1 /* Copyright (C) 1991-2003, 2004, 2007, 2009 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>
60 /* Fake signal functions. */
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 /* Biggest signal number + 1 (including real-time signals). */
68 #ifndef _NSIG /* if arch has not defined it in bits/signum.h... */
74 /* Real-time signal range */
75 #define SIGRTMIN (__libc_current_sigrtmin())
76 #define SIGRTMAX (__libc_current_sigrtmax())
77 /* These are the hard limits of the kernel. These values should not be
78 used directly at user level. */
79 #ifndef __SIGRTMIN /* if arch has not defined it in bits/signum.h... */
80 # define __SIGRTMIN 32
82 #define __SIGRTMAX (_NSIG - 1)
85 #if defined __USE_XOPEN || defined __USE_XOPEN2K
86 # ifndef __pid_t_defined
87 typedef __pid_t pid_t;
88 # define __pid_t_defined
92 # ifndef __uid_t_defined
93 typedef __uid_t uid_t;
94 # define __uid_t_defined
98 #if defined __USE_POSIX199309 && defined __UCLIBC_HAS_REALTIME__
99 /* We need `struct timespec' later on. */
100 # define __need_timespec
103 /* Get the `siginfo_t' type plus the needed symbols. */
104 # include <bits/siginfo.h>
108 /* Type of a signal handler. */
109 typedef void (*__sighandler_t) (int);
111 #if defined __UCLIBC_HAS_OBSOLETE_SYSV_SIGNAL__
112 /* The X/Open definition of `signal' specifies the SVID semantic. Use
113 the additional function `sysv_signal' when X/Open compatibility is
115 extern __sighandler_t __sysv_signal (int __sig, __sighandler_t __handler)
118 extern __sighandler_t sysv_signal (int __sig, __sighandler_t __handler)
121 #endif /* __UCLIBC_HAS_OBSOLETE_SYSV_SIGNAL__ */
123 /* Set the handler for the signal SIG to HANDLER, returning the old
124 handler, or SIG_ERR on error.
125 By default `signal' has the BSD semantic. */
126 __BEGIN_NAMESPACE_STD
127 #if defined __USE_BSD || !defined __UCLIBC_HAS_OBSOLETE_SYSV_SIGNAL__
128 extern __sighandler_t signal (int __sig, __sighandler_t __handler)
130 libc_hidden_proto(signal)
132 /* Make sure the used `signal' implementation is the SVID version. */
133 # ifdef __REDIRECT_NTH
134 extern __sighandler_t __REDIRECT_NTH (signal,
135 (int __sig, __sighandler_t __handler),
138 # define signal __sysv_signal
143 #if defined __USE_XOPEN && defined __UCLIBC_SUSV3_LEGACY__
144 /* The X/Open definition of `signal' conflicts with the BSD version.
145 So they defined another function `bsd_signal'. */
146 extern __sighandler_t bsd_signal (int __sig, __sighandler_t __handler)
150 /* Send signal SIG to process number PID. If PID is zero,
151 send SIG to all processes in the current process's process group.
152 If PID is < -1, send SIG to all processes in process group - PID. */
154 extern int kill (__pid_t __pid, int __sig) __THROW;
155 libc_hidden_proto(kill)
158 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
159 /* Send SIG to all processes in process group PGRP.
160 If PGRP is zero, send SIG to all processes in
161 the current process's process group. */
162 extern int killpg (__pid_t __pgrp, int __sig) __THROW;
165 __BEGIN_NAMESPACE_STD
166 /* Raise signal SIG, i.e., send SIG to yourself. */
167 extern int raise (int __sig) __THROW;
168 libc_hidden_proto(raise)
171 #if 0 /*def __USE_SVID*/
172 /* SVID names for the same things. */
173 extern __sighandler_t ssignal (int __sig, __sighandler_t __handler)
175 extern int gsignal (int __sig) __THROW;
176 #endif /* Use SVID. */
178 /* glibc guards the next two wrong with __USE_XOPEN2K */
179 #if defined __USE_MISC || defined __USE_XOPEN2K8
180 /* Print a message describing the meaning of the given signal number. */
181 extern void psignal (int __sig, __const char *__s);
182 #endif /* Use misc or POSIX 2008. */
184 #if 0 /*def __USE_XOPEN2K8*/
185 /* Print a message describing the meaning of the given signal information. */
186 extern void psiginfo (__const siginfo_t *__pinfo, __const char *__s);
187 #endif /* POSIX 2008. */
189 #ifdef __UCLIBC_SUSV4_LEGACY__
190 /* The `sigpause' function has two different interfaces. The original
191 BSD definition defines the argument as a mask of the signal, while
192 the more modern interface in X/Open defines it as the signal
193 number. We go with the BSD version unless the user explicitly
194 selects the X/Open version.
196 This function is a cancellation point and therefore not marked with
198 extern int __sigpause (int __sig_or_mask, int __is_sig);
199 libc_hidden_proto(__sigpause)
202 /* Set the mask of blocked signals to MASK,
203 wait for a signal to arrive, and then restore the mask. */
204 extern int sigpause (int __mask) __THROW __attribute_deprecated__;
205 # define sigpause(mask) __sigpause ((mask), 0)
208 /* Remove a signal from the signal mask and suspend the process. */
209 # define sigpause(sig) __sigpause ((sig), 1)
212 #endif /* __UCLIBC_SUSV4_LEGACY__ */
215 /* None of the following functions should be used anymore. They are here
216 only for compatibility. A single word (`int') is not guaranteed to be
217 enough to hold a complete signal mask and therefore these functions
218 simply do not work in many situations. Use `sigprocmask' instead. */
220 /* Compute mask for signal SIG. */
221 # define sigmask(sig) __sigmask(sig)
223 /* Block signals in MASK, returning the old mask. */
225 extern int sigblock (int __mask) __THROW;
226 /* collides with libc_hidden_proto: __attribute_deprecated__; */
227 libc_hidden_proto(sigblock)
229 extern int sigblock (int __mask) __THROW __attribute_deprecated__;
232 /* Set the mask of blocked signals to MASK, returning the old mask. */
234 extern int sigsetmask (int __mask) __THROW;
235 /* collides with libc_hidden_proto: __attribute_deprecated__; */
236 libc_hidden_proto(sigsetmask)
238 extern int sigsetmask (int __mask) __THROW __attribute_deprecated__;
241 /* Return currently selected signal mask. */
242 extern int siggetmask (void) __THROW __attribute_deprecated__;
243 #endif /* Use BSD. */
247 typedef __sighandler_t sighandler_t;
250 /* 4.4 BSD uses the name `sig_t' for this. */
252 typedef __sighandler_t sig_t;
257 /* Clear all signals from SET. */
258 extern int sigemptyset (sigset_t *__set) __THROW __nonnull ((1));
259 libc_hidden_proto(sigemptyset)
261 /* Set all signals in SET. */
262 extern int sigfillset (sigset_t *__set) __THROW __nonnull ((1));
263 libc_hidden_proto(sigfillset)
265 /* Add SIGNO to SET. */
266 extern int sigaddset (sigset_t *__set, int __signo) __THROW __nonnull ((1));
267 libc_hidden_proto(sigaddset)
269 /* Remove SIGNO from SET. */
270 extern int sigdelset (sigset_t *__set, int __signo) __THROW __nonnull ((1));
271 libc_hidden_proto(sigdelset)
273 /* Return 1 if SIGNO is in SET, 0 if not. */
274 extern int sigismember (__const sigset_t *__set, int __signo)
275 __THROW __nonnull ((1));
278 /* Return non-empty value is SET is not empty. */
279 extern int sigisemptyset (__const sigset_t *__set) __THROW __nonnull ((1));
281 /* Build new signal set by combining the two inputs set using logical AND. */
282 extern int sigandset (sigset_t *__set, __const sigset_t *__left,
283 __const sigset_t *__right) __THROW __nonnull ((1, 2, 3));
285 /* Build new signal set by combining the two inputs set using logical OR. */
286 extern int sigorset (sigset_t *__set, __const sigset_t *__left,
287 __const sigset_t *__right) __THROW __nonnull ((1, 2, 3));
290 /* Get the system-specific definitions of `struct sigaction'
291 and the `SA_*' and `SIG_*'. constants. */
292 # include <bits/sigaction.h>
294 /* Get and/or change the set of blocked signals. */
295 extern int sigprocmask (int __how, __const sigset_t *__restrict __set,
296 sigset_t *__restrict __oset) __THROW;
297 libc_hidden_proto(sigprocmask)
299 /* Change the set of blocked signals to SET,
300 wait until a signal arrives, and restore the set of blocked signals.
302 This function is a cancellation point and therefore not marked with
304 extern int sigsuspend (__const sigset_t *__set) __nonnull ((1));
305 libc_hidden_proto(sigsuspend)
307 /* Get and/or set the action for signal SIG. */
308 extern int sigaction (int __sig, __const struct sigaction *__restrict __act,
309 struct sigaction *__restrict __oact) __THROW;
311 # if 0 /* this is in headers */
312 /* In uclibc, userspace struct sigaction is identical to
313 * "new" struct kernel_sigaction (one from the Linux 2.1.68 kernel).
316 struct old_kernel_sigaction;
317 extern int __syscall_sigaction(int, __const struct old_kernel_sigaction *,
318 struct old_kernel_sigaction *) attribute_hidden;
319 # else /* this is how the function is built */
320 extern __typeof(sigaction) __syscall_sigaction attribute_hidden;
322 /* candidate for attribute_hidden, if NPTL would behave */
323 extern int __syscall_rt_sigaction(int, __const struct sigaction *,
324 struct sigaction *, size_t)
325 # ifndef __UCLIBC_HAS_THREADS_NATIVE__
329 extern __typeof(sigaction) __libc_sigaction;
330 libc_hidden_proto(sigaction)
333 /* Put in SET all signals that are blocked and waiting to be delivered. */
334 extern int sigpending (sigset_t *__set) __THROW __nonnull ((1));
337 /* Select any of pending signals from SET or wait for any to arrive.
339 This function is a cancellation point and therefore not marked with
341 extern int sigwait (__const sigset_t *__restrict __set, int *__restrict __sig)
344 # if defined __USE_POSIX199309 && defined __UCLIBC_HAS_REALTIME__
345 /* Select any of pending signals from SET and place information in INFO.
347 This function is a cancellation point and therefore not marked with
349 extern int sigwaitinfo (__const sigset_t *__restrict __set,
350 siginfo_t *__restrict __info) __nonnull ((1));
352 extern __typeof(sigwaitinfo) __sigwaitinfo attribute_hidden;
355 /* Select any of pending signals from SET and place information in INFO.
356 Wait the time specified by TIMEOUT if no signal is pending.
358 This function is a cancellation point and therefore not marked with
360 extern int sigtimedwait (__const sigset_t *__restrict __set,
361 siginfo_t *__restrict __info,
362 __const struct timespec *__restrict __timeout)
365 extern __typeof(sigtimedwait) __sigtimedwait attribute_hidden;
368 /* Send signal SIG to the process PID. Associate data in VAL with the
370 extern int sigqueue (__pid_t __pid, int __sig, __const union sigval __val)
372 # endif /* Use POSIX 199306. */
374 #endif /* Use POSIX. */
378 # ifdef __UCLIBC_HAS_SYS_SIGLIST__
379 /* Names of the signals. This variable exists only for compatibility.
380 Use `strsignal' instead (see <string.h>). */
381 # define _sys_siglist sys_siglist
382 extern __const char *__const sys_siglist[_NSIG];
385 #ifndef __UCLIBC_STRICT_HEADERS__
386 /* Structure passed to `sigvec'. */
389 __sighandler_t sv_handler; /* Signal handler. */
390 int sv_mask; /* Mask of signals to be blocked. */
392 int sv_flags; /* Flags (see below). */
393 # define sv_onstack sv_flags /* 4.2 BSD compatibility. */
396 /* Bits in `sv_flags'. */
397 # define SV_ONSTACK (1 << 0)/* Take the signal on the signal stack. */
398 # define SV_INTERRUPT (1 << 1)/* Do not restart system calls. */
399 # define SV_RESETHAND (1 << 2)/* Reset handler to SIG_DFL on receipt. */
404 /* If VEC is non-NULL, set the handler for SIG to the `sv_handler' member
405 of VEC. The signals in `sv_mask' will be blocked while the handler runs.
406 If the SV_RESETHAND bit is set in `sv_flags', the handler for SIG will be
407 reset to SIG_DFL before `sv_handler' is entered. If OVEC is non-NULL,
408 it is filled in with the old information for SIG. */
409 extern int sigvec (int __sig, __const struct sigvec *__vec,
410 struct sigvec *__ovec) __THROW;
414 /* Get machine-dependent `struct sigcontext' and signal subcodes. */
415 # include <bits/sigcontext.h>
418 /* Restore the state saved in SCP. */
419 extern int sigreturn (struct sigcontext *__scp) __THROW;
422 #endif /* use BSD. */
425 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
427 # ifdef __UCLIBC_SUSV4_LEGACY__
428 /* If INTERRUPT is nonzero, make signal SIG interrupt system calls
429 (causing them to fail with EINTR); if INTERRUPT is zero, make system
430 calls be restarted after signal SIG. */
431 extern int siginterrupt (int __sig, int __interrupt) __THROW;
434 # include <bits/sigstack.h>
436 /* This will define `ucontext_t' and `mcontext_t'. */
437 /* SuSv4 obsoleted include/ucontext.h */
438 # include <sys/ucontext.h>
442 /* Run signals handlers on the stack specified by SS (if not NULL).
443 If OSS is not NULL, it is filled in with the old signal stack status.
444 This interface is obsolete and on many platform not implemented. */
445 extern int sigstack (struct sigstack *__ss, struct sigstack *__oss)
446 __THROW __attribute_deprecated__;
449 /* Alternate signal handler stack interface.
450 This interface should always be preferred over `sigstack'. */
451 extern int sigaltstack (__const struct sigaltstack *__restrict __ss,
452 struct sigaltstack *__restrict __oss) __THROW;
454 #endif /* use BSD or X/Open Unix. */
456 #if defined __USE_XOPEN_EXTENDED && defined __UCLIBC_HAS_OBSOLETE_BSD_SIGNAL__
457 /* Simplified interface for signal management. */
459 /* Add SIG to the calling process' signal mask. */
460 extern int sighold (int __sig) __THROW;
462 /* Remove SIG from the calling process' signal mask. */
463 extern int sigrelse (int __sig) __THROW;
465 /* Set the disposition of SIG to SIG_IGN. */
466 extern int sigignore (int __sig) __THROW;
468 /* Set the disposition of SIG. */
469 extern __sighandler_t sigset (int __sig, __sighandler_t __disp) __THROW;
472 #if defined __UCLIBC_HAS_THREADS__ && (defined __USE_POSIX199506 || defined __USE_UNIX98)
473 /* Some of the functions for handling signals in threaded programs must
475 # include <bits/pthreadtypes.h>
476 # include <bits/sigthread.h>
479 /* The following functions are used internally in the C library and in
480 other code which need deep insights. */
482 /* Return number of available real-time signal with highest priority. */
483 extern int __libc_current_sigrtmin (void) __THROW;
484 /* Return number of available real-time signal with lowest priority. */
485 extern int __libc_current_sigrtmax (void) __THROW;
487 #endif /* signal.h */
491 #endif /* not signal.h */