debian man page for io_close

io_close(3)						     Library Functions Manual						       io_close(3)

NAME
       io_close - close a file descriptor

SYNTAX
       #include <io.h>

       void io_close(int64 fd);

DESCRIPTION
       io_close  eliminates the descriptor numbered fd. This usually does not mean eliminating the object that the descriptor is talking to.  (For
       example, if a descriptor writes to a named disk file, closing the descriptor will not remove the file; it simply removes one way of writing
       to the file. On the other hand, a pipe disappears as soon as no descriptors refer to it.)

       io_close has no return value; it always succeeds in deallocating the memory used for the descriptor.  If fd is not the number of a descrip-
       tor, io_close has no effect.

       io_close() is like close(), but it also removes the descriptor from the internal io_wait() data structures.   If  you  called  io_fd  on  a
       descriptor, you need to use io_close to close it, not just close().

SEE ALSO
       io_wait(3), io_canwrite(3)

																       io_close(3)