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_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 /* On POSIX systems the system calls are interruptible by signals
 116  that the user program has elected to catch.  Thus the system call
 117  must be retried in these cases.  To handle this without massive
 118  changes in the source code, we remap the standard system call names
 119  to names for our own functions in sysdep.c that do the system call
 120  with retries. */
 121
 122 #define read sys_read
 123 #define write sys_write
 124 #define open sys_open
 125 #define close sys_close
 126
 127 #define INTERRUPTIBLE_OPEN
 128 #define INTERRUPTIBLE_CLOSE
 129 #define INTERRUPTIBLE_IO
 130
 131 /* If you mount the proc file system somewhere other than /proc
 132    you will have to uncomment the following and make the proper
 133    changes */
 134
 135 /* #define LINUX_LDAV_FILE "/proc/loadavg" */
 136
 137 /* This is needed for dispnew.c:update_frame */
 138
 139 #ifdef emacs
 140 #include <stdio.h>  /* Get the definition of _IO_STDIO_H.  */
 141 #if defined(_IO_STDIO_H) || defined(_STDIO_USES_IOSTREAM)
 142 /* new C libio names */
 143 #define GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE) \
 144   ((FILE)->_IO_write_ptr - (FILE)->_IO_write_base)
 145 #else /* !_IO_STDIO_H */
 146 /* old C++ iostream names */
 147 #define GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE) \
 148   ((FILE)->_pptr - (FILE)->_pbase)
 149 #endif /* !_IO_STDIO_H */
 150 #endif /* emacs */
 151
 152 /* Ask GCC where to find libgcc.a.  */
 153 #define LIB_GCC `$(CC) $(C_SWITCH_X_SITE) -print-libgcc-file-name`
 154
 155 #ifndef __ELF__
 156 /* GNU/Linux usually has crt0.o in a non-standard place */
 157 #define START_FILES pre-crt0.o /usr/lib/crt0.o
 158 #else
 159 #define START_FILES pre-crt0.o /usr/lib/crt1.o /usr/lib/crti.o
 160 #endif
 161
 162 #ifdef __ELF__
 163 /* Here is how to find X Windows.  LD_SWITCH_X_SITE_AUX gives an -R option
 164    says where to find X windows at run time.  */
 165
 166 #ifdef __mips__
 167 #define LD_SWITCH_SYSTEM -G 0 LD_SWITCH_X_SITE_AUX
 168 #else
 169 #define LD_SWITCH_SYSTEM LD_SWITCH_X_SITE_AUX
 170 #endif /* __mips__ */
 171 #endif /* __ELF__ */
 172
 173 /* As of version 1.1.51, Linux did not actually implement SIGIO.
 174    But it works in newer versions.  */
 175 /* Here we assume that signal.h is already included.  */
 176 #ifdef emacs
 177 #ifdef LINUX_SIGIO_DOES_WORK
 178 #define INTERRUPT_INPUT
 179 #else
 180 #undef SIGIO
 181 /* Some versions of Linux define SIGURG and SIGPOLL as aliases for SIGIO.
 182    This prevents lossage in process.c.  */
 183 #undef SIGURG
 184 #undef SIGPOLL
 185 #endif
 186 #endif
 187
 188 /* This is needed for sysdep.c */
 189
 190 #define NO_SIOCTL_H           /* don't have sioctl.h */
 191
 192 #define HAVE_VFORK
 193 #define HAVE_SYS_SIGLIST
 194 #define HAVE_GETWD            /* cure conflict with getcwd? */
 195 #define HAVE_WAIT_HEADER
 196
 197 #define SYSV_SYSTEM_DIR       /* use dirent.h */
 198
 199 #define POSIX                 /* affects getpagesize.h and systty.h */
 200 #define POSIX_SIGNALS
 201
 202 /* Best not to include -lg, unless it is last on the command line */
 203 #define LIBS_DEBUG
 204 #ifndef __ELF__
 205 #define LIB_STANDARD -lc /* avoid -lPW */
 206 #else
 207 #undef LIB_GCC
 208 #define LIB_GCC
 209 #define LIB_STANDARD -lgcc -lc -lgcc /usr/lib/crtn.o
 210 #endif
 211
 212 /* Don't use -g in test compiles in configure.
 213    This is so we will use the same shared libs for that linking
 214    that are used when linking temacs.  */
 215 #ifdef THIS_IS_CONFIGURE
 216 #define C_DEBUG_SWITCH
 217 #endif
 218
 219 /* Let's try this out, just in case.
 220    Nah.  Rik Faith <faith@cs.unc.edu> says it doesn't work well.  */
 221 /* #define SIGNALS_VIA_CHARACTERS */
 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 #define C_SWITCH_SYSTEM -D_BSD_SOURCE
 235 #endif
 236
 237 /* Paul Abrahams <abrahams@equinox.shaysnet.com> says this is needed.  */
 238 #define LIB_MOTIF -lXm -lXpm
 239
 240 #ifdef HAVE_LIBNCURSES
 241 #define TERMINFO
 242 #define LIBS_TERMCAP -lncurses
 243 #endif
 244
 245 #define HAVE_SYSVIPC
 246
 247 #ifdef __ELF__
 248 #define UNEXEC unexelf.o
 249 #ifndef LINUX_MAP_SHARED_DOES_WORK
 250 #define UNEXEC_USE_MAP_PRIVATE
 251 #endif
 252 #endif
 253
 254 #ifdef LINUX_QMAGIC
 255
 256 #define HAVE_TEXT_START
 257 #define UNEXEC unexsunos4.o
 258 #define N_PAGSIZ(x) PAGE_SIZE
 259
 260 #else /* not LINUX_QMAGIC */
 261
 262 #define A_TEXT_OFFSET(hdr) (N_MAGIC(hdr) == QMAGIC ? sizeof (struct exec) : 0)
 263 #define A_TEXT_SEEK(hdr) (N_TXTOFF(hdr) + A_TEXT_OFFSET(hdr))
 264 #define ADJUST_EXEC_HEADER \
 265   unexec_text_start = N_TXTADDR(ohdr) + A_TEXT_OFFSET(ohdr)
 266
 267 #endif /* not LINUX_QMAGIC */
 268
 269 #if 0
 270 /* In 19.23 and 19.24, configure sometimes fails to define these.
 271    It has to do with the fact that configure uses CFLAGS when linking
 272    while Makefile.in.in (erroneously) fails to do so when linking temacs.  */
 273 #ifndef HAVE_GETTIMEOFDAY
 274 #define HAVE_GETTIMEOFDAY
 275 #endif
 276 #ifndef HAVE_MKDIR
 277 #define HAVE_MKDIR
 278 #endif
 279 #ifndef HAVE_RMDIR
 280 #define HAVE_RMDIR
 281 #endif
 282 #ifndef HAVE_XSCREENNUMBEROFSCREEN
 283 #define HAVE_XSCREENNUMBEROFSCREEN
 284 #endif
 285 #endif /* 0 */
 286
 287 /* This is to work around mysterious gcc failures in some system versions.
 288    It is unlikely that Emacs changes will work around this problem;
 289    therefore, this should remain permanently.  */
 290 #ifndef HAVE_XRMSETDATABASE
 291 #define HAVE_XRMSETDATABASE
 292 #endif
 293
 294 /* The regex.o routines are a part of the GNU C-library used with Linux.  */
 295 /* However, sometimes they disagree with the src/regex.h that comes with Emacs,
 296    and that can make trouble in etags.c because it gets the regex.h from Emacs
 297    and the function definitions in libc.  So turn this off.  */
 298 /* #define REGEXP_IN_LIBC */
 299
 300 /* Use BSD process groups, but use setpgid() instead of setpgrp() to
 301    actually set a process group. */
 302
 303 #define BSD_PGRPS
 304 #define setpgrp(pid,pgid) setpgid(pid,pgid)
 305
 306 #define NARROWPROTO 1
 307
 308 /* Use mmap directly for allocating larger buffers.  */
 309 #ifdef DOUG_LEA_MALLOC
 310 #undef REL_ALLOC
 311 #endif