sigblock(2) BSD System Calls Manual sigblock(2)
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.
SEE ALSO
kill(2), sigaction(2), sigprocmask(2), sigsetmask(2), sigsetops(3)
HISTORY
The sigblock() function call appeared in 4.2BSD and has been deprecated.
BSD June 2, 1993 BSD
Mac OS X 10.8 - Generated Sat Aug 25 07:09:46 CDT 2012