Unix domain sockets and select

Question

Just to make sure sure, one can call select on a Unix Domain socket. Correct? Also one can mix different types of sockets in a select statement. Is that correct?

Answer 1

Yes, that is correct. The only type of file descriptor you should not put in a select call is a regular file, because regular files are always considered ready, even if reading from them would block.

Answer 2

of course,a socket/pipe/unix domain/msgqueue and something like that will be ok~

you may use sockpair right now , select / poll / epoll can get it.