Library /sys$common/syshlp/helplib.hlb  —  CRTL  sigaddset  Description
    The sigaddset function manipulates sets of signals. 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.

    The sigaddset function adds the individual signal specified by
    sig_number from the signal set specified by set.
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