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 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 /* These are used in Flist_system_processes and Fsystem_process_attributes.  */
 109 #define HAVE_PROCFS 1
 110 #define LISTPROC procfs_list_system_processes
 111 #define PROCATTR procfs_system_process_attributes
 112
 113 /* define MAIL_USE_FLOCK if the mailer uses flock
 114    to interlock access to /usr/spool/mail/$USER.
 115    The alternative is that a lock file named
 116    /usr/spool/mail/$USER.lock.  */
 117
 118 /* On GNU/Linux systems, both methods are used by various mail
 119    programs.  I assume that most people are using newer mailers that
 120    have heard of flock.  Change this if you need to. */
 121 /* Debian contains a patch which says: ``On Debian/GNU/Linux systems,
 122    configure gets the right answers, and that means *NOT* using flock.
 123    Using flock is guaranteed to be the wrong thing. See Debian Policy
 124    for details.'' and then uses `#ifdef DEBIAN'.  Unfortunately the
 125    Debian maintainer hasn't provided a clean fix for Emacs.
 126    movemail.c will use `maillock' when MAILDIR, HAVE_LIBMAIL and
 127    HAVE_MAILLOCK_H are defined, so the following appears to be the
 128    correct logic.  -- fx */
 129 /* We must check for HAVE_LIBLOCKFILE too, as movemail does.
 130    liblockfile is a Free Software replacement for libmail, used on
 131    Debian systems and elsewhere. -rfr */
 132
 133 #if !((defined (HAVE_LIBMAIL) || defined (HAVE_LIBLOCKFILE)) && \
 134       defined (HAVE_MAILLOCK_H))
 135 #define MAIL_USE_FLOCK
 136 #endif
 137
 138 /* Define CLASH_DETECTION if you want lock files to be written
 139    so that Emacs can tell instantly when you try to modify
 140    a file that someone else has modified in his Emacs.  */
 141
 142 #define CLASH_DETECTION
 143
 144 /* Here, on a separate page, add any special hacks needed
 145    to make Emacs work on this system.  For example,
 146    you might define certain system call names that don't
 147    exist on your system, or that do different things on
 148    your system and must be used only through an encapsulation
 149    (Which you should place, by convention, in sysdep.c).  */
 150 \f
 151 /* This is needed for dispnew.c:update_frame */
 152
 153 #ifdef emacs
 154 #include <stdio.h>  /* Get the definition of _IO_STDIO_H.  */
 155 #if defined(_IO_STDIO_H) || defined(_STDIO_USES_IOSTREAM)
 156 /* new C libio names */
 157 #define GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE) \
 158   ((FILE)->_IO_write_ptr - (FILE)->_IO_write_base)
 159 #elif defined (__UCLIBC__)
 160 /* using the uClibc library */
 161 #define GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE) \
 162   ((FILE)->__bufpos - (FILE)->__bufstart)
 163 #else /* !_IO_STDIO_H && ! __UCLIBC__ */
 164 /* old C++ iostream names */
 165 #define GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE) \
 166   ((FILE)->_pptr - (FILE)->_pbase)
 167 #endif /* !_IO_STDIO_H && ! __UCLIBC__ */
 168 #endif /* emacs */
 169
 170 /* Ask GCC where to find libgcc.a.  */
 171 #define LIB_GCC `$(CC) $(C_SWITCH_X_SITE) -print-libgcc-file-name`
 172
 173 #define START_FILES pre-crt0.o /usr/lib/crt1.o /usr/lib/crti.o
 174
 175 /* Here is how to find X Windows.  LD_SWITCH_X_SITE_AUX gives an -R option
 176    says where to find X windows at run time.  */
 177
 178 #ifdef __mips__
 179 #define LD_SWITCH_SYSTEM -G 0 LD_SWITCH_X_SITE_AUX
 180 #else
 181 #define LD_SWITCH_SYSTEM LD_SWITCH_X_SITE_AUX
 182 #endif /* __mips__ */
 183
 184 /* Link temacs with -z nocombreloc so that unexec works right, whether or
 185    not -z combreloc is the default.  GNU ld ignores unknown -z KEYWORD
 186    switches, so this also works with older versions that don't implement
 187    -z combreloc.  */
 188 #define LD_SWITCH_SYSTEM_TEMACS -z nocombreloc
 189
 190 #ifdef emacs
 191 #define INTERRUPT_INPUT
 192 #endif
 193
 194 #define SYSV_SYSTEM_DIR       /* use dirent.h */
 195
 196 #define POSIX                 /* affects getpagesize.h and systty.h */
 197 #define POSIX_SIGNALS
 198
 199 /* Best not to include -lg, unless it is last on the command line */
 200 #define LIBS_DEBUG
 201 #undef LIB_GCC
 202 #define LIB_GCC
 203 #define LIB_STANDARD -lgcc -lc -lgcc /usr/lib/crtn.o
 204
 205 /* Don't use -g in test compiles in configure.
 206    This is so we will use the same shared libs for that linking
 207    that are used when linking temacs.  */
 208 #ifdef THIS_IS_CONFIGURE
 209 #define C_DEBUG_SWITCH
 210 #endif
 211
 212 /* alane@wozzle.linet.org says that -lipc is not a separate library,
 213    since libc-4.4.1.  So -lipc was deleted.  */
 214 #define LIBS_SYSTEM
 215 /* _BSD_SOURCE is redundant, at least in glibc2, since we define
 216    _GNU_SOURCE.  Left in in case it's relevant to libc5 systems and
 217    anyone's still using Emacs on those.  --fx 2002-12-14  */
 218 #define C_SWITCH_SYSTEM -D_BSD_SOURCE
 219
 220 /* Paul Abrahams <abrahams@equinox.shaysnet.com> says this is needed.  */
 221 #define LIB_MOTIF -lXm -lXpm
 222
 223 #ifdef HAVE_LIBNCURSES
 224 #define TERMINFO
 225 #define LIBS_TERMCAP -lncurses
 226 #endif
 227
 228 #define UNEXEC unexelf.o
 229
 230 /* This is to work around mysterious gcc failures in some system versions.
 231    It is unlikely that Emacs changes will work around this problem;
 232    therefore, this should remain permanently.  */
 233 #ifndef HAVE_XRMSETDATABASE
 234 #define HAVE_XRMSETDATABASE
 235 #endif
 236
 237 /* Use BSD process groups, but use setpgid() instead of setpgrp() to
 238    actually set a process group. */
 239 /* Interesting: only GNU/Linux defines this,  but the BSDs do not... */
 240 #define BSD_PGRPS
 241
 242 #define NARROWPROTO 1
 243
 244 /* Use mmap directly for allocating larger buffers.  */
 245 #ifdef DOUG_LEA_MALLOC
 246 #undef REL_ALLOC
 247 #endif
 248
 249 /* Tell that garbage collector that setjmp is known to save all
 250    registers relevant for conservative garbage collection in the
 251    jmp_buf.  */
 252 /* Not all the architectures are tested, but there are Debian packages
 253    for SCM and/or Guile on them, so the technique must work.  See also
 254    comments in alloc.c concerning setjmp and gcc.  Fixme:  it's
 255    probably safe to make this conditional just on GCC, except for ia64
 256    register window-flushing.  */
 257 /* Don't use #cpu here since in newest development versions of GCC,
 258    we must call cpp with -traditional, and that disables #cpu.  */
 259
 260 #if defined __i386__ || defined __sparc__ || defined __mc68000__ \
 261     || defined __alpha__ || defined __mips__ || defined __s390__ \
 262     || defined __arm__ || defined __powerpc__ || defined __amd64__ \
 263     || defined __ia64__
 264 #define GC_SETJMP_WORKS 1
 265 #define GC_MARK_STACK GC_MAKE_GCPROS_NOOPS
 266 #ifdef __mc68000__
 267 #define GC_LISP_OBJECT_ALIGNMENT 2
 268 #endif
 269 #ifdef __ia64__
 270 #define GC_MARK_SECONDARY_STACK()                               \
 271   do {                                                          \
 272     extern void *__libc_ia64_register_backing_store_base;       \
 273     __builtin_ia64_flushrs ();                                  \
 274     mark_memory (__libc_ia64_register_backing_store_base,       \
 275                  __builtin_ia64_bsp (), 0);                     \
 276   } while (0)
 277 #endif
 278 #endif
 279
 280 /* arch-tag: 6244ea2a-abd0-44ec-abec-ff3dcc9afea9
 281    (do not change this comment) */