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NetBSD 6.1.5 - man page for sigblock (netbsd section 3)

SIGBLOCK(3)			   BSD Library Functions Manual 		      SIGBLOCK(3)

NAME
     sigblock -- block signals

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <signal.h>

     int
     sigblock(int mask);

     int
     sigmask(signum);

DESCRIPTION
     This interface is made obsolete by: sigprocmask(2).

     sigblock() adds the signals specified in mask to the set of signals currently being 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.

     It is not possible to block SIGKILL or SIGSTOP; this restriction is silently imposed by the
     system.

RETURN VALUES
     The previous set of masked signals is returned.

EXAMPLES
     The following example using sigblock():

	   int omask;

	   omask = sigblock(sigmask(SIGINT) | sigmask(SIGHUP));

     Becomes:

	   sigset_t set, oset;

	   sigemptyset(&set);
	   sigaddset(&set, SIGINT);
	   sigaddset(&set, SIGHUP);
	   sigprocmask(SIG_BLOCK, &set, &oset);

     Another use of sigblock() is to get the current set of masked signals without changing what
     is actually blocked.  Instead of:

	   int set;

	   set = sigblock(0);

     Use the following:

	   sigset_t set;

	   sigprocmask(SIG_BLOCK, NULL, &set);

SEE ALSO
     kill(2), sigaction(2), sigprocmask(2), sigsetmask(3), sigsetops(3)

HISTORY
     The sigblock() function call appeared in 4.2BSD and has been deprecated.

BSD					 August 10, 2002				      BSD


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