17c478bd9Sstevel@tonic-gate /* 2*7257d1b4Sraf * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 37c478bd9Sstevel@tonic-gate * Use is subject to license terms. 47c478bd9Sstevel@tonic-gate */ 57c478bd9Sstevel@tonic-gate 67c478bd9Sstevel@tonic-gate /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 77c478bd9Sstevel@tonic-gate /* All Rights Reserved */ 87c478bd9Sstevel@tonic-gate 97c478bd9Sstevel@tonic-gate /* 107c478bd9Sstevel@tonic-gate * Copyright (c) 1985 Regents of the University of California. 117c478bd9Sstevel@tonic-gate * All rights reserved. The Berkeley software License Agreement 127c478bd9Sstevel@tonic-gate * specifies the terms and conditions for redistribution. 137c478bd9Sstevel@tonic-gate */ 147c478bd9Sstevel@tonic-gate 15*7257d1b4Sraf #pragma ident "%Z%%M% %I% %E% SMI" 16*7257d1b4Sraf 17*7257d1b4Sraf #include "lint.h" 187c478bd9Sstevel@tonic-gate #include <sys/types.h> 197c478bd9Sstevel@tonic-gate #include <sys/time.h> 207c478bd9Sstevel@tonic-gate #include <unistd.h> 217c478bd9Sstevel@tonic-gate 227c478bd9Sstevel@tonic-gate #define USPS 1000000 /* # of microseconds in a second */ 237c478bd9Sstevel@tonic-gate 247c478bd9Sstevel@tonic-gate /* 257c478bd9Sstevel@tonic-gate * Generate a SIGALRM signal in ``usecs'' microseconds. 267c478bd9Sstevel@tonic-gate * If ``reload'' is non-zero, keep generating SIGALRM 277c478bd9Sstevel@tonic-gate * every ``reload'' microseconds after the first signal. 287c478bd9Sstevel@tonic-gate */ 297c478bd9Sstevel@tonic-gate useconds_t 307c478bd9Sstevel@tonic-gate ualarm(useconds_t usecs, useconds_t reload) 317c478bd9Sstevel@tonic-gate { 327c478bd9Sstevel@tonic-gate struct itimerval new, old; 337c478bd9Sstevel@tonic-gate 347c478bd9Sstevel@tonic-gate new.it_interval.tv_usec = reload % USPS; 357c478bd9Sstevel@tonic-gate new.it_interval.tv_sec = reload / USPS; 367c478bd9Sstevel@tonic-gate 377c478bd9Sstevel@tonic-gate new.it_value.tv_usec = usecs % USPS; 387c478bd9Sstevel@tonic-gate new.it_value.tv_sec = usecs / USPS; 397c478bd9Sstevel@tonic-gate 407c478bd9Sstevel@tonic-gate if (setitimer(ITIMER_REAL, &new, &old) != 0) 417c478bd9Sstevel@tonic-gate return (0); /* no errors are defined */ 427c478bd9Sstevel@tonic-gate return (old.it_value.tv_sec * USPS + old.it_value.tv_usec); 437c478bd9Sstevel@tonic-gate } 44