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28 .\" @(#)sigsuspend.2 8.2 (Berkeley) 5/16/95
29 .\" $FreeBSD: src/lib/libc/sys/sigsuspend.2,v 1.9.2.4 2001/12/14 18:34:01 ru Exp $
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37 .Nd atomically release blocked signals and wait for interrupt
43 .Fn sigsuspend "const sigset_t *sigmask"
46 temporarily changes the blocked signal mask to the set to which
49 and then waits for a signal to arrive;
50 on return the previous set of masked signals is restored.
52 is usually empty to indicate that all
53 signals are to be unblocked for the duration of the call.
55 In normal usage, a signal is blocked using
57 to begin a critical section, variables modified on the occurrence
58 of the signal are examined to determine that there is no work
59 to be done, and the process pauses awaiting work by using
61 with the previous mask returned by
67 always terminates by being interrupted, returning -1 with
78 function call is expected to conform to