sleep会被其它信号(SIGALRM,SIGINT)唤醒的测试

http://blog.csdn.net/sabalol/article/details/4544507

在应用程序中使用了sleep函数和信号处理，现在有个问题，一但收到信号就造成sleep函数中断，延时就不足。这个问题该如何解决呢？

方法

#include <stdio.h>
 #include <unistd.h>
 #include <signal.h>

 int sleep_with_restart(int second);
 void signal_handler_int(int s);
 

void signal_handler_alarm(int s); 

int sleep_with_restart(int second)
 {
     int left;

     left = second;
 #if 0 //case 1, sleep can be wake up by alarm or Ctrl + C, and the function will exit
     left = sleep(left);//sleep()被中断之后会返回剩余的秒数
#endif

 #if 1 //case 2, sleep can be wake up by alarm or Ctrl + C, but we can restart it! because the sleep function will return the left second after be wake up!    
    while (left > 0)
     {
         fprintf(stdout, "Restarting sleep(%d) .../n", left);
         left = sleep(left);//sleep()被中断之后会返回剩余的秒数     }
 #endif

     return 0;
 }

 void signal_handler_int(int s)
 {
     fprintf(stdout,"Caught signal SIGINT %d .../n", s);
 } 

void signal_handler_alarm(int s)
 {
     fprintf(stdout,"Caught signal SIGALRM %d .../n", s);
 } 

int main(int argc, char **argv)
 {
     signal(SIGINT, signal_handler_int);
     signal(SIGALRM, signal_handler_alarm);

     alarm(3);
     sleep_with_restart(10);
     return 0;
 }