signal.h
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- /* Copyright (C) 1991-2003, 2004 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
- /*
- * ISO C99 Standard: 7.14 Signal handling <signal.h>
- */
- #ifndef _SIGNAL_H
- #if !defined __need_sig_atomic_t && !defined __need_sigset_t
- # define _SIGNAL_H
- #endif
- #include <features.h>
- __BEGIN_DECLS
- #include <bits/sigset.h> /* __sigset_t, __sig_atomic_t. */
- /* An integral type that can be modified atomically, without the
- possibility of a signal arriving in the middle of the operation. */
- #if defined __need_sig_atomic_t || defined _SIGNAL_H
- # ifndef __sig_atomic_t_defined
- # define __sig_atomic_t_defined
- __BEGIN_NAMESPACE_STD
- typedef __sig_atomic_t sig_atomic_t;
- __END_NAMESPACE_STD
- # endif
- # undef __need_sig_atomic_t
- #endif
- #if defined __need_sigset_t || (defined _SIGNAL_H && defined __USE_POSIX)
- # ifndef __sigset_t_defined
- # define __sigset_t_defined
- typedef __sigset_t sigset_t;
- # endif
- # undef __need_sigset_t
- #endif
- #ifdef _SIGNAL_H
- #include <bits/types.h>
- #include <bits/signum.h>
- #if defined __USE_XOPEN || defined __USE_XOPEN2K
- # ifndef __pid_t_defined
- typedef __pid_t pid_t;
- # define __pid_t_defined
- #endif
- #ifdef __USE_XOPEN
- # endif
- # ifndef __uid_t_defined
- typedef __uid_t uid_t;
- # define __uid_t_defined
- # endif
- #endif /* Unix98 */
- /* Type of a signal handler. */
- typedef void (*__sighandler_t) (int);
- /* The X/Open definition of `signal' specifies the SVID semantic. Use
- the additional function `sysv_signal' when X/Open compatibility is
- requested. */
- extern __sighandler_t __sysv_signal (int __sig, __sighandler_t __handler)
- __THROW;
- #ifdef __USE_GNU
- extern __sighandler_t sysv_signal (int __sig, __sighandler_t __handler)
- __THROW;
- #endif
- /* Set the handler for the signal SIG to HANDLER, returning the old
- handler, or SIG_ERR on error.
- By default `signal' has the BSD semantic. */
- __BEGIN_NAMESPACE_STD
- #ifdef __USE_BSD
- extern __sighandler_t signal (int __sig, __sighandler_t __handler)
- __THROW;
- #else
- /* Make sure the used `signal' implementation is the SVID version. */
- # ifdef __REDIRECT_NTH
- extern __sighandler_t __REDIRECT_NTH (signal,
- (int __sig, __sighandler_t __handler),
- __sysv_signal);
- # else
- # define signal __sysv_signal
- # endif
- #endif
- __END_NAMESPACE_STD
- #ifdef __USE_XOPEN
- /* The X/Open definition of `signal' conflicts with the BSD version.
- So they defined another function `bsd_signal'. */
- extern __sighandler_t bsd_signal (int __sig, __sighandler_t __handler)
- __THROW;
- #endif
- /* Send signal SIG to process number PID. If PID is zero,
- send SIG to all processes in the current process's process group.
- If PID is < -1, send SIG to all processes in process group - PID. */
- #ifdef __USE_POSIX
- extern int kill (__pid_t __pid, int __sig) __THROW;
- #endif /* Use POSIX. */
- #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
- /* Send SIG to all processes in process group PGRP.
- If PGRP is zero, send SIG to all processes in
- the current process's process group. */
- extern int killpg (__pid_t __pgrp, int __sig) __THROW;
- #endif /* Use BSD || X/Open Unix. */
- __BEGIN_NAMESPACE_STD
- /* Raise signal SIG, i.e., send SIG to yourself. */
- extern int raise (int __sig) __THROW;
- __END_NAMESPACE_STD
- #ifdef __USE_SVID
- /* SVID names for the same things. */
- extern __sighandler_t ssignal (int __sig, __sighandler_t __handler)
- __THROW;
- extern int gsignal (int __sig) __THROW;
- #endif /* Use SVID. */
- #ifdef __USE_MISC
- /* Print a message describing the meaning of the given signal number. */
- extern void psignal (int __sig, __const char *__s);
- #endif /* Use misc. */
- /* The `sigpause' function has two different interfaces. The original
- BSD definition defines the argument as a mask of the signal, while
- the more modern interface in X/Open defines it as the signal
- number. We go with the BSD version unless the user explicitly
- selects the X/Open version.
- This function is a cancellation point and therefore not marked with
- __THROW. */
- extern int __sigpause (int __sig_or_mask, int __is_sig);
- #ifdef __FAVOR_BSD
- /* Set the mask of blocked signals to MASK,
- wait for a signal to arrive, and then restore the mask. */
- extern int sigpause (int __mask) __THROW __attribute_deprecated__;
- #else
- # ifdef __USE_XOPEN
- # ifdef __GNUC__
- extern int sigpause (int __sig) __asm__ ("__xpg_sigpause");
- # else
- /* Remove a signal from the signal mask and suspend the process. */
- # define sigpause(sig) __sigpause ((sig), 1)
- # endif
- # endif
- #endif
- #ifdef __USE_BSD
- /* None of the following functions should be used anymore. They are here
- only for compatibility. A single word (`int') is not guaranteed to be
- enough to hold a complete signal mask and therefore these functions
- simply do not work in many situations. Use `sigprocmask' instead. */
- /* Compute mask for signal SIG. */
- # define sigmask(sig) __sigmask(sig)
- /* Block signals in MASK, returning the old mask. */
- extern int sigblock (int __mask) __THROW __attribute_deprecated__;
- /* Set the mask of blocked signals to MASK, returning the old mask. */
- extern int sigsetmask (int __mask) __THROW __attribute_deprecated__;
- /* Return currently selected signal mask. */
- extern int siggetmask (void) __THROW __attribute_deprecated__;
- #endif /* Use BSD. */
- #ifdef __USE_MISC
- # define NSIG _NSIG
- #endif
- #ifdef __USE_GNU
- typedef __sighandler_t sighandler_t;
- #endif
- /* 4.4 BSD uses the name `sig_t' for this. */
- #ifdef __USE_BSD
- typedef __sighandler_t sig_t;
- #endif
- #ifdef __USE_POSIX
- # ifdef __USE_POSIX199309
- /* We need `struct timespec' later on. */
- # define __need_timespec
- # include <time.h>
- /* Get the `siginfo_t' type plus the needed symbols. */
- # include <bits/siginfo.h>
- # endif
- /* Clear all signals from SET. */
- extern int sigemptyset (sigset_t *__set) __THROW __nonnull ((1));
- /* Set all signals in SET. */
- extern int sigfillset (sigset_t *__set) __THROW __nonnull ((1));
- /* Add SIGNO to SET. */
- extern int sigaddset (sigset_t *__set, int __signo) __THROW __nonnull ((1));
- /* Remove SIGNO from SET. */
- extern int sigdelset (sigset_t *__set, int __signo) __THROW __nonnull ((1));
- /* Return 1 if SIGNO is in SET, 0 if not. */
- extern int sigismember (__const sigset_t *__set, int __signo)
- __THROW __nonnull ((1));
- # ifdef __USE_GNU
- /* Return non-empty value is SET is not empty. */
- extern int sigisemptyset (__const sigset_t *__set) __THROW __nonnull ((1));
- /* Build new signal set by combining the two inputs set using logical AND. */
- extern int sigandset (sigset_t *__set, __const sigset_t *__left,
- __const sigset_t *__right) __THROW __nonnull ((1, 2, 3));
- /* Build new signal set by combining the two inputs set using logical OR. */
- extern int sigorset (sigset_t *__set, __const sigset_t *__left,
- __const sigset_t *__right) __THROW __nonnull ((1, 2, 3));
- # endif /* GNU */
- /* Get the system-specific definitions of `struct sigaction'
- and the `SA_*' and `SIG_*'. constants. */
- # include <bits/sigaction.h>
- /* Get and/or change the set of blocked signals. */
- extern int sigprocmask (int __how, __const sigset_t *__restrict __set,
- sigset_t *__restrict __oset) __THROW;
- /* Change the set of blocked signals to SET,
- wait until a signal arrives, and restore the set of blocked signals.
- This function is a cancellation point and therefore not marked with
- __THROW. */
- extern int sigsuspend (__const sigset_t *__set) __nonnull ((1));
- /* Get and/or set the action for signal SIG. */
- extern int sigaction (int __sig, __const struct sigaction *__restrict __act,
- struct sigaction *__restrict __oact) __THROW;
- /* Put in SET all signals that are blocked and waiting to be delivered. */
- extern int sigpending (sigset_t *__set) __THROW __nonnull ((1));
- /* Select any of pending signals from SET or wait for any to arrive.
- This function is a cancellation point and therefore not marked with
- __THROW. */
- extern int sigwait (__const sigset_t *__restrict __set, int *__restrict __sig)
- __nonnull ((1, 2));
- # ifdef __USE_POSIX199309
- /* Select any of pending signals from SET and place information in INFO.
- This function is a cancellation point and therefore not marked with
- __THROW. */
- extern int sigwaitinfo (__const sigset_t *__restrict __set,
- siginfo_t *__restrict __info) __nonnull ((1));
- /* Select any of pending signals from SET and place information in INFO.
- Wait the time specified by TIMEOUT if no signal is pending.
- This function is a cancellation point and therefore not marked with
- __THROW. */
- extern int sigtimedwait (__const sigset_t *__restrict __set,
- siginfo_t *__restrict __info,
- __const struct timespec *__restrict __timeout)
- __nonnull ((1));
- /* Send signal SIG to the process PID. Associate data in VAL with the
- signal. */
- extern int sigqueue (__pid_t __pid, int __sig, __const union sigval __val)
- __THROW;
- # endif /* Use POSIX 199306. */
- #endif /* Use POSIX. */
- #ifdef __USE_BSD
- /* Names of the signals. This variable exists only for compatibility.
- Use `strsignal' instead (see <string.h>). */
- extern __const char *__const _sys_siglist[_NSIG];
- extern __const char *__const sys_siglist[_NSIG];
- /* Structure passed to `sigvec'. */
- struct sigvec
- {
- __sighandler_t sv_handler; /* Signal handler. */
- int sv_mask; /* Mask of signals to be blocked. */
- int sv_flags; /* Flags (see below). */
- # define sv_onstack sv_flags /* 4.2 BSD compatibility. */
- };
- /* Bits in `sv_flags'. */
- # define SV_ONSTACK (1 << 0)/* Take the signal on the signal stack. */
- # define SV_INTERRUPT (1 << 1)/* Do not restart system calls. */
- # define SV_RESETHAND (1 << 2)/* Reset handler to SIG_DFL on receipt. */
- /* If VEC is non-NULL, set the handler for SIG to the `sv_handler' member
- of VEC. The signals in `sv_mask' will be blocked while the handler runs.
- If the SV_RESETHAND bit is set in `sv_flags', the handler for SIG will be
- reset to SIG_DFL before `sv_handler' is entered. If OVEC is non-NULL,
- it is filled in with the old information for SIG. */
- extern int sigvec (int __sig, __const struct sigvec *__vec,
- struct sigvec *__ovec) __THROW;
- /* Get machine-dependent `struct sigcontext' and signal subcodes. */
- # include <bits/sigcontext.h>
- /* Restore the state saved in SCP. */
- extern int sigreturn (struct sigcontext *__scp) __THROW;
- #endif /* use BSD. */
- #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
- /* If INTERRUPT is nonzero, make signal SIG interrupt system calls
- (causing them to fail with EINTR); if INTERRUPT is zero, make system
- calls be restarted after signal SIG. */
- extern int siginterrupt (int __sig, int __interrupt) __THROW;
- # include <bits/sigstack.h>
- # ifdef __USE_XOPEN
- /* This will define `ucontext_t' and `mcontext_t'. */
- # include <sys/ucontext.h>
- # endif
- /* Run signals handlers on the stack specified by SS (if not NULL).
- If OSS is not NULL, it is filled in with the old signal stack status.
- This interface is obsolete and on many platform not implemented. */
- extern int sigstack (struct sigstack *__ss, struct sigstack *__oss)
- __THROW __attribute_deprecated__;
- /* Alternate signal handler stack interface.
- This interface should always be preferred over `sigstack'. */
- extern int sigaltstack (__const struct sigaltstack *__restrict __ss,
- struct sigaltstack *__restrict __oss) __THROW;
- #endif /* use BSD or X/Open Unix. */
- #ifdef __USE_XOPEN_EXTENDED
- /* Simplified interface for signal management. */
- /* Add SIG to the calling process' signal mask. */
- extern int sighold (int __sig) __THROW;
- /* Remove SIG from the calling process' signal mask. */
- extern int sigrelse (int __sig) __THROW;
- /* Set the disposition of SIG to SIG_IGN. */
- extern int sigignore (int __sig) __THROW;
- /* Set the disposition of SIG. */
- extern __sighandler_t sigset (int __sig, __sighandler_t __disp) __THROW;
- #endif
- #if defined __USE_POSIX199506 || defined __USE_UNIX98
- /* Some of the functions for handling signals in threaded programs must
- be defined here. */
- # include <bits/pthreadtypes.h>
- # include <bits/sigthread.h>
- #endif /* use Unix98 */
- /* The following functions are used internally in the C library and in
- other code which need deep insights. */
- /* Return number of available real-time signal with highest priority. */
- extern int __libc_current_sigrtmin (void) __THROW;
- /* Return number of available real-time signal with lowest priority. */
- extern int __libc_current_sigrtmax (void) __THROW;
- #endif /* signal.h */
- __END_DECLS
- #endif /* not signal.h */