NAME    [Toc]    [Back]

     sigblock - block signals

LIBRARY    [Toc]    [Back]

     Standard C Library (libc, -lc)

SYNOPSIS    [Toc]    [Back]

     #include <signal.h>

     int
     sigblock(int mask);

     int
     sigmask(signum);

DESCRIPTION    [Toc]    [Back]

     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    [Toc]    [Back]

     The previous set of masked signals is returned.

SEE ALSO    [Toc]    [Back]

     kill(2), sigaction(2), sigprocmask(2), sigsetmask(3), sigsetops(3)

HISTORY    [Toc]    [Back]

     The sigblock() function call appeared in 4.2BSD and has been deprecated.

BSD                              June 2, 1993                              BSD