sigblock man page on Minix

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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 cur‐
     rently being blocked from delivery.  Signals are blocked if the corre‐
     sponding 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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