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SIGSETMASK(2)		  FreeBSD System Calls Manual		 SIGSETMASK(2)

NAME
     sigsetmask, sigblock -- manipulate	current	signal mask

LIBRARY
     Standard C	Library	(libc, -lc)

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.

FreeBSD	11.1			 June 2, 1993			  FreeBSD 11.1

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | SEE ALSO | HISTORY

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