windows - How to kill a process opened with open () -

i trying kill process opened in background in perl on win32 (xp) tried several things.... not seems working....

$pid = open( cmd, "| cmd.exe > c:\\cmdout.txt" ); 

to kill background process tried several things....:(

1. system('taskkill /f /im cmd.exe');

2. system("taskkill /f /pid $pid");

3. close cmd || warn "cmd exited $?";

option 2 never works tried print values of pid print , actual in system different. option 1 works feel process still running in ground because after end process wait time , re start process...

please

-thanks

i played bit case. apparently 2 cmd.exe started, parent pid returned open , child doing commands.

second scenario partially works, kills parent, child remain running. using /t option taskkill can force kill children:

system("taskkill /f /t /pid $pid"); 

you see message termination of both processes:

success: process pid 3956 child of pid 1864 has been terminated. success: process pid 1864 child of pid 580 has been terminated. 

third scenario seems work fine me. closing filehandle makes both cmd processes die.