code.delx.au - gnu-emacs/blob - src/s/gnu-linux.h

   1 /* This file is the configuration file for Linux-based GNU systems
   2    Copyright (C) 1985, 86, 92, 94, 96, 1999 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Emacs.
   5
   6 GNU Emacs is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Emacs is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Emacs; see the file COPYING.  If not, write to
  18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21 /* This file was put together by Michael K. Johnson and Rik Faith.  */
  22
  23
  24 /*
  25  *      Define symbols to identify the version of Unix this is.
  26  *      Define all the symbols that apply correctly.
  27  */
  28
  29 /* #define UNIPLUS */
  30 /* #define USG5 */
  31 #define USG
  32 /* #define BSD_SYSTEM */
  33 #define LINUX
  34
  35 /* SYSTEM_TYPE should indicate the kind of system you are using.
  36  It sets the Lisp variable system-type.  */
  37
  38 #define SYSTEM_TYPE "gnu/linux"         /* All the best software is free. */
  39
  40 /* Check the version number of Linux--if it is at least 1.2.0,
  41    it is safe to use SIGIO.  */
  42 #ifndef NOT_C_CODE
  43 #ifdef emacs
  44 #ifdef HAVE_LINUX_VERSION_H
  45 #include <linux/version.h>
  46
  47 #if LINUX_VERSION_CODE > 0x10200
  48 #define LINUX_SIGIO_DOES_WORK
  49 #endif /* LINUX_VERSION_CODE > 0x10200 */
  50 #if LINUX_VERSION_CODE >= 0x20000
  51 #define LINUX_MAP_SHARED_DOES_WORK
  52 #endif /* LINUX_VERSION_CODE >= 0x20000 */
  53 #endif /* HAVE_LINUX_VERSION_H */
  54 #endif /* emacs */
  55 #endif /* NOT_C_CODE */
  56
  57 #if defined HAVE_GRANTPT
  58 #define UNIX98_PTYS
  59
  60 /* Run only once.  We need a `for'-loop because the code uses
  61    `continue'.  */
  62
  63 #define PTY_ITERATION   for (i = 0; i < 1; i++)
  64
  65 #ifdef HAVE_GETPT
  66 #define PTY_NAME_SPRINTF
  67 #define PTY_OPEN fd = getpt ()
  68 #else /* not HAVE_GETPT */
  69 #define PTY_NAME_SPRINTF strcpy (pty_name, "/dev/ptmx");
  70 #endif /* not HAVE_GETPT */
  71
  72 /* Note that grantpt and unlockpt may fork.  We must block SIGCHLD to
  73    prevent sigchld_handler from intercepting the child's death.  */
  74
  75 #define PTY_TTY_NAME_SPRINTF                            \
  76   {                                                     \
  77     char *ptyname;                                      \
  78                                                         \
  79     sigblock (sigmask (SIGCHLD));                       \
  80     if (grantpt (fd) == -1 || unlockpt (fd) == -1       \
  81         || !(ptyname = ptsname(fd)))                    \
  82       {                                                 \
  83         sigunblock (sigmask (SIGCHLD));                 \
  84         close (fd);                                     \
  85         return -1;                                      \
  86       }                                                 \
  87     strncpy (pty_name, ptyname, sizeof (pty_name));     \
  88     pty_name[sizeof (pty_name) - 1] = 0;                \
  89     sigunblock (sigmask (SIGCHLD));                     \
  90   }
  91
  92 #else /* not HAVE_GRANDPT */
  93
  94 /* Letter to use in finding device name of first pty,
  95    if system supports pty's.  'p' means it is /dev/ptyp0  */
  96
  97 #define FIRST_PTY_LETTER 'p'
  98
  99 #endif  /* not HAVE_GRANDPT */
 100
 101 /*  Define HAVE_TERMIOS if the system provides POSIX-style
 102     functions and macros for terminal control.  */
 103
 104 #define HAVE_TERMIOS
 105
 106 /* Define HAVE_PTYS if the system supports pty devices. */
 107
 108 #define HAVE_PTYS
 109
 110 /* Uncomment this later when other problems are dealt with -mkj */
 111
 112 #define HAVE_SOCKETS
 113
 114 /* Define this symbol if your system has the functions bcopy, etc. */
 115
 116 #define BSTRING
 117
 118 /* subprocesses should be defined if you want to
 119    have code for asynchronous subprocesses
 120    (as used in M-x compile and M-x shell).
 121    This is generally OS dependent, and not supported
 122    under most USG systems. */
 123
 124 #define subprocesses
 125
 126 /* define MAIL_USE_FLOCK if the mailer uses flock
 127    to interlock access to /usr/spool/mail/$USER.
 128    The alternative is that a lock file named
 129    /usr/spool/mail/$USER.lock.  */
 130
 131 /* On GNU/Linux systems, both methods are used by various mail
 132    programs.  I assume that most people are using newer mailers that
 133    have heard of flock.  Change this if you need to. */
 134
 135 #define MAIL_USE_FLOCK
 136
 137 /* Define CLASH_DETECTION if you want lock files to be written
 138    so that Emacs can tell instantly when you try to modify
 139    a file that someone else has modified in his Emacs.  */
 140
 141 #define CLASH_DETECTION
 142
 143 /* Here, on a separate page, add any special hacks needed
 144    to make Emacs work on this system.  For example,
 145    you might define certain system call names that don't
 146    exist on your system, or that do different things on
 147    your system and must be used only through an encapsulation
 148    (Which you should place, by convention, in sysdep.c).  */
 149 \f
 150 /* If you mount the proc file system somewhere other than /proc
 151    you will have to uncomment the following and make the proper
 152    changes */
 153
 154 /* #define LINUX_LDAV_FILE "/proc/loadavg" */
 155
 156 /* This is needed for dispnew.c:update_frame */
 157
 158 #ifdef emacs
 159 #include <stdio.h>  /* Get the definition of _IO_STDIO_H.  */
 160 #if defined(_IO_STDIO_H) || defined(_STDIO_USES_IOSTREAM)
 161 /* new C libio names */
 162 #define GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE) \
 163   ((FILE)->_IO_write_ptr - (FILE)->_IO_write_base)
 164 #else /* !_IO_STDIO_H */
 165 /* old C++ iostream names */
 166 #define GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE) \
 167   ((FILE)->_pptr - (FILE)->_pbase)
 168 #endif /* !_IO_STDIO_H */
 169 #endif /* emacs */
 170
 171 /* Ask GCC where to find libgcc.a.  */
 172 #define LIB_GCC `$(CC) $(C_SWITCH_X_SITE) -print-libgcc-file-name`
 173
 174 #ifndef __ELF__
 175 /* GNU/Linux usually has crt0.o in a non-standard place */
 176 #define START_FILES pre-crt0.o /usr/lib/crt0.o
 177 #else
 178 #define START_FILES pre-crt0.o /usr/lib/crt1.o /usr/lib/crti.o
 179 #endif
 180
 181 #ifdef __ELF__
 182 /* Here is how to find X Windows.  LD_SWITCH_X_SITE_AUX gives an -R option
 183    says where to find X windows at run time.  */
 184
 185 #ifdef __mips__
 186 #define LD_SWITCH_SYSTEM -G 0 LD_SWITCH_X_SITE_AUX
 187 #else
 188 #define LD_SWITCH_SYSTEM LD_SWITCH_X_SITE_AUX
 189 #endif /* __mips__ */
 190 #endif /* __ELF__ */
 191
 192 /* As of version 1.1.51, Linux did not actually implement SIGIO.
 193    But it works in newer versions.  */
 194 #ifdef emacs
 195 #ifdef LINUX_SIGIO_DOES_WORK
 196 #define INTERRUPT_INPUT
 197 #else
 198 #define BROKEN_SIGIO
 199 /* Some versions of Linux define SIGURG and SIGPOLL as aliases for SIGIO.
 200    This prevents lossage in process.c.  */
 201 #define BROKEN_SIGURG
 202 #define BROKEN_SIGPOLL
 203 #endif
 204 #endif
 205
 206 /* This is needed for sysdep.c */
 207
 208 #define NO_SIOCTL_H           /* don't have sioctl.h */
 209
 210 #define HAVE_WAIT_HEADER
 211
 212 #define SYSV_SYSTEM_DIR       /* use dirent.h */
 213
 214 #define POSIX                 /* affects getpagesize.h and systty.h */
 215 #define POSIX_SIGNALS
 216
 217 /* Best not to include -lg, unless it is last on the command line */
 218 #define LIBS_DEBUG
 219 #ifndef __ELF__
 220 #define LIB_STANDARD -lc /* avoid -lPW */
 221 #else
 222 #undef LIB_GCC
 223 #define LIB_GCC
 224 #define LIB_STANDARD -lgcc -lc -lgcc /usr/lib/crtn.o
 225 #endif
 226
 227 /* Don't use -g in test compiles in configure.
 228    This is so we will use the same shared libs for that linking
 229    that are used when linking temacs.  */
 230 #ifdef THIS_IS_CONFIGURE
 231 #define C_DEBUG_SWITCH
 232 #endif
 233
 234 /* Let's try this out, just in case.
 235    Nah.  Rik Faith <faith@cs.unc.edu> says it doesn't work well.  */
 236 /* #define SIGNALS_VIA_CHARACTERS */
 237
 238 /* Rob Malouf <malouf@csli.stanford.edu> says:
 239    SYSV IPC is standard a standard part of Linux since version 0.99pl10,
 240    and is a very common addition to previous versions.  */
 241
 242 #ifdef TERM
 243 #define LIBS_SYSTEM -lclient
 244 #define C_SWITCH_SYSTEM -D_BSD_SOURCE -I/usr/src/term
 245 #else
 246 /* alane@wozzle.linet.org says that -lipc is not a separate library,
 247    since libc-4.4.1.  So -lipc was deleted.  */
 248 #define LIBS_SYSTEM
 249 #define C_SWITCH_SYSTEM -D_BSD_SOURCE
 250 #endif
 251
 252 /* Paul Abrahams <abrahams@equinox.shaysnet.com> says this is needed.  */
 253 #define LIB_MOTIF -lXm -lXpm
 254
 255 #ifdef HAVE_LIBNCURSES
 256 #define TERMINFO
 257 #define LIBS_TERMCAP -lncurses
 258 #endif
 259
 260 #define HAVE_SYSVIPC
 261
 262 #ifdef __ELF__
 263 #define UNEXEC unexelf.o
 264 #ifndef LINUX_MAP_SHARED_DOES_WORK
 265 #define UNEXEC_USE_MAP_PRIVATE
 266 #endif
 267 #endif
 268
 269 #ifdef LINUX_QMAGIC
 270
 271 #define HAVE_TEXT_START
 272 #define UNEXEC unexsunos4.o
 273 #define N_PAGSIZ(x) PAGE_SIZE
 274
 275 #else /* not LINUX_QMAGIC */
 276
 277 #define A_TEXT_OFFSET(hdr) (N_MAGIC(hdr) == QMAGIC ? sizeof (struct exec) : 0)
 278 #define A_TEXT_SEEK(hdr) (N_TXTOFF(hdr) + A_TEXT_OFFSET(hdr))
 279 #define ADJUST_EXEC_HEADER \
 280   unexec_text_start = N_TXTADDR(ohdr) + A_TEXT_OFFSET(ohdr)
 281
 282 #endif /* not LINUX_QMAGIC */
 283
 284 #if 0
 285 /* In 19.23 and 19.24, configure sometimes fails to define these.
 286    It has to do with the fact that configure uses CFLAGS when linking
 287    while Makefile.in.in (erroneously) fails to do so when linking temacs.  */
 288 #ifndef HAVE_GETTIMEOFDAY
 289 #define HAVE_GETTIMEOFDAY
 290 #endif
 291 #ifndef HAVE_MKDIR
 292 #define HAVE_MKDIR
 293 #endif
 294 #ifndef HAVE_RMDIR
 295 #define HAVE_RMDIR
 296 #endif
 297 #ifndef HAVE_XSCREENNUMBEROFSCREEN
 298 #define HAVE_XSCREENNUMBEROFSCREEN
 299 #endif
 300 #endif /* 0 */
 301
 302 /* This is to work around mysterious gcc failures in some system versions.
 303    It is unlikely that Emacs changes will work around this problem;
 304    therefore, this should remain permanently.  */
 305 #ifndef HAVE_XRMSETDATABASE
 306 #define HAVE_XRMSETDATABASE
 307 #endif
 308
 309 /* The regex.o routines are a part of the GNU C-library used with Linux.  */
 310 /* However, sometimes they disagree with the src/regex.h that comes with Emacs,
 311    and that can make trouble in etags.c because it gets the regex.h from Emacs
 312    and the function definitions in libc.  So turn this off.  */
 313 /* #define REGEXP_IN_LIBC */
 314
 315 /* Use BSD process groups, but use setpgid() instead of setpgrp() to
 316    actually set a process group. */
 317
 318 #define BSD_PGRPS
 319
 320 #define NARROWPROTO 1
 321
 322 /* Use mmap directly for allocating larger buffers.  */
 323 #ifdef DOUG_LEA_MALLOC
 324 #undef REL_ALLOC
 325 #endif
 326
 327 /* Tell that garbage collector that setjmp is known to save all
 328    registers relevant for conservative garbage collection in the
 329    jmp_buf.  */
 330 /* m68k and alpha aren't tested, but there are Debian packages for SCM
 331    and/or Guile on them, so the technique must work.  */
 332
 333 /* Don't use #cpu here since in newest development versions of GCC,
 334    we must call cpp with -traditional, and that disables #cpu.  */
 335
 336 #if defined __i386__ || defined __sparc__ || defined __m68k__ || defined __alpha__
 337 #define GC_SETJMP_WORKS 1
 338 #define GC_MARK_STACK GC_MAKE_GCPROS_NOOPS
 339 #endif