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, 2001, 2002, 2003, 2004,
   3                  2005, 2006, 2007, 2008  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 3, 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 #ifndef NOT_C_CODE
  43 #ifdef emacs
  44 #ifdef HAVE_LINUX_VERSION_H
  45 #include <linux/version.h>
  46
  47 #if LINUX_VERSION_CODE >= 0x20400
  48 #define LINUX_SIGNALS_VIA_CHARACTERS_DOES_WORK
  49 #endif /* LINUX_VERSION_CODE >= 0x20400 */
  50 #endif /* HAVE_LINUX_VERSION_H */
  51 #endif /* emacs */
  52 #endif /* NOT_C_CODE */
  53
  54 #if defined HAVE_GRANTPT
  55 #define UNIX98_PTYS
  56
  57 /* Run only once.  We need a `for'-loop because the code uses
  58    `continue'.  */
  59
  60 #define PTY_ITERATION   for (i = 0; i < 1; i++)
  61
  62 #ifdef HAVE_GETPT
  63 #define PTY_NAME_SPRINTF
  64 #define PTY_OPEN fd = getpt ()
  65 #else /* not HAVE_GETPT */
  66 #define PTY_NAME_SPRINTF strcpy (pty_name, "/dev/ptmx");
  67 #endif /* not HAVE_GETPT */
  68
  69 /* Note that grantpt and unlockpt may fork.  We must block SIGCHLD to
  70    prevent sigchld_handler from intercepting the child's death.  */
  71
  72 #define PTY_TTY_NAME_SPRINTF                            \
  73   {                                                     \
  74     char *ptyname;                                      \
  75                                                         \
  76     sigblock (sigmask (SIGCHLD));                       \
  77     if (grantpt (fd) == -1 || unlockpt (fd) == -1       \
  78         || !(ptyname = ptsname(fd)))                    \
  79       {                                                 \
  80         sigunblock (sigmask (SIGCHLD));                 \
  81         close (fd);                                     \
  82         return -1;                                      \
  83       }                                                 \
  84     strncpy (pty_name, ptyname, sizeof (pty_name));     \
  85     pty_name[sizeof (pty_name) - 1] = 0;                \
  86     sigunblock (sigmask (SIGCHLD));                     \
  87   }
  88
  89 #else /* not HAVE_GRANTPT */
  90
  91 /* Letter to use in finding device name of first pty,
  92    if system supports pty's.  'p' means it is /dev/ptyp0  */
  93
  94 #define FIRST_PTY_LETTER 'p'
  95
  96 #endif  /* not HAVE_GRANDPT */
  97
  98 /*  Define HAVE_TERMIOS if the system provides POSIX-style
  99     functions and macros for terminal control.  */
 100
 101 #define HAVE_TERMIOS
 102
 103 /* Define HAVE_PTYS if the system supports pty devices. */
 104
 105 #define HAVE_PTYS
 106
 107 #define HAVE_SOCKETS
 108
 109 /* Define this symbol if your system has the functions bcopy, etc. */
 110
 111 #define BSTRING
 112
 113 /* subprocesses should be defined if you want to
 114    have code for asynchronous subprocesses
 115    (as used in M-x compile and M-x shell).
 116    This is generally OS dependent, and not supported
 117    under most USG systems. */
 118
 119 #define subprocesses
 120
 121 /* define MAIL_USE_FLOCK if the mailer uses flock
 122    to interlock access to /usr/spool/mail/$USER.
 123    The alternative is that a lock file named
 124    /usr/spool/mail/$USER.lock.  */
 125
 126 /* On GNU/Linux systems, both methods are used by various mail
 127    programs.  I assume that most people are using newer mailers that
 128    have heard of flock.  Change this if you need to. */
 129 /* Debian contains a patch which says: ``On Debian/GNU/Linux systems,
 130    configure gets the right answers, and that means *NOT* using flock.
 131    Using flock is guaranteed to be the wrong thing. See Debian Policy
 132    for details.'' and then uses `#ifdef DEBIAN'.  Unfortunately the
 133    Debian maintainer hasn't provided a clean fix for Emacs.
 134    movemail.c will use `maillock' when MAILDIR, HAVE_LIBMAIL and
 135    HAVE_MAILLOCK_H are defined, so the following appears to be the
 136    correct logic.  -- fx */
 137 /* We must check for HAVE_LIBLOCKFILE too, as movemail does.
 138    liblockfile is a Free Software replacement for libmail, used on
 139    Debian systems and elsewhere. -rfr */
 140
 141 #if !((defined (HAVE_LIBMAIL) || defined (HAVE_LIBLOCKFILE)) && \
 142       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 #define START_FILES pre-crt0.o /usr/lib/crt1.o /usr/lib/crti.o
 184
 185 /* Here is how to find X Windows.  LD_SWITCH_X_SITE_AUX gives an -R option
 186    says where to find X windows at run time.  */
 187
 188 #ifdef __mips__
 189 #define LD_SWITCH_SYSTEM -G 0 LD_SWITCH_X_SITE_AUX
 190 #else
 191 #define LD_SWITCH_SYSTEM LD_SWITCH_X_SITE_AUX
 192 #endif /* __mips__ */
 193
 194 /* Link temacs with -z nocombreloc so that unexec works right, whether or
 195    not -z combreloc is the default.  GNU ld ignores unknown -z KEYWORD
 196    switches, so this also works with older versions that don't implement
 197    -z combreloc.  */
 198 #define LD_SWITCH_SYSTEM_TEMACS -z nocombreloc
 199
 200 #ifdef emacs
 201 #define INTERRUPT_INPUT
 202 #endif
 203
 204 /* This is needed for sysdep.c */
 205
 206 #define NO_SIOCTL_H           /* don't have sioctl.h */
 207
 208 #define HAVE_WAIT_HEADER
 209
 210 #define SYSV_SYSTEM_DIR       /* use dirent.h */
 211
 212 #define POSIX                 /* affects getpagesize.h and systty.h */
 213 #define POSIX_SIGNALS
 214
 215 /* Best not to include -lg, unless it is last on the command line */
 216 #define LIBS_DEBUG
 217 #undef LIB_GCC
 218 #define LIB_GCC
 219 #define LIB_STANDARD -lgcc -lc -lgcc /usr/lib/crtn.o
 220
 221 /* Don't use -g in test compiles in configure.
 222    This is so we will use the same shared libs for that linking
 223    that are used when linking temacs.  */
 224 #ifdef THIS_IS_CONFIGURE
 225 #define C_DEBUG_SWITCH
 226 #endif
 227
 228 /* 21 Jun 06: Eric Hanchrow <offby1@blarg.net> says this works.  */
 229 #ifdef LINUX_SIGNALS_VIA_CHARACTERS_DOES_WORK
 230 #define SIGNALS_VIA_CHARACTERS
 231 #endif
 232
 233 /* Rob Malouf <malouf@csli.stanford.edu> says:
 234    SYSV IPC is standard a standard part of Linux since version 0.99pl10,
 235    and is a very common addition to previous versions.  */
 236
 237 #ifdef TERM
 238 #define LIBS_SYSTEM -lclient
 239 #define C_SWITCH_SYSTEM -D_BSD_SOURCE -I/usr/src/term
 240 #else
 241 /* alane@wozzle.linet.org says that -lipc is not a separate library,
 242    since libc-4.4.1.  So -lipc was deleted.  */
 243 #define LIBS_SYSTEM
 244 /* _BSD_SOURCE is redundant, at least in glibc2, since we define
 245    _GNU_SOURCE.  Left in in case it's relevant to libc5 systems and
 246    anyone's still using Emacs on those.  --fx 2002-12-14  */
 247 #define C_SWITCH_SYSTEM -D_BSD_SOURCE
 248 #endif
 249
 250 /* Paul Abrahams <abrahams@equinox.shaysnet.com> says this is needed.  */
 251 #define LIB_MOTIF -lXm -lXpm
 252
 253 #ifdef HAVE_LIBNCURSES
 254 #define TERMINFO
 255 #define LIBS_TERMCAP -lncurses
 256 #endif
 257
 258 #define HAVE_SYSVIPC
 259
 260 #define UNEXEC unexelf.o
 261
 262 #define A_TEXT_OFFSET(hdr) (N_MAGIC(hdr) == QMAGIC ? sizeof (struct exec) : 0)
 263 #define A_TEXT_SEEK(hdr) (N_TXTOFF(hdr) + A_TEXT_OFFSET(hdr))
 264 #define ADJUST_EXEC_HEADER \
 265   unexec_text_start = N_TXTADDR(ohdr) + A_TEXT_OFFSET(ohdr)
 266
 267 /* This is to work around mysterious gcc failures in some system versions.
 268    It is unlikely that Emacs changes will work around this problem;
 269    therefore, this should remain permanently.  */
 270 #ifndef HAVE_XRMSETDATABASE
 271 #define HAVE_XRMSETDATABASE
 272 #endif
 273
 274 /* Use BSD process groups, but use setpgid() instead of setpgrp() to
 275    actually set a process group. */
 276
 277 #define BSD_PGRPS
 278
 279 #define NARROWPROTO 1
 280
 281 /* Use mmap directly for allocating larger buffers.  */
 282 #ifdef DOUG_LEA_MALLOC
 283 #undef REL_ALLOC
 284 #endif
 285
 286 /* Tell that garbage collector that setjmp is known to save all
 287    registers relevant for conservative garbage collection in the
 288    jmp_buf.  */
 289 /* Not all the architectures are tested, but there are Debian packages
 290    for SCM and/or Guile on them, so the technique must work.  See also
 291    comments in alloc.c concerning setjmp and gcc.  Fixme:  it's
 292    probably safe to make this conditional just on GCC, except for ia64
 293    register window-flushing.  */
 294 /* Don't use #cpu here since in newest development versions of GCC,
 295    we must call cpp with -traditional, and that disables #cpu.  */
 296
 297 #if defined __i386__ || defined __sparc__ || defined __mc68000__ \
 298     || defined __alpha__ || defined __mips__ || defined __s390__ \
 299     || defined __arm__ || defined __powerpc__ || defined __amd64__ \
 300     || defined __ia64__
 301 #define GC_SETJMP_WORKS 1
 302 #define GC_MARK_STACK GC_MAKE_GCPROS_NOOPS
 303 #ifdef __mc68000__
 304 #define GC_LISP_OBJECT_ALIGNMENT 2
 305 #endif
 306 #ifdef __ia64__
 307 #define GC_MARK_SECONDARY_STACK()                               \
 308   do {                                                          \
 309     extern void *__libc_ia64_register_backing_store_base;       \
 310     __builtin_ia64_flushrs ();                                  \
 311     mark_memory (__libc_ia64_register_backing_store_base,       \
 312                  __builtin_ia64_bsp (), 0);                     \
 313   } while (0)
 314 #endif
 315 #endif
 316
 317 /* arch-tag: 6244ea2a-abd0-44ec-abec-ff3dcc9afea9
 318    (do not change this comment) */