Code for directory monitor using Unix concepts in C language

Question

On a server, a process monitors the files in a Unix file system.

If a client sends the file name to be monitored, the server has to send the report to the client whether

Answer 1

Have a look at inotify at http://en.wikipedia.org/wiki/Inotify - linux only I'm afraid.

BSD has kqueue - see http://en.wikipedia.org/wiki/Kqueue.