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VMS C programming question

The Question is:

     VMS 'C' Programming Question - IOCTL() - Can anyone help ?

     Unix has an ioctl(channel, request, &value) function which, when used
     with the FIONREAD request argument, allows a C programmer to determine
     if there are any characters on a channel waiting to be read.  Multinet
     socket programming for VMS has an identical routine called
     socket_ioctl().

     Is there a normal (not socket) version of IOCTL() available on the
     VAX, using OpenVMS ?

     Hint:  there is an  header file available, and compilation
     goes fine, but I can't find a library to link to.
     Thanks,

The Answer is:

Use of ioctl() requires OpenVMS V7.0 and DEC C 5.2 (or later).  We apologize
for not making the OpenVMS version requirement clear.