1/* POSIX compatible signal blocking.
2   Copyright (C) 2006 Free Software Foundation, Inc.
3   Written by Bruno Haible <bruno@clisp.org>, 2006.
4
5   This program is free software; you can redistribute it and/or modify
6   it under the terms of the GNU General Public License as published by
7   the Free Software Foundation; either version 2, or (at your option)
8   any later version.
9
10   This program is distributed in the hope that it will be useful,
11   but WITHOUT ANY WARRANTY; without even the implied warranty of
12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13   GNU General Public License for more details.
14
15   You should have received a copy of the GNU General Public License
16   along with this program; if not, write to the Free Software Foundation,
17   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
18
19#include <signal.h>
20
21#if ! HAVE_POSIX_SIGNALBLOCKING
22
23/* Mingw defines sigset_t not in <signal.h>, but in <sys/types.h>.  */
24# include <sys/types.h>
25
26# include "verify.h"
27
28/* Maximum signal number + 1.  */
29# ifndef NSIG
30#  define NSIG 32
31# endif
32
33/* This code supports only 32 signals.  */
34verify (NSIG <= 32);
35
36/* A set or mask of signals.  */
37# if !HAVE_SIGSET_T
38typedef unsigned int sigset_t;
39# endif
40
41/* Test whether a given signal is contained in a signal set.  */
42extern int sigismember (const sigset_t *set, int sig);
43
44/* Initialize a signal set to the empty set.  */
45extern int sigemptyset (sigset_t *set);
46
47/* Add a signal to a signal set.  */
48extern int sigaddset (sigset_t *set, int sig);
49
50/* Remove a signal from a signal set.  */
51extern int sigdelset (sigset_t *set, int sig);
52
53/* Fill a signal set with all possible signals.  */
54extern int sigfillset (sigset_t *set);
55
56/* Return the set of those blocked signals that are pending.  */
57extern int sigpending (sigset_t *set);
58
59/* If OLD_SET is not NULL, put the current set of blocked signals in *OLD_SET.
60   Then, if SET is not NULL, affect the current set of blocked signals by
61   combining it with *SET as indicated in OPERATION.
62   In this implementation, you are not allowed to change a signal handler
63   while the signal is blocked.  */
64# define SIG_BLOCK   0  /* blocked_set = blocked_set | *set; */
65# define SIG_SETMASK 1  /* blocked_set = *set; */
66# define SIG_UNBLOCK 2  /* blocked_set = blocked_set & ~*set; */
67extern int sigprocmask (int operation, const sigset_t *set, sigset_t *old_set);
68
69#endif
70