io_wantwrite - Man Page

#include <io.h>

void io_wantwrite(int64 fd);

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.

io_wait(3), io_canwrite(3), io_wantwrite(3), io_fd(3)

io_dontwantwrite(3), io_wait(3), io_waituntil(3).