get pending signals
() function returns a mask of
the signals pending for delivery 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).
Upon successful completion, the value 0 is returned; otherwise the
value -1 is returned and the global variable
is set to indicate the error.
() function does not currently
detect any errors.
() function is defined by
IEEE Std 1003.1-2008