Queued SIGIO HOWTO

• fcntl(socketd, F_SETOWN, getpid())

• fcntl(socketfd, F_SETSIG, rtsig)

• SA_SIGINFO signal handler gets siginfo_t argument.

• siginfo->si_fd contains fd

• On overflow you get SIGIO and use poll to pick up events.

• sigtimedwait is a nice main loop if you don't want signal handlers.