src/s/gnu-linux.h

   1 /* This file is the configuration file for GNU/Linux operating systems.
   2    Copyright (C) 1985, 1986, 1992, 1994 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 "linux"             /* All the best software is free. */
  39
  40 /* Emacs can read input using SIGIO and buffering characters itself,
  41    or using CBREAK mode and making C-g cause SIGINT.
  42    The choice is controlled by the variable interrupt_input.
  43    Define INTERRUPT_INPUT to make interrupt_input = 1 the default (use SIGIO)
  44
  45    SIGIO can be used only on systems that implement it (4.2 and 4.3).
  46    CBREAK mode has two disadvantages
  47      1) At least in 4.2, it is impossible to handle the Meta key properly.
  48         I hear that in system V this problem does not exist.
  49      2) Control-G causes output to be discarded.
  50         I do not know whether this can be fixed in system V.
  51
  52    Another method of doing input is planned but not implemented.
  53    It would have Emacs fork off a separate process
  54    to read the input and send it to the true Emacs process
  55    through a pipe.
  56 */
  57
  58 /* There have been suggestions made to add SIGIO to Linux.  If this
  59    is done, you may, at your discretion, uncomment the line below.
  60 */
  61
  62 /* #define INTERRUPT_INPUT */
  63
  64 /* Letter to use in finding device name of first pty,
  65   if system supports pty's.  'p' means it is /dev/ptyp0  */
  66
  67 #define FIRST_PTY_LETTER 'p'
  68
  69 /*
  70  *      Define HAVE_TERMIOS if the system provides POSIX-style
  71  *      functions and macros for terminal control.
  72  */
  73
  74 #define HAVE_TERMIOS
  75
  76 /*
  77  *      Define HAVE_PTYS if the system supports pty devices.
  78  */
  79
  80 #define HAVE_PTYS
  81
  82 /* Uncomment this later when other problems are dealt with -mkj */
  83
  84 #define HAVE_SOCKETS
  85
  86 /* Define this symbol if your system has the functions bcopy, etc. */
  87
  88 #define BSTRING
  89
  90 /* subprocesses should be defined if you want to
  91    have code for asynchronous subprocesses
  92    (as used in M-x compile and M-x shell).
  93    This is generally OS dependent, and not supported
  94    under most USG systems. */
  95
  96 #define subprocesses
  97
  98 /* define MAIL_USE_FLOCK if the mailer uses flock
  99    to interlock access to /usr/spool/mail/$USER.
 100    The alternative is that a lock file named
 101    /usr/spool/mail/$USER.lock.  */
 102
 103 /* Both are used in Linux by different mail programs.  I assume that most
 104    people are using newer mailers that have heard of flock.  Change this
 105    if you need to. */
 106
 107 #define MAIL_USE_FLOCK
 108
 109 /* Define CLASH_DETECTION if you want lock files to be written
 110    so that Emacs can tell instantly when you try to modify
 111    a file that someone else has modified in his Emacs.  */
 112
 113 #define CLASH_DETECTION
 114
 115 /* Here, on a separate page, add any special hacks needed
 116    to make Emacs work on this system.  For example,
 117    you might define certain system call names that don't
 118    exist on your system, or that do different things on
 119    your system and must be used only through an encapsulation
 120    (Which you should place, by convention, in sysdep.c).  */
 121 \f
 122 /* On POSIX systems the system calls are interruptible by signals
 123  that the user program has elected to catch.  Thus the system call
 124  must be retried in these cases.  To handle this without massive
 125  changes in the source code, we remap the standard system call names
 126  to names for our own functions in sysdep.c that do the system call
 127  with retries. */
 128
 129 #define read sys_read
 130 #define write sys_write
 131 #define open sys_open
 132 #define close sys_close
 133
 134 #define INTERRUPTIBLE_OPEN
 135 #define INTERRUPTIBLE_CLOSE
 136 #define INTERRUPTIBLE_IO
 137
 138 /* If you mount the proc file system somewhere other than /proc
 139    you will have to uncomment the following and make the proper
 140    changes */
 141
 142 /* #define LINUX_LDAV_FILE "/proc/loadavg" */
 143
 144 /* This is needed for disknew.c:update_frame */
 145
 146 #ifdef emacs
 147 #include <stdio.h>  /* Get the definition of _IO_STDIO_H.  */
 148 #if defined(_IO_STDIO_H) || defined(_STDIO_USES_IOSTREAM)
 149 /* new C libio names */
 150 #define GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE) \
 151   ((FILE)->_IO_write_ptr - (FILE)->_IO_write_base)
 152 #else /* !_IO_STDIO_H */
 153 /* old C++ iostream names */
 154 #define GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE) \
 155   ((FILE)->_pptr - (FILE)->_pbase)
 156 #endif /* !_IO_STDIO_H */
 157 #endif /* emacs */
 158
 159 /* Ask GCC where to find libgcc.a.  */
 160 #define LIB_GCC `$(CC) $(C_SWITCH_X_SITE) -print-libgcc-file-name`
 161
 162 #ifndef __ELF__
 163 /* Linux has crt0.o in a non-standard place */
 164 #define START_FILES pre-crt0.o /usr/lib/crt0.o
 165 #else
 166 #define START_FILES pre-crt0.o /usr/lib/crt1.o /usr/lib/crti.o
 167 #endif
 168
 169 /* As of version 1.1.51, Linux does not actually implement SIGIO.  */
 170 /* Here we assume that signal.h is already included.  */
 171 #ifdef emacs
 172 #undef SIGIO
 173 /* Some versions of Linux define SIGURG and SIGPOLL as aliases for SIGIO.
 174    This prevents lossage in process.c.  */
 175 #undef SIGURG
 176 #undef SIGPOLL
 177 #endif
 178
 179 /* This is needed for sysdep.c */
 180
 181 #define NO_SIOCTL_H           /* don't have sioctl.h */
 182
 183 #define HAVE_VFORK
 184 #define HAVE_SYS_SIGLIST
 185 #define HAVE_GETWD            /* cure conflict with getcwd? */
 186
 187 #define SYSV_SYSTEM_DIR       /* use dirent.h */
 188
 189 #define POSIX                 /* affects getpagesize.h and systty.h */
 190 #define POSIX_SIGNALS
 191
 192 /* Best not to include -lg, unless it is last on the command line */
 193 #define LIBS_DEBUG
 194 #ifndef __ELF__
 195 #define LIB_STANDARD -lc /* avoid -lPW */
 196 #else
 197 #undef LIB_GCC
 198 #define LIB_GCC
 199 #define LIB_STANDARD -lgcc -lc -lgcc /usr/lib/crtn.o
 200 #endif
 201
 202 /* Don't use -g in test compiles in configure.
 203    This is so we will use the same shared libs for that linking
 204    that are used when linking temacs.  */
 205 #ifdef THIS_IS_CONFIGURE
 206 #define C_DEBUG_SWITCH
 207 #endif
 208
 209 /* Let's try this out, just in case.
 210    Nah.  Rik Faith <faith@cs.unc.edu> says it doesn't work well.  */
 211 /* #define SIGNALS_VIA_CHARACTERS */
 212
 213 /* Rob Malouf <malouf@csli.stanford.edu> says:
 214    SYSV IPC is standard a standard part of Linux since version 0.99pl10,
 215    and is a very common addition to previous versions.  */
 216
 217 #ifdef TERM
 218 #define LIBS_SYSTEM -lclient
 219 #define C_SWITCH_SYSTEM -D_BSD_SOURCE -I/usr/src/term
 220 #else
 221 /* alane@wozzle.linet.org says that -lipc is not a separate library,
 222    since libc-4.4.1.  So -lipc was deleted.  */
 223 #define LIBS_SYSTEM
 224 #define C_SWITCH_SYSTEM -D_BSD_SOURCE
 225 #endif
 226
 227 /* Paul Abrahams <abrahams@equinox.shaysnet.com> says this is needed.  */
 228 #define LIB_MOTIF -lXm -lXpm
 229
 230 #define HAVE_SYSVIPC
 231
 232 #ifdef __ELF__
 233 #define UNEXEC unexelf.o
 234 #define UNEXEC_USE_MAP_PRIVATE
 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