/* The proper definitions for Linux's sigaction.

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Copyright (C) 1993-2018 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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#ifndef _BITS_SIGACTION_H

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#define _BITS_SIGACTION_H 1

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#ifndef _SIGNAL_H

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# error "Never include <bits/sigaction.h> directly; use <signal.h> instead."

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#endif

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/* Structure describing the action to be taken when a signal arrives. */

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struct sigaction

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{

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/* Signal handler. */

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#if defined __USE_POSIX199309 || defined __USE_XOPEN_EXTENDED

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union

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{

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/* Used if SA_SIGINFO is not set. */

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__sighandler_t sa_handler;

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/* Used if SA_SIGINFO is set. */

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void (*sa_sigaction) (int, siginfo_t *, void *);

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}

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__sigaction_handler;

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# define sa_handler __sigaction_handler.sa_handler

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# define sa_sigaction __sigaction_handler.sa_sigaction

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#else

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__sighandler_t sa_handler;

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#endif

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/* Additional set of signals to be blocked. */

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__sigset_t sa_mask;

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/* Special flags. */

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int sa_flags;

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/* Restore handler. */

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void (*sa_restorer) (void);

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};

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/* Bits in `sa_flags'. */

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#define SA_NOCLDSTOP 1 /* Don't send SIGCHLD when children stop. */

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#define SA_NOCLDWAIT 2 /* Don't create zombie on child death. */

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#define SA_SIGINFO 4 /* Invoke signal-catching function with

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three arguments instead of one. */

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#if defined __USE_XOPEN_EXTENDED || defined __USE_MISC

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# define SA_ONSTACK 0x08000000 /* Use signal stack by using `sa_restorer'. */

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#endif

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#if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8

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# define SA_RESTART 0x10000000 /* Restart syscall on signal return. */

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# define SA_NODEFER 0x40000000 /* Don't automatically block the signal when

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its handler is being executed. */

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# define SA_RESETHAND 0x80000000 /* Reset to SIG_DFL on entry to handler. */

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#endif

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#ifdef __USE_MISC

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# define SA_INTERRUPT 0x20000000 /* Historical no-op. */

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/* Some aliases for the SA_ constants. */

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# define SA_NOMASK SA_NODEFER

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# define SA_ONESHOT SA_RESETHAND

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# define SA_STACK SA_ONSTACK

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#endif

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/* Values for the HOW argument to `sigprocmask'. */

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#define SIG_BLOCK 0 /* Block signals. */

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#define SIG_UNBLOCK 1 /* Unblock signals. */

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#define SIG_SETMASK 2 /* Set the set of blocked signals. */

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#endif

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