Library /sys$common/syshlp/helplib.hlb  —  CRTL  ssignal  Return Values
    x                  The address of the function previously
                       established as the action for the signal.
                       The address may be the value SIG_DFL (0)  or
                       SIG_IGN (1).
    0                  Indicates errors. For this reason, there is
                       no way to know whether a return status of 0
                       indicates failure, or whether it indicates
                       that a previous action was SIG_DFL (0).
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