/sys$common/syshlp/helplib.hlb CC, Run-time functions, ssignal  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  Allows you to specify the action to take when a particular signal
  is raised.

  Syntax:

       #include <signal.h>

       void (*ssignal (int sig, void (*func) (int,...))) (int,...);