411 lines
13 KiB
C
411 lines
13 KiB
C
/* Copyright (C) 1991-2003, 2004, 2007, 2009 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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/*
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* ISO C99 Standard: 7.14 Signal handling <signal.h>
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*/
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#ifndef _SIGNAL_H
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#if !defined __need_sig_atomic_t && !defined __need_sigset_t
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# define _SIGNAL_H
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#endif
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#include <features.h>
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__BEGIN_DECLS
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#include <bits/sigset.h> /* __sigset_t, __sig_atomic_t. */
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/* An integral type that can be modified atomically, without the
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possibility of a signal arriving in the middle of the operation. */
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#if defined __need_sig_atomic_t || defined _SIGNAL_H
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# ifndef __sig_atomic_t_defined
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# define __sig_atomic_t_defined
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__BEGIN_NAMESPACE_STD
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typedef __sig_atomic_t sig_atomic_t;
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__END_NAMESPACE_STD
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# endif
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# undef __need_sig_atomic_t
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#endif
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#if defined __need_sigset_t || (defined _SIGNAL_H && defined __USE_POSIX)
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# ifndef __sigset_t_defined
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# define __sigset_t_defined
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typedef __sigset_t sigset_t;
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# endif
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# undef __need_sigset_t
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#endif
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#ifdef _SIGNAL_H
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#include <bits/types.h>
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#include <bits/signum.h>
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#if defined __USE_XOPEN || defined __USE_XOPEN2K
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# ifndef __pid_t_defined
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typedef __pid_t pid_t;
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# define __pid_t_defined
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#endif
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#ifdef __USE_XOPEN
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# endif
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# ifndef __uid_t_defined
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typedef __uid_t uid_t;
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# define __uid_t_defined
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# endif
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#endif /* Unix98 */
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#ifdef __USE_POSIX199309
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/* We need `struct timespec' later on. */
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# define __need_timespec
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# include <time.h>
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/* Get the `siginfo_t' type plus the needed symbols. */
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# include <bits/siginfo.h>
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#endif
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/* Type of a signal handler. */
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typedef void (*__sighandler_t) (int);
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/* The X/Open definition of `signal' specifies the SVID semantic. Use
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the additional function `sysv_signal' when X/Open compatibility is
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requested. */
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extern __sighandler_t __sysv_signal (int __sig, __sighandler_t __handler)
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__THROW;
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#ifdef __USE_GNU
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extern __sighandler_t sysv_signal (int __sig, __sighandler_t __handler)
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__THROW;
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#endif
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/* Set the handler for the signal SIG to HANDLER, returning the old
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handler, or SIG_ERR on error.
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By default `signal' has the BSD semantic. */
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__BEGIN_NAMESPACE_STD
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#ifdef __USE_BSD
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extern __sighandler_t signal (int __sig, __sighandler_t __handler)
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__THROW;
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#else
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/* Make sure the used `signal' implementation is the SVID version. */
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# ifdef __REDIRECT_NTH
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extern __sighandler_t __REDIRECT_NTH (signal,
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(int __sig, __sighandler_t __handler),
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__sysv_signal);
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# else
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# define signal __sysv_signal
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# endif
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#endif
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__END_NAMESPACE_STD
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#ifdef __USE_XOPEN
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/* The X/Open definition of `signal' conflicts with the BSD version.
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So they defined another function `bsd_signal'. */
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extern __sighandler_t bsd_signal (int __sig, __sighandler_t __handler)
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__THROW;
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#endif
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/* Send signal SIG to process number PID. If PID is zero,
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send SIG to all processes in the current process's process group.
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If PID is < -1, send SIG to all processes in process group - PID. */
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#ifdef __USE_POSIX
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extern int kill (__pid_t __pid, int __sig) __THROW;
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#endif /* Use POSIX. */
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#if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
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/* Send SIG to all processes in process group PGRP.
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If PGRP is zero, send SIG to all processes in
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the current process's process group. */
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extern int killpg (__pid_t __pgrp, int __sig) __THROW;
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#endif /* Use BSD || X/Open Unix. */
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__BEGIN_NAMESPACE_STD
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/* Raise signal SIG, i.e., send SIG to yourself. */
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extern int raise (int __sig) __THROW;
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__END_NAMESPACE_STD
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#ifdef __USE_SVID
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/* SVID names for the same things. */
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extern __sighandler_t ssignal (int __sig, __sighandler_t __handler)
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__THROW;
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extern int gsignal (int __sig) __THROW;
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#endif /* Use SVID. */
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#if defined __USE_MISC || defined __USE_XOPEN2K
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/* Print a message describing the meaning of the given signal number. */
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extern void psignal (int __sig, __const char *__s);
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#endif /* Use misc or POSIX 2008. */
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#ifdef __USE_XOPEN2K
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/* Print a message describing the meaning of the given signal information. */
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extern void psiginfo (__const siginfo_t *__pinfo, __const char *__s);
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#endif /* POSIX 2008. */
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/* The `sigpause' function has two different interfaces. The original
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BSD definition defines the argument as a mask of the signal, while
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the more modern interface in X/Open defines it as the signal
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number. We go with the BSD version unless the user explicitly
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selects the X/Open version.
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This function is a cancellation point and therefore not marked with
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__THROW. */
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extern int __sigpause (int __sig_or_mask, int __is_sig);
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#ifdef __FAVOR_BSD
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/* Set the mask of blocked signals to MASK,
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wait for a signal to arrive, and then restore the mask. */
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extern int sigpause (int __mask) __THROW __attribute_deprecated__;
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#else
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# ifdef __USE_XOPEN
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# ifdef __GNUC__
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extern int sigpause (int __sig) __asm__ ("__xpg_sigpause");
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# else
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/* Remove a signal from the signal mask and suspend the process. */
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# define sigpause(sig) __sigpause ((sig), 1)
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# endif
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# endif
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#endif
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#ifdef __USE_BSD
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/* None of the following functions should be used anymore. They are here
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only for compatibility. A single word (`int') is not guaranteed to be
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enough to hold a complete signal mask and therefore these functions
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simply do not work in many situations. Use `sigprocmask' instead. */
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/* Compute mask for signal SIG. */
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# define sigmask(sig) __sigmask(sig)
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/* Block signals in MASK, returning the old mask. */
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extern int sigblock (int __mask) __THROW __attribute_deprecated__;
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/* Set the mask of blocked signals to MASK, returning the old mask. */
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extern int sigsetmask (int __mask) __THROW __attribute_deprecated__;
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/* Return currently selected signal mask. */
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extern int siggetmask (void) __THROW __attribute_deprecated__;
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#endif /* Use BSD. */
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#ifdef __USE_MISC
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# define NSIG _NSIG
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#endif
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#ifdef __USE_GNU
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typedef __sighandler_t sighandler_t;
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#endif
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/* 4.4 BSD uses the name `sig_t' for this. */
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#ifdef __USE_BSD
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typedef __sighandler_t sig_t;
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#endif
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#ifdef __USE_POSIX
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/* Clear all signals from SET. */
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extern int sigemptyset (sigset_t *__set) __THROW __nonnull ((1));
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/* Set all signals in SET. */
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extern int sigfillset (sigset_t *__set) __THROW __nonnull ((1));
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/* Add SIGNO to SET. */
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extern int sigaddset (sigset_t *__set, int __signo) __THROW __nonnull ((1));
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/* Remove SIGNO from SET. */
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extern int sigdelset (sigset_t *__set, int __signo) __THROW __nonnull ((1));
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/* Return 1 if SIGNO is in SET, 0 if not. */
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extern int sigismember (__const sigset_t *__set, int __signo)
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__THROW __nonnull ((1));
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# ifdef __USE_GNU
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/* Return non-empty value is SET is not empty. */
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extern int sigisemptyset (__const sigset_t *__set) __THROW __nonnull ((1));
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/* Build new signal set by combining the two inputs set using logical AND. */
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extern int sigandset (sigset_t *__set, __const sigset_t *__left,
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__const sigset_t *__right) __THROW __nonnull ((1, 2, 3));
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/* Build new signal set by combining the two inputs set using logical OR. */
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extern int sigorset (sigset_t *__set, __const sigset_t *__left,
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__const sigset_t *__right) __THROW __nonnull ((1, 2, 3));
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# endif /* GNU */
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/* Get the system-specific definitions of `struct sigaction'
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and the `SA_*' and `SIG_*'. constants. */
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# include <bits/sigaction.h>
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/* Get and/or change the set of blocked signals. */
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extern int sigprocmask (int __how, __const sigset_t *__restrict __set,
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sigset_t *__restrict __oset) __THROW;
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/* Change the set of blocked signals to SET,
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wait until a signal arrives, and restore the set of blocked signals.
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This function is a cancellation point and therefore not marked with
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__THROW. */
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extern int sigsuspend (__const sigset_t *__set) __nonnull ((1));
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/* Get and/or set the action for signal SIG. */
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extern int sigaction (int __sig, __const struct sigaction *__restrict __act,
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struct sigaction *__restrict __oact) __THROW;
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/* Put in SET all signals that are blocked and waiting to be delivered. */
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extern int sigpending (sigset_t *__set) __THROW __nonnull ((1));
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/* Select any of pending signals from SET or wait for any to arrive.
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This function is a cancellation point and therefore not marked with
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__THROW. */
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extern int sigwait (__const sigset_t *__restrict __set, int *__restrict __sig)
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__nonnull ((1, 2));
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# ifdef __USE_POSIX199309
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/* Select any of pending signals from SET and place information in INFO.
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This function is a cancellation point and therefore not marked with
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__THROW. */
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extern int sigwaitinfo (__const sigset_t *__restrict __set,
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siginfo_t *__restrict __info) __nonnull ((1));
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/* Select any of pending signals from SET and place information in INFO.
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Wait the time specified by TIMEOUT if no signal is pending.
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This function is a cancellation point and therefore not marked with
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__THROW. */
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extern int sigtimedwait (__const sigset_t *__restrict __set,
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siginfo_t *__restrict __info,
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__const struct timespec *__restrict __timeout)
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__nonnull ((1));
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/* Send signal SIG to the process PID. Associate data in VAL with the
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signal. */
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extern int sigqueue (__pid_t __pid, int __sig, __const union sigval __val)
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__THROW;
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# endif /* Use POSIX 199306. */
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#endif /* Use POSIX. */
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#ifdef __USE_BSD
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/* Names of the signals. This variable exists only for compatibility.
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Use `strsignal' instead (see <string.h>). */
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extern __const char *__const _sys_siglist[_NSIG];
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extern __const char *__const sys_siglist[_NSIG];
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/* Structure passed to `sigvec'. */
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struct sigvec
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{
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__sighandler_t sv_handler; /* Signal handler. */
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int sv_mask; /* Mask of signals to be blocked. */
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int sv_flags; /* Flags (see below). */
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# define sv_onstack sv_flags /* 4.2 BSD compatibility. */
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};
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/* Bits in `sv_flags'. */
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# define SV_ONSTACK (1 << 0)/* Take the signal on the signal stack. */
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# define SV_INTERRUPT (1 << 1)/* Do not restart system calls. */
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# define SV_RESETHAND (1 << 2)/* Reset handler to SIG_DFL on receipt. */
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/* If VEC is non-NULL, set the handler for SIG to the `sv_handler' member
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of VEC. The signals in `sv_mask' will be blocked while the handler runs.
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If the SV_RESETHAND bit is set in `sv_flags', the handler for SIG will be
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reset to SIG_DFL before `sv_handler' is entered. If OVEC is non-NULL,
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it is filled in with the old information for SIG. */
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extern int sigvec (int __sig, __const struct sigvec *__vec,
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struct sigvec *__ovec) __THROW;
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/* Get machine-dependent `struct sigcontext' and signal subcodes. */
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# include <bits/sigcontext.h>
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/* Restore the state saved in SCP. */
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extern int sigreturn (struct sigcontext *__scp) __THROW;
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#endif /* use BSD. */
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#if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
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# define __need_size_t
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# include <stddef.h>
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/* If INTERRUPT is nonzero, make signal SIG interrupt system calls
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(causing them to fail with EINTR); if INTERRUPT is zero, make system
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calls be restarted after signal SIG. */
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extern int siginterrupt (int __sig, int __interrupt) __THROW;
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# include <bits/sigstack.h>
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# ifdef __USE_XOPEN
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/* This will define `ucontext_t' and `mcontext_t'. */
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# include <sys/ucontext.h>
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# endif
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/* Run signals handlers on the stack specified by SS (if not NULL).
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If OSS is not NULL, it is filled in with the old signal stack status.
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This interface is obsolete and on many platform not implemented. */
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extern int sigstack (struct sigstack *__ss, struct sigstack *__oss)
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__THROW __attribute_deprecated__;
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/* Alternate signal handler stack interface.
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This interface should always be preferred over `sigstack'. */
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extern int sigaltstack (__const struct sigaltstack *__restrict __ss,
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struct sigaltstack *__restrict __oss) __THROW;
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#endif /* use BSD or X/Open Unix. */
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#ifdef __USE_XOPEN_EXTENDED
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/* Simplified interface for signal management. */
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/* Add SIG to the calling process' signal mask. */
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extern int sighold (int __sig) __THROW;
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/* Remove SIG from the calling process' signal mask. */
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extern int sigrelse (int __sig) __THROW;
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/* Set the disposition of SIG to SIG_IGN. */
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extern int sigignore (int __sig) __THROW;
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/* Set the disposition of SIG. */
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extern __sighandler_t sigset (int __sig, __sighandler_t __disp) __THROW;
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#endif
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#if defined __USE_POSIX199506 || defined __USE_UNIX98
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/* Some of the functions for handling signals in threaded programs must
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be defined here. */
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# include <bits/pthreadtypes.h>
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# include <bits/sigthread.h>
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#endif /* use Unix98 */
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/* The following functions are used internally in the C library and in
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other code which need deep insights. */
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/* Return number of available real-time signal with highest priority. */
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extern int __libc_current_sigrtmin (void) __THROW;
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/* Return number of available real-time signal with lowest priority. */
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extern int __libc_current_sigrtmax (void) __THROW;
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#endif /* signal.h */
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__END_DECLS
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#endif /* not signal.h */
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