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fcntl
=====

Syntax
------

     #include <fcntl.h>
     
     int fcntl (int fd, int cmd, ...);

Description
-----------

This function performs the operation specified by CMD on FD.  Note that
it only supports `F_DUPFD' which acts like `dup(fd)' (dup:.) but   
searches empty descriptor from additional argument.

Return Value
------------

If invalid CMD or FD was passed, it returns -1.  In case F_DUPFD, it
returns new descriptor or -1 for error.