src/s/gnu-linux.h

   1 /* This file is the configuration file for Linux-based GNU systems
   2    Copyright (C) 1985, 1986, 1992, 1994, 1996, 1999, 2002, 2003, 2004,
   3                  2005, 2006 Free Software 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 2, or (at your option)
  10 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; see the file COPYING.  If not, write to
  19 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  20 Boston, MA 02110-1301, USA.  */
  21
  22 /* This file was put together by Michael K. Johnson and Rik Faith.  */
  23
  24
  25 /*
  26  *      Define symbols to identify the version of Unix this is.
  27  *      Define all the symbols that apply correctly.
  28  */
  29
  30 /* #define UNIPLUS */
  31 /* #define USG5 */
  32 #define USG
  33 /* #define BSD_SYSTEM */
  34 #define LINUX
  35 #define GNU_LINUX
  36
  37 /* SYSTEM_TYPE should indicate the kind of system you are using.
  38  It sets the Lisp variable system-type.  */
  39
  40 #define SYSTEM_TYPE "gnu/linux"         /* All the best software is free. */
  41
  42 /* Check the version number of Linux--if it is at least 1.2.0,
  43    it is safe to use SIGIO.  */
  44 #ifndef NOT_C_CODE
  45 #ifdef emacs
  46 #ifdef HAVE_LINUX_VERSION_H
  47 #include <linux/version.h>
  48
  49 #if LINUX_VERSION_CODE > 0x10200
  50 #define LINUX_SIGIO_DOES_WORK
  51 #endif /* LINUX_VERSION_CODE > 0x10200 */
  52 #if LINUX_VERSION_CODE >= 0x20000
  53 #define LINUX_MAP_SHARED_DOES_WORK
  54 #endif /* LINUX_VERSION_CODE >= 0x20000 */
  55 #if LINUX_VERSION_CODE >= 0x20400
  56 #define LINUX_SIGNALS_VIA_CHARACTERS_DOES_WORK
  57 #endif /* LINUX_VERSION_CODE >= 0x20400 */
  58 #endif /* HAVE_LINUX_VERSION_H */
  59 #endif /* emacs */
  60 #endif /* NOT_C_CODE */
  61
  62 #if defined HAVE_GRANTPT
  63 #define UNIX98_PTYS
  64
  65 /* Run only once.  We need a `for'-loop because the code uses
  66    `continue'.  */
  67
  68 #define PTY_ITERATION   for (i = 0; i < 1; i++)
  69
  70 #ifdef HAVE_GETPT
  71 #define PTY_NAME_SPRINTF
  72 #define PTY_OPEN fd = getpt ()
  73 #else /* not HAVE_GETPT */
  74 #define PTY_NAME_SPRINTF strcpy (pty_name, "/dev/ptmx");
  75 #endif /* not HAVE_GETPT */
  76
  77 /* Note that grantpt and unlockpt may fork.  We must block SIGCHLD to
  78    prevent sigchld_handler from intercepting the child's death.  */
  79
  80 #define PTY_TTY_NAME_SPRINTF                            \
  81   {                                                     \
  82     char *ptyname;                                      \
  83                                                         \
  84     sigblock (sigmask (SIGCHLD));                       \
  85     if (grantpt (fd) == -1 || unlockpt (fd) == -1       \
  86         || !(ptyname = ptsname(fd)))                    \
  87       {                                                 \
  88         sigunblock (sigmask (SIGCHLD));                 \
  89         close (fd);                                     \
  90         return -1;                                      \
  91       }                                                 \
  92     strncpy (pty_name, ptyname, sizeof (pty_name));     \
  93     pty_name[sizeof (pty_name) - 1] = 0;                \
  94     sigunblock (sigmask (SIGCHLD));                     \
  95   }
  96
  97 #else /* not HAVE_GRANTPT */
  98
  99 /* Letter to use in finding device name of first pty,
 100    if system supports pty's.  'p' means it is /dev/ptyp0  */
 101
 102 #define FIRST_PTY_LETTER 'p'
 103
 104 #endif  /* not HAVE_GRANDPT */
 105
 106 /*  Define HAVE_TERMIOS if the system provides POSIX-style
 107     functions and macros for terminal control.  */
 108
 109 #define HAVE_TERMIOS
 110
 111 /* Define HAVE_PTYS if the system supports pty devices. */
 112
 113 #define HAVE_PTYS
 114
 115 #define HAVE_SOCKETS
 116
 117 /* Define this symbol if your system has the functions bcopy, etc. */
 118
 119 #define BSTRING
 120
 121 /* subprocesses should be defined if you want to
 122    have code for asynchronous subprocesses
 123    (as used in M-x compile and M-x shell).
 124    This is generally OS dependent, and not supported
 125    under most USG systems. */
 126
 127 #define subprocesses
 128
 129 /* define MAIL_USE_FLOCK if the mailer uses flock
 130    to interlock access to /usr/spool/mail/$USER.
 131    The alternative is that a lock file named
 132    /usr/spool/mail/$USER.lock.  */
 133
 134 /* On GNU/Linux systems, both methods are used by various mail
 135    programs.  I assume that most people are using newer mailers that
 136    have heard of flock.  Change this if you need to. */
 137 /* Debian contains a patch which says: ``On Debian/GNU/Linux systems,
 138    configure gets the right answers, and that means *NOT* using flock.
 139    Using flock is guaranteed to be the wrong thing. See Debian Policy
 140    for details.'' and then uses `#ifdef DEBIAN'.  Unfortunately the
 141    Debian maintainer hasn't provided a clean fix for Emacs.
 142    movemail.c will use `maillock' when MAILDIR, HAVE_LIBMAIL and
 143    HAVE_MAILLOCK_H are defined, so the following appears to be the
 144    correct logic.  -- fx */
 145 /* We must check for HAVE_LIBLOCKFILE too, as movemail does.
 146    liblockfile is a Free Software replacement for libmail, used on
 147    Debian systems and elsewhere. -rfr */
 148
 149 #if !((defined (HAVE_LIBMAIL) || defined (HAVE_LIBLOCKFILE)) && \
 150       defined (HAVE_MAILLOCK_H))
 151 #define MAIL_USE_FLOCK
 152 #endif
 153
 154 /* Define CLASH_DETECTION if you want lock files to be written
 155    so that Emacs can tell instantly when you try to modify
 156    a file that someone else has modified in his Emacs.  */
 157
 158 #define CLASH_DETECTION
 159
 160 /* Here, on a separate page, add any special hacks needed
 161    to make Emacs work on this system.  For example,
 162    you might define certain system call names that don't
 163    exist on your system, or that do different things on
 164    your system and must be used only through an encapsulation
 165    (Which you should place, by convention, in sysdep.c).  */
 166 \f
 167 /* If you mount the proc file system somewhere other than /proc
 168    you will have to uncomment the following and make the proper
 169    changes */
 170
 171 /* #define LINUX_LDAV_FILE "/proc/loadavg" */
 172
 173 /* This is needed for dispnew.c:update_frame */
 174
 175 #ifdef emacs
 176 #include <stdio.h>  /* Get the definition of _IO_STDIO_H.  */
 177 #if defined(_IO_STDIO_H) || defined(_STDIO_USES_IOSTREAM)
 178 /* new C libio names */
 179 #define GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE) \
 180   ((FILE)->_IO_write_ptr - (FILE)->_IO_write_base)
 181 #else /* !_IO_STDIO_H */
 182 /* old C++ iostream names */
 183 #define GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE) \
 184   ((FILE)->_pptr - (FILE)->_pbase)
 185 #endif /* !_IO_STDIO_H */
 186 #endif /* emacs */
 187
 188 /* Ask GCC where to find libgcc.a.  */
 189 #define LIB_GCC `$(CC) $(C_SWITCH_X_SITE) -print-libgcc-file-name`
 190
 191 #ifndef __ELF__
 192 /* GNU/Linux usually has crt0.o in a non-standard place */
 193 #define START_FILES pre-crt0.o /usr/lib/crt0.o
 194 #else
 195 #define START_FILES pre-crt0.o /usr/lib/crt1.o /usr/lib/crti.o
 196 #endif
 197
 198 #ifdef __ELF__
 199 /* Here is how to find X Windows.  LD_SWITCH_X_SITE_AUX gives an -R option
 200    says where to find X windows at run time.  */
 201
 202 #ifdef __mips__
 203 #define LD_SWITCH_SYSTEM -G 0 LD_SWITCH_X_SITE_AUX
 204 #else
 205 #define LD_SWITCH_SYSTEM LD_SWITCH_X_SITE_AUX
 206 #endif /* __mips__ */
 207
 208 /* Link temacs with -z nocombreloc so that unexec works right, whether or
 209    not -z combreloc is the default.  GNU ld ignores unknown -z KEYWORD
 210    switches, so this also works with older versions that don't implement
 211    -z combreloc.  */
 212 #define LD_SWITCH_SYSTEM_TEMACS -z nocombreloc
 213 #endif /* __ELF__ */
 214
 215 /* As of version 1.1.51, Linux did not actually implement SIGIO.
 216    But it works in newer versions.  */
 217 #ifdef emacs
 218 #ifdef LINUX_SIGIO_DOES_WORK
 219 #define INTERRUPT_INPUT
 220 #else
 221 #define BROKEN_SIGIO
 222 /* Some versions of Linux define SIGURG and SIGPOLL as aliases for SIGIO.
 223    This prevents lossage in process.c.  */
 224 #define BROKEN_SIGURG
 225 #define BROKEN_SIGPOLL
 226 #endif
 227 #endif
 228
 229 /* This is needed for sysdep.c */
 230
 231 #define NO_SIOCTL_H           /* don't have sioctl.h */
 232
 233 #define HAVE_WAIT_HEADER
 234
 235 #define SYSV_SYSTEM_DIR       /* use dirent.h */
 236
 237 #define POSIX                 /* affects getpagesize.h and systty.h */
 238 #define POSIX_SIGNALS
 239
 240 /* Best not to include -lg, unless it is last on the command line */
 241 #define LIBS_DEBUG
 242 #ifndef __ELF__
 243 #define LIB_STANDARD -lc /* avoid -lPW */
 244 #else
 245 #undef LIB_GCC
 246 #define LIB_GCC
 247 #define LIB_STANDARD -lgcc -lc -lgcc /usr/lib/crtn.o
 248 #endif
 249
 250 /* Don't use -g in test compiles in configure.
 251    This is so we will use the same shared libs for that linking
 252    that are used when linking temacs.  */
 253 #ifdef THIS_IS_CONFIGURE
 254 #define C_DEBUG_SWITCH
 255 #endif
 256
 257 /* 21 Jun 06: Eric Hanchrow <offby1@blarg.net> says this works.  */
 258 #ifdef LINUX_SIGNALS_VIA_CHARACTERS_DOES_WORK
 259 #define SIGNALS_VIA_CHARACTERS
 260 #endif
 261
 262 /* Rob Malouf <malouf@csli.stanford.edu> says:
 263    SYSV IPC is standard a standard part of Linux since version 0.99pl10,
 264    and is a very common addition to previous versions.  */
 265
 266 #ifdef TERM
 267 #define LIBS_SYSTEM -lclient
 268 #define C_SWITCH_SYSTEM -D_BSD_SOURCE -I/usr/src/term
 269 #else
 270 /* alane@wozzle.linet.org says that -lipc is not a separate library,
 271    since libc-4.4.1.  So -lipc was deleted.  */
 272 #define LIBS_SYSTEM
 273 /* _BSD_SOURCE is redundant, at least in glibc2, since we define
 274    _GNU_SOURCE.  Left in in case it's relevant to libc5 systems and
 275    anyone's still using Emacs on those.  --fx 2002-12-14  */
 276 #define C_SWITCH_SYSTEM -D_BSD_SOURCE
 277 #endif
 278
 279 /* Paul Abrahams <abrahams@equinox.shaysnet.com> says this is needed.  */
 280 #define LIB_MOTIF -lXm -lXpm
 281
 282 #ifdef HAVE_LIBNCURSES
 283 #define TERMINFO
 284 #define LIBS_TERMCAP -lncurses
 285 #endif
 286
 287 #define HAVE_SYSVIPC
 288
 289 #ifdef __ELF__
 290 #define UNEXEC unexelf.o
 291 #ifndef LINUX_MAP_SHARED_DOES_WORK
 292 #define UNEXEC_USE_MAP_PRIVATE
 293 #endif
 294 #endif
 295
 296 #ifdef LINUX_QMAGIC
 297
 298 #define HAVE_TEXT_START
 299 #define UNEXEC unexsunos4.o
 300 #define N_PAGSIZ(x) PAGE_SIZE
 301
 302 #else /* not LINUX_QMAGIC */
 303
 304 #define A_TEXT_OFFSET(hdr) (N_MAGIC(hdr) == QMAGIC ? sizeof (struct exec) : 0)
 305 #define A_TEXT_SEEK(hdr) (N_TXTOFF(hdr) + A_TEXT_OFFSET(hdr))
 306 #define ADJUST_EXEC_HEADER \
 307   unexec_text_start = N_TXTADDR(ohdr) + A_TEXT_OFFSET(ohdr)
 308
 309 #endif /* not LINUX_QMAGIC */
 310
 311 #if 0
 312 /* In 19.23 and 19.24, configure sometimes fails to define these.
 313    It has to do with the fact that configure uses CFLAGS when linking
 314    while Makefile.in.in (erroneously) fails to do so when linking temacs.  */
 315 #ifndef HAVE_GETTIMEOFDAY
 316 #define HAVE_GETTIMEOFDAY
 317 #endif
 318 #ifndef HAVE_MKDIR
 319 #define HAVE_MKDIR
 320 #endif
 321 #ifndef HAVE_RMDIR
 322 #define HAVE_RMDIR
 323 #endif
 324 #ifndef HAVE_XSCREENNUMBEROFSCREEN
 325 #define HAVE_XSCREENNUMBEROFSCREEN
 326 #endif
 327 #endif /* 0 */
 328
 329 /* This is to work around mysterious gcc failures in some system versions.
 330    It is unlikely that Emacs changes will work around this problem;
 331    therefore, this should remain permanently.  */
 332 #ifndef HAVE_XRMSETDATABASE
 333 #define HAVE_XRMSETDATABASE
 334 #endif
 335
 336 /* The regex.o routines are a part of the GNU C-library used with Linux.  */
 337 /* However, sometimes they disagree with the src/regex.h that comes with Emacs,
 338    and that can make trouble in etags.c because it gets the regex.h from Emacs
 339    and the function definitions in libc.  So turn this off.  */
 340 /* #define REGEXP_IN_LIBC */
 341
 342 /* Use BSD process groups, but use setpgid() instead of setpgrp() to
 343    actually set a process group. */
 344
 345 #define BSD_PGRPS
 346
 347 #define NARROWPROTO 1
 348
 349 /* Use mmap directly for allocating larger buffers.  */
 350 #ifdef DOUG_LEA_MALLOC
 351 #undef REL_ALLOC
 352 #endif
 353
 354 /* Tell that garbage collector that setjmp is known to save all
 355    registers relevant for conservative garbage collection in the
 356    jmp_buf.  */
 357 /* Not all the architectures are tested, but there are Debian packages
 358    for SCM and/or Guile on them, so the technique must work.  See also
 359    comments in alloc.c concerning setjmp and gcc.  Fixme:  it's
 360    probably safe to make this conditional just on GCC, except for ia64
 361    register window-flushing.  */
 362 /* Don't use #cpu here since in newest development versions of GCC,
 363    we must call cpp with -traditional, and that disables #cpu.  */
 364
 365 #if defined __i386__ || defined __sparc__ || defined __mc68000__ \
 366     || defined __alpha__ || defined __mips__ || defined __s390__ \
 367     || defined __arm__ || defined __powerpc__ || defined __amd64__ \
 368     || defined __ia64__
 369 #define GC_SETJMP_WORKS 1
 370 #define GC_MARK_STACK GC_MAKE_GCPROS_NOOPS
 371 #ifdef __mc68000__
 372 #define GC_LISP_OBJECT_ALIGNMENT 2
 373 #endif
 374 #ifdef __ia64__
 375 #define GC_MARK_SECONDARY_STACK()                               \
 376   do {                                                          \
 377     extern void *__libc_ia64_register_backing_store_base;       \
 378     __builtin_ia64_flushrs ();                                  \
 379     mark_memory (__libc_ia64_register_backing_store_base,       \
 380                  __builtin_ia64_bsp (), 0);                     \
 381   } while (0)
 382 #endif
 383 #endif
 384
 385 /* arch-tag: 6244ea2a-abd0-44ec-abec-ff3dcc9afea9
 386    (do not change this comment) */