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OpenDarwin 7.2.1 - man page for sigsuspend (opendarwin section 2)

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SIGSUSPEND(2)			     BSD System Calls Manual			    SIGSUSPEND(2)

NAME
     sigsuspend -- atomically release blocked signals and wait for interrupt

SYNOPSIS
     #include <signal.h>

     int
     sigsuspend(const sigset_t *sigmask);

DESCRIPTION
     Sigsuspend() temporarily changes the blocked signal mask to the set to which sigmask 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 sigprocmask(2) to begin a critical section, vari-
     ables 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 sigsuspend() with the previ-
     ous mask returned by sigprocmask.

RETURN VALUES
     The sigsuspend() function always terminates by being interrupted, returning -1 with errno
     set to EINTR.

SEE ALSO
     sigprocmask(2), sigaction(2), sigsetops(3)

STANDARDS
     The sigsupend function call conforms to IEEE Std 1003.1-1988 (``POSIX.1'').

BSD					   June 4, 1993 				      BSD
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