file.cc

达内IT培训Unix C++第一天源码 是入门Unix 下C++编程的好东西

#include <iostream>
using namespace std;
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <cstring>

int main()
{
	char* username = getlogin();
	if(strcmp(username,"openlab")==0){
		cout << "别捣乱啦" << endl;
		return 0;
	}
	int fd = open("luck",O_WRONLY|O_CREAT|O_EXCL, 0644);
	if(fd<0){
		cout << "失败!" << endl;
		return -1;
	}
	cout << "成功!" << endl;
	write(fd, username, strlen(username)); 
	close(fd);
}