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 UNIPLUS */
  29 /* #define USG5 */
  30 #define USG
  31 /* #define BSD_SYSTEM */
  32 #define LINUX
  33 #define GNU_LINUX
  34
  35 /* SYSTEM_TYPE should indicate the kind of system you are using.
  36  It sets the Lisp variable system-type.  */
  37
  38 #define SYSTEM_TYPE "gnu/linux"         /* All the best software is free. */
  39
  40 #ifndef NOT_C_CODE
  41 #ifdef emacs
  42 #ifdef HAVE_LINUX_VERSION_H
  43 #include <linux/version.h>
  44
  45 #if LINUX_VERSION_CODE >= 0x20400
  46 #define LINUX_SIGNALS_VIA_CHARACTERS_DOES_WORK
  47 #endif /* LINUX_VERSION_CODE >= 0x20400 */
  48 #endif /* HAVE_LINUX_VERSION_H */
  49 #endif /* emacs */
  50 #endif /* NOT_C_CODE */
  51
  52 #if defined HAVE_GRANTPT
  53 #define UNIX98_PTYS
  54
  55 /* Run only once.  We need a `for'-loop because the code uses
  56    `continue'.  */
  57
  58 #define PTY_ITERATION   for (i = 0; i < 1; i++)
  59
  60 #ifdef HAVE_GETPT
  61 #define PTY_NAME_SPRINTF
  62 #define PTY_OPEN fd = getpt ()
  63 #else /* not HAVE_GETPT */
  64 #define PTY_NAME_SPRINTF strcpy (pty_name, "/dev/ptmx");
  65 #endif /* not HAVE_GETPT */
  66
  67 /* Note that grantpt and unlockpt may fork.  We must block SIGCHLD to
  68    prevent sigchld_handler from intercepting the child's death.  */
  69
  70 #define PTY_TTY_NAME_SPRINTF                            \
  71   {                                                     \
  72     char *ptyname;                                      \
  73                                                         \
  74     sigblock (sigmask (SIGCHLD));                       \
  75     if (grantpt (fd) == -1 || unlockpt (fd) == -1       \
  76         || !(ptyname = ptsname(fd)))                    \
  77       {                                                 \
  78         sigunblock (sigmask (SIGCHLD));                 \
  79         close (fd);                                     \
  80         return -1;                                      \
  81       }                                                 \
  82     strncpy (pty_name, ptyname, sizeof (pty_name));     \
  83     pty_name[sizeof (pty_name) - 1] = 0;                \
  84     sigunblock (sigmask (SIGCHLD));                     \
  85   }
  86
  87 #else /* not HAVE_GRANTPT */
  88
  89 /* Letter to use in finding device name of first pty,
  90    if system supports pty's.  'p' means it is /dev/ptyp0  */
  91
  92 #define FIRST_PTY_LETTER 'p'
  93
  94 #endif  /* not HAVE_GRANDPT */
  95
  96 /*  Define HAVE_TERMIOS if the system provides POSIX-style
  97     functions and macros for terminal control.  */
  98
  99 #define HAVE_TERMIOS
 100
 101 /* Define HAVE_PTYS if the system supports pty devices. */
 102
 103 #define HAVE_PTYS
 104
 105 #define HAVE_SOCKETS
 106
 107 /* Define this symbol if your system has the functions bcopy, etc. */
 108
 109 #define BSTRING
 110
 111 /* subprocesses should be defined if you want to
 112    have code for asynchronous subprocesses
 113    (as used in M-x compile and M-x shell).
 114    This is generally OS dependent, and not supported
 115    under most USG systems. */
 116
 117 #define subprocesses
 118
 119 /* define MAIL_USE_FLOCK if the mailer uses flock
 120    to interlock access to /usr/spool/mail/$USER.
 121    The alternative is that a lock file named
 122    /usr/spool/mail/$USER.lock.  */
 123
 124 /* On GNU/Linux systems, both methods are used by various mail
 125    programs.  I assume that most people are using newer mailers that
 126    have heard of flock.  Change this if you need to. */
 127 /* Debian contains a patch which says: ``On Debian/GNU/Linux systems,
 128    configure gets the right answers, and that means *NOT* using flock.
 129    Using flock is guaranteed to be the wrong thing. See Debian Policy
 130    for details.'' and then uses `#ifdef DEBIAN'.  Unfortunately the
 131    Debian maintainer hasn't provided a clean fix for Emacs.
 132    movemail.c will use `maillock' when MAILDIR, HAVE_LIBMAIL and
 133    HAVE_MAILLOCK_H are defined, so the following appears to be the
 134    correct logic.  -- fx */
 135 /* We must check for HAVE_LIBLOCKFILE too, as movemail does.
 136    liblockfile is a Free Software replacement for libmail, used on
 137    Debian systems and elsewhere. -rfr */
 138
 139 #if !((defined (HAVE_LIBMAIL) || defined (HAVE_LIBLOCKFILE)) && \
 140       defined (HAVE_MAILLOCK_H))
 141 #define MAIL_USE_FLOCK
 142 #endif
 143
 144 /* Define CLASH_DETECTION if you want lock files to be written
 145    so that Emacs can tell instantly when you try to modify
 146    a file that someone else has modified in his Emacs.  */
 147
 148 #define CLASH_DETECTION
 149
 150 /* Here, on a separate page, add any special hacks needed
 151    to make Emacs work on this system.  For example,
 152    you might define certain system call names that don't
 153    exist on your system, or that do different things on
 154    your system and must be used only through an encapsulation
 155    (Which you should place, by convention, in sysdep.c).  */
 156 \f
 157 /* If you mount the proc file system somewhere other than /proc
 158    you will have to uncomment the following and make the proper
 159    changes */
 160
 161 /* #define LINUX_LDAV_FILE "/proc/loadavg" */
 162
 163 /* This is needed for dispnew.c:update_frame */
 164
 165 #ifdef emacs
 166 #include <stdio.h>  /* Get the definition of _IO_STDIO_H.  */
 167 #if defined(_IO_STDIO_H) || defined(_STDIO_USES_IOSTREAM)
 168 /* new C libio names */
 169 #define GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE) \
 170   ((FILE)->_IO_write_ptr - (FILE)->_IO_write_base)
 171 #else /* !_IO_STDIO_H */
 172 /* old C++ iostream names */
 173 #define GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE) \
 174   ((FILE)->_pptr - (FILE)->_pbase)
 175 #endif /* !_IO_STDIO_H */
 176 #endif /* emacs */
 177
 178 /* Ask GCC where to find libgcc.a.  */
 179 #define LIB_GCC `$(CC) $(C_SWITCH_X_SITE) -print-libgcc-file-name`
 180
 181 #define START_FILES pre-crt0.o /usr/lib/crt1.o /usr/lib/crti.o
 182
 183 /* Here is how to find X Windows.  LD_SWITCH_X_SITE_AUX gives an -R option
 184    says where to find X windows at run time.  */
 185
 186 #ifdef __mips__
 187 #define LD_SWITCH_SYSTEM -G 0 LD_SWITCH_X_SITE_AUX
 188 #else
 189 #define LD_SWITCH_SYSTEM LD_SWITCH_X_SITE_AUX
 190 #endif /* __mips__ */
 191
 192 /* Link temacs with -z nocombreloc so that unexec works right, whether or
 193    not -z combreloc is the default.  GNU ld ignores unknown -z KEYWORD
 194    switches, so this also works with older versions that don't implement
 195    -z combreloc.  */
 196 #define LD_SWITCH_SYSTEM_TEMACS -z nocombreloc
 197
 198 #ifdef emacs
 199 #define INTERRUPT_INPUT
 200 #endif
 201
 202 /* This is needed for sysdep.c */
 203
 204 #define NO_SIOCTL_H           /* don't have sioctl.h */
 205
 206 #define HAVE_WAIT_HEADER
 207
 208 #define SYSV_SYSTEM_DIR       /* use dirent.h */
 209
 210 #define POSIX                 /* affects getpagesize.h and systty.h */
 211 #define POSIX_SIGNALS
 212
 213 /* Best not to include -lg, unless it is last on the command line */
 214 #define LIBS_DEBUG
 215 #undef LIB_GCC
 216 #define LIB_GCC
 217 #define LIB_STANDARD -lgcc -lc -lgcc /usr/lib/crtn.o
 218
 219 /* Don't use -g in test compiles in configure.
 220    This is so we will use the same shared libs for that linking
 221    that are used when linking temacs.  */
 222 #ifdef THIS_IS_CONFIGURE
 223 #define C_DEBUG_SWITCH
 224 #endif
 225
 226 /* 21 Jun 06: Eric Hanchrow <offby1@blarg.net> says this works.  */
 227 #ifdef LINUX_SIGNALS_VIA_CHARACTERS_DOES_WORK
 228 #define SIGNALS_VIA_CHARACTERS
 229 #endif
 230
 231 /* Rob Malouf <malouf@csli.stanford.edu> says:
 232    SYSV IPC is standard a standard part of Linux since version 0.99pl10,
 233    and is a very common addition to previous versions.  */
 234
 235 #ifdef TERM
 236 #define LIBS_SYSTEM -lclient
 237 #define C_SWITCH_SYSTEM -D_BSD_SOURCE -I/usr/src/term
 238 #else
 239 /* alane@wozzle.linet.org says that -lipc is not a separate library,
 240    since libc-4.4.1.  So -lipc was deleted.  */
 241 #define LIBS_SYSTEM
 242 /* _BSD_SOURCE is redundant, at least in glibc2, since we define
 243    _GNU_SOURCE.  Left in in case it's relevant to libc5 systems and
 244    anyone's still using Emacs on those.  --fx 2002-12-14  */
 245 #define C_SWITCH_SYSTEM -D_BSD_SOURCE
 246 #endif
 247
 248 /* Paul Abrahams <abrahams@equinox.shaysnet.com> says this is needed.  */
 249 #define LIB_MOTIF -lXm -lXpm
 250
 251 #ifdef HAVE_LIBNCURSES
 252 #define TERMINFO
 253 #define LIBS_TERMCAP -lncurses
 254 #endif
 255
 256 #define HAVE_SYSVIPC
 257
 258 #define UNEXEC unexelf.o
 259
 260 #define A_TEXT_OFFSET(hdr) (N_MAGIC(hdr) == QMAGIC ? sizeof (struct exec) : 0)
 261 #define A_TEXT_SEEK(hdr) (N_TXTOFF(hdr) + A_TEXT_OFFSET(hdr))
 262 #define ADJUST_EXEC_HEADER \
 263   unexec_text_start = N_TXTADDR(ohdr) + A_TEXT_OFFSET(ohdr)
 264
 265 /* This is to work around mysterious gcc failures in some system versions.
 266    It is unlikely that Emacs changes will work around this problem;
 267    therefore, this should remain permanently.  */
 268 #ifndef HAVE_XRMSETDATABASE
 269 #define HAVE_XRMSETDATABASE
 270 #endif
 271
 272 /* Use BSD process groups, but use setpgid() instead of setpgrp() to
 273    actually set a process group. */
 274
 275 #define BSD_PGRPS
 276
 277 #define NARROWPROTO 1
 278
 279 /* Use mmap directly for allocating larger buffers.  */
 280 #ifdef DOUG_LEA_MALLOC
 281 #undef REL_ALLOC
 282 #endif
 283
 284 /* Tell that garbage collector that setjmp is known to save all
 285    registers relevant for conservative garbage collection in the
 286    jmp_buf.  */
 287 /* Not all the architectures are tested, but there are Debian packages
 288    for SCM and/or Guile on them, so the technique must work.  See also
 289    comments in alloc.c concerning setjmp and gcc.  Fixme:  it's
 290    probably safe to make this conditional just on GCC, except for ia64
 291    register window-flushing.  */
 292 /* Don't use #cpu here since in newest development versions of GCC,
 293    we must call cpp with -traditional, and that disables #cpu.  */
 294
 295 #if defined __i386__ || defined __sparc__ || defined __mc68000__ \
 296     || defined __alpha__ || defined __mips__ || defined __s390__ \
 297     || defined __arm__ || defined __powerpc__ || defined __amd64__ \
 298     || defined __ia64__
 299 #define GC_SETJMP_WORKS 1
 300 #define GC_MARK_STACK GC_MAKE_GCPROS_NOOPS
 301 #ifdef __mc68000__
 302 #define GC_LISP_OBJECT_ALIGNMENT 2
 303 #endif
 304 #ifdef __ia64__
 305 #define GC_MARK_SECONDARY_STACK()                               \
 306   do {                                                          \
 307     extern void *__libc_ia64_register_backing_store_base;       \
 308     __builtin_ia64_flushrs ();                                  \
 309     mark_memory (__libc_ia64_register_backing_store_base,       \
 310                  __builtin_ia64_bsp (), 0);                     \
 311   } while (0)
 312 #endif
 313 #endif
 314
 315 /* arch-tag: 6244ea2a-abd0-44ec-abec-ff3dcc9afea9
 316    (do not change this comment) */