Library /sys$common/syshlp/helplib.hlb  —  CRTL  sigismember  Description
    The sigismember function tests whether sig_number is a member of
    the signal set pointed to by set.

    This function operates on data objects that you can address by
    the application, not on any set of signals known to the system.
    For example, this function does not operate on the set blocked
    from delivery to a process or the set pending for a process.
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