1 /* Copyright (C) 1991-2003, 2004 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
20 * ISO C99 Standard: 7.14 Signal handling <signal.h>
25 #if !defined __need_sig_atomic_t && !defined __need_sigset_t
33 #include <bits/sigset.h> /* __sigset_t, __sig_atomic_t. */
35 /* An integral type that can be modified atomically, without the
36 possibility of a signal arriving in the middle of the operation. */
37 #if defined __need_sig_atomic_t || defined _SIGNAL_H
38 # ifndef __sig_atomic_t_defined
39 # define __sig_atomic_t_defined
41 typedef __sig_atomic_t sig_atomic_t;
44 # undef __need_sig_atomic_t
47 #if defined __need_sigset_t || (defined _SIGNAL_H && defined __USE_POSIX)
48 # ifndef __sigset_t_defined
49 # define __sigset_t_defined
50 typedef __sigset_t sigset_t;
52 # undef __need_sigset_t
57 #include <bits/types.h>
58 #include <bits/signum.h>
59 //TODO vda: pull out of bits/signum.h the following,
60 //which is the same for all arches:
61 //#define SIG_ERR ((__sighandler_t) -1) /* Error return. */
62 //#define SIG_DFL ((__sighandler_t) 0) /* Default action. */
63 //#define SIG_IGN ((__sighandler_t) 1) /* Ignore signal. */
65 //# define SIG_HOLD ((__sighandler_t) 2) /* Add signal to hold mask. */
67 //#define SIGRTMIN (__libc_current_sigrtmin())
68 //#define SIGRTMAX (__libc_current_sigrtmax())
69 //#define __SIGRTMIN -- dont pull, it's arch specific
70 //#define __SIGRTMAX (_NSIG - 1)
72 #if defined __USE_XOPEN || defined __USE_XOPEN2K
73 # ifndef __pid_t_defined
74 typedef __pid_t pid_t;
75 # define __pid_t_defined
77 # ifndef __uid_t_defined
78 typedef __uid_t uid_t;
79 # define __uid_t_defined
84 /* Type of a signal handler. */
85 typedef void (*__sighandler_t) (int);
86 #if defined __UCLIBC_HAS_OBSOLETE_SYSV_SIGNAL__
87 /* The X/Open definition of `signal' specifies the SVID semantic. Use
88 the additional function `sysv_signal' when X/Open compatibility is
90 extern __sighandler_t __sysv_signal (int __sig, __sighandler_t __handler)
93 extern __sighandler_t sysv_signal (int __sig, __sighandler_t __handler)
96 #endif /* __UCLIBC_HAS_OBSOLETE_SYSV_SIGNAL__ */
98 /* Set the handler for the signal SIG to HANDLER, returning the old
99 handler, or SIG_ERR on error.
100 By default `signal' has the BSD semantic. */
101 __BEGIN_NAMESPACE_STD
102 #if defined __USE_BSD || !defined __UCLIBC_HAS_OBSOLETE_SYSV_SIGNAL__
103 extern __sighandler_t signal (int __sig, __sighandler_t __handler)
105 libc_hidden_proto(signal)
107 /* Make sure the used `signal' implementation is the SVID version. */
108 # ifdef __REDIRECT_NTH
109 extern __sighandler_t __REDIRECT_NTH (signal,
110 (int __sig, __sighandler_t __handler),
113 # define signal __sysv_signal
119 /* The X/Open definition of `signal' conflicts with the BSD version.
120 So they defined another function `bsd_signal'. */
121 extern __sighandler_t bsd_signal (int __sig, __sighandler_t __handler)
125 /* Send signal SIG to process number PID. If PID is zero,
126 send SIG to all processes in the current process's process group.
127 If PID is < -1, send SIG to all processes in process group - PID. */
129 extern int kill (__pid_t __pid, int __sig) __THROW;
130 libc_hidden_proto(kill)
133 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
134 /* Send SIG to all processes in process group PGRP.
135 If PGRP is zero, send SIG to all processes in
136 the current process's process group. */
137 extern int killpg (__pid_t __pgrp, int __sig) __THROW;
140 __BEGIN_NAMESPACE_STD
141 /* Raise signal SIG, i.e., send SIG to yourself. */
142 extern int raise (int __sig) __THROW;
143 libc_hidden_proto(raise)
147 /* SVID names for the same things. */
148 extern __sighandler_t ssignal (int __sig, __sighandler_t __handler)
150 extern int gsignal (int __sig) __THROW;
151 #endif /* Use SVID. */
154 /* Print a message describing the meaning of the given signal number. */
155 extern void psignal (int __sig, __const char *__s);
156 #endif /* Use misc. */
159 /* The `sigpause' function has two different interfaces. The original
160 BSD definition defines the argument as a mask of the signal, while
161 the more modern interface in X/Open defines it as the signal
162 number. We go with the BSD version unless the user explicitly
163 selects the X/Open version.
165 This function is a cancellation point and therefore not marked with
167 extern int __sigpause (int __sig_or_mask, int __is_sig);
168 libc_hidden_proto(__sigpause)
171 /* Set the mask of blocked signals to MASK,
172 wait for a signal to arrive, and then restore the mask. */
173 extern int sigpause (int __mask) __THROW __attribute_deprecated__;
174 libc_hidden_proto(sigpause)
175 # define sigpause(mask) __sigpause ((mask), 0)
178 /* Remove a signal from the signal mask and suspend the process. */
179 # define sigpause(sig) __sigpause ((sig), 1)
185 /* None of the following functions should be used anymore. They are here
186 only for compatibility. A single word (`int') is not guaranteed to be
187 enough to hold a complete signal mask and therefore these functions
188 simply do not work in many situations. Use `sigprocmask' instead. */
190 /* Compute mask for signal SIG. */
191 # define sigmask(sig) __sigmask(sig)
193 /* Block signals in MASK, returning the old mask. */
194 extern int sigblock (int __mask) __THROW;
195 /* collides with libc_hidden_proto: __attribute_deprecated__; */
196 libc_hidden_proto(sigblock)
198 /* Set the mask of blocked signals to MASK, returning the old mask. */
199 extern int sigsetmask (int __mask) __THROW;
200 /* collides with libc_hidden_proto: __attribute_deprecated__; */
201 libc_hidden_proto(sigsetmask)
203 /* Return currently selected signal mask. */
204 extern int siggetmask (void) __THROW __attribute_deprecated__;
205 #endif /* Use BSD. */
208 /* Biggest signal number + 1 (including real-time signals). */
214 typedef __sighandler_t sighandler_t;
217 /* 4.4 BSD uses the name `sig_t' for this. */
219 typedef __sighandler_t sig_t;
224 # ifdef __USE_POSIX199309
225 /* We need `struct timespec' later on. */
226 # define __need_timespec
229 /* Get the `siginfo_t' type plus the needed symbols. */
230 # include <bits/siginfo.h>
233 /* Clear all signals from SET. */
234 extern int sigemptyset (sigset_t *__set) __THROW __nonnull ((1));
235 libc_hidden_proto(sigemptyset)
237 /* Set all signals in SET. */
238 extern int sigfillset (sigset_t *__set) __THROW __nonnull ((1));
239 libc_hidden_proto(sigfillset)
241 /* Add SIGNO to SET. */
242 extern int sigaddset (sigset_t *__set, int __signo) __THROW __nonnull ((1));
243 libc_hidden_proto(sigaddset)
245 /* Remove SIGNO from SET. */
246 extern int sigdelset (sigset_t *__set, int __signo) __THROW __nonnull ((1));
247 libc_hidden_proto(sigdelset)
249 /* Return 1 if SIGNO is in SET, 0 if not. */
250 extern int sigismember (__const sigset_t *__set, int __signo)
251 __THROW __nonnull ((1));
254 /* Return non-empty value is SET is not empty. */
255 extern int sigisemptyset (__const sigset_t *__set) __THROW __nonnull ((1));
257 /* Build new signal set by combining the two inputs set using logical AND. */
258 extern int sigandset (sigset_t *__set, __const sigset_t *__left,
259 __const sigset_t *__right) __THROW __nonnull ((1, 2, 3));
261 /* Build new signal set by combining the two inputs set using logical OR. */
262 extern int sigorset (sigset_t *__set, __const sigset_t *__left,
263 __const sigset_t *__right) __THROW __nonnull ((1, 2, 3));
266 /* Get the system-specific definitions of `struct sigaction'
267 and the `SA_*' and `SIG_*'. constants. */
268 # include <bits/sigaction.h>
270 /* Get and/or change the set of blocked signals. */
271 extern int sigprocmask (int __how, __const sigset_t *__restrict __set,
272 sigset_t *__restrict __oset) __THROW;
273 libc_hidden_proto(sigprocmask)
275 /* Change the set of blocked signals to SET,
276 wait until a signal arrives, and restore the set of blocked signals.
278 This function is a cancellation point and therefore not marked with
280 extern int sigsuspend (__const sigset_t *__set) __nonnull ((1));
281 libc_hidden_proto(sigsuspend)
283 /* Get and/or set the action for signal SIG. */
284 extern int sigaction (int __sig, __const struct sigaction *__restrict __act,
285 struct sigaction *__restrict __oact) __THROW;
286 libc_hidden_proto(sigaction)
288 /* Put in SET all signals that are blocked and waiting to be delivered. */
289 extern int sigpending (sigset_t *__set) __THROW __nonnull ((1));
292 /* Select any of pending signals from SET or wait for any to arrive.
294 This function is a cancellation point and therefore not marked with
296 extern int sigwait (__const sigset_t *__restrict __set, int *__restrict __sig)
298 libc_hidden_proto(sigwait)
300 # if defined __USE_POSIX199309 && defined __UCLIBC_HAS_REALTIME__
301 /* Select any of pending signals from SET and place information in INFO.
303 This function is a cancellation point and therefore not marked with
305 extern int sigwaitinfo (__const sigset_t *__restrict __set,
306 siginfo_t *__restrict __info) __nonnull ((1));
307 libc_hidden_proto(sigwaitinfo)
309 /* Select any of pending signals from SET and place information in INFO.
310 Wait the time specified by TIMEOUT if no signal is pending.
312 This function is a cancellation point and therefore not marked with
314 extern int sigtimedwait (__const sigset_t *__restrict __set,
315 siginfo_t *__restrict __info,
316 __const struct timespec *__restrict __timeout)
318 libc_hidden_proto(sigtimedwait)
320 /* Send signal SIG to the process PID. Associate data in VAL with the
322 extern int sigqueue (__pid_t __pid, int __sig, __const union sigval __val)
324 # endif /* Use POSIX 199306. */
326 #endif /* Use POSIX. */
330 # ifdef __UCLIBC_HAS_SYS_SIGLIST__
331 /* Names of the signals. This variable exists only for compatibility.
332 Use `strsignal' instead (see <string.h>). */
333 # define _sys_siglist sys_siglist
334 extern __const char *__const sys_siglist[_NSIG];
337 /* Structure passed to `sigvec'. */
340 __sighandler_t sv_handler; /* Signal handler. */
341 int sv_mask; /* Mask of signals to be blocked. */
343 int sv_flags; /* Flags (see below). */
344 # define sv_onstack sv_flags /* 4.2 BSD compatibility. */
347 /* Bits in `sv_flags'. */
348 # define SV_ONSTACK (1 << 0)/* Take the signal on the signal stack. */
349 # define SV_INTERRUPT (1 << 1)/* Do not restart system calls. */
350 # define SV_RESETHAND (1 << 2)/* Reset handler to SIG_DFL on receipt. */
353 /* If VEC is non-NULL, set the handler for SIG to the `sv_handler' member
354 of VEC. The signals in `sv_mask' will be blocked while the handler runs.
355 If the SV_RESETHAND bit is set in `sv_flags', the handler for SIG will be
356 reset to SIG_DFL before `sv_handler' is entered. If OVEC is non-NULL,
357 it is filled in with the old information for SIG. */
358 extern int sigvec (int __sig, __const struct sigvec *__vec,
359 struct sigvec *__ovec) __THROW;
362 /* Get machine-dependent `struct sigcontext' and signal subcodes. */
363 # include <bits/sigcontext.h>
365 /* Restore the state saved in SCP. */
366 extern int sigreturn (struct sigcontext *__scp) __THROW;
368 #endif /* use BSD. */
371 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
373 /* If INTERRUPT is nonzero, make signal SIG interrupt system calls
374 (causing them to fail with EINTR); if INTERRUPT is zero, make system
375 calls be restarted after signal SIG. */
376 extern int siginterrupt (int __sig, int __interrupt) __THROW;
378 # include <bits/sigstack.h>
380 /* This will define `ucontext_t' and `mcontext_t'. */
381 # include <ucontext.h>
384 /* Run signals handlers on the stack specified by SS (if not NULL).
385 If OSS is not NULL, it is filled in with the old signal stack status.
386 This interface is obsolete and on many platform not implemented. */
387 extern int sigstack (struct sigstack *__ss, struct sigstack *__oss)
388 __THROW __attribute_deprecated__;
390 /* Alternate signal handler stack interface.
391 This interface should always be preferred over `sigstack'. */
392 extern int sigaltstack (__const struct sigaltstack *__restrict __ss,
393 struct sigaltstack *__restrict __oss) __THROW;
395 #endif /* use BSD or X/Open Unix. */
397 #if defined __USE_XOPEN_EXTENDED && defined __UCLIBC_HAS_OBSOLETE_BSD_SIGNAL__
398 /* Simplified interface for signal management. */
400 /* Add SIG to the calling process' signal mask. */
401 extern int sighold (int __sig) __THROW;
403 /* Remove SIG from the calling process' signal mask. */
404 extern int sigrelse (int __sig) __THROW;
406 /* Set the disposition of SIG to SIG_IGN. */
407 extern int sigignore (int __sig) __THROW;
409 /* Set the disposition of SIG. */
410 extern __sighandler_t sigset (int __sig, __sighandler_t __disp) __THROW;
413 #if defined __UCLIBC_HAS_THREADS__ && (defined __USE_POSIX199506 || defined __USE_UNIX98)
414 /* Some of the functions for handling signals in threaded programs must
416 # include <bits/pthreadtypes.h>
417 # include <bits/sigthread.h>
420 /* The following functions are used internally in the C library and in
421 other code which need deep insights. */
423 /* Return number of available real-time signal with highest priority. */
424 extern int __libc_current_sigrtmin (void) __THROW;
425 /* Return number of available real-time signal with lowest priority. */
426 extern int __libc_current_sigrtmax (void) __THROW;
428 #endif /* signal.h */
432 #endif /* not signal.h */