io_fd man page on Alpinelinux

io_fd man page on Alpinelinux

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io_fd(3)							      io_fd(3)

NAME
       io_fd - prepare descriptor for io_wait

SYNTAX
       #include <io.h>

       int io_fd(int64 fd);

DESCRIPTION
       If  you want to use io_canread() and io_canwrite() on a descriptor, you
       have to use io_wait() on it first, and  io_wait()  has  to  know	 which
       descriptors you are interested in.  Use io_fd() for this.

       io_pipe and io_socketpair already call io_fd 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.	 It does not work on files.

RETURN VALUE
       io_fd returns 1 on success, 0 on error.

SEE ALSO
       io_wait(3), io_wantread(3), io_canread(3), io_eagain(3), io_nonblock(3)

								      io_fd(3)

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