| 1 | /* POSIX compatible signal blocking.
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| 2 | Copyright (C) 2006 Free Software Foundation, Inc.
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| 3 | Written by Bruno Haible <bruno@clisp.org>, 2006.
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| 4 |
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| 5 | This program is free software; you can redistribute it and/or modify
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| 6 | it under the terms of the GNU General Public License as published by
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| 7 | the Free Software Foundation; either version 2, or (at your option)
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| 8 | any later version.
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| 9 |
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| 10 | This program is distributed in the hope that it will be useful,
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 13 | GNU General Public License for more details.
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| 14 |
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| 15 | You should have received a copy of the GNU General Public License
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| 16 | along with this program; if not, write to the Free Software Foundation,
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| 17 | Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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| 18 |
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| 19 | #include <signal.h>
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| 20 |
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| 21 | #if ! HAVE_POSIX_SIGNALBLOCKING
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| 22 |
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| 23 | /* Mingw defines sigset_t not in <signal.h>, but in <sys/types.h>. */
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| 24 | # include <sys/types.h>
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| 25 |
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| 26 | # include "verify.h"
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| 27 |
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| 28 | /* Maximum signal number + 1. */
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| 29 | # ifndef NSIG
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| 30 | # define NSIG 32
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| 31 | # endif
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| 32 |
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| 33 | /* This code supports only 32 signals. */
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| 34 | verify (NSIG <= 32);
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| 35 |
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| 36 | /* A set or mask of signals. */
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| 37 | # if !HAVE_SIGSET_T
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| 38 | typedef unsigned int sigset_t;
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| 39 | # endif
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| 40 |
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| 41 | /* Test whether a given signal is contained in a signal set. */
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| 42 | extern int sigismember (const sigset_t *set, int sig);
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| 43 |
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| 44 | /* Initialize a signal set to the empty set. */
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| 45 | extern int sigemptyset (sigset_t *set);
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| 46 |
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| 47 | /* Add a signal to a signal set. */
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| 48 | extern int sigaddset (sigset_t *set, int sig);
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| 49 |
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| 50 | /* Remove a signal from a signal set. */
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| 51 | extern int sigdelset (sigset_t *set, int sig);
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| 52 |
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| 53 | /* Fill a signal set with all possible signals. */
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| 54 | extern int sigfillset (sigset_t *set);
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| 55 |
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| 56 | /* Return the set of those blocked signals that are pending. */
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| 57 | extern int sigpending (sigset_t *set);
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| 58 |
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| 59 | /* If OLD_SET is not NULL, put the current set of blocked signals in *OLD_SET.
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| 60 | Then, if SET is not NULL, affect the current set of blocked signals by
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| 61 | combining it with *SET as indicated in OPERATION.
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| 62 | In this implementation, you are not allowed to change a signal handler
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| 63 | while the signal is blocked. */
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| 64 | # define SIG_BLOCK 0 /* blocked_set = blocked_set | *set; */
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| 65 | # define SIG_SETMASK 1 /* blocked_set = *set; */
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| 66 | # define SIG_UNBLOCK 2 /* blocked_set = blocked_set & ~*set; */
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| 67 | extern int sigprocmask (int operation, const sigset_t *set, sigset_t *old_set);
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| 68 |
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| 69 | #endif
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