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SIGSUSPEND(2) BSD System Calls Manual SIGSUSPEND(2)
sigsuspend -- atomically release blocked signals and wait for interrupt
sigsuspend(const sigset_t *sigmask);
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.
The sigsuspend() function always terminates by being interrupted, returning -1 with errno
set to EINTR.
sigprocmask(2), sigaction(2), sigsetops(3)
The sigsupend function call conforms to IEEE Std 1003.1-1988 (``POSIX.1'').
BSD June 4, 1993 BSD
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