122123Smckusick /* 222123Smckusick * Copyright (c) 1985 Regents of the University of California. 335306Sbostic * All rights reserved. 435306Sbostic * 5*42627Sbostic * %sccs.include.redist.c% 622123Smckusick */ 718339Sserge 826609Sdonn #if defined(LIBC_SCCS) && !defined(lint) 9*42627Sbostic static char sccsid[] = "@(#)ualarm.c 5.4 (Berkeley) 06/01/90"; 1035306Sbostic #endif /* LIBC_SCCS and not lint */ 1122123Smckusick 1218339Sserge #include <sys/time.h> 1318339Sserge 1418339Sserge #define USPS 1000000 /* # of microseconds in a second */ 1518339Sserge 1618339Sserge /* 1718339Sserge * Generate a SIGALRM signal in ``usecs'' microseconds. 1818339Sserge * If ``reload'' is non-zero, keep generating SIGALRM 1918339Sserge * every ``reload'' microseconds after the first signal. 2018339Sserge */ 2118339Sserge unsigned 2218339Sserge ualarm(usecs, reload) 2318339Sserge register unsigned usecs; 2418339Sserge register unsigned reload; 2518339Sserge { 2618339Sserge struct itimerval new, old; 2718339Sserge 2818339Sserge new.it_interval.tv_usec = reload % USPS; 2918339Sserge new.it_interval.tv_sec = reload / USPS; 3018339Sserge 3118339Sserge new.it_value.tv_usec = usecs % USPS; 3218339Sserge new.it_value.tv_sec = usecs / USPS; 3318339Sserge 3418339Sserge if (setitimer(ITIMER_REAL, &new, &old) == 0) 3518339Sserge return (old.it_value.tv_sec * USPS + old.it_value.tv_usec); 3618339Sserge /* else */ 3718339Sserge return (-1); 3818339Sserge } 39