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sigsetops.c revision 1.6 
      1 /*-
      2  * Copyright (c) 1989 The Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  */
     33 
     34 #if defined(LIBC_SCCS) && !defined(lint)
     35 /*static char *sccsid = "from: @(#)sigsetops.c	5.3 (Berkeley) 2/23/91";*/
     36 static char *rcsid = "$Id: sigsetops.c,v 1.6 1994/01/10 23:02:09 jtc Exp $";
     37 #endif /* LIBC_SCCS and not lint */
     38 
     39 #include <sys/signal.h>
     40 #include <errno.h>
     41 
     42 #undef sigemptyset
     43 #undef sigfillset
     44 #undef sigaddset
     45 #undef sigdelset
     46 #undef sigismember
     47 
     48 int
     49 sigemptyset(set)
     50 	sigset_t *set;
     51 {
     52 	*set = 0;
     53 	return (0);
     54 }
     55 
     56 int
     57 sigfillset(set)
     58 	sigset_t *set;
     59 {
     60 	*set = ~(sigset_t)0;
     61 	return (0);
     62 }
     63 
     64 int
     65 sigaddset(set, signo)
     66 	sigset_t *set;
     67 	int signo;
     68 {
     69 	if (signo < 0 || signo >= NSIG) {
     70 		errno = EINVAL;
     71 		return -1;
     72 	}
     73 	*set |= sigmask(signo);
     74 	return (0);
     75 }
     76 
     77 int
     78 sigdelset(set, signo)
     79 	sigset_t *set;
     80 	int signo;
     81 {
     82 	if (signo < 0 || signo >= NSIG) {
     83 		errno = EINVAL;
     84 		return -1;
     85 	}
     86 	*set &= ~sigmask(signo);
     87 	return (0);
     88 }
     89 
     90 int
     91 sigismember(set, signo)
     92 	const sigset_t *set;
     93 	int signo;
     94 {
     95 	if (signo < 0 || signo >= NSIG) {
     96 		errno = EINVAL;
     97 		return -1;
     98 	}
     99 	return ((*set & ~sigmask(signo)) != 0);
    100 }
    101