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