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.
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.