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NAME    [Toc]    [Back]

     sigblock - block signals

SYNOPSIS    [Toc]    [Back]

     #include <signal.h>

     sigblock(int mask);

     sigmask(int 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.

EXAMPLES    [Toc]    [Back]

     The following example utilizing sigblock():

           int omask;

           omask = sigblock(sigmask(SIGINT) | sigmask(SIGHUP));


           sigset_t set, oset;

           sigaddset(&set, SIGINT);
           sigaddset(&set, SIGHUP);
           sigprocmask(SIG_BLOCK, &set, &oset);

     Another use of sigblock() is  to  get  the  current  set  of
masked signals
     without changing what is actually blocked.  Instead of:

           int set;

           set = sigblock(0);

     Use the following:

           sigset_t set;

           sigprocmask(SIG_BLOCK, NULL, &set);

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

OpenBSD      3.6                          March      10,     1991
[ Back ]
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