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/* POSIX compatible signal blocking.
Copyright (C) 2006 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2006.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
#include <signal.h>
#if ! HAVE_POSIX_SIGNALBLOCKING
/* Mingw defines sigset_t not in <signal.h>, but in <sys/types.h>. */
# include <sys/types.h>
# include "verify.h"
/* Maximum signal number + 1. */
# ifndef NSIG
# define NSIG 32
# endif
/* This code supports only 32 signals. */
verify (NSIG <= 32);
/* A set or mask of signals. */
# if !HAVE_SIGSET_T
typedef unsigned int sigset_t;
# endif
/* Test whether a given signal is contained in a signal set. */
extern int sigismember (const sigset_t *set, int sig);
/* Initialize a signal set to the empty set. */
extern int sigemptyset (sigset_t *set);
/* Add a signal to a signal set. */
extern int sigaddset (sigset_t *set, int sig);
/* Remove a signal from a signal set. */
extern int sigdelset (sigset_t *set, int sig);
/* Fill a signal set with all possible signals. */
extern int sigfillset (sigset_t *set);
/* Return the set of those blocked signals that are pending. */
extern int sigpending (sigset_t *set);
/* If OLD_SET is not NULL, put the current set of blocked signals in *OLD_SET.
Then, if SET is not NULL, affect the current set of blocked signals by
combining it with *SET as indicated in OPERATION.
In this implementation, you are not allowed to change a signal handler
while the signal is blocked. */
# define SIG_BLOCK 0 /* blocked_set = blocked_set | *set; */
# define SIG_SETMASK 1 /* blocked_set = *set; */
# define SIG_UNBLOCK 2 /* blocked_set = blocked_set & ~*set; */
extern int sigprocmask (int operation, const sigset_t *set, sigset_t *old_set);
#endif
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