NAME¶
io_wantread - signal that you want to read from a descriptor
SYNTAX¶
#include <io.h>
void
io_wantread(int64 fd);
DESCRIPTION¶
io_wantread tells the next io_wait() that you want to read from this descriptor.
Call io_dontwantread() again if you change your mind.
The next time you call io_wait(), it will look whether this descriptor becomes
readable, too. You can then use io_canread() to check whether the descriptor
has become readable.
You have to have called io_fd on the descriptor first (io_pipe and io_socketpair
do this 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.
SEE ALSO¶
io_wait(3),
io_canread(3),
io_wantread(3),
io_fd(3)