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, 2009  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 of the License, or
  10 (at your option) 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.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 /* This file was put together by Michael K. Johnson and Rik Faith.  */
  21
  22
  23 /*
  24  *      Define symbols to identify the version of Unix this is.
  25  *      Define all the symbols that apply correctly.
  26  */
  27
  28 #define USG
  29 #define GNU_LINUX
  30
  31 /* SYSTEM_TYPE should indicate the kind of system you are using.
  32  It sets the Lisp variable system-type.  */
  33
  34 #define SYSTEM_TYPE "gnu/linux"         /* All the best software is free. */
  35
  36 #ifndef NOT_C_CODE
  37 #ifdef emacs
  38 #ifdef HAVE_LINUX_VERSION_H
  39 #include <linux/version.h>
  40
  41 #if LINUX_VERSION_CODE >= 0x20400
  42 /* 21 Jun 06: Eric Hanchrow <offby1@blarg.net> says this works.  */
  43 #define SIGNALS_VIA_CHARACTERS
  44 #endif /* LINUX_VERSION_CODE >= 0x20400 */
  45 #endif /* HAVE_LINUX_VERSION_H */
  46 #endif /* emacs */
  47 #endif /* NOT_C_CODE */
  48
  49 #if defined HAVE_GRANTPT
  50 #define UNIX98_PTYS
  51
  52 /* Run only once.  We need a `for'-loop because the code uses
  53    `continue'.  */
  54
  55 #define PTY_ITERATION   for (i = 0; i < 1; i++)
  56
  57 #ifdef HAVE_GETPT
  58 #define PTY_NAME_SPRINTF
  59 #define PTY_OPEN fd = getpt ()
  60 #else /* not HAVE_GETPT */
  61 #define PTY_NAME_SPRINTF strcpy (pty_name, "/dev/ptmx");
  62 #endif /* not HAVE_GETPT */
  63
  64 /* Note that grantpt and unlockpt may fork.  We must block SIGCHLD to
  65    prevent sigchld_handler from intercepting the child's death.  */
  66
  67 #define PTY_TTY_NAME_SPRINTF                            \
  68   {                                                     \
  69     char *ptyname;                                      \
  70                                                         \
  71     sigblock (sigmask (SIGCHLD));                       \
  72     if (grantpt (fd) == -1 || unlockpt (fd) == -1       \
  73         || !(ptyname = ptsname(fd)))                    \
  74       {                                                 \
  75         sigunblock (sigmask (SIGCHLD));                 \
  76         close (fd);                                     \
  77         return -1;                                      \
  78       }                                                 \
  79     strncpy (pty_name, ptyname, sizeof (pty_name));     \
  80     pty_name[sizeof (pty_name) - 1] = 0;                \
  81     sigunblock (sigmask (SIGCHLD));                     \
  82   }
  83
  84 #else /* not HAVE_GRANTPT */
  85
  86 /* Letter to use in finding device name of first pty,
  87    if system supports pty's.  'p' means it is /dev/ptyp0  */
  88
  89 #define FIRST_PTY_LETTER 'p'
  90
  91 #endif  /* not HAVE_GRANTPT */
  92
  93 /*  Define HAVE_TERMIOS if the system provides POSIX-style
  94     functions and macros for terminal control.  */
  95
  96 #define HAVE_TERMIOS
  97
  98 /* Define HAVE_PTYS if the system supports pty devices. */
  99
 100 #define HAVE_PTYS
 101
 102 #define HAVE_SOCKETS
 103
 104 /* Define this symbol if your system has the functions bcopy, etc. */
 105
 106 #define BSTRING
 107
 108 /* This is used in list_system_processes.  */
 109 #define HAVE_PROCFS 1
 110
 111 /* define MAIL_USE_FLOCK if the mailer uses flock
 112    to interlock access to /usr/spool/mail/$USER.
 113    The alternative is that a lock file named
 114    /usr/spool/mail/$USER.lock.  */
 115
 116 /* On GNU/Linux systems, both methods are used by various mail
 117    programs.  I assume that most people are using newer mailers that
 118    have heard of flock.  Change this if you need to. */
 119 /* Debian contains a patch which says: ``On Debian/GNU/Linux systems,
 120    configure gets the right answers, and that means *NOT* using flock.
 121    Using flock is guaranteed to be the wrong thing. See Debian Policy
 122    for details.'' and then uses `#ifdef DEBIAN'.  Unfortunately the
 123    Debian maintainer hasn't provided a clean fix for Emacs.
 124    movemail.c will use `maillock' when MAILDIR, HAVE_LIBMAIL and
 125    HAVE_MAILLOCK_H are defined, so the following appears to be the
 126    correct logic.  -- fx */
 127 /* We must check for HAVE_LIBLOCKFILE too, as movemail does.
 128    liblockfile is a Free Software replacement for libmail, used on
 129    Debian systems and elsewhere. -rfr */
 130
 131 #if !((defined (HAVE_LIBMAIL) || defined (HAVE_LIBLOCKFILE)) && \
 132       defined (HAVE_MAILLOCK_H))
 133 #define MAIL_USE_FLOCK
 134 #endif
 135
 136 /* Define CLASH_DETECTION if you want lock files to be written
 137    so that Emacs can tell instantly when you try to modify
 138    a file that someone else has modified in his Emacs.  */
 139
 140 #define CLASH_DETECTION
 141
 142 /* Here, on a separate page, add any special hacks needed
 143    to make Emacs work on this system.  For example,
 144    you might define certain system call names that don't
 145    exist on your system, or that do different things on
 146    your system and must be used only through an encapsulation
 147    (Which you should place, by convention, in sysdep.c).  */
 148 \f
 149 /* This is needed for dispnew.c:update_frame */
 150
 151 #ifdef emacs
 152 #include <stdio.h>  /* Get the definition of _IO_STDIO_H.  */
 153 #if defined(_IO_STDIO_H) || defined(_STDIO_USES_IOSTREAM)
 154 /* new C libio names */
 155 #define GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE) \
 156   ((FILE)->_IO_write_ptr - (FILE)->_IO_write_base)
 157 #elif defined (__UCLIBC__)
 158 /* using the uClibc library */
 159 #define GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE) \
 160   ((FILE)->__bufpos - (FILE)->__bufstart)
 161 #else /* !_IO_STDIO_H && ! __UCLIBC__ */
 162 /* old C++ iostream names */
 163 #define GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE) \
 164   ((FILE)->_pptr - (FILE)->_pbase)
 165 #endif /* !_IO_STDIO_H && ! __UCLIBC__ */
 166 #endif /* emacs */
 167
 168 /* Ask GCC where to find libgcc.a.  */
 169 #define LIB_GCC `$(CC) $(C_SWITCH_X_SITE) -print-libgcc-file-name`
 170
 171 #define START_FILES pre-crt0.o /usr/lib/crt1.o /usr/lib/crti.o
 172
 173 /* Here is how to find X Windows.  LD_SWITCH_X_SITE_AUX gives an -R option
 174    says where to find X windows at run time.  */
 175
 176 #ifdef __mips__
 177 #define LD_SWITCH_SYSTEM -G 0 LD_SWITCH_X_SITE_AUX
 178 #else
 179 #define LD_SWITCH_SYSTEM LD_SWITCH_X_SITE_AUX
 180 #endif /* __mips__ */
 181
 182 /* Link temacs with -z nocombreloc so that unexec works right, whether or
 183    not -z combreloc is the default.  GNU ld ignores unknown -z KEYWORD
 184    switches, so this also works with older versions that don't implement
 185    -z combreloc.  */
 186 #define LD_SWITCH_SYSTEM_TEMACS -z nocombreloc
 187
 188 #ifdef emacs
 189 #define INTERRUPT_INPUT
 190 #endif
 191
 192 #define SYSV_SYSTEM_DIR       /* use dirent.h */
 193
 194 #define POSIX                 /* affects getpagesize.h and systty.h */
 195 #define POSIX_SIGNALS
 196
 197 /* Best not to include -lg, unless it is last on the command line */
 198 #define LIBS_DEBUG
 199 #undef LIB_GCC
 200 #define LIB_GCC
 201 #define LIB_STANDARD -lgcc -lc -lgcc /usr/lib/crtn.o
 202
 203 /* Don't use -g in test compiles in configure.
 204    This is so we will use the same shared libs for that linking
 205    that are used when linking temacs.  */
 206 #ifdef THIS_IS_CONFIGURE
 207 #define C_DEBUG_SWITCH
 208 #endif
 209
 210 /* alane@wozzle.linet.org says that -lipc is not a separate library,
 211    since libc-4.4.1.  So -lipc was deleted.  */
 212 #define LIBS_SYSTEM
 213 /* _BSD_SOURCE is redundant, at least in glibc2, since we define
 214    _GNU_SOURCE.  Left in in case it's relevant to libc5 systems and
 215    anyone's still using Emacs on those.  --fx 2002-12-14  */
 216 #define C_SWITCH_SYSTEM -D_BSD_SOURCE
 217
 218 /* Paul Abrahams <abrahams@equinox.shaysnet.com> says this is needed.  */
 219 #define LIB_MOTIF -lXm -lXpm
 220
 221 #ifdef HAVE_LIBNCURSES
 222 #define TERMINFO
 223 #define LIBS_TERMCAP -lncurses
 224 #endif
 225
 226 #define UNEXEC unexelf.o
 227
 228 /* This is to work around mysterious gcc failures in some system versions.
 229    It is unlikely that Emacs changes will work around this problem;
 230    therefore, this should remain permanently.  */
 231 #ifndef HAVE_XRMSETDATABASE
 232 #define HAVE_XRMSETDATABASE
 233 #endif
 234
 235 /* Use BSD process groups, but use setpgid() instead of setpgrp() to
 236    actually set a process group. */
 237 /* Interesting: only GNU/Linux defines this,  but the BSDs do not... */
 238 #define BSD_PGRPS
 239
 240 #define NARROWPROTO 1
 241
 242 /* Use mmap directly for allocating larger buffers.  */
 243 #ifdef DOUG_LEA_MALLOC
 244 #undef REL_ALLOC
 245 #endif
 246
 247 /* Tell that garbage collector that setjmp is known to save all
 248    registers relevant for conservative garbage collection in the
 249    jmp_buf.  */
 250 /* Not all the architectures are tested, but there are Debian packages
 251    for SCM and/or Guile on them, so the technique must work.  See also
 252    comments in alloc.c concerning setjmp and gcc.  Fixme:  it's
 253    probably safe to make this conditional just on GCC, except for ia64
 254    register window-flushing.  */
 255 /* Don't use #cpu here since in newest development versions of GCC,
 256    we must call cpp with -traditional, and that disables #cpu.  */
 257
 258 #if defined __i386__ || defined __sparc__ || defined __mc68000__ \
 259     || defined __alpha__ || defined __mips__ || defined __s390__ \
 260     || defined __arm__ || defined __powerpc__ || defined __amd64__ \
 261     || defined __ia64__ || defined __sh__
 262 #define GC_SETJMP_WORKS 1
 263 #define GC_MARK_STACK GC_MAKE_GCPROS_NOOPS
 264 #ifdef __mc68000__
 265 #define GC_LISP_OBJECT_ALIGNMENT 2
 266 #endif
 267 #ifdef __ia64__
 268 #define GC_MARK_SECONDARY_STACK()                               \
 269   do {                                                          \
 270     extern void *__libc_ia64_register_backing_store_base;       \
 271     __builtin_ia64_flushrs ();                                  \
 272     mark_memory (__libc_ia64_register_backing_store_base,       \
 273                  __builtin_ia64_bsp (), 0);                     \
 274   } while (0)
 275 #endif
 276 #endif
 277
 278 /* arch-tag: 6244ea2a-abd0-44ec-abec-ff3dcc9afea9
 279    (do not change this comment) */