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. */ 34 verify (NSIG <= 32); 35 36 /* A set or mask of signals. */ 37 # if !HAVE_SIGSET_T 38 typedef unsigned int sigset_t; 39 # endif 40 41 /* Test whether a given signal is contained in a signal set. */ 42 extern int sigismember (const sigset_t *set, int sig); 43 44 /* Initialize a signal set to the empty set. */ 45 extern int sigemptyset (sigset_t *set); 46 47 /* Add a signal to a signal set. */ 48 extern int sigaddset (sigset_t *set, int sig); 49 50 /* Remove a signal from a signal set. */ 51 extern int sigdelset (sigset_t *set, int sig); 52 53 /* Fill a signal set with all possible signals. */ 54 extern int sigfillset (sigset_t *set); 55 56 /* Return the set of those blocked signals that are pending. */ 57 extern 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; */ 67 extern int sigprocmask (int operation, const sigset_t *set, sigset_t *old_set); 68 69 #endif 70