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The
function returns a mask of the signals pending for delivery to the calling
process in the location indicated by Signals may be pending because they
are currently masked, or transiently before delivery (although the latter
case is not normally detectable).
A 0 value indicated that
the call succeeded. A -1 return value indicates an error occurred and is
set to indicated the reason.
The function does not currently detect
any errors.
The function is defined by
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