The following is a demonstration of the mkzombie command,


Here we run mkzombie with no options, and check the processes created,

   $  ./mkzombie
   [1]   Stopped                 ./mkzombie
   $ ptree $$
   402   /usr/dt/bin/dtlogin -daemon
     461   /usr/dt/bin/dtlogin -daemon
       488   /bin/ksh /usr/dt/bin/Xsession
         558   /usr/dt/bin/sdt_shell -c       unset DT;      DISPLAY=:0;       
           561   -bash -c       unset DT;      DISPLAY=:0;        /usr/dt/bin/d
             574   /usr/dt/bin/dtsession
               584   /usr/dt/bin/dtterm -session dthiaONe
                 598   /bin/bash
                   15901 ./mkzombie
                     15902 <defunct>
                   15903 ptree 598

A zombie has been created with PID 15902, with a deamon leader at 15901.



Here we create ten zombies,

   $ ./mkzombie 10
   [1]+  Stopped                 ./mkzombie 10
   $ ptree $$
   402   /usr/dt/bin/dtlogin -daemon
     461   /usr/dt/bin/dtlogin -daemon
       488   /bin/ksh /usr/dt/bin/Xsession
         558   /usr/dt/bin/sdt_shell -c       unset DT;      DISPLAY=:0;       
           561   -bash -c       unset DT;      DISPLAY=:0;        /usr/dt/bin/d
             574   /usr/dt/bin/dtsession
               584   /usr/dt/bin/dtterm -session dthiaONe
                 598   /bin/bash
                   15904 ./mkzombie 10
                     15914 <defunct>
                     15913 <defunct>
                     15912 <defunct>
                     15911 <defunct>
                     15910 <defunct>
                     15909 <defunct>
                     15908 <defunct>
                     15907 <defunct>
                     15906 <defunct>
                     15905 <defunct>
                   15915 ptree 598



In the following example, we use the -f option to feed the zombies to the
init monster.

   $ ./mkzombie -f 20
   Killed
   $ ptree $$
   402   /usr/dt/bin/dtlogin -daemon
     461   /usr/dt/bin/dtlogin -daemon
       488   /bin/ksh /usr/dt/bin/Xsession
         558   /usr/dt/bin/sdt_shell -c       unset DT;      DISPLAY=:0;       
           561   -bash -c       unset DT;      DISPLAY=:0;        /usr/dt/bin/d
             574   /usr/dt/bin/dtsession
               584   /usr/dt/bin/dtterm -session dthiaONe
                 598   /bin/bash
                   15960 ptree 598

All twenty zombies have dissapeared - the init monster has gobbled them up.
It must have been pretty hungry.