io_dontwantwrite(3) [debian man page]

io_dontwantwrite(3)					     Library Functions Manual					       io_dontwantwrite(3)

NAME

       io_dontwantwrite - signal that you do not want to write to a descriptor

SYNTAX

       #include <io.h>

       void io_dontwantwrite(int64 fd);

DESCRIPTION

       io_dontwantwrite tells the next io_wait() that you don't want to write to this descriptor for now.  Call io_wantwrite() again if you change
       your mind.

       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)

															       io_dontwantwrite(3)

io_canread(3)						     Library Functions Manual						     io_canread(3)

NAME

       io_canread - return a file descriptor that can be read from

SYNTAX

       #include <io.h>

       int64 io_canread();

DESCRIPTION

       io_canread returns the next file descriptor that can be read from.  You have to have used io_wantread() on the file descriptor earlier, and
       you have to have called io_wait() or io_waituntil().

       These functions then keep an internal data structure on which descriptors were reported readable by the operating system.

       Please note that there is no guarantee that there still is data that can be read from  the  descriptor,	just  that  there  was	data  when
       io_wait() or io_waituntil() were called.  Another process could have read the data before you.  Look at the result from io_tryread().

       If  there  are  no  more  descriptors  that  you  can  write to without blocking, io_canwrite will return -1.  In this case you should call
       io_wait() or io_waituntil() again.

       You should use io_tryread(3) to read from the descriptor, not plain read(2).  If you use read(2) and you get EAGAIN, call io_eagain(3).

SEE ALSO

       io_wait(3), io_canwrite(3), io_eagain(3)

																     io_canread(3)