sigaction_new.c

这个是对linux下进程间通信之“信号”的特性进行测试的代码

/*sigaction.c*/
#include <sys/types.h>
#include <unistd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>

/*自定义的信号处理函数*/
void my_func(int signum)
{
	printf("If you want to quit,please try SIGQUIT\n");
}
void my_func2(int signum)
{
	printf("signal block check\n");
}
int main()
{
	sigset_t set,pendset;
	struct sigaction action1,action2;
/*初始化信号集为空*/
	if(sigemptyset(&set)<0)
		perror("sigemptyset");
/*将相应的信号加入信号集*/
	if(sigaddset(&set,SIGQUIT)<0)
		perror("sigaddset");
	if(sigaddset(&set,SIGINT)<0)
		perror("sigaddset");
	if(sigaddset(&set,SIGRTMIN)<0)
		perror("sigaddset");
/*设置信号集屏蔽字*/
	sigemptyset(&action1.sa_mask);
//	sigaddset(&action1.sa_mask,SIGINT);
	action1.sa_handler=my_func;
	action1.sa_flags=0;
	sigaction(SIGRTMIN,&action1,NULL);

	sigemptyset(&action2.sa_mask);
//	sigaddset(&action2.sa_mask,SIGQUIT);
	action2.sa_handler = my_func2;
	action2.sa_flags=0;
	sigaction(SIGINT,&action2,NULL);

	if(sigprocmask(SIG_BLOCK,&set,NULL)<0)
		perror("sigprocmask");
	else
	{
		printf("blocked\n");
		sleep(5);
	}
	if(sigprocmask(SIG_UNBLOCK,&set,NULL)<0)
		perror("sigprocmask");
	else
		printf("unblock\n");
//对相应的信号进行循环处理
	while(1){
	/*	if(sigismember(&set,SIGINT)){
		sigemptyset(&action1.sa_mask);
		action1.sa_handler=my_func;
		sigaction(SIGINT,&action1,NULL);
		}else if(sigismember(&set,SIGQUIT)){
			sigemptyset(&action2.sa_mask);
			action2.sa_handler = SIG_DFL;
			sigaction(SIGTERM,&action2,NULL);
		}*/
	printf("checking!!!!\n");
	sleep(2);
	}
}