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