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    Command:

    sigwait

    
    
    
    

    SYNOPSIS

         #include <signal.h>
    
         int
         sigwait(const sigset_t * restrict set, int * restrict sig);
    
    
    

    DESCRIPTION

         The sigwait() system call selects a set of signals, specified by set.  If
         none of the selected signals are pending, sigwait() waits until one or
         more of the selected signals has been generated.  Then sigwait() atomi-
         cally clears one of the selected signals from the set of pending signals
         for the process and sets the location pointed to by sig to the signal
         number that was cleared.
    
         The signals specified by set should be blocked at the time of the call to
         sigwait().
    
         If more than one thread is using sigwait() to wait for the same signal,
         no more than one of these threads will return from sigwait() with the
         signal number.  If more than a single thread is blocked in sigwait() for
         a signal when that signal is generated for the process, it is unspecified
         which of the waiting threads returns from sigwait().  If the signal is
         generated for a specific thread, as by pthread_kill(), only that thread
         will return.
    
         Should any of the multiple pending signals in the range SIGRTMIN to
         SIGRTMAX be selected, it will be the lowest numbered one.  The selection
         order between realtime and non-realtime signals, or between multiple
         pending non-realtime signals, is unspecified.
    
    
    

    RETURN VALUES

         If successful, sigwait() returns 0 and sets the location pointed to by
         sig to the cleared signal number.  Otherwise, an error number is
         returned.
    
    
    

    ERRORS

         The sigwait() system call will fail if:
    
         [EINVAL]           The set argument specifies one or more invalid signal
                            numbers.
    
         [EFAULT]           Any arguments point outside the allocated address
                            space or there is a memory protection fault.
    
    
    

    SEE ALSO

         sigaction(2), sigpending(2), sigqueue(2), sigsuspend(2), sigtimedwait(2),
         sigwaitinfo(2), pause(3), pthread_sigmask(3)
    
    
    

    STANDARDS

         The sigwait() function conforms to ISO/IEC 9945-1:1996 ("POSIX.1").
    
    
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