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 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 */
  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 #endif /* HAVE_LINUX_VERSION_H */
  51 #endif /* emacs */
  52 #endif /* NOT_C_CODE */
  53
  54 /* Letter to use in finding device name of first pty,
  55   if system supports pty's.  'p' means it is /dev/ptyp0  */
  56
  57 #define FIRST_PTY_LETTER 'p'
  58
  59 /*
  60  *      Define HAVE_TERMIOS if the system provides POSIX-style
  61  *      functions and macros for terminal control.
  62  */
  63
  64 #define HAVE_TERMIOS
  65
  66 /*
  67  *      Define HAVE_PTYS if the system supports pty devices.
  68  */
  69
  70 #define HAVE_PTYS
  71
  72 /* Uncomment this later when other problems are dealt with -mkj */
  73
  74 #define HAVE_SOCKETS
  75
  76 /* Define this symbol if your system has the functions bcopy, etc. */
  77
  78 #define BSTRING
  79
  80 /* subprocesses should be defined if you want to
  81    have code for asynchronous subprocesses
  82    (as used in M-x compile and M-x shell).
  83    This is generally OS dependent, and not supported
  84    under most USG systems. */
  85
  86 #define subprocesses
  87
  88 /* define MAIL_USE_FLOCK if the mailer uses flock
  89    to interlock access to /usr/spool/mail/$USER.
  90    The alternative is that a lock file named
  91    /usr/spool/mail/$USER.lock.  */
  92
  93 /* On GNU/Linux systems, both methods are used by various mail
  94    programs.  I assume that most people are using newer mailers that
  95    have heard of flock.  Change this if you need to. */
  96
  97 #define MAIL_USE_FLOCK
  98
  99 /* Define CLASH_DETECTION if you want lock files to be written
 100    so that Emacs can tell instantly when you try to modify
 101    a file that someone else has modified in his Emacs.  */
 102
 103 #define CLASH_DETECTION
 104
 105 /* Here, on a separate page, add any special hacks needed
 106    to make Emacs work on this system.  For example,
 107    you might define certain system call names that don't
 108    exist on your system, or that do different things on
 109    your system and must be used only through an encapsulation
 110    (Which you should place, by convention, in sysdep.c).  */
 111 \f
 112 /* On POSIX systems the system calls are interruptible by signals
 113  that the user program has elected to catch.  Thus the system call
 114  must be retried in these cases.  To handle this without massive
 115  changes in the source code, we remap the standard system call names
 116  to names for our own functions in sysdep.c that do the system call
 117  with retries. */
 118
 119 #define read sys_read
 120 #define write sys_write
 121 #define open sys_open
 122 #define close sys_close
 123
 124 #define INTERRUPTIBLE_OPEN
 125 #define INTERRUPTIBLE_CLOSE
 126 #define INTERRUPTIBLE_IO
 127
 128 /* If you mount the proc file system somewhere other than /proc
 129    you will have to uncomment the following and make the proper
 130    changes */
 131
 132 /* #define LINUX_LDAV_FILE "/proc/loadavg" */
 133
 134 /* This is needed for dispnew.c:update_frame */
 135
 136 #ifdef emacs
 137 #include <stdio.h>  /* Get the definition of _IO_STDIO_H.  */
 138 #if defined(_IO_STDIO_H) || defined(_STDIO_USES_IOSTREAM)
 139 /* new C libio names */
 140 #define GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE) \
 141   ((FILE)->_IO_write_ptr - (FILE)->_IO_write_base)
 142 #else /* !_IO_STDIO_H */
 143 /* old C++ iostream names */
 144 #define GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE) \
 145   ((FILE)->_pptr - (FILE)->_pbase)
 146 #endif /* !_IO_STDIO_H */
 147 #endif /* emacs */
 148
 149 /* Ask GCC where to find libgcc.a.  */
 150 #define LIB_GCC `$(CC) $(C_SWITCH_X_SITE) -print-libgcc-file-name`
 151
 152 #ifndef __ELF__
 153 /* GNU/Linux usually has crt0.o in a non-standard place */
 154 #define START_FILES pre-crt0.o /usr/lib/crt0.o
 155 #else
 156 #define START_FILES pre-crt0.o /usr/lib/crt1.o /usr/lib/crti.o
 157 #endif
 158
 159 #ifdef __ELF__
 160 /* Here is how to find X Windows.  LD_SWITCH_X_SITE_AUX gives an -R option
 161    says where to find X windows at run time.  */
 162
 163 #define LD_SWITCH_SYSTEM LD_SWITCH_X_SITE_AUX
 164 #endif /* __ELF__ */
 165
 166 /* As of version 1.1.51, Linux did not actually implement SIGIO.
 167    But it works in newer versions.  */
 168 /* Here we assume that signal.h is already included.  */
 169 #ifdef emacs
 170 #ifdef LINUX_SIGIO_DOES_WORK
 171 #define INTERRUPT_INPUT
 172 #else
 173 #undef SIGIO
 174 /* Some versions of Linux define SIGURG and SIGPOLL as aliases for SIGIO.
 175    This prevents lossage in process.c.  */
 176 #undef SIGURG
 177 #undef SIGPOLL
 178 #endif
 179 #endif
 180
 181 /* This is needed for sysdep.c */
 182
 183 #define NO_SIOCTL_H           /* don't have sioctl.h */
 184
 185 #define HAVE_VFORK
 186 #define HAVE_SYS_SIGLIST
 187 #define HAVE_GETWD            /* cure conflict with getcwd? */
 188 #define HAVE_WAIT_HEADER
 189
 190 #define SYSV_SYSTEM_DIR       /* use dirent.h */
 191
 192 #define POSIX                 /* affects getpagesize.h and systty.h */
 193 #define POSIX_SIGNALS
 194
 195 /* Best not to include -lg, unless it is last on the command line */
 196 #define LIBS_DEBUG
 197 #ifndef __ELF__
 198 #define LIB_STANDARD -lc /* avoid -lPW */
 199 #else
 200 #undef LIB_GCC
 201 #define LIB_GCC
 202 #define LIB_STANDARD -lgcc -lc -lgcc /usr/lib/crtn.o
 203 #endif
 204
 205 /* Don't use -g in test compiles in configure.
 206    This is so we will use the same shared libs for that linking
 207    that are used when linking temacs.  */
 208 #ifdef THIS_IS_CONFIGURE
 209 #define C_DEBUG_SWITCH
 210 #endif
 211
 212 /* Let's try this out, just in case.
 213    Nah.  Rik Faith <faith@cs.unc.edu> says it doesn't work well.  */
 214 /* #define SIGNALS_VIA_CHARACTERS */
 215
 216 /* Rob Malouf <malouf@csli.stanford.edu> says:
 217    SYSV IPC is standard a standard part of Linux since version 0.99pl10,
 218    and is a very common addition to previous versions.  */
 219
 220 #ifdef TERM
 221 #define LIBS_SYSTEM -lclient
 222 #define C_SWITCH_SYSTEM -D_BSD_SOURCE -I/usr/src/term
 223 #else
 224 /* alane@wozzle.linet.org says that -lipc is not a separate library,
 225    since libc-4.4.1.  So -lipc was deleted.  */
 226 #define LIBS_SYSTEM
 227 #define C_SWITCH_SYSTEM -D_BSD_SOURCE
 228 #endif
 229
 230 /* Paul Abrahams <abrahams@equinox.shaysnet.com> says this is needed.  */
 231 #define LIB_MOTIF -lXm -lXpm
 232
 233 #ifdef HAVE_LIBNCURSES
 234 #define TERMINFO
 235 #define LIBS_TERMCAP -lncurses
 236 #endif
 237
 238 #define HAVE_SYSVIPC
 239
 240 #ifdef __ELF__
 241 #define UNEXEC unexelf.o
 242 #define UNEXEC_USE_MAP_PRIVATE
 243 #endif
 244
 245 #ifdef LINUX_QMAGIC
 246
 247 #define HAVE_TEXT_START
 248 #define UNEXEC unexsunos4.o
 249 #define N_PAGSIZ(x) PAGE_SIZE
 250
 251 #else /* not LINUX_QMAGIC */
 252
 253 #define A_TEXT_OFFSET(hdr) (N_MAGIC(hdr) == QMAGIC ? sizeof (struct exec) : 0)
 254 #define A_TEXT_SEEK(hdr) (N_TXTOFF(hdr) + A_TEXT_OFFSET(hdr))
 255 #define ADJUST_EXEC_HEADER \
 256   unexec_text_start = N_TXTADDR(ohdr) + A_TEXT_OFFSET(ohdr)
 257
 258 #endif /* not LINUX_QMAGIC */
 259
 260 #if 0
 261 /* In 19.23 and 19.24, configure sometimes fails to define these.
 262    It has to do with the fact that configure uses CFLAGS when linking
 263    while Makefile.in.in (erroneously) fails to do so when linking temacs.  */
 264 #ifndef HAVE_GETTIMEOFDAY
 265 #define HAVE_GETTIMEOFDAY
 266 #endif
 267 #ifndef HAVE_MKDIR
 268 #define HAVE_MKDIR
 269 #endif
 270 #ifndef HAVE_RMDIR
 271 #define HAVE_RMDIR
 272 #endif
 273 #ifndef HAVE_XSCREENNUMBEROFSCREEN
 274 #define HAVE_XSCREENNUMBEROFSCREEN
 275 #endif
 276 #endif /* 0 */
 277
 278 /* This is to work around mysterious gcc failures in some system versions.
 279    It is unlikely that Emacs changes will work around this problem;
 280    therefore, this should remain permanently.  */
 281 #ifndef HAVE_XRMSETDATABASE
 282 #define HAVE_XRMSETDATABASE
 283 #endif
 284
 285 /* The regex.o routines are a part of the GNU C-library used with Linux.  */
 286 /* However, sometimes they disagree with the src/regex.h that comes with Emacs,
 287    and that can make trouble in etags.c because it gets the regex.h from Emacs
 288    and the function definitions in libc.  So turn this off.  */
 289 /* #define REGEXP_IN_LIBC */
 290
 291 /* Use BSD process groups, but use setpgid() instead of setpgrp() to
 292    actually set a process group. */
 293
 294 #define BSD_PGRPS
 295 #define setpgrp(pid,pgid) setpgid((pid),(pgid))