VMS Help TCPIP Services, Programming Interfaces, Sockets API, ioctl()  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Controls I/O requests to obtain network information.
    Format
      #include  <ioctl.h>
      int ioctl  ( int s, int request, ... /* arg */ );

  Additional Information (explode) :

• Argument
• Description
• Return Values
• Errors