alarm_sample.c

来自「Linux网络编程PPT和源码,供学习参考」· C语言 代码 · 共 27 行

#include <unistd.h>
#include <sys/types.h>
#include <stdio.h>
#include <signal.h>
#include <sys/time.h>
void sig_handle(int signum)
{
	printf("alarm!\n");
}

int main(int argc,char *argv[])
{
	struct itimerval timer_val;
	timer_val.it_interval.tv_sec=3;	//下个值
	timer_val.it_interval.tv_usec=300;
	timer_val.it_value.tv_sec=1;	//当前值
	timer_val.it_value.tv_usec=0;
	signal(SIGALRM,sig_handle);	//安装信号SIGALRM,信号处理函数sig_handle
	setitimer(ITIMER_REAL,&timer_val,0);	//在1秒后发送信号,下一次为3秒后发送信号
	while(1)
	{
		sleep(1);
	}
	printf("hello world\n");
	return 0;
}