signal_sample.c

培训材料如何在linux下创建进程和信号发送

#include <signal.h>
#include <sys/types.h>
#include <unistd.h>

int num;
void sig_handle(int signum)
{
	int tmp;
	tmp=num;
	num=999;
	printf("signal number %d\n",signum);
	num=tmp;
}

int main(int argc,char *argv[])
{
	pid_t child;
	signal(SIGUSR1,sig_handle);
	child=fork();
	if (child==0)
	{
		while(1)
		{
			sleep(1);
			num++;
			printf("number is %d\n",num);	
		}
		exit(1);
	}
	printf("read send signal!\n");
	sleep(5);
	kill(child,SIGUSR1);
	sleep(2);
	printf("sssssss\n");
	return 0;
}