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 /* Letter to use in finding device name of first pty,
  58   if system supports pty's.  'p' means it is /dev/ptyp0  */
  59
  60 #define FIRST_PTY_LETTER 'p'
  61
  62 /*
  63  *      Define HAVE_TERMIOS if the system provides POSIX-style
  64  *      functions and macros for terminal control.
  65  */
  66
  67 #define HAVE_TERMIOS
  68
  69 /*
  70  *      Define HAVE_PTYS if the system supports pty devices.
  71  */
  72
  73 #define HAVE_PTYS
  74
  75 /* Uncomment this later when other problems are dealt with -mkj */
  76
  77 #define HAVE_SOCKETS
  78
  79 /* Define this symbol if your system has the functions bcopy, etc. */
  80
  81 #define BSTRING
  82
  83 /* subprocesses should be defined if you want to
  84    have code for asynchronous subprocesses
  85    (as used in M-x compile and M-x shell).
  86    This is generally OS dependent, and not supported
  87    under most USG systems. */
  88
  89 #define subprocesses
  90
  91 /* define MAIL_USE_FLOCK if the mailer uses flock
  92    to interlock access to /usr/spool/mail/$USER.
  93    The alternative is that a lock file named
  94    /usr/spool/mail/$USER.lock.  */
  95
  96 /* On GNU/Linux systems, both methods are used by various mail
  97    programs.  I assume that most people are using newer mailers that
  98    have heard of flock.  Change this if you need to. */
  99
 100 #define MAIL_USE_FLOCK
 101
 102 /* Define CLASH_DETECTION if you want lock files to be written
 103    so that Emacs can tell instantly when you try to modify
 104    a file that someone else has modified in his Emacs.  */
 105
 106 #define CLASH_DETECTION
 107
 108 /* Here, on a separate page, add any special hacks needed
 109    to make Emacs work on this system.  For example,
 110    you might define certain system call names that don't
 111    exist on your system, or that do different things on
 112    your system and must be used only through an encapsulation
 113    (Which you should place, by convention, in sysdep.c).  */
 114 \f
 115 /* If you mount the proc file system somewhere other than /proc
 116    you will have to uncomment the following and make the proper
 117    changes */
 118
 119 /* #define LINUX_LDAV_FILE "/proc/loadavg" */
 120
 121 /* This is needed for dispnew.c:update_frame */
 122
 123 #ifdef emacs
 124 #include <stdio.h>  /* Get the definition of _IO_STDIO_H.  */
 125 #if defined(_IO_STDIO_H) || defined(_STDIO_USES_IOSTREAM)
 126 /* new C libio names */
 127 #define GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE) \
 128   ((FILE)->_IO_write_ptr - (FILE)->_IO_write_base)
 129 #else /* !_IO_STDIO_H */
 130 /* old C++ iostream names */
 131 #define GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE) \
 132   ((FILE)->_pptr - (FILE)->_pbase)
 133 #endif /* !_IO_STDIO_H */
 134 #endif /* emacs */
 135
 136 /* Ask GCC where to find libgcc.a.  */
 137 #define LIB_GCC `$(CC) $(C_SWITCH_X_SITE) -print-libgcc-file-name`
 138
 139 #ifndef __ELF__
 140 /* GNU/Linux usually has crt0.o in a non-standard place */
 141 #define START_FILES pre-crt0.o /usr/lib/crt0.o
 142 #else
 143 #define START_FILES pre-crt0.o /usr/lib/crt1.o /usr/lib/crti.o
 144 #endif
 145
 146 #ifdef __ELF__
 147 /* Here is how to find X Windows.  LD_SWITCH_X_SITE_AUX gives an -R option
 148    says where to find X windows at run time.  */
 149
 150 #ifdef __mips__
 151 #define LD_SWITCH_SYSTEM -G 0 LD_SWITCH_X_SITE_AUX
 152 #else
 153 #define LD_SWITCH_SYSTEM LD_SWITCH_X_SITE_AUX
 154 #endif /* __mips__ */
 155 #endif /* __ELF__ */
 156
 157 /* As of version 1.1.51, Linux did not actually implement SIGIO.
 158    But it works in newer versions.  */
 159 #ifdef emacs
 160 #ifdef LINUX_SIGIO_DOES_WORK
 161 #define INTERRUPT_INPUT
 162 #else
 163 #define BROKEN_SIGIO
 164 /* Some versions of Linux define SIGURG and SIGPOLL as aliases for SIGIO.
 165    This prevents lossage in process.c.  */
 166 #define BROKEN_SIGURG
 167 #define BROKEN_SIGPOLL
 168 #endif
 169 #endif
 170
 171 /* This is needed for sysdep.c */
 172
 173 #define NO_SIOCTL_H           /* don't have sioctl.h */
 174
 175 #define HAVE_VFORK
 176 #define HAVE_SYS_SIGLIST
 177 #define HAVE_GETWD            /* cure conflict with getcwd? */
 178 #define HAVE_WAIT_HEADER
 179
 180 #define SYSV_SYSTEM_DIR       /* use dirent.h */
 181
 182 #define POSIX                 /* affects getpagesize.h and systty.h */
 183 #define POSIX_SIGNALS
 184
 185 /* Best not to include -lg, unless it is last on the command line */
 186 #define LIBS_DEBUG
 187 #ifndef __ELF__
 188 #define LIB_STANDARD -lc /* avoid -lPW */
 189 #else
 190 #undef LIB_GCC
 191 #define LIB_GCC
 192 #define LIB_STANDARD -lgcc -lc -lgcc /usr/lib/crtn.o
 193 #endif
 194
 195 /* Don't use -g in test compiles in configure.
 196    This is so we will use the same shared libs for that linking
 197    that are used when linking temacs.  */
 198 #ifdef THIS_IS_CONFIGURE
 199 #define C_DEBUG_SWITCH
 200 #endif
 201
 202 /* Let's try this out, just in case.
 203    Nah.  Rik Faith <faith@cs.unc.edu> says it doesn't work well.  */
 204 /* #define SIGNALS_VIA_CHARACTERS */
 205
 206 /* Rob Malouf <malouf@csli.stanford.edu> says:
 207    SYSV IPC is standard a standard part of Linux since version 0.99pl10,
 208    and is a very common addition to previous versions.  */
 209
 210 #ifdef TERM
 211 #define LIBS_SYSTEM -lclient
 212 #define C_SWITCH_SYSTEM -D_BSD_SOURCE -I/usr/src/term
 213 #else
 214 /* alane@wozzle.linet.org says that -lipc is not a separate library,
 215    since libc-4.4.1.  So -lipc was deleted.  */
 216 #define LIBS_SYSTEM
 217 #define C_SWITCH_SYSTEM -D_BSD_SOURCE
 218 #endif
 219
 220 /* Paul Abrahams <abrahams@equinox.shaysnet.com> says this is needed.  */
 221 #define LIB_MOTIF -lXm -lXpm
 222
 223 #ifdef HAVE_LIBNCURSES
 224 #define TERMINFO
 225 #define LIBS_TERMCAP -lncurses
 226 #endif
 227
 228 #define HAVE_SYSVIPC
 229
 230 #ifdef __ELF__
 231 #define UNEXEC unexelf.o
 232 #ifndef LINUX_MAP_SHARED_DOES_WORK
 233 #define UNEXEC_USE_MAP_PRIVATE
 234 #endif
 235 #endif
 236
 237 #ifdef LINUX_QMAGIC
 238
 239 #define HAVE_TEXT_START
 240 #define UNEXEC unexsunos4.o
 241 #define N_PAGSIZ(x) PAGE_SIZE
 242
 243 #else /* not LINUX_QMAGIC */
 244
 245 #define A_TEXT_OFFSET(hdr) (N_MAGIC(hdr) == QMAGIC ? sizeof (struct exec) : 0)
 246 #define A_TEXT_SEEK(hdr) (N_TXTOFF(hdr) + A_TEXT_OFFSET(hdr))
 247 #define ADJUST_EXEC_HEADER \
 248   unexec_text_start = N_TXTADDR(ohdr) + A_TEXT_OFFSET(ohdr)
 249
 250 #endif /* not LINUX_QMAGIC */
 251
 252 #if 0
 253 /* In 19.23 and 19.24, configure sometimes fails to define these.
 254    It has to do with the fact that configure uses CFLAGS when linking
 255    while Makefile.in.in (erroneously) fails to do so when linking temacs.  */
 256 #ifndef HAVE_GETTIMEOFDAY
 257 #define HAVE_GETTIMEOFDAY
 258 #endif
 259 #ifndef HAVE_MKDIR
 260 #define HAVE_MKDIR
 261 #endif
 262 #ifndef HAVE_RMDIR
 263 #define HAVE_RMDIR
 264 #endif
 265 #ifndef HAVE_XSCREENNUMBEROFSCREEN
 266 #define HAVE_XSCREENNUMBEROFSCREEN
 267 #endif
 268 #endif /* 0 */
 269
 270 /* This is to work around mysterious gcc failures in some system versions.
 271    It is unlikely that Emacs changes will work around this problem;
 272    therefore, this should remain permanently.  */
 273 #ifndef HAVE_XRMSETDATABASE
 274 #define HAVE_XRMSETDATABASE
 275 #endif
 276
 277 /* The regex.o routines are a part of the GNU C-library used with Linux.  */
 278 /* However, sometimes they disagree with the src/regex.h that comes with Emacs,
 279    and that can make trouble in etags.c because it gets the regex.h from Emacs
 280    and the function definitions in libc.  So turn this off.  */
 281 /* #define REGEXP_IN_LIBC */
 282
 283 /* Use BSD process groups, but use setpgid() instead of setpgrp() to
 284    actually set a process group. */
 285
 286 #define BSD_PGRPS
 287 #define setpgrp(pid,pgid) setpgid(pid,pgid)
 288
 289 #define NARROWPROTO 1
 290
 291 /* Use mmap directly for allocating larger buffers.  */
 292 #ifdef DOUG_LEA_MALLOC
 293 #undef REL_ALLOC
 294 #endif