waitpid.c

关于进程间通信的代码集锦

#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>

int main()
{
	pid_t pc,pr;
	pc=fork();
	if(pc<0)
	{
		printf("Error fork.\n");
	}
	else if(pc==0)
	{
		sleep(5);
		exit(0);
	}
	else
	{
		do
		{
			pr=waitpid(pc,NULL,WNOHANG);
			if(pr==0)
			{
				printf("The child process not exit.\n");
			}
		}while(pr==0);
		if(pr==pc)
		{
			printf("Get child %d\n",pr);
		}
		else
		{
			printf("some error occured.");
		}
	}
	return 0;
}