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BSD 2.11 - man page for sigsetmask (bsd section 2)

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SIGSETMASK(2)									    SIGSETMASK(2)

NAME
       sigsetmask - set current signal mask

SYNOPSIS
       #include <signal.h>

       omask = sigsetmask(mask);
       long omask, mask;

       mask = sigmask(signum)
       long mask;
       int signum;

DESCRIPTION
       Sigsetmask  sets  the  current signal mask (those signals that are blocked from delivery).
       Signals are blocked if the corresponding bit in mask is a 1; the macro sigmask is provided
       to construct the mask for a given signum.

       The system quietly disallows SIGKILL, SIGSTOP, or SIGCONT to be blocked.

RETURN VALUE
       The previous set of masked signals is returned.

SEE ALSO
       kill(2), sigvec(2), sigblock(2), sigpause(2)

4.2 Berkeley Distribution		   May 14, 1986 			    SIGSETMASK(2)
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