Description

   Calling the raise function has one of the following results:

   o  If raise specifies a sig argument that is outside the range
      defined in the <signal.h> header file, then the raise function
      returns 0, and the errno variable is set to EINVAL.

   o  If signal, ssignal, or sigvec establishes SIG_DFL (default
      action) for the signal, then the functions do not return. The
      image is exited with the OpenVMS error code corresponding to
      the signal.

   o  If signal, ssignal, or sigvec establishes SIG_IGN (ignore
      signal) as the action for the signal, then raise returns its
      argument, sig.

   o  signal, ssignal, or sigvec must establish an action function
      for the signal. That function is called and its return value
      is returned by raise.

   See also gsignal, signal, ssignal, and sigvec.