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);
201 /* Set the mask of blocked signals to MASK,
202 wait for a signal to arrive, and then restore the mask. */
203 extern int sigpause (int __mask) __THROW __attribute_deprecated__;
204 # define sigpause(mask) __sigpause ((mask), 0)
207 /* Remove a signal from the signal mask and suspend the process. */
208 # define sigpause(sig) __sigpause ((sig), 1)
211 #endif /* __UCLIBC_SUSV4_LEGACY__ */
214 /* None of the following functions should be used anymore. They are here
215 only for compatibility. A single word (`int') is not guaranteed to be
216 enough to hold a complete signal mask and therefore these functions
217 simply do not work in many situations. Use `sigprocmask' instead. */
219 /* Compute mask for signal SIG. */
220 # define sigmask(sig) __sigmask(sig)
222 /* Block signals in MASK, returning the old mask. */
224 extern int sigblock (int __mask) __THROW;
225 /* collides with libc_hidden_proto: __attribute_deprecated__; */
226 libc_hidden_proto(sigblock)
228 extern int sigblock (int __mask) __THROW __attribute_deprecated__;
231 /* Set the mask of blocked signals to MASK, returning the old mask. */
233 extern int sigsetmask (int __mask) __THROW;
234 /* collides with libc_hidden_proto: __attribute_deprecated__; */
235 libc_hidden_proto(sigsetmask)
237 extern int sigsetmask (int __mask) __THROW __attribute_deprecated__;
240 /* Return currently selected signal mask. */
241 extern int siggetmask (void) __THROW __attribute_deprecated__;
242 #endif /* Use BSD. */
246 typedef __sighandler_t sighandler_t;
249 /* 4.4 BSD uses the name `sig_t' for this. */
251 typedef __sighandler_t sig_t;
256 /* Clear all signals from SET. */
257 extern int sigemptyset (sigset_t *__set) __THROW __nonnull ((1));
259 /* Set all signals in SET. */
260 extern int sigfillset (sigset_t *__set) __THROW __nonnull ((1));
262 /* Add SIGNO to SET. */
263 extern int sigaddset (sigset_t *__set, int __signo) __THROW __nonnull ((1));
264 libc_hidden_proto(sigaddset)
266 /* Remove SIGNO from SET. */
267 extern int sigdelset (sigset_t *__set, int __signo) __THROW __nonnull ((1));
268 libc_hidden_proto(sigdelset)
270 /* Return 1 if SIGNO is in SET, 0 if not. */
271 extern int sigismember (__const sigset_t *__set, int __signo)
272 __THROW __nonnull ((1));
275 /* Return non-empty value is SET is not empty. */
276 extern int sigisemptyset (__const sigset_t *__set) __THROW __nonnull ((1));
278 /* Build new signal set by combining the two inputs set using logical AND. */
279 extern int sigandset (sigset_t *__set, __const sigset_t *__left,
280 __const sigset_t *__right) __THROW __nonnull ((1, 2, 3));
282 /* Build new signal set by combining the two inputs set using logical OR. */
283 extern int sigorset (sigset_t *__set, __const sigset_t *__left,
284 __const sigset_t *__right) __THROW __nonnull ((1, 2, 3));
287 /* Get the system-specific definitions of `struct sigaction'
288 and the `SA_*' and `SIG_*'. constants. */
289 # include <bits/sigaction.h>
291 /* Get and/or change the set of blocked signals. */
292 extern int sigprocmask (int __how, __const sigset_t *__restrict __set,
293 sigset_t *__restrict __oset) __THROW;
294 libc_hidden_proto(sigprocmask)
296 /* Change the set of blocked signals to SET,
297 wait until a signal arrives, and restore the set of blocked signals.
299 This function is a cancellation point and therefore not marked with
301 extern int sigsuspend (__const sigset_t *__set) __nonnull ((1));
302 libc_hidden_proto(sigsuspend)
304 /* Get and/or set the action for signal SIG. */
305 extern int sigaction (int __sig, __const struct sigaction *__restrict __act,
306 struct sigaction *__restrict __oact) __THROW;
308 # if 0 /* this is in headers */
309 /* In uclibc, userspace struct sigaction is identical to
310 * "new" struct kernel_sigaction (one from the Linux 2.1.68 kernel).
313 struct old_kernel_sigaction;
314 extern int __syscall_sigaction(int, __const struct old_kernel_sigaction *,
315 struct old_kernel_sigaction *) attribute_hidden;
316 # else /* this is how the function is built */
317 extern __typeof(sigaction) __syscall_sigaction attribute_hidden;
319 /* candidate for attribute_hidden, if NPTL would behave */
320 extern int __syscall_rt_sigaction(int, __const struct sigaction *,
321 struct sigaction *, size_t)
322 # ifndef __UCLIBC_HAS_THREADS_NATIVE__
326 extern __typeof(sigaction) __libc_sigaction;
327 libc_hidden_proto(sigaction)
330 /* Put in SET all signals that are blocked and waiting to be delivered. */
331 extern int sigpending (sigset_t *__set) __THROW __nonnull ((1));
334 /* Select any of pending signals from SET or wait for any to arrive.
336 This function is a cancellation point and therefore not marked with
338 extern int sigwait (__const sigset_t *__restrict __set, int *__restrict __sig)
341 # if defined __USE_POSIX199309 && defined __UCLIBC_HAS_REALTIME__
342 /* Select any of pending signals from SET and place information in INFO.
344 This function is a cancellation point and therefore not marked with
346 extern int sigwaitinfo (__const sigset_t *__restrict __set,
347 siginfo_t *__restrict __info) __nonnull ((1));
349 extern __typeof(sigwaitinfo) __sigwaitinfo attribute_hidden;
352 /* Select any of pending signals from SET and place information in INFO.
353 Wait the time specified by TIMEOUT if no signal is pending.
355 This function is a cancellation point and therefore not marked with
357 extern int sigtimedwait (__const sigset_t *__restrict __set,
358 siginfo_t *__restrict __info,
359 __const struct timespec *__restrict __timeout)
362 extern __typeof(sigtimedwait) __sigtimedwait attribute_hidden;
365 /* Send signal SIG to the process PID. Associate data in VAL with the
367 extern int sigqueue (__pid_t __pid, int __sig, __const union sigval __val)
369 # endif /* Use POSIX 199306. */
371 #endif /* Use POSIX. */
375 # ifdef __UCLIBC_HAS_SYS_SIGLIST__
376 /* Names of the signals. This variable exists only for compatibility.
377 Use `strsignal' instead (see <string.h>). */
378 # define _sys_siglist sys_siglist
379 extern __const char *__const sys_siglist[_NSIG];
382 #ifndef __UCLIBC_STRICT_HEADERS__
383 /* Structure passed to `sigvec'. */
386 __sighandler_t sv_handler; /* Signal handler. */
387 int sv_mask; /* Mask of signals to be blocked. */
389 int sv_flags; /* Flags (see below). */
390 # define sv_onstack sv_flags /* 4.2 BSD compatibility. */
393 /* Bits in `sv_flags'. */
394 # define SV_ONSTACK (1 << 0)/* Take the signal on the signal stack. */
395 # define SV_INTERRUPT (1 << 1)/* Do not restart system calls. */
396 # define SV_RESETHAND (1 << 2)/* Reset handler to SIG_DFL on receipt. */
401 /* If VEC is non-NULL, set the handler for SIG to the `sv_handler' member
402 of VEC. The signals in `sv_mask' will be blocked while the handler runs.
403 If the SV_RESETHAND bit is set in `sv_flags', the handler for SIG will be
404 reset to SIG_DFL before `sv_handler' is entered. If OVEC is non-NULL,
405 it is filled in with the old information for SIG. */
406 extern int sigvec (int __sig, __const struct sigvec *__vec,
407 struct sigvec *__ovec) __THROW;
411 /* Get machine-dependent `struct sigcontext' and signal subcodes. */
412 # include <bits/sigcontext.h>
415 /* Restore the state saved in SCP. */
416 extern int sigreturn (struct sigcontext *__scp) __THROW;
419 #endif /* use BSD. */
422 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
424 # ifdef __UCLIBC_SUSV4_LEGACY__
425 /* If INTERRUPT is nonzero, make signal SIG interrupt system calls
426 (causing them to fail with EINTR); if INTERRUPT is zero, make system
427 calls be restarted after signal SIG. */
428 extern int siginterrupt (int __sig, int __interrupt) __THROW;
431 # include <bits/sigstack.h>
433 /* This will define `ucontext_t' and `mcontext_t'. */
434 /* SuSv4 obsoleted include/ucontext.h */
435 # include <sys/ucontext.h>
439 /* Run signals handlers on the stack specified by SS (if not NULL).
440 If OSS is not NULL, it is filled in with the old signal stack status.
441 This interface is obsolete and on many platform not implemented. */
442 extern int sigstack (struct sigstack *__ss, struct sigstack *__oss)
443 __THROW __attribute_deprecated__;
446 /* Alternate signal handler stack interface.
447 This interface should always be preferred over `sigstack'. */
448 extern int sigaltstack (__const struct sigaltstack *__restrict __ss,
449 struct sigaltstack *__restrict __oss) __THROW;
451 #endif /* use BSD or X/Open Unix. */
453 #if defined __USE_XOPEN_EXTENDED && defined __UCLIBC_HAS_OBSOLETE_BSD_SIGNAL__
454 /* Simplified interface for signal management. */
456 /* Add SIG to the calling process' signal mask. */
457 extern int sighold (int __sig) __THROW;
459 /* Remove SIG from the calling process' signal mask. */
460 extern int sigrelse (int __sig) __THROW;
462 /* Set the disposition of SIG to SIG_IGN. */
463 extern int sigignore (int __sig) __THROW;
465 /* Set the disposition of SIG. */
466 extern __sighandler_t sigset (int __sig, __sighandler_t __disp) __THROW;
469 #if defined __UCLIBC_HAS_THREADS__ && (defined __USE_POSIX199506 || defined __USE_UNIX98)
470 /* Some of the functions for handling signals in threaded programs must
472 # include <bits/pthreadtypes.h>
473 # include <bits/sigthread.h>
476 /* The following functions are used internally in the C library and in
477 other code which need deep insights. */
479 /* Return number of available real-time signal with highest priority. */
480 extern int __libc_current_sigrtmin (void) __THROW;
481 /* Return number of available real-time signal with lowest priority. */
482 extern int __libc_current_sigrtmax (void) __THROW;
485 extern sigset_t _sigintr attribute_hidden;
486 /* simplified version without parameter checking */
488 # undef __sigemptyset
489 # define __sigemptyset(ss) (memset(ss, '\0', sizeof(sigset_t)), 0)
491 #endif /* signal.h */
495 #endif /* not signal.h */