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)

                                                                                   io_wantread(3)