/*    * Copyright (c) 2002, Intel Corporation. All rights reserved. * Created by:  julie.n.fleischer REMOVE-THIS AT intel DOT com * This file is licensed under the GPL license.  For the full content * of this license, see the COPYING file at the top level of this  * source tree. * Test that timer_settime() uses an absolute clock if TIMER_ABSTIME is * set in flags. *  * Uses the same steps as 1-1.c to determine how long the timer lasted. * In order to use an absolute clock, the timer time is determined by: * - Get current time. * - Set the timer to TIMERSEC+current time. * - After the timer goes off, ensure that the timer went off within *   ACCEPTABLEDELTA of TIMERSEC seconds. * * For this test, signal SIGTOTEST will be used, clock CLOCK_REALTIME * will be used. */#include <time.h>#include <signal.h>#include <unistd.h>#include "compat.h"#define PASS 0#define FAIL 1#define UNRESOLVED 2#define SIGTOTEST SIGALRM#define TIMERSEC 2#define SLEEPDELTA 3#define ACCEPTABLEDELTA 1timer_t tid;pthread_t th;void handler(int signo){	printf("Caught signal\n");}void *th_code(void *arg){	struct sigaction act;	struct itimerspec its;	struct timespec beforets, ts, tsleft;	int flags = 0;	act.sa_handler=handler;	act.sa_flags=0;	/*	if (sigemptyset(&act.sa_mask) == -1) {		perror("Error calling sigemptyset\n");		return UNRESOLVED;	}	*/	if (sigaction(SIGTOTEST, &act, 0) == -1) {		perror("Error calling sigaction\n");		return UNRESOLVED;	}	if (clock_gettime(CLOCK_REALTIME, &beforets) != 0) {		perror("clock_gettime() did not return success\n");		return UNRESOLVED;	}	its.it_interval.tv_sec = 0;	its.it_interval.tv_nsec = 0;	its.it_value.tv_sec = beforets.tv_sec+TIMERSEC;	its.it_value.tv_nsec = beforets.tv_nsec;	ts.tv_sec=TIMERSEC+SLEEPDELTA;	ts.tv_nsec=0;	flags |= TIMER_ABSTIME;	if (timer_settime(tid, flags, &its, NULL) != 0) {		perror("timer_settime() did not return success\n");		return UNRESOLVED;	}	if (nanosleep(&ts, &tsleft) != -1) {		perror("nanosleep() not interrupted\n");		return FAIL;	}	if ( abs(tsleft.tv_sec-SLEEPDELTA) <= ACCEPTABLEDELTA) {		printf("Test PASSED\n");		return PASS;	} else {		printf("Timer did not last for correct amount of time\n");		printf("timer: %d != correct %d\n", 				(int) ts.tv_sec- (int) tsleft.tv_sec,				TIMERSEC);		return FAIL;	}	return FAIL;}int init_module(void){ int err=0;  struct sigevent ev;  ev.sigev_notify = SIGEV_SIGNAL;  ev.sigev_signo = SIGTOTEST;  if (timer_create(CLOCK_REALTIME, &ev, &tid) != 0) {    perror("timer_create() did not return success\n");    return UNRESOLVED;  }  err=pthread_create(&th,NULL,th_code,(void *) 0);  return err;}void cleanup_module(void){  timer_delete(tid);  pthread_delete_np(th);}