zombie.c

数据结构学习点滴

#include "myhdr.h"

int
main()
{
	pid_t pid;
	if((pid=fork())<0)
		printf("fork error\n");
	else if(pid==0)
	{
		if((pid=fork())<0)
			printf("fork error\n");
		else if(pid>0)
			exit(0);
		sleep(2);
		printf("second child,parent pid = %d\n",getppid());
		exit(0);
	}
	if(waitpid(pid,NULL,0)!=pid)
		printf("waitpid error\n");
	exit(0);
}