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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, variables modi-fied modified
fied 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 previous mask returned by sigprocmask.
RETURN VALUES
The sigsuspend() function always terminates by being interrupted, returning -1 with errno set to EINTR.
SEE ALSO
sigaction(2), sigprocmask(2), sigsetops(3)
STANDARDS
The sigsuspend function call conforms to IEEE Std 1003.1-1988 (``POSIX.1'').
BSD June 4, 1993 BSD
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