Calling the gsignal function has one of the following results:

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

    o  If signal, ssignal, or sigvec establishes SIG_DFL (default
       action) for the signal, then gsignal does 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 gsignal returns its
       argument, sig.

    o  signal, ssignal, or sigvec must be used to establish an action
       routine for the signal. That function is called and its return
       value is returned by gsignal.

    See the Error and Signal Handling chapter of the C RTL Reference
    Manual for more information.

    See also raise, signal, ssignal, and sigvec.