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code.delx.au - gnu-emacs/blob - src/s/usg5-4.h
1 /* Definitions file for GNU Emacs running on AT&T's System V Release 4
2 Copyright (C) 1987, 1990, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
3 2006, 2007, 2008 Free Software Foundation, Inc.
5 This file is part of GNU Emacs.
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
10 (at your option) any later version.
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.
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/>. */
20 /* This file written by James Van Artsdalen of Dell Computer Corporation.
21 * james@bigtex.cactus.org. Subsequently improved for Dell 2.2 by Eric
22 * S. Raymond <esr@snark.thyrsus.com>.
25 /* Use the SysVr3 file for at least base configuration. */
27 #define USG /* System III, System V, etc */
32 /* SYSTEM_TYPE should indicate the kind of system you are using.
33 It sets the Lisp variable system-type. */
35 #define SYSTEM_TYPE "usg-unix-v"
38 * Define HAVE_TERMIO if the system provides sysV-style ioctls
39 * for terminal control.
45 * Define HAVE_PTYS if the system supports pty devices.
49 * Define SYSV_SYSTEM_DIR to use the V.3 getdents/readir
50 * library functions. Almost, but not quite the same as
53 #define SYSV_SYSTEM_DIR
55 /* The file containing the kernel's symbol table is called /unix. */
57 #define KERNEL_FILE "/unix"
59 /* The symbol in the kernel where the load average is found
62 #define LDAV_SYMBOL "avenrun"
64 /* Special hacks needed to make Emacs run on this system. */
67 * Make the sigsetmask function go away. Don't know what the
68 * ramifications of this are, but doesn't seem possible to
69 * emulate it properly anyway at this point.
72 #define sigsetmask(mask) /* Null expansion */
74 /* setjmp and longjmp can safely replace _setjmp and _longjmp,
75 but they will run slower. */
77 #define _setjmp setjmp
78 #define _longjmp longjmp
80 /* On USG systems these have different names */
83 #endif /* ! defined (HAVE_INDEX) */
85 #define rindex strrchr
86 #endif /* ! defined (HAVE_RINDEX) */
88 /* Compiler bug bites on many systems when default ADDR_CORRECT is used. */
90 #define ADDR_CORRECT(x) (x)
92 /* Use terminfo instead of termcap. */
97 /* The docs for system V/386 suggest v.3 has sigpause,
98 so let's give it a try. */
99 #define HAVE_SYSV_SIGPAUSE
102 /* If we're using the System V X port, BSD bstring functions will be handy */
104 #ifdef HAVE_X_WINDOWS
106 #endif /* HAVE_X_WINDOWS */
108 /* On USG systems signal handlers return void */
112 #define ORDINARY_LINK
116 /* there are no -lg libraries on this system, and no libPW */
120 /* Undump with ELF */
124 #define UNEXEC unexelf.o
126 /* Get FIONREAD from <sys/filio.h>. Get <sys/ttold.h> to get struct
127 * tchars. But get <termio.h> first to make sure ttold.h doesn't
128 * interfere. And don't try to use SIGIO yet.
132 #include <sys/wait.h>
136 #include <sys/filio.h>
138 #include <sys/ttold.h>
140 #include <sys/stream.h>
141 #include <sys/stropts.h>
142 #include <sys/termios.h>
146 /* Some SVr4s don't define NSIG in sys/signal.h for ANSI environments;
147 * instead, there's a system variable _sys_nsig. Unfortunately, we need the
148 * constant to dimension an array. So wire in the appropriate value here.
150 #define NSIG_MINIMUM 32
152 /* We can support this */
154 #define CLASH_DETECTION
159 /* It is possible to receive SIGCHLD when there are no children
160 waiting, because a previous waitsys(2) cleaned up the carcass of child
161 without clearing the SIGCHLD pending info. So, use a non-blocking
162 wait3 instead, which maps to waitpid(2) in SysVr4. */
164 #define wait3(status, options, rusage) \
165 waitpid ((pid_t) -1, (status), (options))
166 #define WRETCODE(w) (w >> 8)
168 /* TIOCGPGRP is broken in SysVr4, so we can't send signals to PTY
169 subprocesses the usual way. But TIOCSIGNAL does work for PTYs, and
170 this is all we need. */
172 #define TIOCSIGSEND TIOCSIGNAL
174 /* This change means that we don't loop through allocate_pty too many
175 times in the (rare) event of a failure. */
177 #define FIRST_PTY_LETTER 'z'
179 /* This sets the name of the master side of the PTY. */
181 #define PTY_NAME_SPRINTF strcpy (pty_name, "/dev/ptmx");
183 /* This sets the name of the slave side of the PTY. On SysVr4,
184 grantpt(3) forks a subprocess, so keep sigchld_handler() from
185 intercepting that death. If any child but grantpt's should die
186 within, it should be caught after sigrelse(2). */
188 #define PTY_TTY_NAME_SPRINTF \
190 char *ptsname (), *ptyname; \
193 if (grantpt (fd) == -1) \
194 { emacs_close (fd); return -1; } \
196 if (unlockpt (fd) == -1) \
197 { emacs_close (fd); return -1; } \
198 if (!(ptyname = ptsname (fd))) \
199 { emacs_close (fd); return -1; } \
200 strncpy (pty_name, ptyname, sizeof (pty_name)); \
201 pty_name[sizeof (pty_name) - 1] = 0; \
204 /* Push various streams modules onto a PTY channel. */
206 #define SETUP_SLAVE_PTY \
207 if (ioctl (xforkin, I_PUSH, "ptem") == -1) \
208 fatal ("ioctl I_PUSH ptem", errno); \
209 if (ioctl (xforkin, I_PUSH, "ldterm") == -1) \
210 fatal ("ioctl I_PUSH ldterm", errno); \
211 if (ioctl (xforkin, I_PUSH, "ttcompat") == -1) \
212 fatal ("ioctl I_PUSH ttcompat", errno);
214 /* This definition was suggested for next release.
218 /* arch-tag: 1a0ed909-5faa-434b-b7c3-9d86c63d53a6
219 (do not change this comment) */