VMS Help CC, Run-time functions, DECC$CRTL_INIT  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  Allows you to call the Compaq C RTL from other languages.  It
  initializes the run-time environment and establishes both an exit
  and condition handler.  VAXC$CRTL_INIT is a synonym for
  DECC$CRTL_INIT.  Either name invokes the same routine.

  Syntax:

       #include <signal.h>

       void DECC$CRTL_INIT(void);