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 are permitted 6 * provided that the above copyright notice and this paragraph are 7 * duplicated in all such forms and that any documentation, 8 * advertising materials, and other materials related to such 9 * distribution and use acknowledge that the software was developed 10 * by the University of California, Berkeley. The name of the 11 * University may not be used to endorse or promote products derived 12 * from this software without specific prior written permission. 13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 15 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 16 */ 17 18 #if defined(LIBC_SCCS) && !defined(lint) 19 static char sccsid[] = "@(#)siginterrupt.c 5.4 (Berkeley) 08/26/89"; 20 #endif /* LIBC_SCCS and not lint */ 21 22 #include <signal.h> 23 24 /* 25 * Set signal state to prevent restart of system calls 26 * after an instance of the indicated signal. 27 */ 28 siginterrupt(sig, flag) 29 int sig, flag; 30 { 31 extern sigset_t _sigintr; 32 struct sigaction sa; 33 int ret; 34 35 if ((ret = sigaction(sig, (struct sigaction *)0, &sa)) < 0) 36 return (ret); 37 if (flag) { 38 sigaddset(&_sigintr, sig); 39 sa.sa_flags &= ~SA_RESTART; 40 } else { 41 sigdelset(&_sigintr, sig); 42 sa.sa_flags |= SA_RESTART; 43 } 44 return (sigaction(sig, &sa, (struct sigaction *)0)); 45 } 46