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temporarily
changes the blocked signal mask to the set to which points, and then waits
for a signal to arrive; on return the previous set of masked signals is
restored. The signal mask set is usually empty to indicate that all signals
are to be unblocked for the duration of the call. In normal usage, a signal
is blocked using to begin a critical section, variables modified on the
occurrence of the signal are examined to determine that there is no work
to be done, and the process pauses awaiting work by using with the previous
mask returned by
The function always terminates by being
interrupted, returning -1 with set to
The function
call conforms to
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