src/s/gnu-linux.h

   1 /* This file is the configuration file for Linux-based GNU systems
   2
   3 Copyright (C) 1985-1986, 1992, 1994, 1996, 1999, 2001-2012
   4   Free Software Foundation, Inc.
   5
   6 This file was put together by Michael K. Johnson and Rik Faith.
   7
   8 This file is part of GNU Emacs.
   9
  10 GNU Emacs is free software: you can redistribute it and/or modify
  11 it under the terms of the GNU General Public License as published by
  12 the Free Software Foundation, either version 3 of the License, or
  13 (at your option) any later version.
  14
  15 GNU Emacs is distributed in the hope that it will be useful,
  16 but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 GNU General Public License for more details.
  19
  20 You should have received a copy of the GNU General Public License
  21 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
  22
  23 /* Define symbols to identify the version of Unix this is.
  24    Define all the symbols that apply correctly.  */
  25 #define USG
  26 #define GNU_LINUX
  27
  28 #ifdef emacs
  29 #ifdef HAVE_LINUX_VERSION_H
  30 #include <linux/version.h>
  31
  32 #if LINUX_VERSION_CODE >= 0x20400
  33 /* 21 Jun 06: Eric Hanchrow <offby1@blarg.net> says this works.  */
  34 #define SIGNALS_VIA_CHARACTERS
  35 #endif /* LINUX_VERSION_CODE >= 0x20400 */
  36 #endif /* HAVE_LINUX_VERSION_H */
  37 #endif /* emacs */
  38
  39 #if defined HAVE_GRANTPT
  40 #define UNIX98_PTYS
  41
  42 /* Run only once.  We need a `for'-loop because the code uses `continue'.  */
  43 #define PTY_ITERATION   int i; for (i = 0; i < 1; i++)
  44
  45 #ifdef HAVE_GETPT
  46 #define PTY_NAME_SPRINTF
  47 #define PTY_OPEN fd = getpt ()
  48 #else /* not HAVE_GETPT */
  49 #define PTY_NAME_SPRINTF strcpy (pty_name, "/dev/ptmx");
  50 #endif /* not HAVE_GETPT */
  51
  52 /* Note that grantpt and unlockpt may fork.  We must block SIGCHLD to
  53    prevent sigchld_handler from intercepting the child's death.  */
  54 #define PTY_TTY_NAME_SPRINTF                            \
  55   {                                                     \
  56     char *ptyname;                                      \
  57                                                         \
  58     sigblock (sigmask (SIGCHLD));                       \
  59     if (grantpt (fd) == -1 || unlockpt (fd) == -1       \
  60         || !(ptyname = ptsname(fd)))                    \
  61       {                                                 \
  62         sigunblock (sigmask (SIGCHLD));                 \
  63         close (fd);                                     \
  64         return -1;                                      \
  65       }                                                 \
  66     strncpy (pty_name, ptyname, sizeof (pty_name));     \
  67     pty_name[sizeof (pty_name) - 1] = 0;                \
  68     sigunblock (sigmask (SIGCHLD));                     \
  69   }
  70
  71 #else /* not HAVE_GRANTPT */
  72
  73 /* Letter to use in finding device name of first pty,
  74    if system supports pty's.  'p' means it is /dev/ptyp0  */
  75 #define FIRST_PTY_LETTER 'p'
  76
  77 #endif  /* not HAVE_GRANTPT */
  78
  79 /* Define HAVE_PTYS if the system supports pty devices.  */
  80 #define HAVE_PTYS
  81
  82 #define HAVE_SOCKETS
  83
  84 /* Define CLASH_DETECTION if you want lock files to be written
  85    so that Emacs can tell instantly when you try to modify
  86    a file that someone else has modified in his Emacs.  */
  87 #define CLASH_DETECTION
  88
  89 /* Here, on a separate page, add any special hacks needed
  90    to make Emacs work on this system.  For example,
  91    you might define certain system call names that don't
  92    exist on your system, or that do different things on
  93    your system and must be used only through an encapsulation
  94    (Which you should place, by convention, in sysdep.c).  */
  95 \f
  96 /* This is needed for dispnew.c:update_frame.  */
  97 #ifdef emacs
  98 #include <stdio.h>  /* Get the definition of _IO_STDIO_H.  */
  99 #if defined (_IO_STDIO_H) || defined (_STDIO_USES_IOSTREAM)
 100 /* New C libio names.  */
 101 #define GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE) \
 102   ((FILE)->_IO_write_ptr - (FILE)->_IO_write_base)
 103 #elif defined (__UCLIBC__)
 104 /* Using the uClibc library.  */
 105 #define GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE) \
 106   ((FILE)->__bufpos - (FILE)->__bufstart)
 107 #else /* !_IO_STDIO_H && ! __UCLIBC__ */
 108 /* Old C++ iostream names.  */
 109 #define GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE) \
 110   ((FILE)->_pptr - (FILE)->_pbase)
 111 #endif /* !_IO_STDIO_H && ! __UCLIBC__ */
 112
 113 #define INTERRUPT_INPUT
 114 #endif /* emacs */
 115
 116 #define POSIX                 /* affects getpagesize.h and systty.h */
 117
 118 /* This is to work around mysterious gcc failures in some system versions.
 119    It is unlikely that Emacs changes will work around this problem;
 120    therefore, this should remain permanently.  */
 121 #ifndef HAVE_XRMSETDATABASE
 122 #define HAVE_XRMSETDATABASE
 123 #endif
 124
 125 #define NARROWPROTO 1
 126
 127 /* Tell that garbage collector that setjmp is known to save all
 128    registers relevant for conservative garbage collection in the jmp_buf.  */
 129 /* Not all the architectures are tested, but there are Debian packages
 130    for SCM and/or Guile on them, so the technique must work.  See also
 131    comments in alloc.c concerning setjmp and gcc.  Fixme:  it's
 132    probably safe to make this conditional just on GCC, except for ia64
 133    register window-flushing.  */
 134 /* Don't use #cpu here since in newest development versions of GCC,
 135    we must call cpp with -traditional, and that disables #cpu.  */
 136 #if defined __i386__ || defined __sparc__ || defined __mc68000__ \
 137     || defined __alpha__ || defined __mips__ || defined __s390__ \
 138     || defined __arm__ || defined __powerpc__ || defined __amd64__ \
 139     || defined __ia64__ || defined __sh__
 140 #define GC_SETJMP_WORKS 1
 141 #ifdef __ia64__
 142 #define GC_MARK_SECONDARY_STACK()                               \
 143   do {                                                          \
 144     extern void *__libc_ia64_register_backing_store_base;       \
 145     __builtin_ia64_flushrs ();                                  \
 146     mark_memory (__libc_ia64_register_backing_store_base,       \
 147                  __builtin_ia64_bsp ());                        \
 148   } while (0)
 149 #endif
 150 #else
 151 #define GC_MARK_STACK GC_USE_GCPROS_AS_BEFORE
 152 #endif
 153
 154 #ifdef __i386__
 155 /* libc-linux/sysdeps/linux/i386/ulimit.c says that due to shared library, */
 156 /* we cannot get the maximum address for brk */
 157 # define ULIMIT_BREAK_VALUE (32*1024*1024)
 158 #endif