kill subprocess spawned by spawnProcess in twisted doesn't work

kill subprocess spawned by spawnProcess in twisted doesn't work

References

Reference NO 1

http://stackoverflow.com/questions/13586929/kill-subprocess-spawned-by-spawnprocess-in-twisted-doesnt-work

Reference NO 2

http://twistedmatrix.com/trac/ticket/2726

Reference NO 3

http://twistedmatrix.com/trac/ticket/5272

Reference NO 4

http://twistedmatrix.com/trac/ticket/4159

Reference NO 5

http://trac.buildbot.net/ticket/77

Reference NO 6

http://src.chromium.org/svn/trunk/tools/build/third_party/twisted_10_2/twisted/internet/test/test_process.py

Reference NO 7

http://stuff.mit.edu/afs/athena/system/amd64_deb50/os/usr/share/pyshared/twisted/internet/test/test_process.py

Reference NO 8

http://boldwyn-techaswere1.blogspot.com/2013/08/how-to-get-status-of-spawn-process.html