|io_fd(3)||Library Functions Manual||io_fd(3)|
NAME¶io_fd - prepare descriptor for io_wait
int io_fd(int64 fd);
DESCRIPTION¶If you want to use io_canread() and io_canwrite() on a descriptor, you have to use io_wait() on it first, and io_wait() has to know which descriptors you are interested in. Use io_fd() for this.
io_pipe and io_socketpair already call io_fd for you.
Waiting on descriptors only works for sockets, fifos and pipes. It may also work on devices and TTYs, but that is platform dependent -- you should not rely on that. It does not work on files.