1 /* 2 * Copyright (c) 1989 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: @(#)siginterrupt.c 5.5 (Berkeley) 6/1/90";*/ 36 static char *rcsid = "$Id: siginterrupt.c,v 1.4 1993/11/30 21:21:42 jtc Exp $"; 37 #endif /* LIBC_SCCS and not lint */ 38 39 #include <signal.h> 40 41 /* 42 * Set signal state to prevent restart of system calls 43 * after an instance of the indicated signal. 44 */ 45 siginterrupt(sig, flag) 46 int sig, flag; 47 { 48 extern sigset_t __sigintr; 49 struct sigaction sa; 50 int ret; 51 52 if ((ret = sigaction(sig, (struct sigaction *)0, &sa)) < 0) 53 return (ret); 54 if (flag) { 55 sigaddset(&__sigintr, sig); 56 sa.sa_flags &= ~SA_RESTART; 57 } else { 58 sigdelset(&__sigintr, sig); 59 sa.sa_flags |= SA_RESTART; 60 } 61 return (sigaction(sig, &sa, (struct sigaction *)0)); 62 } 63