1-1.c

最新rtlinux内核源码

/*   
 * 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 1

timer_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);

}