sigpending - get pending signals
The sigpending function returns a mask of the signals pending for delivery
to the calling process in the location indicated by set.
be pending because they are currently masked, or transiently
(although the latter case is not normally detectable).
A 0 value indicated that the call succeeded. A -1 return
an error occurred and errno is set to indicated the reason.
The sigpending function does not currently detect any errors.
The sigpending function is defined by IEEE Std 1003.1-1988
OpenBSD 3.6 January 12, 1994
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