NAME¶
io_wantwrite - signal that you want to write to a descriptor
SYNTAX¶
#include <io.h>
void
io_wantwrite(int64 fd);
DESCRIPTION¶
io_wantwrite tells the next io_wait() that you want to write to this descriptor.
Call io_dontwantwrite() again if you change your mind.
The next time you call io_wait(), it will look whether this descriptor becomes
writeable, too. You can then use io_canwrite() to check whether the descriptor
has become writable.
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_canwrite(3),
io_wantwrite(3),
io_fd(3)