Library /sys$common/syshlp/helplib.hlb  —  CRTL  sigdelset  Description
    The sigdelset function deletes the individual signal specified by
    sig_number from the signal set specified 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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