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, 2002, 2003, 2004,
   4   2005, 2006, 2007, 2008, 2009, 2010  Free Software Foundation, Inc.
   5
   6 This file is part of GNU Emacs.
   7
   8 GNU Emacs is free software: you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation, either version 3 of the License, or
  11 (at your option) any later version.
  12
  13 GNU Emacs is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 /* This file was put together by Michael K. Johnson and Rik Faith.  */
  22
  23
  24 /*
  25  *      Define symbols to identify the version of Unix this is.
  26  *      Define all the symbols that apply correctly.
  27  */
  28
  29 #define USG
  30 #define GNU_LINUX
  31
  32 /* SYSTEM_TYPE should indicate the kind of system you are using.
  33  It sets the Lisp variable system-type.  */
  34
  35 #define SYSTEM_TYPE "gnu/linux"         /* All the best software is free. */
  36
  37 #ifndef NOT_C_CODE
  38 #ifdef emacs
  39 #ifdef HAVE_LINUX_VERSION_H
  40 #include <linux/version.h>
  41
  42 #if LINUX_VERSION_CODE >= 0x20400
  43 /* 21 Jun 06: Eric Hanchrow <offby1@blarg.net> says this works.  */
  44 #define SIGNALS_VIA_CHARACTERS
  45 #endif /* LINUX_VERSION_CODE >= 0x20400 */
  46 #endif /* HAVE_LINUX_VERSION_H */
  47 #endif /* emacs */
  48 #endif /* NOT_C_CODE */
  49
  50 #if defined HAVE_GRANTPT
  51 #define UNIX98_PTYS
  52
  53 /* Run only once.  We need a `for'-loop because the code uses
  54    `continue'.  */
  55
  56 #define PTY_ITERATION   for (i = 0; i < 1; i++)
  57
  58 #ifdef HAVE_GETPT
  59 #define PTY_NAME_SPRINTF
  60 #define PTY_OPEN fd = getpt ()
  61 #else /* not HAVE_GETPT */
  62 #define PTY_NAME_SPRINTF strcpy (pty_name, "/dev/ptmx");
  63 #endif /* not HAVE_GETPT */
  64
  65 /* Note that grantpt and unlockpt may fork.  We must block SIGCHLD to
  66    prevent sigchld_handler from intercepting the child's death.  */
  67
  68 #define PTY_TTY_NAME_SPRINTF                            \
  69   {                                                     \
  70     char *ptyname;                                      \
  71                                                         \
  72     sigblock (sigmask (SIGCHLD));                       \
  73     if (grantpt (fd) == -1 || unlockpt (fd) == -1       \
  74         || !(ptyname = ptsname(fd)))                    \
  75       {                                                 \
  76         sigunblock (sigmask (SIGCHLD));                 \
  77         close (fd);                                     \
  78         return -1;                                      \
  79       }                                                 \
  80     strncpy (pty_name, ptyname, sizeof (pty_name));     \
  81     pty_name[sizeof (pty_name) - 1] = 0;                \
  82     sigunblock (sigmask (SIGCHLD));                     \
  83   }
  84
  85 #else /* not HAVE_GRANTPT */
  86
  87 /* Letter to use in finding device name of first pty,
  88    if system supports pty's.  'p' means it is /dev/ptyp0  */
  89
  90 #define FIRST_PTY_LETTER 'p'
  91
  92 #endif  /* not HAVE_GRANTPT */
  93
  94 /*  Define HAVE_TERMIOS if the system provides POSIX-style
  95     functions and macros for terminal control.  */
  96
  97 #define HAVE_TERMIOS
  98
  99 /* Define HAVE_PTYS if the system supports pty devices. */
 100
 101 #define HAVE_PTYS
 102
 103 #define HAVE_SOCKETS
 104
 105 /* Define this symbol if your system has the functions bcopy, etc. */
 106 #define BSTRING
 107
 108 /* This is used in list_system_processes.  */
 109 #define HAVE_PROCFS 1
 110
 111
 112 /* Define CLASH_DETECTION if you want lock files to be written
 113    so that Emacs can tell instantly when you try to modify
 114    a file that someone else has modified in his Emacs.  */
 115 #define CLASH_DETECTION
 116
 117 /* Here, on a separate page, add any special hacks needed
 118    to make Emacs work on this system.  For example,
 119    you might define certain system call names that don't
 120    exist on your system, or that do different things on
 121    your system and must be used only through an encapsulation
 122    (Which you should place, by convention, in sysdep.c).  */
 123 \f
 124 /* This is needed for dispnew.c:update_frame */
 125
 126 #ifdef emacs
 127 #include <stdio.h>  /* Get the definition of _IO_STDIO_H.  */
 128 #if defined(_IO_STDIO_H) || defined(_STDIO_USES_IOSTREAM)
 129 /* new C libio names */
 130 #define GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE) \
 131   ((FILE)->_IO_write_ptr - (FILE)->_IO_write_base)
 132 #elif defined (__UCLIBC__)
 133 /* using the uClibc library */
 134 #define GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE) \
 135   ((FILE)->__bufpos - (FILE)->__bufstart)
 136 #else /* !_IO_STDIO_H && ! __UCLIBC__ */
 137 /* old C++ iostream names */
 138 #define GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE) \
 139   ((FILE)->_pptr - (FILE)->_pbase)
 140 #endif /* !_IO_STDIO_H && ! __UCLIBC__ */
 141 #endif /* emacs */
 142
 143 /* Ask GCC where to find libgcc.a.  */
 144 #define LIB_GCC `$(CC) $(C_SWITCH_X_SITE) -print-libgcc-file-name`
 145
 146 #ifdef emacs
 147 #define INTERRUPT_INPUT
 148 #endif
 149
 150 #define SYSV_SYSTEM_DIR       /* use dirent.h */
 151
 152 #define POSIX                 /* affects getpagesize.h and systty.h */
 153
 154 #undef LIB_GCC
 155 #define LIB_GCC
 156
 157 #define UNEXEC unexelf.o
 158
 159 /* This is to work around mysterious gcc failures in some system versions.
 160    It is unlikely that Emacs changes will work around this problem;
 161    therefore, this should remain permanently.  */
 162 #ifndef HAVE_XRMSETDATABASE
 163 #define HAVE_XRMSETDATABASE
 164 #endif
 165
 166 #define NARROWPROTO 1
 167
 168 /* Use mmap directly for allocating larger buffers.  */
 169 #ifdef DOUG_LEA_MALLOC
 170 #undef REL_ALLOC
 171 #endif
 172
 173 /* Tell that garbage collector that setjmp is known to save all
 174    registers relevant for conservative garbage collection in the
 175    jmp_buf.  */
 176 /* Not all the architectures are tested, but there are Debian packages
 177    for SCM and/or Guile on them, so the technique must work.  See also
 178    comments in alloc.c concerning setjmp and gcc.  Fixme:  it's
 179    probably safe to make this conditional just on GCC, except for ia64
 180    register window-flushing.  */
 181 /* Don't use #cpu here since in newest development versions of GCC,
 182    we must call cpp with -traditional, and that disables #cpu.  */
 183
 184 #if defined __i386__ || defined __sparc__ || defined __mc68000__ \
 185     || defined __alpha__ || defined __mips__ || defined __s390__ \
 186     || defined __arm__ || defined __powerpc__ || defined __amd64__ \
 187     || defined __ia64__ || defined __sh__
 188 #define GC_SETJMP_WORKS 1
 189 #define GC_MARK_STACK GC_MAKE_GCPROS_NOOPS
 190 #ifdef __mc68000__
 191 #define GC_LISP_OBJECT_ALIGNMENT 2
 192 #endif
 193 #ifdef __ia64__
 194 #define GC_MARK_SECONDARY_STACK()                               \
 195   do {                                                          \
 196     extern void *__libc_ia64_register_backing_store_base;       \
 197     __builtin_ia64_flushrs ();                                  \
 198     mark_memory (__libc_ia64_register_backing_store_base,       \
 199                  __builtin_ia64_bsp (), 0);                     \
 200   } while (0)
 201 #endif
 202 #endif
 203
 204 /* arch-tag: 6244ea2a-abd0-44ec-abec-ff3dcc9afea9
 205    (do not change this comment) */