I'm wondering what should be done when poll set these bits? Close socket, ignore it or what?

This polling business seems like it was written by a madman, and I am unsure how to use it to allow for multiple clients to connect to a server and then send their input to all other clients. So ...

The manpages say for poll(2): POLLHUP - Hang up (output only) POLLNVAL - Invalid request: fd not open (output only) What exactly is the difference? Writing a simple program shows that POLLN...

I wrote a small test program to figure out how to talk to poll. I created three files testa,testb,testc and wrote the string hello\n to the first. So, here is my invocation of poll: poll(polls.dat...