signal1.c

来自「操作系统的一些实验」· C语言 代码 · 共 60 行

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

void waiting();
void stop();

int wait_mark;

main()
{
	int p1,p2;
	while((p1=fork())==-1);
	if(p1>0)
	{
		while((p2=fork())==-1);
		if(p2>0)
		{
			wait_mark=1;
			signal(SIGINT,stop);
			waiting();
			kill(p1,16);
			kill(p2,17);
			wait(0);
			wait(0);
			printf("parent process !\n");
			exit(0);
		}
		else
		{
			wait_mark=0;
			signal(17,stop);
			waiting();
			lockf(1,1,0);
			printf("child 2 process!\n");
			lockf(1,0,0);
			exit(0);
		}
	}
	else
	{
		wait_mark=0;
		signal(16,stop);
		waiting();
		lockf(1,1,0);
		printf("child 1 process!\n");
		lockf(1,0,0);
		exit(0);
	}
}

void waiting()
{
	while(wait_mark!=0);
}

void stop()
{
	wait_mark=0;
}