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