SIGPENDING(2) BSD System Calls Manual SIGPENDING(2)
sigpending -- get pending signals
The sigpending function returns a mask of the signals pending for deliv-
ery to the calling process in the location indicated by set. 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 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 (``POSIX.1'').
BSD January 12, 1994 BSD