在c unix中使用flock（），我在另一个进程中尝试打开文件时遇到哪种错误？

I'm using flock() in my code server/client to allow the reading of file only to one process. But if another process try to open that file the computation go in pause I think, instead I would handle an error to give an output that explain to user what's the matter. How can I do it? I'm using flock() in my code server/client to a