NAME    [Toc]    [Back]

     sigsuspend - atomically release blocked signals and wait for
interrupt

SYNOPSIS    [Toc]    [Back]

     #include <signal.h>

     int
     sigsuspend(const sigset_t *sigmask);

DESCRIPTION    [Toc]    [Back]

     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 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 previous
mask returned
 by sigprocmask(2).

RETURN VALUES    [Toc]    [Back]

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

SEE ALSO    [Toc]    [Back]

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

STANDARDS    [Toc]    [Back]

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

OpenBSD      3.6                           June      4,      1993