linux编程创建文件

struct timeval log_time;
    gettimeofday(&log_time, NULL);

    sprintf(file_name, "rover_%ld.rtcm3", log_time.tv_sec);
    while(-1 != access(file_name, F_OK))
    {
        sprintf(file_name, "rover_%ld.rtcm3", ++(log_time.tv_sec));
    }
    umask(0000);
    rover_file = creat(file_name, 0666);

access函数判断文件是否存在

umask(0000)清除权限

creat(file_name, 0666)创建文件并设置权限为 0666