sigtest.c

linux下的进程通讯机制的代码例子。消息队列以及共享内存。

#include<stdio.h>
#include<signal.h>
#include<stdlib.h>
static void sig_quit(int);
int main(int argc,char *argv[])
{
	sigset_t newmask,oldmask,pendmask;
	if(signal(SIGQUIT,sig_quit)==SIG_ERR)
	{
		perror("signal");
		exit(EXIT_FAILURE);
	}
	printf("install signal sig_quit\n");
	sigemptyset(&newmask);
	sigaddset(&newmask,SIGQUIT);
	if(sigprocmask(SIG_BLOCK,&newmask,&oldmask)<0)
	{
		perror("signal");
		exit(EXIT_FAILURE);
	}
	printf("block SIGQUTE,wait 15 second\n");
	sleep(15);
	if(sigpending(&pendmask)<0)
	{
		perror("signal");
		exit(EXIT_FAILURE);
	}
	if(sigismember(&pendmask,SIGQUIT))
	printf("\n SIGQUIT pending\n");
	if(sigprocmask(SIG_SETMASK,&oldmask,NULL)<0)
	{
		perror("signal");
		exit(EXIT_FAILURE);
	}
	printf("SIGQUIT unblocked\n");
	sleep(15);
	return 0;
		
}
static void sig_quit(int signo)
{
	printf("catch the signal,the process will quit\n");
	if(signal(SIGQUIT,SIG_DFL)==SIG_ERR)
	{
		perror("signal");
		exit(EXIT_FAILURE);
	}
}