/*    * 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() sets the time until the next timer * expiration to value.it_value and arms the timer. * Test is identical to timer_create() 1-1.c. * Steps: * 1.  Set up sigevent structure to send signal SIGTOTEST on timer *     expiration. * 2.  Set up sigaction structure to catch signal SIGTOTEST on timer *     expiration * 3.  Create timer using timer_create(). * 4.  Activate timer using timer_settime() and then sleep. * 5.  If signal handler is called, continue.  Otherwise, fail. * 6.  If signal handler was called and the time left in sleep ~= the *     delta between the timer time and sleep time, then PASS. *     Otherwise, FAIL. * * 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 itimerspec its;  struct timespec ts, tsleft;  struct sigaction act;  act.sa_handler=handler;  act.sa_flags=0;    its.it_interval.tv_sec = 0;  its.it_interval.tv_nsec = 0;  its.it_value.tv_sec = TIMERSEC;  its.it_value.tv_nsec = 0;    ts.tv_sec=TIMERSEC+SLEEPDELTA;  ts.tv_nsec=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 (timer_settime(tid, 0, &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){	struct sigevent ev;	int err=0;	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,(int *)0);	return err;}void cleanup_module(void){  timer_delete(tid);  pthread_delete_np(th);}