/* Copyright (C) 1991-2018 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, see

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<http://www.gnu.org/licenses/>. */

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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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#define _SIGNAL_H

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#include <features.h>

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__BEGIN_DECLS

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#include <bits/types.h>

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#include <bits/signum.h>

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#include <bits/types/sig_atomic_t.h>

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#if defined __USE_POSIX

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#include <bits/types/sigset_t.h>

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#endif

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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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# include <bits/types/struct_timespec.h>

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#endif

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#if defined __USE_POSIX199309 || defined __USE_XOPEN_EXTENDED

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# include <bits/types/siginfo_t.h>

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# include <bits/siginfo-consts.h>

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#endif

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#ifdef __USE_MISC

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# include <bits/types/sigval_t.h>

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#endif

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#ifdef __USE_POSIX199309

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# include <bits/types/sigevent_t.h>

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# include <bits/sigevent-consts.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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#ifdef __USE_MISC

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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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#if defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K8

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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_MISC || 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 misc || X/Open Unix. */

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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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#ifdef __USE_MISC

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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 misc. */

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#ifdef __USE_XOPEN2K8

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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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/* 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 in X/Open defines the argument as the

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signal number. This requires redirecting to another function

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because the default version in glibc uses an old BSD interface.

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This function is a cancellation point and therefore not marked with

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__THROW. */

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#ifdef __USE_XOPEN_EXTENDED

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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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extern int __sigpause (int __sig_or_mask, int __is_sig);

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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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#ifdef __USE_MISC

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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) ((int)(1u << ((sig) - 1)))

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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 misc. */

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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_MISC

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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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# ifdef __USE_POSIX199506

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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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# endif /* Use POSIX 1995. */

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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_MISC

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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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/* 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 misc. */

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#if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8

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# define __need_size_t

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# include <stddef.h>

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# include <bits/types/stack_t.h>

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# if defined __USE_XOPEN || defined __USE_XOPEN2K8

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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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#endif /* Use POSIX.1-2008 or X/Open Unix. */

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#if defined __USE_XOPEN_EXTENDED || defined __USE_MISC

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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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# include <bits/ss_flags.h>

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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 stack_t *__restrict __ss,

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stack_t *__restrict __oss) __THROW;

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#endif /* __USE_XOPEN_EXTENDED || __USE_MISC */

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#if ((defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K8) \

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|| defined __USE_MISC)

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# include <bits/types/struct_sigstack.h>

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#endif

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#if ((defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K) \

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|| defined __USE_MISC)

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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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#endif

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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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#define SIGRTMIN (__libc_current_sigrtmin ())

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#define SIGRTMAX (__libc_current_sigrtmax ())

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__END_DECLS

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#endif /* not signal.h */

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