010-09/msg01062.html
1972 Please update the doc of kill-emacs, kill-emacs-hook, and
1973 NEWS if you change this. */
1974
1975 maybe_fatal_sig (SIGHUP);
1976 maybe_fatal_sig (SIGINT);
1977 maybe_fatal_sig (SIGTERM);
1978
1979 /* Emacs checks for write errors, so it can safely ignore SIGPIPE.
1980 However, in batch mode leave SIGPIPE alone, as that causes Emacs
1981 to behave more like typical batch applications do. */
1982 if (! noninteractive)
1983 signal (SIGPIPE, SIG_IGN);
1984
1985 sigaction (SIGQUIT, &process_fatal_action, 0);
1986 sigaction (SIGILL, &thread_fatal_action, 0);
1987 sigaction (SIGTRAP, &thread_fatal_action, 0);
1988
1989 /* Typically SIGFPE is thread-specific and is fatal, like SIGILL.
1990 But on a non-IEEE host SIGFPE can come from a trap in the Lisp
1991 interpreter's floating point operations, so treat SIGFPE as an
1992 arith-error if it arises in the main thread. */
1993 if (IEEE_FLOATING_POINT)
1994 sigaction (SIGFPE, &thread_fatal_action, 0);
1995 else
1996 {
1997 emacs_sigaction_init (&action, deliver_arith_signal);
1998 sigaction (SIGFPE, &action, 0);
1999 }
2000
2001 #ifdef SIGUSR1
2002 add_user_signal (SIGUSR1, "sigusr1");
2003 #endif
2004 #ifdef SIGUSR2
2005 add_user_signal (SIGUSR2, "sigusr2");
2006 #endif
2007 sigaction (SIGABRT, &thread_fatal_action, 0);
2008 #ifdef SIGPRE
2009 sigaction (SIGPRE, &thread_fatal_action, 0);
2010 #endif
2011 #ifdef SIGORE
2012 sigaction (SIGORE, &thread_fatal_action, 0);
2013 #endif
2014 #ifdef SIGUME
2015 sigaction (SIGUME, &thread_fatal_action, 0);
2016 #endif
2017 #ifdef SIGDLK
2018 sigaction (SIGDLK, &process_fatal_action, 0);
2019 #endif
2020 #ifdef SIGCPULIM
2021 sigaction (SIGCPULIM, &process_fatal_action, 0);
2022 #endif
2023 #ifdef SIGIOT
2024 sigaction (SIGIOT, &thread_fatal_action, 0);
2025 #endif
2026 #ifdef SIGEMT
2027 sigaction (SIGEMT, &thread_fatal_action, 0);
2028 #endif
2029 #ifdef SIGBUS
2030 sigaction (SIGBUS, &thread_fatal_action, 0);
2031 #endif
2032 if (!init_sigsegv ())
2033 sigaction (SIGSEGV, &thread_fatal_action, 0);
2034 #ifdef SIGSYS
2035 sigaction (SIGSYS, &thread_fatal_action, 0);
2036 #endif
2037 sigaction (SIGTERM, &process_fatal_action, 0);
2038 #ifdef SIGPROF
2039 signal (SIGPROF, SIG_IGN);
2040 #endif
2041 #ifdef SIGVTALRM
2042 sigaction (SIGVTALRM, &process_fatal_action, 0);
2043 #endif
2044 #ifdef SIGXCPU
2045 sigaction (SIGXCPU, &process_fatal_action, 0);
2046 #endif
2047 #ifdef SIGXFSZ
2048 sigaction (SIGXFSZ, &process_fatal_action, 0);
2049 #endif
2050
2051 #ifdef SIGDANGER
2052 /* This just means available memory is getting low. */
2053 emacs_sigaction_init (&action, deliver_danger_signal);
2054 sigaction (SIGDANGER, &action, 0);
2055 #endif
2056
2057 /* AIX-specific signals. */
2058 #ifdef SIGGRANT
2059 sigaction (SIGGRANT, &process_fatal_action, 0);
2060 #endif
2061 #ifdef SIGMIGRATE
2062 sigaction (SIGMIGRATE, &process_fatal_action, 0);
2063 #endif
2064 #ifdef SIGMSG
2065 sigaction (SIGMSG, &process_fatal_action, 0);
2066 #endif
2067 #ifdef SIGRETRACT
2068 sigaction (SIGRETRACT, &process_fatal_action, 0);
2069 #endif
2070 #ifdef SIGSAK
2071 sigaction (SIGSAK, &process_fatal_action, 0);
2072 #endif
2073 #ifdef SIGSOUND
2074 sigaction (SIGSOUND, &process_fatal_action, 0);
2075 #endif
2076 #ifdef SIGTALRM
2077 sigaction (SIGTALRM, &thread_fatal_action, 0);
2078 #endif
2079 }
2080 \f
2081 #ifndef HAVE_RANDOM
2082 #ifdef random
2083 #define HAVE_RANDOM
2084 #endif
2085 #endif
2086
2087 /* Figure out how many bits the system's random number generator uses.
2088 `random' and `lrand48' are assumed to return 31 usable bits.
2089 BSD `rand' returns a 31 bit value but the low order bits are unusable;
2090 so we'll shift it and treat it like the 15-bit USG `rand'. */
2091
2092 #ifndef RAND_BITS
2093 # ifdef HAVE_RANDOM
2094 # define RAND_BITS 31
2095 # else /* !HAVE_RANDOM */
2096 # ifdef HAVE_LRAND48
2097 # define RAND_BITS 31
2098 # define random lrand48
2099 # else /* !HAVE_LRAND48 */
2100 # define RAND_BITS 15
2101 # if RAND_MAX == 32767
2102 # define random rand
2103 # else /* RAND_MAX != 32767 */
2104 # if RAND_MAX == 2147483647
2105 # define random() (rand () >> 16)
2106 # else /* RAND_MAX != 2147483647 */
2107 # ifdef USG
2108 # define random rand
2109 # else
2110 # define random() (rand () >> 16)
2111 # endif /* !USG */
2112 # endif /* RAND_MAX != 2147483647 */
2113 # endif /* RAND_MAX != 32767 */
2114 # endif /* !HAVE_LRAND48 */
2115 # endif /* !HAVE_RANDOM */
2116 #endif /* !RAND_BITS */
2117
2118 #ifdef HAVE_RANDOM
2119 typedef unsigned int random_seed;
2120 static void set_random_seed (random_seed arg) { srandom (arg); }
2121 #elif defined HAVE_LRAND48
2122 /* Although srand48 uses a long seed, this is unsigned long to avoid
2123 undefined behavior on signed integer overflow in init_random. */
2124 typedef unsigned long int random_seed;
2125 static void set_random_seed (random_seed arg) { srand48 (arg); }
2126 #else
2127 typedef unsigned int random_seed;
2128 static void set_random_seed (random_seed arg) { srand (arg); }
2129 #endif
2130
2131 void
2132 seed_random (void *seed, ptrdiff_t seed_size)
2133 {
2134 random_seed arg = 0;
2135 unsigned char *argp = (unsigned char *) &arg;
2136 unsigned char *seedp = seed;
2137 for (ptrdiff_t i = 0; i < seed_size; i++)
2138 argp[i % sizeof arg] ^= seedp[i];
2139 set_random_seed (arg);
2140 }
2141
2142 void
2143 init_random (void)
2144 {
2145 random_seed v;
2146 if (! (EQ (emacs_gnutls_global_init (), Qt)
2147 && gnutls_rnd (GNUTLS_RND_NONCE, &v, sizeof v) == 0))
2148 {
2149 bool success = false;
2150 #ifndef WINDOWSNT
2151 int fd = emacs_open ("/dev/urandom", O_RDONLY | O_BINARY, 0);
2152 if (0 <= fd)
2153 {
2154 success = emacs_read (fd, &v, sizeof v) == sizeof v;
2155 emacs_close (fd);
2156 }
2157 #else
2158 success = w32_init_random (&v, sizeof v) == 0;
2159 #endif
2160 if (! success)
2161 {
2162 /* Fall back to current time value + PID. */
2163 struct timespec t = current_timespec ();
2164 v = getpid () ^ t.tv_sec ^ t.tv_nsec;
2165 }
2166 }
2167 set_random_seed (v);
2168 }
2169
2170 /*
2171 * Return a nonnegative random integer out of whatever we've got.
2172 * It contains enough bits to make a random (signed) Emacs fixnum.
2173 * This suffices even for a 64-bit architecture with a 15-bit rand.
2174 */
2175 EMACS_INT
2176 get_random (void)
2177 {
2178 EMACS_UINT val = 0;
2179 int i;
2180 for (i = 0; i < (FIXNUM_BITS + RAND_BITS - 1) / RAND_BITS; i++)
2181 val = (random () ^ (val << RAND_BITS)
2182 ^ (val >> (BITS_PER_EMACS_INT - RAND_BITS)));
2183 val ^= val >> (BITS_PER_EMACS_INT - FIXNUM_BITS);
2184 return val & INTMASK;
2185 }
2186
2187 #ifndef HAVE_SNPRINTF
2188 /* Approximate snprintf as best we can on ancient hosts that lack it. */
2189 int
2190 snprintf (char *buf, size_t bufsize, char const *format, ...)
2191 {
2192 ptrdiff_t size = min (bufsize, PTRDIFF_MAX);
2193 ptrdiff_t nbytes = size - 1;
2194 va_list ap;
2195
2196 if (size)
2197 {
2198 va_start (ap, format);
2199 nbytes = doprnt (buf, size, format, 0, ap);
2200 va_end (ap);
2201 }
2202
2203 if (nbytes == size - 1)
2204 {
2205 /* Calculate the length of the string that would have been created
2206 had the buffer been large enough. */
2207 char stackbuf[4000];
2208 char *b = stackbuf;
2209 ptrdiff_t bsize = sizeof stackbuf;
2210 va_start (ap, format);
2211 nbytes = evxprintf (&b, &bsize, stackbuf, -1, format, ap);
2212 va_end (ap);
2213 if (b != stackbuf)
2214 xfree (b);
2215 }
2216
2217 if (INT_MAX < nbytes)
2218 {
2219 #ifdef EOVERFLOW
2220 errno = EOVERFLOW;
2221 #else
2222 errno = EDOM;
2223 #endif
2224 return -1;
2225 }
2226 return nbytes;
2227 }
2228 #endif
2229 \f
2230 /* If a backtrace is available, output the top lines of it to stderr.
2231 Do not output more than BACKTRACE_LIMIT or BACKTRACE_LIMIT_MAX lines.
2232 This function may be called from a signal handler, so it should
2233 not invoke async-unsafe functions like malloc.
2234
2235 If BACKTRACE_LIMIT is -1, initialize tables that 'backtrace' uses
2236 but do not output anything. This avoids some problems that can
2237 otherwise occur if the malloc arena is corrupted before 'backtrace'
2238 is called, since 'backtrace' may call malloc if the tables are not
2239 initialized.
2240
2241 If the static variable THREAD_BACKTRACE_NPOINTERS is nonzero, a
2242 fatal error has occurred in some other thread; generate a thread
2243 backtrace instead, ignoring BACKTRACE_LIMIT. */
2244 void
2245 emacs_backtrace (int backtrace_limit)
2246 {
2247 void *main_backtrace_buffer[BACKTRACE_LIMIT_MAX + 1];
2248 int bounded_limit = min (backtrace_limit, BACKTRACE_LIMIT_MAX);
2249 void *buffer;
2250 int npointers;
2251
2252 if (thread_backtrace_npointers)
2253 {
2254 buffer = thread_backtrace_buffer;
2255 npointers = thread_backtrace_npointers;
2256 }
2257 else
2258 {
2259 buffer = main_backtrace_buffer;
2260
2261 /* Work around 'backtrace' bug; see Bug#19959 and glibc bug#18084. */
2262 if (bounded_limit < 0)
2263 {
2264 backtrace (buffer, 1);
2265 return;
2266 }
2267
2268 npointers = backtrace (buffer, bounded_limit + 1);
2269 }
2270
2271 if (npointers)
2272 {
2273 emacs_write (STDERR_FILENO, "\nBacktrace:\n", 12);
2274 backtrace_symbols_fd (buffer, npointers, STDERR_FILENO);
2275 if (bounded_limit < npointers)
2276 emacs_write (STDERR_FILENO, "...\n", 4);
2277 }
2278 }
2279 \f
2280 #ifndef HAVE_NTGUI
2281 void
2282 emacs_abort (void)
2283 {
2284 terminate_due_to_signal (SIGABRT, 40);
2285 }
2286 #endif
2287
2288 /* Open FILE for Emacs use, using open flags OFLAG and mode MODE.
2289 Use binary I/O on systems that care about text vs binary I/O.
2290 Arrange for subprograms to not inherit the file descriptor.
2291 Prefer a method that is multithread-safe, if available.
2292 Do not fail merely because the open was interrupted by a signal.
2293 Allow the user to quit. */
2294
2295 int
2296 emacs_open (const char *file, int oflags, int mode)
2297 {
2298 int fd;
2299 if (! (oflags & O_TEXT))
2300 oflags |= O_BINARY;
2301 oflags |= O_CLOEXEC;
2302 while ((fd = open (file, oflags, mode)) < 0 && errno == EINTR)
2303 QUIT;
2304 if (! O_CLOEXEC && 0 <= fd)
2305 fcntl (fd, F_SETFD, FD_CLOEXEC);
2306 return fd;
2307 }
2308
2309 /* Open FILE as a stream for Emacs use, with mode MODE.
2310 Act like emacs_open with respect to threads, signals, and quits. */
2311
2312 FILE *
2313 emacs_fopen (char const *file, char const *mode)
2314 {
2315 int fd, omode, oflags;
2316 int bflag = 0;
2317 char const *m = mode;
2318
2319 switch (*m++)
2320 {
2321 case 'r': omode = O_RDONLY; oflags = 0; break;
2322 case 'w': omode = O_WRONLY; oflags = O_CREAT | O_TRUNC; break;
2323 case 'a': omode = O_WRONLY; oflags = O_CREAT | O_APPEND; break;
2324 default: emacs_abort ();
2325 }
2326
2327 while (*m)
2328 switch (*m++)
2329 {
2330 case '+': omode = O_RDWR; break;
2331 case 'b': bflag = O_BINARY; break;
2332 case 't': bflag = O_TEXT; break;
2333 default: /* Ignore. */ break;
2334 }
2335
2336 fd = emacs_open (file, omode | oflags | bflag, 0666);
2337 return fd < 0 ? 0 : fdopen (fd, mode);
2338 }
2339
2340 /* Create a pipe for Emacs use. */
2341
2342 int
2343 emacs_pipe (int fd[2])
2344 {
2345 #ifdef MSDOS
2346 return pipe (fd);
2347 #else /* !MSDOS */
2348 int result = pipe2 (fd, O_BINARY | O_CLOEXEC);
2349 if (! O_CLOEXEC && result == 0)
2350 {
2351 fcntl (fd[0], F_SETFD, FD_CLOEXEC);
2352 fcntl (fd[1], F_SETFD, FD_CLOEXEC);
2353 }
2354 return result;
2355 #endif /* !MSDOS */
2356 }
2357
2358 /* Approximate posix_close and POSIX_CLOSE_RESTART well enough for Emacs.
2359 For the background behind this mess, please see Austin Group defect 529
2360 <http://austingroupbugs.net/view.php?id=529>. */
2361
2362 #ifndef POSIX_CLOSE_RESTART
2363 # define POSIX_CLOSE_RESTART 1
2364 static int
2365 posix_close (int fd, int flag)
2366 {
2367 /* Only the POSIX_CLOSE_RESTART case is emulated. */
2368 eassert (flag == POSIX_CLOSE_RESTART);
2369
2370 /* Things are tricky if close (fd) returns -1 with errno == EINTR
2371 on a system that does not define POSIX_CLOSE_RESTART.
2372
2373 In this case, in some systems (e.g., GNU/Linux, AIX) FD is
2374 closed, and retrying the close could inadvertently close a file
2375 descriptor allocated by some other thread. In other systems
2376 (e.g., HP/UX) FD is not closed. And in still other systems
2377 (e.g., OS X, Solaris), maybe FD is closed, maybe not, and in a
2378 multithreaded program there can be no way to tell.
2379
2380 So, in this case, pretend that the close succeeded. This works
2381 well on systems like GNU/Linux that close FD. Although it may
2382 leak a file descriptor on other systems, the leak is unlikely and
2383 it's better to leak than to close a random victim. */
2384 return close (fd) == 0 || errno == EINTR ? 0 : -1;
2385 }
2386 #endif
2387
2388 /* Close FD, retrying if interrupted. If successful, return 0;
2389 otherwise, return -1 and set errno to a non-EINTR value. Consider
2390 an EINPROGRESS error to be successful, as that's merely a signal
2391 arriving. FD is always closed when this function returns, even
2392 when it returns -1.
2393
2394 Do not call this function if FD is nonnegative and might already be closed,
2395 as that might close an innocent victim opened by some other thread. */
2396
2397 int
2398 emacs_close (int fd)
2399 {
2400 while (1)
2401 {
2402 int r = posix_close (fd, POSIX_CLOSE_RESTART);
2403 if (r == 0)
2404 return r;
2405 if (!POSIX_CLOSE_RESTART || errno != EINTR)
2406 {
2407 eassert (errno != EBADF || fd < 0);
2408 return errno == EINPROGRESS ? 0 : r;
2409 }
2410 }
2411 }
2412
2413 /* Maximum number of bytes to read or write in a single system call.
2414 This works around a serious bug in Linux kernels before 2.6.16; see
2415 <https://bugzilla.redhat.com/show_bug.cgi?format=multiple&id=612839>.
2416 It's likely to work around similar bugs in other operating systems, so do it
2417 on all platforms. Round INT_MAX down to a page size, with the conservative
2418 assumption that page sizes are at most 2**18 bytes (any kernel with a
2419 page size larger than that shouldn't have the bug). */
2420 #ifndef MAX_RW_COUNT
2421 #define MAX_RW_COUNT (INT_MAX >> 18 << 18)
2422 #endif
2423
2424 /* Read from FILEDESC to a buffer BUF with size NBYTE, retrying if interrupted.
2425 Return the number of bytes read, which might be less than NBYTE.
2426 On error, set errno and return -1. */
2427 ptrdiff_t
2428 emacs_read (int fildes, void *buf, ptrdiff_t nbyte)
2429 {
2430 ssize_t rtnval;
2431
2432 /* There is no need to check against MAX_RW_COUNT, since no caller ever
2433 passes a size that large to emacs_read. */
2434
2435 while ((rtnval = read (fildes, buf, nbyte)) == -1
2436 && (errno == EINTR))
2437 QUIT;
2438 return (rtnval);
2439 }
2440
2441 /* Write to FILEDES from a buffer BUF with size NBYTE, retrying if interrupted
2442 or if a partial write occurs. If interrupted, process pending
2443 signals if PROCESS SIGNALS. Return the number of bytes written, setting
2444 errno if this is less than NBYTE. */
2445 static ptrdiff_t
2446 emacs_full_write (int fildes, char const *buf, ptrdiff_t nbyte,
2447 bool process_signals)
2448 {
2449 ptrdiff_t bytes_written = 0;
2450
2451 while (nbyte > 0)
2452 {
2453 ssize_t n = write (fildes, buf, min (nbyte, MAX_RW_COUNT));
2454
2455 if (n < 0)
2456 {
2457 if (errno == EINTR)
2458 {
2459 /* I originally used `QUIT' but that might cause files to
2460 be truncated if you hit C-g in the middle of it. --Stef */
2461 if (process_signals && pending_signals)
2462 process_pending_signals ();
2463 continue;
2464 }
2465 else
2466 break;
2467 }
2468
2469 buf += n;
2470 nbyte -= n;
2471 bytes_written += n;
2472 }
2473
2474 return bytes_written;
2475 }
2476
2477 /* Write to FILEDES from a buffer BUF with size NBYTE, retrying if
2478 interrupted or if a partial write occurs. Return the number of
2479 bytes written, setting errno if this is less than NBYTE. */
2480 ptrdiff_t
2481 emacs_write (int fildes, void const *buf, ptrdiff_t nbyte)
2482 {
2483 return emacs_full_write (fildes, buf, nbyte, 0);
2484 }
2485
2486 /* Like emacs_write, but also process pending signals if interrupted. */
2487 ptrdiff_t
2488 emacs_write_sig (int fildes, void const *buf, ptrdiff_t nbyte)
2489 {
2490 return emacs_full_write (fildes, buf, nbyte, 1);
2491 }
2492
2493 /* Write a diagnostic to standard error that contains MESSAGE and a
2494 string derived from errno. Preserve errno. Do not buffer stderr.
2495 Do not process pending signals if interrupted. */
2496 void
2497 emacs_perror (char const *message)
2498 {
2499 int err = errno;
2500 char const *error_string = strerror (err);
2501 char const *command = (initial_argv && initial_argv[0]
2502 ? initial_argv[0] : "emacs");
2503 /* Write it out all at once, if it's short; this is less likely to
2504 be interleaved with other output. */
2505 char buf[BUFSIZ];
2506 int nbytes = snprintf (buf, sizeof buf, "%s: %s: %s\n",
2507 command, message, error_string);
2508 if (0 <= nbytes && nbytes < BUFSIZ)
2509 emacs_write (STDERR_FILENO, buf, nbytes);
2510 else
2511 {
2512 emacs_write (STDERR_FILENO, command, strlen (command));
2513 emacs_write (STDERR_FILENO, ": ", 2);
2514 emacs_write (STDERR_FILENO, message, strlen (message));
2515 emacs_write (STDERR_FILENO, ": ", 2);
2516 emacs_write (STDERR_FILENO, error_string, strlen (error_string));
2517 emacs_write (STDERR_FILENO, "\n", 1);
2518 }
2519 errno = err;
2520 }
2521 \f
2522 /* Return a struct timeval that is roughly equivalent to T.
2523 Use the least timeval not less than T.
2524 Return an extremal value if the result would overflow. */
2525 struct timeval
2526 make_timeval (struct timespec t)
2527 {
2528 struct timeval tv;
2529 tv.tv_sec = t.tv_sec;
2530 tv.tv_usec = t.tv_nsec / 1000;
2531
2532 if (t.tv_nsec % 1000 != 0)
2533 {
2534 if (tv.tv_usec < 999999)
2535 tv.tv_usec++;
2536 else if (tv.tv_sec < TYPE_MAXIMUM (time_t))
2537 {
2538 tv.tv_sec++;
2539 tv.tv_usec = 0;
2540 }
2541 }
2542
2543 return tv;
2544 }
2545
2546 /* Set the access and modification time stamps of FD (a.k.a. FILE) to be
2547 ATIME and MTIME, respectively.
2548 FD must be either negative -- in which case it is ignored --
2549 or a file descriptor that is open on FILE.
2550 If FD is nonnegative, then FILE can be NULL. */
2551 int
2552 set_file_times (int fd, const char *filename,
2553 struct timespec atime, struct timespec mtime)
2554 {
2555 struct timespec timespec[2];
2556 timespec[0] = atime;
2557 timespec[1] = mtime;
2558 return fdutimens (fd, filename, timespec);
2559 }
2560 \f
2561 /* Like strsignal, except async-signal-safe, and this function typically
2562 returns a string in the C locale rather than the current locale. */
2563 char const *
2564 safe_strsignal (int code)
2565 {
2566 char const *signame = 0;
2567
2568 if (0 <= code && code < sys_siglist_entries)
2569 signame = sys_siglist[code];
2570 if (! signame)
2571 signame = "Unknown signal";
2572
2573 return signame;
2574 }
2575 \f
2576 #ifndef DOS_NT
2577 /* For make-serial-process */
2578 int
2579 serial_open (Lisp_Object port)
2580 {
2581 int fd = emacs_open (SSDATA (port), O_RDWR | O_NOCTTY | O_NONBLOCK, 0);
2582 if (fd < 0)
2583 report_file_error ("Opening serial port", port);
2584 #ifdef TIOCEXCL
2585 ioctl (fd, TIOCEXCL, (char *) 0);
2586 #endif
2587
2588 return fd;
2589 }
2590
2591 #if !defined (HAVE_CFMAKERAW)
2592 /* Workaround for targets which are missing cfmakeraw. */
2593 /* Pasted from man page. */
2594 static void
2595 cfmakeraw (struct termios *termios_p)
2596 {
2597 termios_p->c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON);
2598 termios_p->c_oflag &= ~OPOST;
2599 termios_p->c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);
2600 termios_p->c_cflag &= ~(CSIZE|PARENB);
2601 termios_p->c_cflag |= CS8;
2602 }
2603 #endif /* !defined (HAVE_CFMAKERAW */
2604
2605 #if !defined (HAVE_CFSETSPEED)
2606 /* Workaround for targets which are missing cfsetspeed. */
2607 static int
2608 cfsetspeed (struct termios *termios_p, speed_t vitesse)
2609 {
2610 return (cfsetispeed (termios_p, vitesse)
2611 + cfsetospeed (termios_p, vitesse));
2612 }
2613 #endif
2614
2615 /* For serial-process-configure */
2616 void
2617 serial_configure (struct Lisp_Process *p,
2618 Lisp_Object contact)
2619 {
2620 Lisp_Object childp2 = Qnil;
2621 Lisp_Object tem = Qnil;
2622 struct termios attr;
2623 int err;
2624 char summary[4] = "???"; /* This usually becomes "8N1". */
2625
2626 childp2 = Fcopy_sequence (p->childp);
2627
2628 /* Read port attributes and prepare default configuration. */
2629 err = tcgetattr (p->outfd, &attr);
2630 if (err != 0)
2631 report_file_error ("Failed tcgetattr", Qnil);
2632 cfmakeraw (&attr);
2633 #if defined (CLOCAL)
2634 attr.c_cflag |= CLOCAL;
2635 #endif
2636 #if defined (CREAD)
2637 attr.c_cflag |= CREAD;
2638 #endif
2639
2640 /* Configure speed. */
2641 if (!NILP (Fplist_member (contact, QCspeed)))
2642 tem = Fplist_get (contact, QCspeed);
2643 else
2644 tem = Fplist_get (p->childp, QCspeed);
2645 CHECK_NUMBER (tem);
2646 err = cfsetspeed (&attr, XINT (tem));
2647 if (err != 0)
2648 report_file_error ("Failed cfsetspeed", tem);
2649 childp2 = Fplist_put (childp2, QCspeed, tem);
2650
2651 /* Configure bytesize. */
2652 if (!NILP (Fplist_member (contact, QCbytesize)))
2653 tem = Fplist_get (contact, QCbytesize);
2654 else
2655 tem = Fplist_get (p->childp, QCbytesize);
2656 if (NILP (tem))
2657 tem = make_number (8);
2658 CHECK_NUMBER (tem);
2659 if (XINT (tem) != 7 && XINT (tem) != 8)
2660 error (":bytesize must be nil (8), 7, or 8");
2661 summary[0] = XINT (tem) + '0';
2662 #if defined (CSIZE) && defined (CS7) && defined (CS8)
2663 attr.c_cflag &= ~CSIZE;
2664 attr.c_cflag |= ((XINT (tem) == 7) ? CS7 : CS8);
2665 #else
2666 /* Don't error on bytesize 8, which should be set by cfmakeraw. */
2667 if (XINT (tem) != 8)
2668 error ("Bytesize cannot be changed");
2669 #endif
2670 childp2 = Fplist_put (childp2, QCbytesize, tem);
2671
2672 /* Configure parity. */
2673 if (!NILP (Fplist_member (contact, QCparity)))
2674 tem = Fplist_get (contact, QCparity);
2675 else
2676 tem = Fplist_get (p->childp, QCparity);
2677 if (!NILP (tem) && !EQ (tem, Qeven) && !EQ (tem, Qodd))
2678 error (":parity must be nil (no parity), `even', or `odd'");
2679 #if defined (PARENB) && defined (PARODD) && defined (IGNPAR) && defined (INPCK)
2680 attr.c_cflag &= ~(PARENB | PARODD);
2681 attr.c_iflag &= ~(IGNPAR | INPCK);
2682 if (NILP (tem))
2683 {
2684 summary[1] = 'N';
2685 }
2686 else if (EQ (tem, Qeven))
2687 {
2688 summary[1] = 'E';
2689 attr.c_cflag |= PARENB;
2690 attr.c_iflag |= (IGNPAR | INPCK);
2691 }
2692 else if (EQ (tem, Qodd))
2693 {
2694 summary[1] = 'O';
2695 attr.c_cflag |= (PARENB | PARODD);
2696 attr.c_iflag |= (IGNPAR | INPCK);
2697 }
2698 #else
2699 /* Don't error on no parity, which should be set by cfmakeraw. */
2700 if (!NILP (tem))
2701 error ("Parity cannot be configured");
2702 #endif
2703 childp2 = Fplist_put (childp2, QCparity, tem);
2704
2705 /* Configure stopbits. */
2706 if (!NILP (Fplist_member (contact, QCstopbits)))
2707 tem = Fplist_get (contact, QCstopbits);
2708 else
2709 tem = Fplist_get (p->childp, QCstopbits);
2710 if (NILP (tem))
2711 tem = make_number (1);
2712 CHECK_NUMBER (tem);
2713 if (XINT (tem) != 1 && XINT (tem) != 2)
2714 error (":stopbits must be nil (1 stopbit), 1, or 2");
2715 summary[2] = XINT (tem) + '0';
2716 #if defined (CSTOPB)
2717 attr.c_cflag &= ~CSTOPB;
2718 if (XINT (tem) == 2)
2719 attr.c_cflag |= CSTOPB;
2720 #else
2721 /* Don't error on 1 stopbit, which should be set by cfmakeraw. */
2722 if (XINT (tem) != 1)
2723 error ("Stopbits cannot be configured");
2724 #endif
2725 childp2 = Fplist_put (childp2, QCstopbits, tem);
2726
2727 /* Configure flowcontrol. */
2728 if (!NILP (Fplist_member (contact, QCflowcontrol)))
2729 tem = Fplist_get (contact, QCflowcontrol);
2730 else
2731 tem = Fplist_get (p->childp, QCflowcontrol);
2732 if (!NILP (tem) && !EQ (tem, Qhw) && !EQ (tem, Qsw))
2733 error (":flowcontrol must be nil (no flowcontrol), `hw', or `sw'");
2734 #if defined (CRTSCTS)
2735 attr.c_cflag &= ~CRTSCTS;
2736 #endif
2737 #if defined (CNEW_RTSCTS)
2738 attr.c_cflag &= ~CNEW_RTSCTS;
2739 #endif
2740 #if defined (IXON) && defined (IXOFF)
2741 attr.c_iflag &= ~(IXON | IXOFF);
2742 #endif
2743 if (NILP (tem))
2744 {
2745 /* Already configured. */
2746 }
2747 else if (EQ (tem, Qhw))
2748 {
2749 #if defined (CRTSCTS)
2750 attr.c_cflag |= CRTSCTS;
2751 #elif defined (CNEW_RTSCTS)
2752 attr.c_cflag |= CNEW_RTSCTS;
2753 #else
2754 error ("Hardware flowcontrol (RTS/CTS) not supported");
2755 #endif
2756 }
2757 else if (EQ (tem, Qsw))
2758 {
2759 #if defined (IXON) && defined (IXOFF)
2760 attr.c_iflag |= (IXON | IXOFF);
2761 #else
2762 error ("Software flowcontrol (XON/XOFF) not supported");
2763 #endif
2764 }
2765 childp2 = Fplist_put (childp2, QCflowcontrol, tem);
2766
2767 /* Activate configuration. */
2768 err = tcsetattr (p->outfd, TCSANOW, &attr);
2769 if (err != 0)
2770 report_file_error ("Failed tcsetattr", Qnil);
2771
2772 childp2 = Fplist_put (childp2, QCsummary, build_string (summary));
2773 pset_childp (p, childp2);
2774 }
2775 #endif /* not DOS_NT */
2776 \f
2777 /* System depended enumeration of and access to system processes a-la ps(1). */
2778
2779 #ifdef HAVE_PROCFS
2780
2781 /* Process enumeration and access via /proc. */
2782
2783 Lisp_Object
2784 list_system_processes (void)
2785 {
2786 Lisp_Object procdir, match, proclist, next;
2787 Lisp_Object tail;
2788
2789 /* For every process on the system, there's a directory in the
2790 "/proc" pseudo-directory whose name is the numeric ID of that
2791 process. */
2792 procdir = build_string ("/proc");
2793 match = build_string ("[0-9]+");
2794 proclist = directory_files_internal (procdir, Qnil, match, Qt, 0, Qnil);
2795
2796 /* `proclist' gives process IDs as strings. Destructively convert
2797 each string into a number. */
2798 for (tail = proclist; CONSP (tail); tail = next)
2799 {
2800 next = XCDR (tail);
2801 XSETCAR (tail, Fstring_to_number (XCAR (tail), Qnil));
2802 }
2803
2804 /* directory_files_internal returns the files in reverse order; undo
2805 that. */
2806 proclist = Fnreverse (proclist);
2807 return proclist;
2808 }
2809
2810 #elif defined DARWIN_OS || defined __FreeBSD__
2811
2812 Lisp_Object
2813 list_system_processes (void)
2814 {
2815 #ifdef DARWIN_OS
2816 int mib[] = {CTL_KERN, KERN_PROC, KERN_PROC_ALL};
2817 #else
2818 int mib[] = {CTL_KERN, KERN_PROC, KERN_PROC_PROC};
2819 #endif
2820 size_t len;
2821 struct kinfo_proc *procs;
2822 size_t i;
2823
2824 Lisp_Object proclist = Qnil;
2825
2826 if (sysctl (mib, 3, NULL, &len, NULL, 0) != 0)
2827 return proclist;
2828
2829 procs = xmalloc (len);
2830 if (sysctl (mib, 3, procs, &len, NULL, 0) != 0)
2831 {
2832 xfree (procs);
2833 return proclist;
2834 }
2835
2836 len /= sizeof (struct kinfo_proc);
2837 for (i = 0; i < len; i++)
2838 {
2839 #ifdef DARWIN_OS
2840 proclist = Fcons (make_fixnum_or_float (procs[i].kp_proc.p_pid), proclist);
2841 #else
2842 proclist = Fcons (make_fixnum_or_float (procs[i].ki_pid), proclist);
2843 #endif
2844 }
2845
2846 xfree (procs);
2847
2848 return proclist;
2849 }
2850
2851 /* The WINDOWSNT implementation is in w32.c.
2852 The MSDOS implementation is in dosfns.c. */
2853 #elif !defined (WINDOWSNT) && !defined (MSDOS)
2854
2855 Lisp_Object
2856 list_system_processes (void)
2857 {
2858 return Qnil;
2859 }
2860
2861 #endif /* !defined (WINDOWSNT) */
2862
2863 #if defined GNU_LINUX && defined HAVE_LONG_LONG_INT
2864 static struct timespec
2865 time_from_jiffies (unsigned long long tval, long hz)
2866 {
2867 unsigned long long s = tval / hz;
2868 unsigned long long frac = tval % hz;
2869 int ns;
2870
2871 if (TYPE_MAXIMUM (time_t) < s)
2872 time_overflow ();
2873 if (LONG_MAX - 1 <= ULLONG_MAX / TIMESPEC_RESOLUTION
2874 || frac <= ULLONG_MAX / TIMESPEC_RESOLUTION)
2875 ns = frac * TIMESPEC_RESOLUTION / hz;
2876 else
2877 {
2878 /* This is reachable only in the unlikely case that HZ * HZ
2879 exceeds ULLONG_MAX. It calculates an approximation that is
2880 guaranteed to be in range. */
2881 long hz_per_ns = (hz / TIMESPEC_RESOLUTION
2882 + (hz % TIMESPEC_RESOLUTION != 0));
2883 ns = frac / hz_per_ns;
2884 }
2885
2886 return make_timespec (s, ns);
2887 }
2888
2889 static Lisp_Object
2890 ltime_from_jiffies (unsigned long long tval, long hz)
2891 {
2892 struct timespec t = time_from_jiffies (tval, hz);
2893 return make_lisp_time (t);
2894 }
2895
2896 static struct timespec
2897 get_up_time (void)
2898 {
2899 FILE *fup;
2900 struct timespec up = make_timespec (0, 0);
2901
2902 block_input ();
2903 fup = emacs_fopen ("/proc/uptime", "r");
2904
2905 if (fup)
2906 {
2907 unsigned long long upsec, upfrac, idlesec, idlefrac;
2908 int upfrac_start, upfrac_end, idlefrac_start, idlefrac_end;
2909
2910 if (fscanf (fup, "%llu.%n%llu%n %llu.%n%llu%n",
2911 &upsec, &upfrac_start, &upfrac, &upfrac_end,
2912 &idlesec, &idlefrac_start, &idlefrac, &idlefrac_end)
2913 == 4)
2914 {
2915 if (TYPE_MAXIMUM (time_t) < upsec)
2916 {
2917 upsec = TYPE_MAXIMUM (time_t);
2918 upfrac = TIMESPEC_RESOLUTION - 1;
2919 }
2920 else
2921 {
2922 int upfraclen = upfrac_end - upfrac_start;
2923 for (; upfraclen < LOG10_TIMESPEC_RESOLUTION; upfraclen++)
2924 upfrac *= 10;
2925 for (; LOG10_TIMESPEC_RESOLUTION < upfraclen; upfraclen--)
2926 upfrac /= 10;
2927 upfrac = min (upfrac, TIMESPEC_RESOLUTION - 1);
2928 }
2929 up = make_timespec (upsec, upfrac);
2930 }
2931 fclose (fup);
2932 }
2933 unblock_input ();
2934
2935 return up;
2936 }
2937
2938 #define MAJOR(d) (((unsigned)(d) >> 8) & 0xfff)
2939 #define MINOR(d) (((unsigned)(d) & 0xff) | (((unsigned)(d) & 0xfff00000) >> 12))
2940
2941 static Lisp_Object
2942 procfs_ttyname (int rdev)
2943 {
2944 FILE *fdev;
2945 char name[PATH_MAX];
2946
2947 block_input ();
2948 fdev = emacs_fopen ("/proc/tty/drivers", "r");
2949 name[0] = 0;
2950
2951 if (fdev)
2952 {
2953 unsigned major;
2954 unsigned long minor_beg, minor_end;
2955 char minor[25]; /* 2 32-bit numbers + dash */
2956 char *endp;
2957
2958 for (; !feof (fdev) && !ferror (fdev); name[0] = 0)
2959 {
2960 if (fscanf (fdev, "%*s %s %u %s %*s\n", name, &major, minor) >= 3
2961 && major == MAJOR (rdev))
2962 {
2963 minor_beg = strtoul (minor, &endp, 0);
2964 if (*endp == '\0')
2965 minor_end = minor_beg;
2966 else if (*endp == '-')
2967 minor_end = strtoul (endp + 1, &endp, 0);
2968 else
2969 continue;
2970
2971 if (MINOR (rdev) >= minor_beg && MINOR (rdev) <= minor_end)
2972 {
2973 sprintf (name + strlen (name), "%u", MINOR (rdev));
2974 break;
2975 }
2976 }
2977 }
2978 fclose (fdev);
2979 }
2980 unblock_input ();
2981 return build_string (name);
2982 }
2983
2984 static uintmax_t
2985 procfs_get_total_memory (void)
2986 {
2987 FILE *fmem;
2988 uintmax_t retval = 2 * 1024 * 1024; /* default: 2 GiB */
2989 int c;
2990
2991 block_input ();
2992 fmem = emacs_fopen ("/proc/meminfo", "r");
2993
2994 if (fmem)
2995 {
2996 uintmax_t entry_value;
2997 bool done;
2998
2999 do
3000 switch (fscanf (fmem, "MemTotal: %"SCNuMAX, &entry_value))
3001 {
3002 case 1:
3003 retval = entry_value;
3004 done = 1;
3005 break;
3006
3007 case 0:
3008 while ((c = getc (fmem)) != EOF && c != '\n')
3009 continue;
3010 done = c == EOF;
3011 break;
3012
3013 default:
3014 done = 1;
3015 break;
3016 }
3017 while (!done);
3018
3019 fclose (fmem);
3020 }
3021 unblock_input ();
3022 return retval;
3023 }
3024
3025 Lisp_Object
3026 system_process_attributes (Lisp_Object pid)
3027 {
3028 char procfn[PATH_MAX], fn[PATH_MAX];
3029 struct stat st;
3030 struct passwd *pw;
3031 struct group *gr;
3032 long clocks_per_sec;
3033 char *procfn_end;
3034 char procbuf[1025], *p, *q;
3035 int fd;
3036 ssize_t nread;
3037 static char const default_cmd[] = "???";
3038 const char *cmd = default_cmd;
3039 int cmdsize = sizeof default_cmd - 1;
3040 char *cmdline = NULL;
3041 ptrdiff_t cmdline_size;
3042 char c;
3043 printmax_t proc_id;
3044 int ppid, pgrp, sess, tty, tpgid, thcount;
3045 uid_t uid;
3046 gid_t gid;
3047 unsigned long long u_time, s_time, cutime, cstime, start;
3048 long priority, niceness, rss;
3049 unsigned long minflt, majflt, cminflt, cmajflt, vsize;
3050 struct timespec tnow, tstart, tboot, telapsed, us_time;
3051 double pcpu, pmem;
3052 Lisp_Object attrs = Qnil;
3053 Lisp_Object cmd_str, decoded_cmd;
3054 ptrdiff_t count;
3055
3056 CHECK_NUMBER_OR_FLOAT (pid);
3057 CONS_TO_INTEGER (pid, pid_t, proc_id);
3058 sprintf (procfn, "/proc/%"pMd, proc_id);
3059 if (stat (procfn, &st) < 0)
3060 return attrs;
3061
3062 /* euid egid */
3063 uid = st.st_uid;
3064 attrs = Fcons (Fcons (Qeuid, make_fixnum_or_float (uid)), attrs);
3065 block_input ();
3066 pw = getpwuid (uid);
3067 unblock_input ();
3068 if (pw)
3069 attrs = Fcons (Fcons (Quser, build_string (pw->pw_name)), attrs);
3070
3071 gid = st.st_gid;
3072 attrs = Fcons (Fcons (Qegid, make_fixnum_or_float (gid)), attrs);
3073 block_input ();
3074 gr = getgrgid (gid);
3075 unblock_input ();
3076 if (gr)
3077 attrs = Fcons (Fcons (Qgroup, build_string (gr->gr_name)), attrs);
3078
3079 count = SPECPDL_INDEX ();
3080 strcpy (fn, procfn);
3081 procfn_end = fn + strlen (fn);
3082 strcpy (procfn_end, "/stat");
3083 fd = emacs_open (fn, O_RDONLY, 0);
3084 if (fd < 0)
3085 nread = 0;
3086 else
3087 {
3088 record_unwind_protect_int (close_file_unwind, fd);
3089 nread = emacs_read (fd, procbuf, sizeof procbuf - 1);
3090 }
3091 if (0 < nread)
3092 {
3093 procbuf[nread] = '\0';
3094 p = procbuf;
3095
3096 p = strchr (p, '(');
3097 if (p != NULL)
3098 {
3099 q = strrchr (p + 1, ')');
3100 /* comm */
3101 if (q != NULL)
3102 {
3103 cmd = p + 1;
3104 cmdsize = q - cmd;
3105 }
3106 }
3107 else
3108 q = NULL;
3109 /* Command name is encoded in locale-coding-system; decode it. */
3110 cmd_str = make_unibyte_string (cmd, cmdsize);
3111 decoded_cmd = code_convert_string_norecord (cmd_str,
3112 Vlocale_coding_system, 0);
3113 attrs = Fcons (Fcons (Qcomm, decoded_cmd), attrs);
3114
3115 /* state ppid pgrp sess tty tpgid . minflt cminflt majflt cmajflt
3116 utime stime cutime cstime priority nice thcount . start vsize rss */
3117 if (q
3118 && (sscanf (q + 2, ("%c %d %d %d %d %d %*u %lu %lu %lu %lu "
3119 "%Lu %Lu %Lu %Lu %ld %ld %d %*d %Lu %lu %ld"),
3120 &c, &ppid, &pgrp, &sess, &tty, &tpgid,
3121 &minflt, &cminflt, &majflt, &cmajflt,
3122 &u_time, &s_time, &cutime, &cstime,
3123 &priority, &niceness, &thcount, &start, &vsize, &rss)
3124 == 20))
3125 {
3126 char state_str[2];
3127 state_str[0] = c;
3128 state_str[1] = '\0';
3129 attrs = Fcons (Fcons (Qstate, build_string (state_str)), attrs);
3130 attrs = Fcons (Fcons (Qppid, make_fixnum_or_float (ppid)), attrs);
3131 attrs = Fcons (Fcons (Qpgrp, make_fixnum_or_float (pgrp)), attrs);
3132 attrs = Fcons (Fcons (Qsess, make_fixnum_or_float (sess)), attrs);
3133 attrs = Fcons (Fcons (Qttname, procfs_ttyname (tty)), attrs);
3134 attrs = Fcons (Fcons (Qtpgid, make_fixnum_or_float (tpgid)), attrs);
3135 attrs = Fcons (Fcons (Qminflt, make_fixnum_or_float (minflt)), attrs);
3136 attrs = Fcons (Fcons (Qmajflt, make_fixnum_or_float (majflt)), attrs);
3137 attrs = Fcons (Fcons (Qcminflt, make_fixnum_or_float (cminflt)),
3138 attrs);
3139 attrs = Fcons (Fcons (Qcmajflt, make_fixnum_or_float (cmajflt)),
3140 attrs);
3141 clocks_per_sec = sysconf (_SC_CLK_TCK);
3142 if (clocks_per_sec < 0)
3143 clocks_per_sec = 100;
3144 attrs = Fcons (Fcons (Qutime,
3145 ltime_from_jiffies (u_time, clocks_per_sec)),
3146 attrs);
3147 attrs = Fcons (Fcons (Qstime,
3148 ltime_from_jiffies (s_time, clocks_per_sec)),
3149 attrs);
3150 attrs = Fcons (Fcons (Qtime,
3151 ltime_from_jiffies (s_time + u_time,
3152 clocks_per_sec)),
3153 attrs);
3154 attrs = Fcons (Fcons (Qcutime,
3155 ltime_from_jiffies (cutime, clocks_per_sec)),
3156 attrs);
3157 attrs = Fcons (Fcons (Qcstime,
3158 ltime_from_jiffies (cstime, clocks_per_sec)),
3159 attrs);
3160 attrs = Fcons (Fcons (Qctime,
3161 ltime_from_jiffies (cstime + cutime,
3162 clocks_per_sec)),
3163 attrs);
3164 attrs = Fcons (Fcons (Qpri, make_number (priority)), attrs);
3165 attrs = Fcons (Fcons (Qnice, make_number (niceness)), attrs);
3166 attrs = Fcons (Fcons (Qthcount, make_fixnum_or_float (thcount)),
3167 attrs);
3168 tnow = current_timespec ();
3169 telapsed = get_up_time ();
3170 tboot = timespec_sub (tnow, telapsed);
3171 tstart = time_from_jiffies (start, clocks_per_sec);
3172 tstart = timespec_add (tboot, tstart);
3173 attrs = Fcons (Fcons (Qstart, make_lisp_time (tstart)), attrs);
3174 attrs = Fcons (Fcons (Qvsize, make_fixnum_or_float (vsize / 1024)),
3175 attrs);
3176 attrs = Fcons (Fcons (Qrss, make_fixnum_or_float (4 * rss)), attrs);
3177 telapsed = timespec_sub (tnow, tstart);
3178 attrs = Fcons (Fcons (Qetime, make_lisp_time (telapsed)), attrs);
3179 us_time = time_from_jiffies (u_time + s_time, clocks_per_sec);
3180 pcpu = timespectod (us_time) / timespectod (telapsed);
3181 if (pcpu > 1.0)
3182 pcpu = 1.0;
3183 attrs = Fcons (Fcons (Qpcpu, make_float (100 * pcpu)), attrs);
3184 pmem = 4.0 * 100 * rss / procfs_get_total_memory ();
3185 if (pmem > 100)
3186 pmem = 100;
3187 attrs = Fcons (Fcons (Qpmem, make_float (pmem)), attrs);
3188 }
3189 }
3190 unbind_to (count, Qnil);
3191
3192 /* args */
3193 strcpy (procfn_end, "/cmdline");
3194 fd = emacs_open (fn, O_RDONLY, 0);
3195 if (fd >= 0)
3196 {
3197 ptrdiff_t readsize, nread_incr;
3198 record_unwind_protect_int (close_file_unwind, fd);
3199 record_unwind_protect_nothing ();
3200 nread = cmdline_size = 0;
3201
3202 do
3203 {
3204 cmdline = xpalloc (cmdline, &cmdline_size, 2, STRING_BYTES_BOUND, 1);
3205 set_unwind_protect_ptr (count + 1, xfree, cmdline);
3206
3207 /* Leave room even if every byte needs escaping below. */
3208 readsize = (cmdline_size >> 1) - nread;
3209
3210 nread_incr = emacs_read (fd, cmdline + nread, readsize);
3211 nread += max (0, nread_incr);
3212 }
3213 while (nread_incr == readsize);
3214
3215 if (nread)
3216 {
3217 /* We don't want trailing null characters. */
3218 for (p = cmdline + nread; cmdline < p && !p[-1]; p--)
3219 continue;
3220
3221 /* Escape-quote whitespace and backslashes. */
3222 q = cmdline + cmdline_size;
3223 while (cmdline < p)
3224 {
3225 char c = *--p;
3226 *--q = c ? c : ' ';
3227 if (c_isspace (c) || c == '\\')
3228 *--q = '\\';
3229 }
3230
3231 nread = cmdline + cmdline_size - q;
3232 }
3233
3234 if (!nread)
3235 {
3236 nread = cmdsize + 2;
3237 cmdline_size = nread + 1;
3238 q = cmdline = xrealloc (cmdline, cmdline_size);
3239 set_unwind_protect_ptr (count + 1, xfree, cmdline);
3240 sprintf (cmdline, "[%.*s]", cmdsize, cmd);
3241 }
3242 /* Command line is encoded in locale-coding-system; decode it. */
3243 cmd_str = make_unibyte_string (q, nread);
3244 decoded_cmd = code_convert_string_norecord (cmd_str,
3245 Vlocale_coding_system, 0);
3246 unbind_to (count, Qnil);
3247 attrs = Fcons (Fcons (Qargs, decoded_cmd), attrs);
3248 }
3249
3250 return attrs;
3251 }
3252
3253 #elif defined (SOLARIS2) && defined (HAVE_PROCFS)
3254
3255 /* The <procfs.h> header does not like to be included if _LP64 is defined and
3256 __FILE_OFFSET_BITS == 64. This is an ugly workaround that. */
3257 #if !defined (_LP64) && defined (_FILE_OFFSET_BITS) && (_FILE_OFFSET_BITS == 64)
3258 #define PROCFS_FILE_OFFSET_BITS_HACK 1
3259 #undef _FILE_OFFSET_BITS
3260 #else
3261 #define PROCFS_FILE_OFFSET_BITS_HACK 0
3262 #endif
3263
3264 #include <procfs.h>
3265
3266 #if PROCFS_FILE_OFFSET_BITS_HACK == 1
3267 #define _FILE_OFFSET_BITS 64
3268 #ifdef _FILE_OFFSET_BITS /* Avoid unused-macro warnings. */
3269 #endif
3270 #endif /* PROCFS_FILE_OFFSET_BITS_HACK == 1 */
3271
3272 Lisp_Object
3273 system_process_attributes (Lisp_Object pid)
3274 {
3275 char procfn[PATH_MAX], fn[PATH_MAX];
3276 struct stat st;
3277 struct passwd *pw;
3278 struct group *gr;
3279 char *procfn_end;
3280 struct psinfo pinfo;
3281 int fd;
3282 ssize_t nread;
3283 printmax_t proc_id;
3284 uid_t uid;
3285 gid_t gid;
3286 Lisp_Object attrs = Qnil;
3287 Lisp_Object decoded_cmd;
3288 ptrdiff_t count;
3289
3290 CHECK_NUMBER_OR_FLOAT (pid);
3291 CONS_TO_INTEGER (pid, pid_t, proc_id);
3292 sprintf (procfn, "/proc/%"pMd, proc_id);
3293 if (stat (procfn, &st) < 0)
3294 return attrs;
3295
3296 /* euid egid */
3297 uid = st.st_uid;
3298 attrs = Fcons (Fcons (Qeuid, make_fixnum_or_float (uid)), attrs);
3299 block_input ();
3300 pw = getpwuid (uid);
3301 unblock_input ();
3302 if (pw)
3303 attrs = Fcons (Fcons (Quser, build_string (pw->pw_name)), attrs);
3304
3305 gid = st.st_gid;
3306 attrs = Fcons (Fcons (Qegid, make_fixnum_or_float (gid)), attrs);
3307 block_input ();
3308 gr = getgrgid (gid);
3309 unblock_input ();
3310 if (gr)
3311 attrs = Fcons (Fcons (Qgroup, build_string (gr->gr_name)), attrs);
3312
3313 count = SPECPDL_INDEX ();
3314 strcpy (fn, procfn);
3315 procfn_end = fn + strlen (fn);
3316 strcpy (procfn_end, "/psinfo");
3317 fd = emacs_open (fn, O_RDONLY, 0);
3318 if (fd < 0)
3319 nread = 0;
3320 else
3321 {
3322 record_unwind_protect (close_file_unwind, fd);
3323 nread = emacs_read (fd, &pinfo, sizeof pinfo);
3324 }
3325
3326 if (nread == sizeof pinfo)
3327 {
3328 attrs = Fcons (Fcons (Qppid, make_fixnum_or_float (pinfo.pr_ppid)), attrs);
3329 attrs = Fcons (Fcons (Qpgrp, make_fixnum_or_float (pinfo.pr_pgid)), attrs);
3330 attrs = Fcons (Fcons (Qsess, make_fixnum_or_float (pinfo.pr_sid)), attrs);
3331
3332 {
3333 char state_str[2];
3334 state_str[0] = pinfo.pr_lwp.pr_sname;
3335 state_str[1] = '\0';
3336 attrs = Fcons (Fcons (Qstate, build_string (state_str)), attrs);
3337 }
3338
3339 /* FIXME: missing Qttyname. psinfo.pr_ttydev is a dev_t,
3340 need to get a string from it. */
3341
3342 /* FIXME: missing: Qtpgid */
3343
3344 /* FIXME: missing:
3345 Qminflt
3346 Qmajflt
3347 Qcminflt
3348 Qcmajflt
3349
3350 Qutime
3351 Qcutime
3352 Qstime
3353 Qcstime
3354 Are they available? */
3355
3356 attrs = Fcons (Fcons (Qtime, make_lisp_time (pinfo.pr_time)), attrs);
3357 attrs = Fcons (Fcons (Qctime, make_lisp_time (pinfo.pr_ctime)), attrs);
3358 attrs = Fcons (Fcons (Qpri, make_number (pinfo.pr_lwp.pr_pri)), attrs);
3359 attrs = Fcons (Fcons (Qnice, make_number (pinfo.pr_lwp.pr_nice)), attrs);
3360 attrs = Fcons (Fcons (Qthcount, make_fixnum_or_float (pinfo.pr_nlwp)),
3361 attrs);
3362
3363 attrs = Fcons (Fcons (Qstart, make_lisp_time (pinfo.pr_start)), attrs);
3364 attrs = Fcons (Fcons (Qvsize, make_fixnum_or_float (pinfo.pr_size)),
3365 attrs);
3366 attrs = Fcons (Fcons (Qrss, make_fixnum_or_float (pinfo.pr_rssize)),
3367 attrs);
3368
3369 /* pr_pctcpu and pr_pctmem are unsigned integers in the
3370 range 0 .. 2**15, representing 0.0 .. 1.0. */
3371 attrs = Fcons (Fcons (Qpcpu,
3372 make_float (100.0 / 0x8000 * pinfo.pr_pctcpu)),
3373 attrs);
3374 attrs = Fcons (Fcons (Qpmem,
3375 make_float (100.0 / 0x8000 * pinfo.pr_pctmem)),
3376 attrs);
3377
3378 decoded_cmd = (code_convert_string_norecord
3379 (build_unibyte_string (pinfo.pr_fname),
3380 Vlocale_coding_system, 0));
3381 attrs = Fcons (Fcons (Qcomm, decoded_cmd), attrs);
3382 decoded_cmd = (code_convert_string_norecord
3383 (build_unibyte_string (pinfo.pr_psargs),
3384 Vlocale_coding_system, 0));
3385 attrs = Fcons (Fcons (Qargs, decoded_cmd), attrs);
3386 }
3387 unbind_to (count, Qnil);
3388 return attrs;
3389 }
3390
3391 #elif defined __FreeBSD__
3392
3393 static struct timespec
3394 timeval_to_timespec (struct timeval t)
3395 {
3396 return make_timespec (t.tv_sec, t.tv_usec * 1000);
3397 }
3398
3399 static Lisp_Object
3400 make_lisp_timeval (struct timeval t)
3401 {
3402 return make_lisp_time (timeval_to_timespec (t));
3403 }
3404
3405 Lisp_Object
3406 system_process_attributes (Lisp_Object pid)
3407 {
3408 int proc_id;
3409 int pagesize = getpagesize ();
3410 unsigned long npages;
3411 int fscale;
3412 struct passwd *pw;
3413 struct group *gr;
3414 char *ttyname;
3415 size_t len;
3416 char args[MAXPATHLEN];
3417 struct timespec t, now;
3418
3419 int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PID};
3420 struct kinfo_proc proc;
3421 size_t proclen = sizeof proc;
3422
3423 Lisp_Object attrs = Qnil;
3424 Lisp_Object decoded_comm;
3425
3426 CHECK_NUMBER_OR_FLOAT (pid);
3427 CONS_TO_INTEGER (pid, int, proc_id);
3428 mib[3] = proc_id;
3429
3430 if (sysctl (mib, 4, &proc, &proclen, NULL, 0) != 0)
3431 return attrs;
3432
3433 attrs = Fcons (Fcons (Qeuid, make_fixnum_or_float (proc.ki_uid)), attrs);
3434
3435 block_input ();
3436 pw = getpwuid (proc.ki_uid);
3437 unblock_input ();
3438 if (pw)
3439 attrs = Fcons (Fcons (Quser, build_string (pw->pw_name)), attrs);
3440
3441 attrs = Fcons (Fcons (Qegid, make_fixnum_or_float (proc.ki_svgid)), attrs);
3442
3443 block_input ();
3444 gr = getgrgid (proc.ki_svgid);
3445 unblock_input ();
3446 if (gr)
3447 attrs = Fcons (Fcons (Qgroup, build_string (gr->gr_name)), attrs);
3448
3449 decoded_comm = (code_convert_string_norecord
3450 (build_unibyte_string (proc.ki_comm),
3451 Vlocale_coding_system, 0));
3452
3453 attrs = Fcons (Fcons (Qcomm, decoded_comm), attrs);
3454 {
3455 char state[2] = {'\0', '\0'};
3456 switch (proc.ki_stat)
3457 {
3458 case SRUN:
3459 state[0] = 'R';
3460 break;
3461
3462 case SSLEEP:
3463 state[0] = 'S';
3464 break;
3465
3466 case SLOCK:
3467 state[0] = 'D';
3468 break;
3469
3470 case SZOMB:
3471 state[0] = 'Z';
3472 break;
3473
3474 case SSTOP:
3475 state[0] = 'T';
3476 break;
3477 }
3478 attrs = Fcons (Fcons (Qstate, build_string (state)), attrs);
3479 }
3480
3481 attrs = Fcons (Fcons (Qppid, make_fixnum_or_float (proc.ki_ppid)), attrs);
3482 attrs = Fcons (Fcons (Qpgrp, make_fixnum_or_float (proc.ki_pgid)), attrs);
3483 attrs = Fcons (Fcons (Qsess, make_fixnum_or_float (proc.ki_sid)), attrs);
3484
3485 block_input ();
3486 ttyname = proc.ki_tdev == NODEV ? NULL : devname (proc.ki_tdev, S_IFCHR);
3487 unblock_input ();
3488 if (ttyname)
3489 attrs = Fcons (Fcons (Qtty, build_string (ttyname)), attrs);
3490
3491 attrs = Fcons (Fcons (Qtpgid, make_fixnum_or_float (proc.ki_tpgid)), attrs);
3492 attrs = Fcons (Fcons (Qminflt, make_fixnum_or_float (proc.ki_rusage.ru_minflt)), attrs);
3493 attrs = Fcons (Fcons (Qmajflt, make_fixnum_or_float (proc.ki_rusage.ru_majflt)), attrs);
3494 attrs = Fcons (Fcons (Qcminflt, make_number (proc.ki_rusage_ch.ru_minflt)), attrs);
3495 attrs = Fcons (Fcons (Qcmajflt, make_number (proc.ki_rusage_ch.ru_majflt)), attrs);
3496
3497 attrs = Fcons (Fcons (Qutime, make_lisp_timeval (proc.ki_rusage.ru_utime)),
3498 attrs);
3499 attrs = Fcons (Fcons (Qstime, make_lisp_timeval (proc.ki_rusage.ru_stime)),
3500 attrs);
3501 t = timespec_add (timeval_to_timespec (proc.ki_rusage.ru_utime),
3502 timeval_to_timespec (proc.ki_rusage.ru_stime));
3503 attrs = Fcons (Fcons (Qtime, make_lisp_time (t)), attrs);
3504
3505 attrs = Fcons (Fcons (Qcutime,
3506 make_lisp_timeval (proc.ki_rusage_ch.ru_utime)),
3507 attrs);
3508 attrs = Fcons (Fcons (Qcstime,
3509 make_lisp_timeval (proc.ki_rusage_ch.ru_utime)),
3510 attrs);
3511 t = timespec_add (timeval_to_timespec (proc.ki_rusage_ch.ru_utime),
3512 timeval_to_timespec (proc.ki_rusage_ch.ru_stime));
3513 attrs = Fcons (Fcons (Qctime, make_lisp_time (t)), attrs);
3514
3515 attrs = Fcons (Fcons (Qthcount, make_fixnum_or_float (proc.ki_numthreads)),
3516 attrs);
3517 attrs = Fcons (Fcons (Qpri, make_number (proc.ki_pri.pri_native)), attrs);
3518 attrs = Fcons (Fcons (Qnice, make_number (proc.ki_nice)), attrs);
3519 attrs = Fcons (Fcons (Qstart, make_lisp_timeval (proc.ki_start)), attrs);
3520 attrs = Fcons (Fcons (Qvsize, make_number (proc.ki_size >> 10)), attrs);
3521 attrs = Fcons (Fcons (Qrss, make_number (proc.ki_rssize * pagesize >> 10)),
3522 attrs);
3523
3524 now = current_timespec ();
3525 t = timespec_sub (now, timeval_to_timespec (proc.ki_start));
3526 attrs = Fcons (Fcons (Qetime, make_lisp_time (t)), attrs);
3527
3528 len = sizeof fscale;
3529 if (sysctlbyname ("kern.fscale", &fscale, &len, NULL, 0) == 0)
3530 {
3531 double pcpu;
3532 fixpt_t ccpu;
3533 len = sizeof ccpu;
3534 if (sysctlbyname ("kern.ccpu", &ccpu, &len, NULL, 0) == 0)
3535 {
3536 pcpu = (100.0 * proc.ki_pctcpu / fscale
3537 / (1 - exp (proc.ki_swtime * log ((double) ccpu / fscale))));
3538 attrs = Fcons (Fcons (Qpcpu, make_fixnum_or_float (pcpu)), attrs);
3539 }
3540 }
3541
3542 len = sizeof npages;
3543 if (sysctlbyname ("hw.availpages", &npages, &len, NULL, 0) == 0)
3544 {
3545 double pmem = (proc.ki_flag & P_INMEM
3546 ? 100.0 * proc.ki_rssize / npages
3547 : 0);
3548 attrs = Fcons (Fcons (Qpmem, make_fixnum_or_float (pmem)), attrs);
3549 }
3550
3551 mib[2] = KERN_PROC_ARGS;
3552 len = MAXPATHLEN;
3553 if (sysctl (mib, 4, args, &len, NULL, 0) == 0)
3554 {
3555 int i;
3556 for (i = 0; i < len; i++)
3557 {
3558 if (! args[i] && i < len - 1)
3559 args[i] = ' ';
3560 }
3561
3562 decoded_comm =
3563 (code_convert_string_norecord
3564 (build_unibyte_string (args),
3565 Vlocale_coding_system, 0));
3566
3567 attrs = Fcons (Fcons (Qargs, decoded_comm), attrs);
3568 }
3569
3570 return attrs;
3571 }
3572
3573 /* The WINDOWSNT implementation is in w32.c.
3574 The MSDOS implementation is in dosfns.c. */
3575 #elif !defined (WINDOWSNT) && !defined (MSDOS)
3576
3577 Lisp_Object
3578 system_process_attributes (Lisp_Object pid)
3579 {
3580 return Qnil;
3581 }
3582
3583 #endif /* !defined (WINDOWSNT) */
3584 \f
3585 /* Wide character string collation. */
3586
3587 #ifdef __STDC_ISO_10646__
3588 # include <wchar.h>
3589 # include <wctype.h>
3590
3591 # if defined HAVE_NEWLOCALE || defined HAVE_SETLOCALE
3592 # include <locale.h>
3593 # endif
3594 # ifndef LC_COLLATE
3595 # define LC_COLLATE 0
3596 # endif
3597 # ifndef LC_COLLATE_MASK
3598 # define LC_COLLATE_MASK 0
3599 # endif
3600 # ifndef LC_CTYPE
3601 # define LC_CTYPE 0
3602 # endif
3603 # ifndef LC_CTYPE_MASK
3604 # define LC_CTYPE_MASK 0
3605 # endif
3606
3607 # ifndef HAVE_NEWLOCALE
3608 # undef freelocale
3609 # undef locale_t
3610 # undef newlocale
3611 # undef wcscoll_l
3612 # undef towlower_l
3613 # define freelocale emacs_freelocale
3614 # define locale_t emacs_locale_t
3615 # define newlocale emacs_newlocale
3616 # define wcscoll_l emacs_wcscoll_l
3617 # define towlower_l emacs_towlower_l
3618
3619 typedef char const *locale_t;
3620
3621 static locale_t
3622 newlocale (int category_mask, char const *locale, locale_t loc)
3623 {
3624 return locale;
3625 }
3626
3627 static void
3628 freelocale (locale_t loc)
3629 {
3630 }
3631
3632 static char *
3633 emacs_setlocale (int category, char const *locale)
3634 {
3635 # ifdef HAVE_SETLOCALE
3636 errno = 0;
3637 char *loc = setlocale (category, locale);
3638 if (loc || errno)
3639 return loc;
3640 errno = EINVAL;
3641 # else
3642 errno = ENOTSUP;
3643 # endif
3644 return 0;
3645 }
3646
3647 static int
3648 wcscoll_l (wchar_t const *a, wchar_t const *b, locale_t loc)
3649 {
3650 int result = 0;
3651 char *oldloc = emacs_setlocale (LC_COLLATE, NULL);
3652 int err;
3653
3654 if (! oldloc)
3655 err = errno;
3656 else
3657 {
3658 USE_SAFE_ALLOCA;
3659 char *oldcopy = SAFE_ALLOCA (strlen (oldloc) + 1);
3660 strcpy (oldcopy, oldloc);
3661 if (! emacs_setlocale (LC_COLLATE, loc))
3662 err = errno;
3663 else
3664 {
3665 errno = 0;
3666 result = wcscoll (a, b);
3667 err = errno;
3668 if (! emacs_setlocale (LC_COLLATE, oldcopy))
3669 err = errno;
3670 }
3671 SAFE_FREE ();
3672 }
3673
3674 errno = err;
3675 return result;
3676 }
3677
3678 static wint_t
3679 towlower_l (wint_t wc, locale_t loc)
3680 {
3681 wint_t result = wc;
3682 char *oldloc = emacs_setlocale (LC_CTYPE, NULL);
3683
3684 if (oldloc)
3685 {
3686 USE_SAFE_ALLOCA;
3687 char *oldcopy = SAFE_ALLOCA (strlen (oldloc) + 1);
3688 strcpy (oldcopy, oldloc);
3689 if (emacs_setlocale (LC_CTYPE, loc))
3690 {
3691 result = towlower (wc);
3692 emacs_setlocale (LC_COLLATE, oldcopy);
3693 }
3694 SAFE_FREE ();
3695 }
3696
3697 return result;
3698 }
3699 # endif
3700
3701 int
3702 str_collate (Lisp_Object s1, Lisp_Object s2,
3703 Lisp_Object locale, Lisp_Object ignore_case)
3704 {
3705 int res, err;
3706 ptrdiff_t len, i, i_byte;
3707 wchar_t *p1, *p2;
3708
3709 USE_SAFE_ALLOCA;
3710
3711 /* Convert byte stream to code points. */
3712 len = SCHARS (s1); i = i_byte = 0;
3713 SAFE_NALLOCA (p1, 1, len + 1);
3714 while (i < len)
3715 FETCH_STRING_CHAR_ADVANCE (*(p1+i-1), s1, i, i_byte);
3716 *(p1+len) = 0;
3717
3718 len = SCHARS (s2); i = i_byte = 0;
3719 SAFE_NALLOCA (p2, 1, len + 1);
3720 while (i < len)
3721 FETCH_STRING_CHAR_ADVANCE (*(p2+i-1), s2, i, i_byte);
3722 *(p2+len) = 0;
3723
3724 if (STRINGP (locale))
3725 {
3726 locale_t loc = newlocale (LC_COLLATE_MASK | LC_CTYPE_MASK,
3727 SSDATA (locale), 0);
3728 if (!loc)
3729 error ("Invalid locale %s: %s", SSDATA (locale), strerror (errno));
3730
3731 if (! NILP (ignore_case))
3732 for (int i = 1; i < 3; i++)
3733 {
3734 wchar_t *p = (i == 1) ? p1 : p2;
3735 for (; *p; p++)
3736 *p = towlower_l (*p, loc);
3737 }
3738
3739 errno = 0;
3740 res = wcscoll_l (p1, p2, loc);
3741 err = errno;
3742 freelocale (loc);
3743 }
3744 else
3745 {
3746 if (! NILP (ignore_case))
3747 for (int i = 1; i < 3; i++)
3748 {
3749 wchar_t *p = (i == 1) ? p1 : p2;
3750 for (; *p; p++)
3751 *p = towlower (*p);
3752 }
3753
3754 errno = 0;
3755 res = wcscoll (p1, p2);
3756 err = errno;
3757 }
3758 # ifndef HAVE_NEWLOCALE
3759 if (err)
3760 error ("Invalid locale or string for collation: %s", strerror (err));
3761 # else
3762 if (err)
3763 error ("Invalid string for collation: %s", strerror (err));
3764 # endif
3765
3766 SAFE_FREE ();
3767 return res;
3768 }
3769 #endif /* __STDC_ISO_10646__ */
3770
3771 #ifdef WINDOWSNT
3772 int
3773 str_collate (Lisp_Object s1, Lisp_Object s2,
3774 Lisp_Object locale, Lisp_Object ignore_case)
3775 {
3776
3777 char *loc = STRINGP (locale) ? SSDATA (locale) : NULL;
3778 int res, err = errno;
3779
3780 errno = 0;
3781 res = w32_compare_strings (SDATA (s1), SDATA (s2), loc, !NILP (ignore_case));
3782 if (errno)
3783 error ("Invalid string for collation: %s", strerror (errno));
3784
3785 errno = err;
3786 return res;
3787 }
3788 #endif /* WINDOWSNT */