src/s/gnu-linux.h

   1 /* This file is the configuration file for Linux-based GNU systems
   2    Copyright (C) 1985, 86, 92, 94, 96, 1999 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Emacs.
   5
   6 GNU Emacs is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Emacs is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Emacs; see the file COPYING.  If not, write to
  18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  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 UNIPLUS */
  30 /* #define USG5 */
  31 #define USG
  32 /* #define BSD_SYSTEM */
  33 #define 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 /* Check the version number of Linux--if it is at least 1.2.0,
  41    it is safe to use SIGIO.  */
  42 #ifndef NOT_C_CODE
  43 #ifdef emacs
  44 #ifdef HAVE_LINUX_VERSION_H
  45 #include <linux/version.h>
  46
  47 #if LINUX_VERSION_CODE > 0x10200
  48 #define LINUX_SIGIO_DOES_WORK
  49 #endif /* LINUX_VERSION_CODE > 0x10200 */
  50 #if LINUX_VERSION_CODE >= 0x20000
  51 #define LINUX_MAP_SHARED_DOES_WORK
  52 #endif /* LINUX_VERSION_CODE >= 0x20000 */
  53 #endif /* HAVE_LINUX_VERSION_H */
  54 #endif /* emacs */
  55 #endif /* NOT_C_CODE */
  56
  57 #if defined HAVE_GRANTPT
  58 #define UNIX98_PTYS
  59
  60 /* Run only once.  We need a `for'-loop because the code uses
  61    `continue'.  */
  62
  63 #define PTY_ITERATION   for (i = 0; i < 1; i++)
  64
  65 #ifdef HAVE_GETPT
  66 #define PTY_NAME_SPRINTF
  67 #define PTY_OPEN fd = getpt ()
  68 #else /* not HAVE_GETPT */
  69 #define PTY_NAME_SPRINTF strcpy (pty_name, "/dev/ptmx");
  70 #endif /* not HAVE_GETPT */
  71
  72 /* Note that grantpt and unlockpt may fork.  We must block SIGCHLD to
  73    prevent sigchld_handler from intercepting the child's death.  */
  74
  75 #define PTY_TTY_NAME_SPRINTF                            \
  76   {                                                     \
  77     char *ptyname;                                      \
  78                                                         \
  79     sigblock (sigmask (SIGCHLD));                       \
  80     if (grantpt (fd) == -1 || unlockpt (fd) == -1       \
  81         || !(ptyname = ptsname(fd)))                    \
  82       {                                                 \
  83         sigunblock (sigmask (SIGCHLD));                 \
  84         close (fd);                                     \
  85         return -1;                                      \
  86       }                                                 \
  87     strncpy (pty_name, ptyname, sizeof (pty_name));     \
  88     pty_name[sizeof (pty_name) - 1] = 0;                \
  89     sigunblock (sigmask (SIGCHLD));                     \
  90   }
  91
  92 #else /* not HAVE_GRANTPT */
  93
  94 /* Letter to use in finding device name of first pty,
  95    if system supports pty's.  'p' means it is /dev/ptyp0  */
  96
  97 #define FIRST_PTY_LETTER 'p'
  98
  99 #endif  /* not HAVE_GRANDPT */
 100
 101 /*  Define HAVE_TERMIOS if the system provides POSIX-style
 102     functions and macros for terminal control.  */
 103
 104 #define HAVE_TERMIOS
 105
 106 /* Define HAVE_PTYS if the system supports pty devices. */
 107
 108 #define HAVE_PTYS
 109
 110 #define HAVE_SOCKETS
 111
 112 /* Define this symbol if your system has the functions bcopy, etc. */
 113
 114 #define BSTRING
 115
 116 /* subprocesses should be defined if you want to
 117    have code for asynchronous subprocesses
 118    (as used in M-x compile and M-x shell).
 119    This is generally OS dependent, and not supported
 120    under most USG systems. */
 121
 122 #define subprocesses
 123
 124 /* define MAIL_USE_FLOCK if the mailer uses flock
 125    to interlock access to /usr/spool/mail/$USER.
 126    The alternative is that a lock file named
 127    /usr/spool/mail/$USER.lock.  */
 128
 129 /* On GNU/Linux systems, both methods are used by various mail
 130    programs.  I assume that most people are using newer mailers that
 131    have heard of flock.  Change this if you need to. */
 132
 133 #define MAIL_USE_FLOCK
 134
 135 /* Define CLASH_DETECTION if you want lock files to be written
 136    so that Emacs can tell instantly when you try to modify
 137    a file that someone else has modified in his Emacs.  */
 138
 139 #define CLASH_DETECTION
 140
 141 /* Here, on a separate page, add any special hacks needed
 142    to make Emacs work on this system.  For example,
 143    you might define certain system call names that don't
 144    exist on your system, or that do different things on
 145    your system and must be used only through an encapsulation
 146    (Which you should place, by convention, in sysdep.c).  */
 147 \f
 148 /* If you mount the proc file system somewhere other than /proc
 149    you will have to uncomment the following and make the proper
 150    changes */
 151
 152 /* #define LINUX_LDAV_FILE "/proc/loadavg" */
 153
 154 /* This is needed for dispnew.c:update_frame */
 155
 156 #ifdef emacs
 157 #include <stdio.h>  /* Get the definition of _IO_STDIO_H.  */
 158 #if defined(_IO_STDIO_H) || defined(_STDIO_USES_IOSTREAM)
 159 /* new C libio names */
 160 #define GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE) \
 161   ((FILE)->_IO_write_ptr - (FILE)->_IO_write_base)
 162 #else /* !_IO_STDIO_H */
 163 /* old C++ iostream names */
 164 #define GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE) \
 165   ((FILE)->_pptr - (FILE)->_pbase)
 166 #endif /* !_IO_STDIO_H */
 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 #ifndef __ELF__
 173 /* GNU/Linux usually has crt0.o in a non-standard place */
 174 #define START_FILES pre-crt0.o /usr/lib/crt0.o
 175 #else
 176 #define START_FILES pre-crt0.o /usr/lib/crt1.o /usr/lib/crti.o
 177 #endif
 178
 179 #ifdef __ELF__
 180 /* Here is how to find X Windows.  LD_SWITCH_X_SITE_AUX gives an -R option
 181    says where to find X windows at run time.  */
 182
 183 #ifdef __mips__
 184 #define LD_SWITCH_SYSTEM -G 0 LD_SWITCH_X_SITE_AUX
 185 #else
 186 #define LD_SWITCH_SYSTEM LD_SWITCH_X_SITE_AUX
 187 #endif /* __mips__ */
 188 #endif /* __ELF__ */
 189
 190 /* As of version 1.1.51, Linux did not actually implement SIGIO.
 191    But it works in newer versions.  */
 192 #ifdef emacs
 193 #ifdef LINUX_SIGIO_DOES_WORK
 194 #define INTERRUPT_INPUT
 195 #else
 196 #define BROKEN_SIGIO
 197 /* Some versions of Linux define SIGURG and SIGPOLL as aliases for SIGIO.
 198    This prevents lossage in process.c.  */
 199 #define BROKEN_SIGURG
 200 #define BROKEN_SIGPOLL
 201 #endif
 202 #endif
 203
 204 /* This is needed for sysdep.c */
 205
 206 #define NO_SIOCTL_H           /* don't have sioctl.h */
 207
 208 #define HAVE_WAIT_HEADER
 209
 210 #define SYSV_SYSTEM_DIR       /* use dirent.h */
 211
 212 #define POSIX                 /* affects getpagesize.h and systty.h */
 213 #define POSIX_SIGNALS
 214
 215 /* Best not to include -lg, unless it is last on the command line */
 216 #define LIBS_DEBUG
 217 #ifndef __ELF__
 218 #define LIB_STANDARD -lc /* avoid -lPW */
 219 #else
 220 #undef LIB_GCC
 221 #define LIB_GCC
 222 #define LIB_STANDARD -lgcc -lc -lgcc /usr/lib/crtn.o
 223 #endif
 224
 225 /* Don't use -g in test compiles in configure.
 226    This is so we will use the same shared libs for that linking
 227    that are used when linking temacs.  */
 228 #ifdef THIS_IS_CONFIGURE
 229 #define C_DEBUG_SWITCH
 230 #endif
 231
 232 /* Let's try this out, just in case.
 233    Nah.  Rik Faith <faith@cs.unc.edu> says it doesn't work well.  */
 234 /* #define SIGNALS_VIA_CHARACTERS */
 235
 236 /* Rob Malouf <malouf@csli.stanford.edu> says:
 237    SYSV IPC is standard a standard part of Linux since version 0.99pl10,
 238    and is a very common addition to previous versions.  */
 239
 240 #ifdef TERM
 241 #define LIBS_SYSTEM -lclient
 242 #define C_SWITCH_SYSTEM -D_BSD_SOURCE -I/usr/src/term
 243 #else
 244 /* alane@wozzle.linet.org says that -lipc is not a separate library,
 245    since libc-4.4.1.  So -lipc was deleted.  */
 246 #define LIBS_SYSTEM
 247 #define C_SWITCH_SYSTEM -D_BSD_SOURCE
 248 #endif
 249
 250 /* Paul Abrahams <abrahams@equinox.shaysnet.com> says this is needed.  */
 251 #define LIB_MOTIF -lXm -lXpm
 252
 253 #ifdef HAVE_LIBNCURSES
 254 #define TERMINFO
 255 #define LIBS_TERMCAP -lncurses
 256 #endif
 257
 258 #define HAVE_SYSVIPC
 259
 260 #ifdef __ELF__
 261 #define UNEXEC unexelf.o
 262 #ifndef LINUX_MAP_SHARED_DOES_WORK
 263 #define UNEXEC_USE_MAP_PRIVATE
 264 #endif
 265 #endif
 266
 267 #ifdef LINUX_QMAGIC
 268
 269 #define HAVE_TEXT_START
 270 #define UNEXEC unexsunos4.o
 271 #define N_PAGSIZ(x) PAGE_SIZE
 272
 273 #else /* not LINUX_QMAGIC */
 274
 275 #define A_TEXT_OFFSET(hdr) (N_MAGIC(hdr) == QMAGIC ? sizeof (struct exec) : 0)
 276 #define A_TEXT_SEEK(hdr) (N_TXTOFF(hdr) + A_TEXT_OFFSET(hdr))
 277 #define ADJUST_EXEC_HEADER \
 278   unexec_text_start = N_TXTADDR(ohdr) + A_TEXT_OFFSET(ohdr)
 279
 280 #endif /* not LINUX_QMAGIC */
 281
 282 #if 0
 283 /* In 19.23 and 19.24, configure sometimes fails to define these.
 284    It has to do with the fact that configure uses CFLAGS when linking
 285    while Makefile.in.in (erroneously) fails to do so when linking temacs.  */
 286 #ifndef HAVE_GETTIMEOFDAY
 287 #define HAVE_GETTIMEOFDAY
 288 #endif
 289 #ifndef HAVE_MKDIR
 290 #define HAVE_MKDIR
 291 #endif
 292 #ifndef HAVE_RMDIR
 293 #define HAVE_RMDIR
 294 #endif
 295 #ifndef HAVE_XSCREENNUMBEROFSCREEN
 296 #define HAVE_XSCREENNUMBEROFSCREEN
 297 #endif
 298 #endif /* 0 */
 299
 300 /* This is to work around mysterious gcc failures in some system versions.
 301    It is unlikely that Emacs changes will work around this problem;
 302    therefore, this should remain permanently.  */
 303 #ifndef HAVE_XRMSETDATABASE
 304 #define HAVE_XRMSETDATABASE
 305 #endif
 306
 307 /* The regex.o routines are a part of the GNU C-library used with Linux.  */
 308 /* However, sometimes they disagree with the src/regex.h that comes with Emacs,
 309    and that can make trouble in etags.c because it gets the regex.h from Emacs
 310    and the function definitions in libc.  So turn this off.  */
 311 /* #define REGEXP_IN_LIBC */
 312
 313 /* Use BSD process groups, but use setpgid() instead of setpgrp() to
 314    actually set a process group. */
 315
 316 #define BSD_PGRPS
 317
 318 #define NARROWPROTO 1
 319
 320 /* Use mmap directly for allocating larger buffers.  */
 321 #ifdef DOUG_LEA_MALLOC
 322 #undef REL_ALLOC
 323 #endif
 324
 325 /* Tell that garbage collector that setjmp is known to save all
 326    registers relevant for conservative garbage collection in the
 327    jmp_buf.  */
 328 /* m68k and alpha aren't tested, but there are Debian packages for SCM
 329    and/or Guile on them, so the technique must work.  */
 330
 331 /* Don't use #cpu here since in newest development versions of GCC,
 332    we must call cpp with -traditional, and that disables #cpu.  */
 333
 334 #if defined __i386__ || defined __sparc__ || defined __m68k__ || defined __alpha__
 335 #define GC_SETJMP_WORKS 1
 336 #define GC_MARK_STACK GC_MAKE_GCPROS_NOOPS
 337 #endif