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 * 31 * @(#)siginterrupt.c 8.1 (Berkeley) 6/4/93 32 */ 33 34 #include "namespace.h" 35 #include <signal.h> 36 #include "un-namespace.h" 37 #include "libc_private.h" 38 39 /* 40 * Set signal state to prevent restart of system calls 41 * after an instance of the indicated signal. 42 */ 43 int 44 siginterrupt(int sig, int flag) 45 { 46 extern sigset_t _sigintr __dso_hidden; 47 struct sigaction sa; 48 int ret; 49 50 if ((ret = _sigaction(sig, NULL, &sa)) < 0) 51 return (ret); 52 if (flag) { 53 sigaddset(&_sigintr, sig); 54 sa.sa_flags &= ~SA_RESTART; 55 } else { 56 sigdelset(&_sigintr, sig); 57 sa.sa_flags |= SA_RESTART; 58 } 59 return (_sigaction(sig, &sa, NULL)); 60 } 61