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, 2002 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 #define GNU_LINUX
  35
  36 /* SYSTEM_TYPE should indicate the kind of system you are using.
  37  It sets the Lisp variable system-type.  */
  38
  39 #define SYSTEM_TYPE "gnu/linux"         /* All the best software is free. */
  40
  41 /* Check the version number of Linux--if it is at least 1.2.0,
  42    it is safe to use SIGIO.  */
  43 #ifndef NOT_C_CODE
  44 #ifdef emacs
  45 #ifdef HAVE_LINUX_VERSION_H
  46 #include <linux/version.h>
  47
  48 #if LINUX_VERSION_CODE > 0x10200
  49 #define LINUX_SIGIO_DOES_WORK
  50 #endif /* LINUX_VERSION_CODE > 0x10200 */
  51 #if LINUX_VERSION_CODE >= 0x20000
  52 #define LINUX_MAP_SHARED_DOES_WORK
  53 #endif /* LINUX_VERSION_CODE >= 0x20000 */
  54 #endif /* HAVE_LINUX_VERSION_H */
  55 #endif /* emacs */
  56 #endif /* NOT_C_CODE */
  57
  58 #if defined HAVE_GRANTPT
  59 #define UNIX98_PTYS
  60
  61 /* Run only once.  We need a `for'-loop because the code uses
  62    `continue'.  */
  63
  64 #define PTY_ITERATION   for (i = 0; i < 1; i++)
  65
  66 #ifdef HAVE_GETPT
  67 #define PTY_NAME_SPRINTF
  68 #define PTY_OPEN fd = getpt ()
  69 #else /* not HAVE_GETPT */
  70 #define PTY_NAME_SPRINTF strcpy (pty_name, "/dev/ptmx");
  71 #endif /* not HAVE_GETPT */
  72
  73 /* Note that grantpt and unlockpt may fork.  We must block SIGCHLD to
  74    prevent sigchld_handler from intercepting the child's death.  */
  75
  76 #define PTY_TTY_NAME_SPRINTF                            \
  77   {                                                     \
  78     char *ptyname;                                      \
  79                                                         \
  80     sigblock (sigmask (SIGCHLD));                       \
  81     if (grantpt (fd) == -1 || unlockpt (fd) == -1       \
  82         || !(ptyname = ptsname(fd)))                    \
  83       {                                                 \
  84         sigunblock (sigmask (SIGCHLD));                 \
  85         close (fd);                                     \
  86         return -1;                                      \
  87       }                                                 \
  88     strncpy (pty_name, ptyname, sizeof (pty_name));     \
  89     pty_name[sizeof (pty_name) - 1] = 0;                \
  90     sigunblock (sigmask (SIGCHLD));                     \
  91   }
  92
  93 #else /* not HAVE_GRANTPT */
  94
  95 /* Letter to use in finding device name of first pty,
  96    if system supports pty's.  'p' means it is /dev/ptyp0  */
  97
  98 #define FIRST_PTY_LETTER 'p'
  99
 100 #endif  /* not HAVE_GRANDPT */
 101
 102 /*  Define HAVE_TERMIOS if the system provides POSIX-style
 103     functions and macros for terminal control.  */
 104
 105 #define HAVE_TERMIOS
 106
 107 /* Define HAVE_PTYS if the system supports pty devices. */
 108
 109 #define HAVE_PTYS
 110
 111 #define HAVE_SOCKETS
 112
 113 /* Define this symbol if your system has the functions bcopy, etc. */
 114
 115 #define BSTRING
 116
 117 /* subprocesses should be defined if you want to
 118    have code for asynchronous subprocesses
 119    (as used in M-x compile and M-x shell).
 120    This is generally OS dependent, and not supported
 121    under most USG systems. */
 122
 123 #define subprocesses
 124
 125 /* define MAIL_USE_FLOCK if the mailer uses flock
 126    to interlock access to /usr/spool/mail/$USER.
 127    The alternative is that a lock file named
 128    /usr/spool/mail/$USER.lock.  */
 129
 130 /* On GNU/Linux systems, both methods are used by various mail
 131    programs.  I assume that most people are using newer mailers that
 132    have heard of flock.  Change this if you need to. */
 133 /* Debian contains a patch which says: ``On Debian/GNU/Linux systems,
 134    configure gets the right answers, and that means *NOT* using flock.
 135    Using flock is guaranteed to be the wrong thing. See Debian Policy
 136    for details.'' and then uses `#ifdef DEBIAN'.  Unfortunately the
 137    Debian maintainer hasn't provided a clean fix for Emacs.
 138    movemail.c will use `maillock' when MAILDIR, HAVE_LIBMAIL and
 139    HAVE_MAILLOCK_H are defined, so the following appears to be the
 140    correct logic.  -- fx */
 141
 142 #if !(defined (HAVE_LIBMAIL) && defined (HAVE_MAILLOCK_H))
 143 #define MAIL_USE_FLOCK
 144 #endif
 145
 146 /* Define CLASH_DETECTION if you want lock files to be written
 147    so that Emacs can tell instantly when you try to modify
 148    a file that someone else has modified in his Emacs.  */
 149
 150 #define CLASH_DETECTION
 151
 152 /* Here, on a separate page, add any special hacks needed
 153    to make Emacs work on this system.  For example,
 154    you might define certain system call names that don't
 155    exist on your system, or that do different things on
 156    your system and must be used only through an encapsulation
 157    (Which you should place, by convention, in sysdep.c).  */
 158 \f
 159 /* If you mount the proc file system somewhere other than /proc
 160    you will have to uncomment the following and make the proper
 161    changes */
 162
 163 /* #define LINUX_LDAV_FILE "/proc/loadavg" */
 164
 165 /* This is needed for dispnew.c:update_frame */
 166
 167 #ifdef emacs
 168 #include <stdio.h>  /* Get the definition of _IO_STDIO_H.  */
 169 #if defined(_IO_STDIO_H) || defined(_STDIO_USES_IOSTREAM)
 170 /* new C libio names */
 171 #define GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE) \
 172   ((FILE)->_IO_write_ptr - (FILE)->_IO_write_base)
 173 #else /* !_IO_STDIO_H */
 174 /* old C++ iostream names */
 175 #define GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE) \
 176   ((FILE)->_pptr - (FILE)->_pbase)
 177 #endif /* !_IO_STDIO_H */
 178 #endif /* emacs */
 179
 180 /* Ask GCC where to find libgcc.a.  */
 181 #define LIB_GCC `$(CC) $(C_SWITCH_X_SITE) -print-libgcc-file-name`
 182
 183 #ifndef __ELF__
 184 /* GNU/Linux usually has crt0.o in a non-standard place */
 185 #define START_FILES pre-crt0.o /usr/lib/crt0.o
 186 #else
 187 #define START_FILES pre-crt0.o /usr/lib/crt1.o /usr/lib/crti.o
 188 #endif
 189
 190 #ifdef __ELF__
 191 /* Here is how to find X Windows.  LD_SWITCH_X_SITE_AUX gives an -R option
 192    says where to find X windows at run time.  */
 193
 194 #ifdef __mips__
 195 #define LD_SWITCH_SYSTEM -G 0 LD_SWITCH_X_SITE_AUX
 196 #else
 197 #define LD_SWITCH_SYSTEM LD_SWITCH_X_SITE_AUX
 198 #endif /* __mips__ */
 199
 200 /* Link temacs with -z nocombreloc so that unexec works right, whether or
 201    not -z combreloc is the default.  GNU ld ignores unknown -z KEYWORD
 202    switches, so this also works with older versions that don't implement
 203    -z combreloc.  */
 204 #define LD_SWITCH_SYSTEM_TEMACS -z nocombreloc
 205 #endif /* __ELF__ */
 206
 207 /* As of version 1.1.51, Linux did not actually implement SIGIO.
 208    But it works in newer versions.  */
 209 #ifdef emacs
 210 #ifdef LINUX_SIGIO_DOES_WORK
 211 #define INTERRUPT_INPUT
 212 #else
 213 #define BROKEN_SIGIO
 214 /* Some versions of Linux define SIGURG and SIGPOLL as aliases for SIGIO.
 215    This prevents lossage in process.c.  */
 216 #define BROKEN_SIGURG
 217 #define BROKEN_SIGPOLL
 218 #endif
 219 #endif
 220
 221 /* This is needed for sysdep.c */
 222
 223 #define NO_SIOCTL_H           /* don't have sioctl.h */
 224
 225 #define HAVE_WAIT_HEADER
 226
 227 #define SYSV_SYSTEM_DIR       /* use dirent.h */
 228
 229 #define POSIX                 /* affects getpagesize.h and systty.h */
 230 #define POSIX_SIGNALS
 231
 232 /* Best not to include -lg, unless it is last on the command line */
 233 #define LIBS_DEBUG
 234 #ifndef __ELF__
 235 #define LIB_STANDARD -lc /* avoid -lPW */
 236 #else
 237 #undef LIB_GCC
 238 #define LIB_GCC
 239 #define LIB_STANDARD -lgcc -lc -lgcc /usr/lib/crtn.o
 240 #endif
 241
 242 /* Don't use -g in test compiles in configure.
 243    This is so we will use the same shared libs for that linking
 244    that are used when linking temacs.  */
 245 #ifdef THIS_IS_CONFIGURE
 246 #define C_DEBUG_SWITCH
 247 #endif
 248
 249 /* Let's try this out, just in case.
 250    Nah.  Rik Faith <faith@cs.unc.edu> says it doesn't work well.  */
 251 /* #define SIGNALS_VIA_CHARACTERS */
 252
 253 /* Rob Malouf <malouf@csli.stanford.edu> says:
 254    SYSV IPC is standard a standard part of Linux since version 0.99pl10,
 255    and is a very common addition to previous versions.  */
 256
 257 #ifdef TERM
 258 #define LIBS_SYSTEM -lclient
 259 #define C_SWITCH_SYSTEM -D_BSD_SOURCE -I/usr/src/term
 260 #else
 261 /* alane@wozzle.linet.org says that -lipc is not a separate library,
 262    since libc-4.4.1.  So -lipc was deleted.  */
 263 #define LIBS_SYSTEM
 264 /* _BSD_SOURCE is redundant, at least in glibc2, since we define
 265    _GNU_SOURCE.  Left in in case it's relevant to libc5 systems and
 266    anyone's still using Emacs on those.  --fx 2002-12-14  */
 267 #define C_SWITCH_SYSTEM -D_BSD_SOURCE
 268 #endif
 269
 270 /* Paul Abrahams <abrahams@equinox.shaysnet.com> says this is needed.  */
 271 #define LIB_MOTIF -lXm -lXpm
 272
 273 #ifdef HAVE_LIBNCURSES
 274 #define TERMINFO
 275 #define LIBS_TERMCAP -lncurses
 276 #endif
 277
 278 #define HAVE_SYSVIPC
 279
 280 #ifdef __ELF__
 281 #define UNEXEC unexelf.o
 282 #ifndef LINUX_MAP_SHARED_DOES_WORK
 283 #define UNEXEC_USE_MAP_PRIVATE
 284 #endif
 285 #endif
 286
 287 #ifdef LINUX_QMAGIC
 288
 289 #define HAVE_TEXT_START
 290 #define UNEXEC unexsunos4.o
 291 #define N_PAGSIZ(x) PAGE_SIZE
 292
 293 #else /* not LINUX_QMAGIC */
 294
 295 #define A_TEXT_OFFSET(hdr) (N_MAGIC(hdr) == QMAGIC ? sizeof (struct exec) : 0)
 296 #define A_TEXT_SEEK(hdr) (N_TXTOFF(hdr) + A_TEXT_OFFSET(hdr))
 297 #define ADJUST_EXEC_HEADER \
 298   unexec_text_start = N_TXTADDR(ohdr) + A_TEXT_OFFSET(ohdr)
 299
 300 #endif /* not LINUX_QMAGIC */
 301
 302 #if 0
 303 /* In 19.23 and 19.24, configure sometimes fails to define these.
 304    It has to do with the fact that configure uses CFLAGS when linking
 305    while Makefile.in.in (erroneously) fails to do so when linking temacs.  */
 306 #ifndef HAVE_GETTIMEOFDAY
 307 #define HAVE_GETTIMEOFDAY
 308 #endif
 309 #ifndef HAVE_MKDIR
 310 #define HAVE_MKDIR
 311 #endif
 312 #ifndef HAVE_RMDIR
 313 #define HAVE_RMDIR
 314 #endif
 315 #ifndef HAVE_XSCREENNUMBEROFSCREEN
 316 #define HAVE_XSCREENNUMBEROFSCREEN
 317 #endif
 318 #endif /* 0 */
 319
 320 /* This is to work around mysterious gcc failures in some system versions.
 321    It is unlikely that Emacs changes will work around this problem;
 322    therefore, this should remain permanently.  */
 323 #ifndef HAVE_XRMSETDATABASE
 324 #define HAVE_XRMSETDATABASE
 325 #endif
 326
 327 /* The regex.o routines are a part of the GNU C-library used with Linux.  */
 328 /* However, sometimes they disagree with the src/regex.h that comes with Emacs,
 329    and that can make trouble in etags.c because it gets the regex.h from Emacs
 330    and the function definitions in libc.  So turn this off.  */
 331 /* #define REGEXP_IN_LIBC */
 332
 333 /* Use BSD process groups, but use setpgid() instead of setpgrp() to
 334    actually set a process group. */
 335
 336 #define BSD_PGRPS
 337
 338 #define NARROWPROTO 1
 339
 340 /* Use mmap directly for allocating larger buffers.  */
 341 #ifdef DOUG_LEA_MALLOC
 342 #undef REL_ALLOC
 343 #endif
 344
 345 /* Tell that garbage collector that setjmp is known to save all
 346    registers relevant for conservative garbage collection in the
 347    jmp_buf.  */
 348 /* Not all the architectures are tested, but there are Debian packages
 349    for SCM and/or Guile on them, so the technique must work.  See also
 350    comments in alloc.c concerning setjmp and gcc.  Fixme:  it's
 351    probably safe to make this conditional just on GCC, except for ia64
 352    register window-flushing.  */
 353 /* Don't use #cpu here since in newest development versions of GCC,
 354    we must call cpp with -traditional, and that disables #cpu.  */
 355
 356 #if defined __i386__ || defined __sparc__ || defined __mc68000__ \
 357     || defined __alpha__ || defined __mips__ || defined __s390__ \
 358     || defined __arm__ || defined __powerpc__
 359 #define GC_SETJMP_WORKS 1
 360 #define GC_MARK_STACK GC_MAKE_GCPROS_NOOPS
 361 #ifdef __mc68000__
 362 #define GC_LISP_OBJECT_ALIGNMENT 2
 363 #endif
 364 #endif
 365
 366 /* arch-tag: 6244ea2a-abd0-44ec-abec-ff3dcc9afea9
 367    (do not change this comment) */