1 /* 2 * Copyright (c) 1983 Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #if defined(LIBC_SCCS) && !defined(lint) 9 static char sccsid[] = "@(#)alarm.c 5.4 (Berkeley) 06/01/90"; 10 #endif /* LIBC_SCCS and not lint */ 11 12 /* 13 * Backwards compatible alarm. 14 */ 15 #include <sys/time.h> 16 17 alarm(secs) 18 int secs; 19 { 20 struct itimerval it, oitv; 21 register struct itimerval *itp = ⁢ 22 23 timerclear(&itp->it_interval); 24 itp->it_value.tv_sec = secs; 25 itp->it_value.tv_usec = 0; 26 if (setitimer(ITIMER_REAL, itp, &oitv) < 0) 27 return (-1); 28 if (oitv.it_value.tv_usec) 29 oitv.it_value.tv_sec++; 30 return (oitv.it_value.tv_sec); 31 } 32