waitpid.cc

达内IT培训Unix C++第二天源码 是入门Unix 下C++编程的好东西

#include <iostream>
using namespace std;
#include <unistd.h>
#include <sys/wait.h>

int main()
{
	int ret = fork();
	if(ret<0){
		cout << "error in fork!" << endl;
		return -1;
	}
	if(ret==0){
		for(int i=0; i<5; i++){
			cout << "pid=" << getpid() << ", my parent:" << getppid() << endl;
			sleep(1);
		}
	}
	else{
		for(int i=0; i<10; i++){
			int cid=waitpid(-1,NULL,WNOHANG);
			if(cid<0)
				cout << "NO CHILD PROCESS!" << endl;
			else if(cid==0)
				cout << "CHILD PROCESS IS ALIVE!" << endl;
			else
				cout << "child:" << cid << "exited" << endl;
			cout << "PID=" << getpid() << endl;
			sleep(1);
		}
	}
}