sigblock(3BSD)       (BSD System Compatibility)       sigblock(3BSD)


       NAME
             sigblock, sigmask - (BSD) block signals

       SYNOPSIS
             /usr/ucb/cc [flag . . . ] file . . .
             #include <signal.h>
             sigblock(int mask);
             #define sigmask(signum)

       DESCRIPTION
             sigblock adds the signals specified in mask to the set of
             signals currently being blocked from delivery.  Signals are
             blocked if the appropriate bit in mask is a 1; the macro
             sigmask is provided to construct the mask for a given signum.
             The previous mask is returned, and may be restored using
             sigsetmask(3BSD).

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

       RETURN VALUE
             The previous set of masked signals is returned.

       REFERENCES
             kill(2), sigaction(2), signal(2), sigsetmask(3BSD),
             sigvec(3BSD)






















                           Copyright 1994 Novell, Inc.               Page 1