1 /* 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. 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. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD: src/lib/libc/gen/siginterrupt.c,v 1.2.8.1 2001/03/05 09:34:53 obrien Exp $ 30 * $DragonFly: src/lib/libc/gen/siginterrupt.c,v 1.4 2005/11/13 00:07:42 swildner Exp $ 31 * 32 * @(#)siginterrupt.c 8.1 (Berkeley) 6/4/93 33 */ 34 35 #include "namespace.h" 36 #include <signal.h> 37 #include "un-namespace.h" 38 #include "libc_private.h" 39 40 /* 41 * Set signal state to prevent restart of system calls 42 * after an instance of the indicated signal. 43 */ 44 int 45 siginterrupt(int sig, int flag) 46 { 47 extern sigset_t _sigintr; 48 struct sigaction sa; 49 int ret; 50 51 if ((ret = _sigaction(sig, NULL, &sa)) < 0) 52 return (ret); 53 if (flag) { 54 sigaddset(&_sigintr, sig); 55 sa.sa_flags &= ~SA_RESTART; 56 } else { 57 sigdelset(&_sigintr, sig); 58 sa.sa_flags |= SA_RESTART; 59 } 60 return (_sigaction(sig, &sa, NULL)); 61 } 62