5-2.c

来自「fsmlabs的real time linux的内核」· C语言 代码 · 共 122 行

/*   
 * 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 if timer_settime() is using an absolute clock and the
 * time has already taken place when the test is running that
 * timer_settime() succeeds and the expiration notification is made.
 *
 * Steps:
 * - Setup and then call timer_settime() with date in past.
 * - If timer_settime() returns -1 fail.
 * - If signal handler is not called after a sufficient amount of sleeping,
 *   fail.
 * ***  There is a potential false failure if timer_settime() does not
 *      return before the signal is sent.  TBD if this _should_ happen in
 *      reality, though.
 * For this test, signal SIGTOTEST will be used, clock CLOCK_REALTIME
 * will be used.
 */

#include <time.h>
#include <signal.h>
#include "compat.h"

#define PASS 0
#define FAIL 1
#define UNRESOLVED 2

#define SIGTOTEST SIGALRM

#define DATEINPAST 1037128358 //Nov 13, 2002 ~11:13am

#define LONGSLEEPTIME 10

void handler(int signo)
{
	printf("Caught signal\n");
	printf("Test PASSED\n");
	exit(PASS);
}
timer_t tid;
pthread_t th;

void *th_code(void  *arg)
{
	struct sigaction act;
	struct itimerspec its;
	int flags = 0;

	act.sa_handler=handler;
	act.sa_flags=0;

	its.it_interval.tv_sec = 0;
	its.it_interval.tv_nsec = 0;
	/* THIS SEEMS A BUG. DATEINPAST > 4G. Linux and RTLinux uses both
	   longs for tv_sec & tv_nsecs*/
	/* 
	its.it_value.tv_sec = DATEINPAST;
	its.it_value.tv_nsec = 0;
	*/
	its.it_value.tv_sec= (DATEINPAST / NSECS_PER_SEC);
	its.it_value.tv_nsec= (DATEINPAST % NSECS_PER_SEC);


	/*
	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;
	}

	flags |= TIMER_ABSTIME;
	if (timer_settime(tid, flags, &its, NULL) != 0) {
		perror("timer_settime() did not return success\n");
		return FAIL;
	}

	sleep(LONGSLEEPTIME);

	printf("signal was not sent\n");
	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,(void *) 0);

	return err;

}

void cleanup_module(void)
{
  timer_delete(tid);
  pthread_delete_np(th);
}