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, 2002 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 #define GNU_LINUX
  35
  36 /* SYSTEM_TYPE should indicate the kind of system you are using.
  37  It sets the Lisp variable system-type.  */
  38
  39 #define SYSTEM_TYPE "gnu/linux"         /* All the best software is free. */
  40
  41 /* Check the version number of Linux--if it is at least 1.2.0,
  42    it is safe to use SIGIO.  */
  43 #ifndef NOT_C_CODE
  44 #ifdef emacs
  45 #ifdef HAVE_LINUX_VERSION_H
  46 #include <linux/version.h>
  47
  48 #if LINUX_VERSION_CODE > 0x10200
  49 #define LINUX_SIGIO_DOES_WORK
  50 #endif /* LINUX_VERSION_CODE > 0x10200 */
  51 #if LINUX_VERSION_CODE >= 0x20000
  52 #define LINUX_MAP_SHARED_DOES_WORK
  53 #endif /* LINUX_VERSION_CODE >= 0x20000 */
  54 #endif /* HAVE_LINUX_VERSION_H */
  55 #endif /* emacs */
  56 #endif /* NOT_C_CODE */
  57
  58 #if defined HAVE_GRANTPT
  59 #define UNIX98_PTYS
  60
  61 /* Run only once.  We need a `for'-loop because the code uses
  62    `continue'.  */
  63
  64 #define PTY_ITERATION   for (i = 0; i < 1; i++)
  65
  66 #ifdef HAVE_GETPT
  67 #define PTY_NAME_SPRINTF
  68 #define PTY_OPEN fd = getpt ()
  69 #else /* not HAVE_GETPT */
  70 #define PTY_NAME_SPRINTF strcpy (pty_name, "/dev/ptmx");
  71 #endif /* not HAVE_GETPT */
  72
  73 /* Note that grantpt and unlockpt may fork.  We must block SIGCHLD to
  74    prevent sigchld_handler from intercepting the child's death.  */
  75
  76 #define PTY_TTY_NAME_SPRINTF                            \
  77   {                                                     \
  78     char *ptyname;                                      \
  79                                                         \
  80     sigblock (sigmask (SIGCHLD));                       \
  81     if (grantpt (fd) == -1 || unlockpt (fd) == -1       \
  82         || !(ptyname = ptsname(fd)))                    \
  83       {                                                 \
  84         sigunblock (sigmask (SIGCHLD));                 \
  85         close (fd);                                     \
  86         return -1;                                      \
  87       }                                                 \
  88     strncpy (pty_name, ptyname, sizeof (pty_name));     \
  89     pty_name[sizeof (pty_name) - 1] = 0;                \
  90     sigunblock (sigmask (SIGCHLD));                     \
  91   }
  92
  93 #else /* not HAVE_GRANTPT */
  94
  95 /* Letter to use in finding device name of first pty,
  96    if system supports pty's.  'p' means it is /dev/ptyp0  */
  97
  98 #define FIRST_PTY_LETTER 'p'
  99
 100 #endif  /* not HAVE_GRANDPT */
 101
 102 /*  Define HAVE_TERMIOS if the system provides POSIX-style
 103     functions and macros for terminal control.  */
 104
 105 #define HAVE_TERMIOS
 106
 107 /* Define HAVE_PTYS if the system supports pty devices. */
 108
 109 #define HAVE_PTYS
 110
 111 #define HAVE_SOCKETS
 112
 113 /* Define this symbol if your system has the functions bcopy, etc. */
 114
 115 #define BSTRING
 116
 117 /* subprocesses should be defined if you want to
 118    have code for asynchronous subprocesses
 119    (as used in M-x compile and M-x shell).
 120    This is generally OS dependent, and not supported
 121    under most USG systems. */
 122
 123 #define subprocesses
 124
 125 /* define MAIL_USE_FLOCK if the mailer uses flock
 126    to interlock access to /usr/spool/mail/$USER.
 127    The alternative is that a lock file named
 128    /usr/spool/mail/$USER.lock.  */
 129
 130 /* On GNU/Linux systems, both methods are used by various mail
 131    programs.  I assume that most people are using newer mailers that
 132    have heard of flock.  Change this if you need to. */
 133
 134 #define MAIL_USE_FLOCK
 135
 136 /* Define CLASH_DETECTION if you want lock files to be written
 137    so that Emacs can tell instantly when you try to modify
 138    a file that someone else has modified in his Emacs.  */
 139
 140 #define CLASH_DETECTION
 141
 142 /* Here, on a separate page, add any special hacks needed
 143    to make Emacs work on this system.  For example,
 144    you might define certain system call names that don't
 145    exist on your system, or that do different things on
 146    your system and must be used only through an encapsulation
 147    (Which you should place, by convention, in sysdep.c).  */
 148 \f
 149 /* If you mount the proc file system somewhere other than /proc
 150    you will have to uncomment the following and make the proper
 151    changes */
 152
 153 /* #define LINUX_LDAV_FILE "/proc/loadavg" */
 154
 155 /* This is needed for dispnew.c:update_frame */
 156
 157 #ifdef emacs
 158 #include <stdio.h>  /* Get the definition of _IO_STDIO_H.  */
 159 #if defined(_IO_STDIO_H) || defined(_STDIO_USES_IOSTREAM)
 160 /* new C libio names */
 161 #define GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE) \
 162   ((FILE)->_IO_write_ptr - (FILE)->_IO_write_base)
 163 #else /* !_IO_STDIO_H */
 164 /* old C++ iostream names */
 165 #define GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE) \
 166   ((FILE)->_pptr - (FILE)->_pbase)
 167 #endif /* !_IO_STDIO_H */
 168 #endif /* emacs */
 169
 170 /* Ask GCC where to find libgcc.a.  */
 171 #define LIB_GCC `$(CC) $(C_SWITCH_X_SITE) -print-libgcc-file-name`
 172
 173 #ifndef __ELF__
 174 /* GNU/Linux usually has crt0.o in a non-standard place */
 175 #define START_FILES pre-crt0.o /usr/lib/crt0.o
 176 #else
 177 #define START_FILES pre-crt0.o /usr/lib/crt1.o /usr/lib/crti.o
 178 #endif
 179
 180 #ifdef __ELF__
 181 /* Here is how to find X Windows.  LD_SWITCH_X_SITE_AUX gives an -R option
 182    says where to find X windows at run time.  */
 183
 184 #ifdef __mips__
 185 #define LD_SWITCH_SYSTEM -G 0 LD_SWITCH_X_SITE_AUX
 186 #else
 187 #define LD_SWITCH_SYSTEM LD_SWITCH_X_SITE_AUX
 188 #endif /* __mips__ */
 189
 190 /* Link temacs with -z nocombreloc so that unexec works right, whether or
 191    not -z combreloc is the default.  GNU ld ignores unknown -z KEYWORD
 192    switches, so this also works with older versions that don't implement
 193    -z combreloc.  */
 194 #define LD_SWITCH_SYSTEM_TEMACS -z nocombreloc
 195 #endif /* __ELF__ */
 196
 197 /* As of version 1.1.51, Linux did not actually implement SIGIO.
 198    But it works in newer versions.  */
 199 #ifdef emacs
 200 #ifdef LINUX_SIGIO_DOES_WORK
 201 #define INTERRUPT_INPUT
 202 #else
 203 #define BROKEN_SIGIO
 204 /* Some versions of Linux define SIGURG and SIGPOLL as aliases for SIGIO.
 205    This prevents lossage in process.c.  */
 206 #define BROKEN_SIGURG
 207 #define BROKEN_SIGPOLL
 208 #endif
 209 #endif
 210
 211 /* This is needed for sysdep.c */
 212
 213 #define NO_SIOCTL_H           /* don't have sioctl.h */
 214
 215 #define HAVE_WAIT_HEADER
 216
 217 #define SYSV_SYSTEM_DIR       /* use dirent.h */
 218
 219 #define POSIX                 /* affects getpagesize.h and systty.h */
 220 #define POSIX_SIGNALS
 221
 222 /* Best not to include -lg, unless it is last on the command line */
 223 #define LIBS_DEBUG
 224 #ifndef __ELF__
 225 #define LIB_STANDARD -lc /* avoid -lPW */
 226 #else
 227 #undef LIB_GCC
 228 #define LIB_GCC
 229 #define LIB_STANDARD -lgcc -lc -lgcc /usr/lib/crtn.o
 230 #endif
 231
 232 /* Don't use -g in test compiles in configure.
 233    This is so we will use the same shared libs for that linking
 234    that are used when linking temacs.  */
 235 #ifdef THIS_IS_CONFIGURE
 236 #define C_DEBUG_SWITCH
 237 #endif
 238
 239 /* Let's try this out, just in case.
 240    Nah.  Rik Faith <faith@cs.unc.edu> says it doesn't work well.  */
 241 /* #define SIGNALS_VIA_CHARACTERS */
 242
 243 /* Rob Malouf <malouf@csli.stanford.edu> says:
 244    SYSV IPC is standard a standard part of Linux since version 0.99pl10,
 245    and is a very common addition to previous versions.  */
 246
 247 #ifdef TERM
 248 #define LIBS_SYSTEM -lclient
 249 #define C_SWITCH_SYSTEM -D_BSD_SOURCE -I/usr/src/term
 250 #else
 251 /* alane@wozzle.linet.org says that -lipc is not a separate library,
 252    since libc-4.4.1.  So -lipc was deleted.  */
 253 #define LIBS_SYSTEM
 254 #define C_SWITCH_SYSTEM -D_BSD_SOURCE
 255 #endif
 256
 257 /* Paul Abrahams <abrahams@equinox.shaysnet.com> says this is needed.  */
 258 #define LIB_MOTIF -lXm -lXpm
 259
 260 #ifdef HAVE_LIBNCURSES
 261 #define TERMINFO
 262 #define LIBS_TERMCAP -lncurses
 263 #endif
 264
 265 #define HAVE_SYSVIPC
 266
 267 #ifdef __ELF__
 268 #define UNEXEC unexelf.o
 269 #ifndef LINUX_MAP_SHARED_DOES_WORK
 270 #define UNEXEC_USE_MAP_PRIVATE
 271 #endif
 272 #endif
 273
 274 #ifdef LINUX_QMAGIC
 275
 276 #define HAVE_TEXT_START
 277 #define UNEXEC unexsunos4.o
 278 #define N_PAGSIZ(x) PAGE_SIZE
 279
 280 #else /* not LINUX_QMAGIC */
 281
 282 #define A_TEXT_OFFSET(hdr) (N_MAGIC(hdr) == QMAGIC ? sizeof (struct exec) : 0)
 283 #define A_TEXT_SEEK(hdr) (N_TXTOFF(hdr) + A_TEXT_OFFSET(hdr))
 284 #define ADJUST_EXEC_HEADER \
 285   unexec_text_start = N_TXTADDR(ohdr) + A_TEXT_OFFSET(ohdr)
 286
 287 #endif /* not LINUX_QMAGIC */
 288
 289 #if 0
 290 /* In 19.23 and 19.24, configure sometimes fails to define these.
 291    It has to do with the fact that configure uses CFLAGS when linking
 292    while Makefile.in.in (erroneously) fails to do so when linking temacs.  */
 293 #ifndef HAVE_GETTIMEOFDAY
 294 #define HAVE_GETTIMEOFDAY
 295 #endif
 296 #ifndef HAVE_MKDIR
 297 #define HAVE_MKDIR
 298 #endif
 299 #ifndef HAVE_RMDIR
 300 #define HAVE_RMDIR
 301 #endif
 302 #ifndef HAVE_XSCREENNUMBEROFSCREEN
 303 #define HAVE_XSCREENNUMBEROFSCREEN
 304 #endif
 305 #endif /* 0 */
 306
 307 /* This is to work around mysterious gcc failures in some system versions.
 308    It is unlikely that Emacs changes will work around this problem;
 309    therefore, this should remain permanently.  */
 310 #ifndef HAVE_XRMSETDATABASE
 311 #define HAVE_XRMSETDATABASE
 312 #endif
 313
 314 /* The regex.o routines are a part of the GNU C-library used with Linux.  */
 315 /* However, sometimes they disagree with the src/regex.h that comes with Emacs,
 316    and that can make trouble in etags.c because it gets the regex.h from Emacs
 317    and the function definitions in libc.  So turn this off.  */
 318 /* #define REGEXP_IN_LIBC */
 319
 320 /* Use BSD process groups, but use setpgid() instead of setpgrp() to
 321    actually set a process group. */
 322
 323 #define BSD_PGRPS
 324
 325 #define NARROWPROTO 1
 326
 327 /* Use mmap directly for allocating larger buffers.  */
 328 #ifdef DOUG_LEA_MALLOC
 329 #undef REL_ALLOC
 330 #endif
 331
 332 /* Tell that garbage collector that setjmp is known to save all
 333    registers relevant for conservative garbage collection in the
 334    jmp_buf.  */
 335 /* m68k and alpha aren't tested, but there are Debian packages for SCM
 336    and/or Guile on them, so the technique must work.  */
 337
 338 /* Don't use #cpu here since in newest development versions of GCC,
 339    we must call cpp with -traditional, and that disables #cpu.  */
 340
 341 #if defined __i386__ || defined __sparc__ || defined __mc68000__ || defined __alpha__
 342 #define GC_SETJMP_WORKS 1
 343 #define GC_MARK_STACK GC_MAKE_GCPROS_NOOPS
 344 #ifdef __mc68000__
 345 #define GC_LISP_OBJECT_ALIGNMENT 2
 346 #endif
 347 #endif