SIGBLOCK(2)	    UNIX Programmer's Manual	      SIGBLOCK(2)


NAME
     sigblock - block signals

SYNOPSIS
     #include <signal.h>

     omask = sigblock(mask);
     long omask, mask;

     mask = sigmask(signum)
     long mask;
     int signum;

DESCRIPTION
     This interface is made obsolete by: sigprocmask(2).

     Sigblock causes the signals specified in mask to be added 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, SIGSTOP, or SIGCONT;
     this restriction is silently imposed by the system.

RETURN VALUE
     The previous set of masked signals is returned.

SEE ALSO
     kill(2), sigprocmask(2), sigaction(2), sigsetmask(2), sig-
     setops(2)

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


Printed 11/26/99	September 2, 1997			1


 
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