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[emacs.git] / src / s / gnu-linux.h
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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.
4 This file is part of GNU Emacs.
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.
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.
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. */
21 /* This file was put together by Michael K. Johnson and Rik Faith. */
25 * Define symbols to identify the version of Unix this is.
26 * Define all the symbols that apply correctly.
29 /* #define UNIPLUS */
30 /* #define USG5 */
31 #define USG
32 /* #define BSD_SYSTEM */
33 #define LINUX
34 #define GNU_LINUX
36 /* SYSTEM_TYPE should indicate the kind of system you are using.
37 It sets the Lisp variable system-type. */
39 #define SYSTEM_TYPE "gnu/linux" /* All the best software is free. */
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>
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 */
58 #if defined HAVE_GRANTPT
59 #define UNIX98_PTYS
61 /* Run only once. We need a `for'-loop because the code uses
62 `continue'. */
64 #define PTY_ITERATION for (i = 0; i < 1; i++)
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 */
73 /* Note that grantpt and unlockpt may fork. We must block SIGCHLD to
74 prevent sigchld_handler from intercepting the child's death. */
76 #define PTY_TTY_NAME_SPRINTF \
77 { \
78 char *ptyname; \
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)); \
93 #else /* not HAVE_GRANTPT */
95 /* Letter to use in finding device name of first pty,
96 if system supports pty's. 'p' means it is /dev/ptyp0 */
98 #define FIRST_PTY_LETTER 'p'
100 #endif /* not HAVE_GRANDPT */
102 /* Define HAVE_TERMIOS if the system provides POSIX-style
103 functions and macros for terminal control. */
105 #define HAVE_TERMIOS
107 /* Define HAVE_PTYS if the system supports pty devices. */
109 #define HAVE_PTYS
111 #define HAVE_SOCKETS
113 /* Define this symbol if your system has the functions bcopy, etc. */
115 #define BSTRING
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. */
123 #define subprocesses
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. */
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 /* Debian contains a patch which says: ``On Debian/GNU/Linux systems,
134 configure gets the right answers, and that means *NOT* using flock.
135 Using flock is guaranteed to be the wrong thing. See Debian Policy
136 for details.'' and then uses `#ifdef DEBIAN'. Unfortunately the
137 Debian maintainer hasn't provided a clean fix for Emacs.
138 movemail.c will use `maillock' when MAILDIR, HAVE_LIBMAIL and
139 HAVE_MAILLOCK_H are defined, so the following appears to be the
140 correct logic. -- fx */
142 #if !(defined (HAVE_LIBMAIL) && defined (HAVE_MAILLOCK_H))
143 #define MAIL_USE_FLOCK
144 #endif
146 /* Define CLASH_DETECTION if you want lock files to be written
147 so that Emacs can tell instantly when you try to modify
148 a file that someone else has modified in his Emacs. */
150 #define CLASH_DETECTION
152 /* Here, on a separate page, add any special hacks needed
153 to make Emacs work on this system. For example,
154 you might define certain system call names that don't
155 exist on your system, or that do different things on
156 your system and must be used only through an encapsulation
157 (Which you should place, by convention, in sysdep.c). */
159 /* If you mount the proc file system somewhere other than /proc
160 you will have to uncomment the following and make the proper
161 changes */
163 /* #define LINUX_LDAV_FILE "/proc/loadavg" */
165 /* This is needed for dispnew.c:update_frame */
167 #ifdef emacs
168 #include <stdio.h> /* Get the definition of _IO_STDIO_H. */
169 #if defined(_IO_STDIO_H) || defined(_STDIO_USES_IOSTREAM)
170 /* new C libio names */
171 #define GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE) \
172 ((FILE)->_IO_write_ptr - (FILE)->_IO_write_base)
173 #else /* !_IO_STDIO_H */
174 /* old C++ iostream names */
175 #define GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE) \
176 ((FILE)->_pptr - (FILE)->_pbase)
177 #endif /* !_IO_STDIO_H */
178 #endif /* emacs */
180 /* Ask GCC where to find libgcc.a. */
181 #define LIB_GCC `$(CC) $(C_SWITCH_X_SITE) -print-libgcc-file-name`
183 #ifndef __ELF__
184 /* GNU/Linux usually has crt0.o in a non-standard place */
185 #define START_FILES pre-crt0.o /usr/lib/crt0.o
186 #else
187 #define START_FILES pre-crt0.o /usr/lib/crt1.o /usr/lib/crti.o
188 #endif
190 #ifdef __ELF__
191 /* Here is how to find X Windows. LD_SWITCH_X_SITE_AUX gives an -R option
192 says where to find X windows at run time. */
194 #ifdef __mips__
195 #define LD_SWITCH_SYSTEM -G 0 LD_SWITCH_X_SITE_AUX
196 #else
197 #define LD_SWITCH_SYSTEM LD_SWITCH_X_SITE_AUX
198 #endif /* __mips__ */
200 /* Link temacs with -z nocombreloc so that unexec works right, whether or
201 not -z combreloc is the default. GNU ld ignores unknown -z KEYWORD
202 switches, so this also works with older versions that don't implement
203 -z combreloc. */
204 #define LD_SWITCH_SYSTEM_TEMACS -z nocombreloc
205 #endif /* __ELF__ */
207 /* As of version 1.1.51, Linux did not actually implement SIGIO.
208 But it works in newer versions. */
209 #ifdef emacs
210 #ifdef LINUX_SIGIO_DOES_WORK
211 #define INTERRUPT_INPUT
212 #else
213 #define BROKEN_SIGIO
214 /* Some versions of Linux define SIGURG and SIGPOLL as aliases for SIGIO.
215 This prevents lossage in process.c. */
216 #define BROKEN_SIGURG
217 #define BROKEN_SIGPOLL
218 #endif
219 #endif
221 /* This is needed for sysdep.c */
223 #define NO_SIOCTL_H /* don't have sioctl.h */
225 #define HAVE_WAIT_HEADER
227 #define SYSV_SYSTEM_DIR /* use dirent.h */
229 #define POSIX /* affects getpagesize.h and systty.h */
230 #define POSIX_SIGNALS
232 /* Best not to include -lg, unless it is last on the command line */
233 #define LIBS_DEBUG
234 #ifndef __ELF__
235 #define LIB_STANDARD -lc /* avoid -lPW */
236 #else
237 #undef LIB_GCC
238 #define LIB_GCC
239 #define LIB_STANDARD -lgcc -lc -lgcc /usr/lib/crtn.o
240 #endif
242 /* Don't use -g in test compiles in configure.
243 This is so we will use the same shared libs for that linking
244 that are used when linking temacs. */
245 #ifdef THIS_IS_CONFIGURE
246 #define C_DEBUG_SWITCH
247 #endif
249 /* Let's try this out, just in case.
250 Nah. Rik Faith <faith@cs.unc.edu> says it doesn't work well. */
251 /* #define SIGNALS_VIA_CHARACTERS */
253 /* Rob Malouf <malouf@csli.stanford.edu> says:
254 SYSV IPC is standard a standard part of Linux since version 0.99pl10,
255 and is a very common addition to previous versions. */
257 #ifdef TERM
258 #define LIBS_SYSTEM -lclient
259 #define C_SWITCH_SYSTEM -D_BSD_SOURCE -I/usr/src/term
260 #else
261 /* alane@wozzle.linet.org says that -lipc is not a separate library,
262 since libc-4.4.1. So -lipc was deleted. */
263 #define LIBS_SYSTEM
264 /* _BSD_SOURCE is redundant, at least in glibc2, since we define
265 _GNU_SOURCE. Left in in case it's relevant to libc5 systems and
266 anyone's still using Emacs on those. --fx 2002-12-14 */
267 #define C_SWITCH_SYSTEM -D_BSD_SOURCE
268 #endif
270 /* Paul Abrahams <abrahams@equinox.shaysnet.com> says this is needed. */
271 #define LIB_MOTIF -lXm -lXpm
273 #ifdef HAVE_LIBNCURSES
274 #define TERMINFO
275 #define LIBS_TERMCAP -lncurses
276 #endif
278 #define HAVE_SYSVIPC
280 #ifdef __ELF__
281 #define UNEXEC unexelf.o
282 #ifndef LINUX_MAP_SHARED_DOES_WORK
283 #define UNEXEC_USE_MAP_PRIVATE
284 #endif
285 #endif
287 #ifdef LINUX_QMAGIC
289 #define HAVE_TEXT_START
290 #define UNEXEC unexsunos4.o
291 #define N_PAGSIZ(x) PAGE_SIZE
293 #else /* not LINUX_QMAGIC */
295 #define A_TEXT_OFFSET(hdr) (N_MAGIC(hdr) == QMAGIC ? sizeof (struct exec) : 0)
296 #define A_TEXT_SEEK(hdr) (N_TXTOFF(hdr) + A_TEXT_OFFSET(hdr))
297 #define ADJUST_EXEC_HEADER \
298 unexec_text_start = N_TXTADDR(ohdr) + A_TEXT_OFFSET(ohdr)
300 #endif /* not LINUX_QMAGIC */
302 #if 0
303 /* In 19.23 and 19.24, configure sometimes fails to define these.
304 It has to do with the fact that configure uses CFLAGS when linking
305 while Makefile.in.in (erroneously) fails to do so when linking temacs. */
306 #ifndef HAVE_GETTIMEOFDAY
307 #define HAVE_GETTIMEOFDAY
308 #endif
309 #ifndef HAVE_MKDIR
310 #define HAVE_MKDIR
311 #endif
312 #ifndef HAVE_RMDIR
313 #define HAVE_RMDIR
314 #endif
315 #ifndef HAVE_XSCREENNUMBEROFSCREEN
316 #define HAVE_XSCREENNUMBEROFSCREEN
317 #endif
318 #endif /* 0 */
320 /* This is to work around mysterious gcc failures in some system versions.
321 It is unlikely that Emacs changes will work around this problem;
322 therefore, this should remain permanently. */
323 #ifndef HAVE_XRMSETDATABASE
324 #define HAVE_XRMSETDATABASE
325 #endif
327 /* The regex.o routines are a part of the GNU C-library used with Linux. */
328 /* However, sometimes they disagree with the src/regex.h that comes with Emacs,
329 and that can make trouble in etags.c because it gets the regex.h from Emacs
330 and the function definitions in libc. So turn this off. */
331 /* #define REGEXP_IN_LIBC */
333 /* Use BSD process groups, but use setpgid() instead of setpgrp() to
334 actually set a process group. */
336 #define BSD_PGRPS
338 #define NARROWPROTO 1
340 /* Use mmap directly for allocating larger buffers. */
341 #ifdef DOUG_LEA_MALLOC
342 #undef REL_ALLOC
343 #endif
345 /* Tell that garbage collector that setjmp is known to save all
346 registers relevant for conservative garbage collection in the
347 jmp_buf. */
348 /* Not all the architectures are tested, but there are Debian packages
349 for SCM and/or Guile on them, so the technique must work. See also
350 comments in alloc.c concerning setjmp and gcc. Fixme: it's
351 probably safe to make this conditional just on GCC, except for ia64
352 register window-flushing. */
353 /* Don't use #cpu here since in newest development versions of GCC,
354 we must call cpp with -traditional, and that disables #cpu. */
356 #if defined __i386__ || defined __sparc__ || defined __mc68000__ \
357 || defined __alpha__ || defined __mips__ || defined __s390__ \
358 || defined __arm__ || defined __powerpc__
359 #define GC_SETJMP_WORKS 1
360 #define GC_MARK_STACK GC_MAKE_GCPROS_NOOPS
361 #ifdef __mc68000__
362 #define GC_LISP_OBJECT_ALIGNMENT 2
363 #endif
364 #endif
366 /* arch-tag: 6244ea2a-abd0-44ec-abec-ff3dcc9afea9
367 (do not change this comment) */