sigblock(3)             (BSD Compatibility Package)             sigblock(3)

NAME
     sigblock, sigmask - block signals

SYNOPSIS
     /usr/ucb/cc [flag ...] file ... -lucb

     #include <signal.h>

     sigblock(mask)
     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 con-
     struct the mask for a given signum. The previous mask is returned, and
     may be restored using sigsetmask.

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

RETURN VALUE
     The previous set of masked signals is returned.

SEE ALSO
     kill(2), sigaction(2), signal(2), sigsetmask(3), sigvec(3),
     signal(3-ucb), signal(5).


























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