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    Command:

    sigmask

    
    
    
    

    SYNOPSIS

         #include <signal.h>
    
         int
         sigsetmask(int mask);
    
         int
         sigblock(int mask);
    
         int
         sigmask(int signum);
    
    
    

    DESCRIPTION

         This interface is made obsolete by: sigprocmask(2).
    
         The sigsetmask() function sets the current signal mask to the specified
         mask.  Signals are blocked from delivery if the corresponding bit in mask
         is a 1.  The sigblock() function adds the signals in the specified mask
         to the current signal mask, rather than overwriting it as sigsetmask()
         does.  The macro sigmask() is provided to construct the mask for a given
         signum.
    
         The system quietly disallows SIGKILL or SIGSTOP to be blocked.
    
    
    

    RETURN VALUES

         The sigblock() and sigsetmask() functions return the previous set of
         masked signals.
    
    
    

    SEE ALSO

         kill(2), sigaction(2), sigprocmask(2), sigsuspend(2), sigvec(2),
         sigsetops(3)
    
    
    

    HISTORY

         The sigsetmask() and sigblock() functions first appeared in 4.2BSD and
         have been deprecated.
    
    
    

    BSD June 2, 1993 BSD

    
    
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