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, 2010
   4                  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
 107 #define BSTRING
 108
 109 /* This is used in list_system_processes.  */
 110 #define HAVE_PROCFS 1
 111
 112 /* define MAIL_USE_FLOCK if the mailer uses flock
 113    to interlock access to /usr/spool/mail/$USER.
 114    The alternative is that a lock file named
 115    /usr/spool/mail/$USER.lock.  */
 116
 117 /* On GNU/Linux systems, both methods are used by various mail
 118    programs.  I assume that most people are using newer mailers that
 119    have heard of flock.  Change this if you need to. */
 120 /* Debian contains a patch which says: ``On Debian/GNU/Linux systems,
 121    configure gets the right answers, and that means *NOT* using flock.
 122    Using flock is guaranteed to be the wrong thing. See Debian Policy
 123    for details.'' and then uses `#ifdef DEBIAN'.  Unfortunately the
 124    Debian maintainer hasn't provided a clean fix for Emacs.
 125    movemail.c will use `maillock' when MAILDIR, HAVE_LIBMAIL and
 126    HAVE_MAILLOCK_H are defined, so the following appears to be the
 127    correct logic.  -- fx */
 128 /* We must check for HAVE_LIBLOCKFILE too, as movemail does.
 129    liblockfile is a Free Software replacement for libmail, used on
 130    Debian systems and elsewhere. -rfr */
 131
 132 #if !((defined (HAVE_LIBMAIL) || defined (HAVE_LIBLOCKFILE)) && \
 133       defined (HAVE_MAILLOCK_H))
 134 #define MAIL_USE_FLOCK
 135 #endif
 136
 137 /* Define CLASH_DETECTION if you want lock files to be written
 138    so that Emacs can tell instantly when you try to modify
 139    a file that someone else has modified in his Emacs.  */
 140
 141 #define CLASH_DETECTION
 142
 143 /* Here, on a separate page, add any special hacks needed
 144    to make Emacs work on this system.  For example,
 145    you might define certain system call names that don't
 146    exist on your system, or that do different things on
 147    your system and must be used only through an encapsulation
 148    (Which you should place, by convention, in sysdep.c).  */
 149 \f
 150 /* This is needed for dispnew.c:update_frame */
 151
 152 #ifdef emacs
 153 #include <stdio.h>  /* Get the definition of _IO_STDIO_H.  */
 154 #if defined(_IO_STDIO_H) || defined(_STDIO_USES_IOSTREAM)
 155 /* new C libio names */
 156 #define GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE) \
 157   ((FILE)->_IO_write_ptr - (FILE)->_IO_write_base)
 158 #elif defined (__UCLIBC__)
 159 /* using the uClibc library */
 160 #define GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE) \
 161   ((FILE)->__bufpos - (FILE)->__bufstart)
 162 #else /* !_IO_STDIO_H && ! __UCLIBC__ */
 163 /* old C++ iostream names */
 164 #define GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE) \
 165   ((FILE)->_pptr - (FILE)->_pbase)
 166 #endif /* !_IO_STDIO_H && ! __UCLIBC__ */
 167 #endif /* emacs */
 168
 169 /* Ask GCC where to find libgcc.a.  */
 170 #define LIB_GCC `$(CC) $(C_SWITCH_X_SITE) -print-libgcc-file-name`
 171
 172 #define START_FILES pre-crt0.o $(CRT_DIR)/crt1.o $(CRT_DIR)/crti.o
 173
 174 /* Here is how to find X Windows.  LD_SWITCH_X_SITE_AUX gives an -R option
 175    that says where to find X windows at run time.  */
 176
 177 #ifdef __mips__
 178 #define LD_SWITCH_SYSTEM -G 0 $(LD_SWITCH_X_SITE_AUX)
 179 #else
 180 #define LD_SWITCH_SYSTEM $(LD_SWITCH_X_SITE_AUX)
 181 #endif /* __mips__ */
 182
 183 #ifdef emacs
 184 #define INTERRUPT_INPUT
 185 #endif
 186
 187 #define SYSV_SYSTEM_DIR       /* use dirent.h */
 188
 189 #define POSIX                 /* affects getpagesize.h and systty.h */
 190 #define POSIX_SIGNALS
 191
 192 #undef LIB_GCC
 193 #define LIB_GCC
 194 #define LIB_STANDARD -lgcc -lc -lgcc $(CRT_DIR)/crtn.o
 195
 196 #ifdef HAVE_LIBNCURSES
 197 #define TERMINFO
 198 #define LIBS_TERMCAP -lncurses
 199 #endif
 200
 201 #define UNEXEC unexelf.o
 202
 203 /* This is to work around mysterious gcc failures in some system versions.
 204    It is unlikely that Emacs changes will work around this problem;
 205    therefore, this should remain permanently.  */
 206 #ifndef HAVE_XRMSETDATABASE
 207 #define HAVE_XRMSETDATABASE
 208 #endif
 209
 210 /* Use BSD process groups, but use setpgid() instead of setpgrp() to
 211    actually set a process group. */
 212 /* Interesting: only GNU/Linux defines this,  but the BSDs do not... */
 213 /* #define BSD_PGRPS */
 214
 215 #define NARROWPROTO 1
 216
 217 /* Use mmap directly for allocating larger buffers.  */
 218 #ifdef DOUG_LEA_MALLOC
 219 #undef REL_ALLOC
 220 #endif
 221
 222 /* Tell that garbage collector that setjmp is known to save all
 223    registers relevant for conservative garbage collection in the
 224    jmp_buf.  */
 225 /* Not all the architectures are tested, but there are Debian packages
 226    for SCM and/or Guile on them, so the technique must work.  See also
 227    comments in alloc.c concerning setjmp and gcc.  Fixme:  it's
 228    probably safe to make this conditional just on GCC, except for ia64
 229    register window-flushing.  */
 230 /* Don't use #cpu here since in newest development versions of GCC,
 231    we must call cpp with -traditional, and that disables #cpu.  */
 232
 233 #if defined __i386__ || defined __sparc__ || defined __mc68000__ \
 234     || defined __alpha__ || defined __mips__ || defined __s390__ \
 235     || defined __arm__ || defined __powerpc__ || defined __amd64__ \
 236     || defined __ia64__ || defined __sh__
 237 #define GC_SETJMP_WORKS 1
 238 #define GC_MARK_STACK GC_MAKE_GCPROS_NOOPS
 239 #ifdef __mc68000__
 240 #define GC_LISP_OBJECT_ALIGNMENT 2
 241 #endif
 242 #ifdef __ia64__
 243 #define GC_MARK_SECONDARY_STACK()                               \
 244   do {                                                          \
 245     extern void *__libc_ia64_register_backing_store_base;       \
 246     __builtin_ia64_flushrs ();                                  \
 247     mark_memory (__libc_ia64_register_backing_store_base,       \
 248                  __builtin_ia64_bsp (), 0);                     \
 249   } while (0)
 250 #endif
 251 #endif
 252
 253 /* arch-tag: 6244ea2a-abd0-44ec-abec-ff3dcc9afea9
 254    (do not change this comment) */