VMS Help CC, Socket Routines, decc$get_sdc  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Returns the socket device channel associated with a socket
    descriptor for direct use with the DEC TCP/IP Services for
    OpenVMS product (formerly the VMS/ULTRIX Connection).
    vaxc$get_sdc is a synonym for decc$get_sdc. Either name
    invokes the same routine.

    Syntax:

      #include <socket.h>

      short int decc$get_sdc(int s);