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

  Used to establish an OpenVMS exception handler for a particular
  routine.  This function establishes a special Compaq C RTL
  exception handler in the routine that called it.  This special
  handler catches all RTL-related exceptions that occur in later
  routines, and passes on all other exceptions to your handler.

  Syntax:

       #include <signal.h>

       void vaxc$establish(unsigned int (*exception_handler)(void
                           *sigarr, void *mecharr));