1 /* 2 * Copyright (c) 1983 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[] = "@(#)alarm.c 5.3 (Berkeley) 08/02/88"; 20 #endif /* LIBC_SCCS and not lint */ 21 22 /* 23 * Backwards compatible alarm. 24 */ 25 #include <sys/time.h> 26 27 alarm(secs) 28 int secs; 29 { 30 struct itimerval it, oitv; 31 register struct itimerval *itp = ⁢ 32 33 timerclear(&itp->it_interval); 34 itp->it_value.tv_sec = secs; 35 itp->it_value.tv_usec = 0; 36 if (setitimer(ITIMER_REAL, itp, &oitv) < 0) 37 return (-1); 38 if (oitv.it_value.tv_usec) 39 oitv.it_value.tv_sec++; 40 return (oitv.it_value.tv_sec); 41 } 42