Problem with fork

[Arief]

Hi all,

There is something I don't understand. I've create simple program below in
my Linux:

#### START OF PROGRAM ####
#!/usr/bin/python

#
# MAIN PROGRAM
#

import os, sys, time

if os.fork(): sys.exit()
os.setsid()

for child in range(10):
        time.sleep(1)

        print 'Parent fork'
        if not os.fork():
                # Child process
                print 'Child start:', child
                time.sleep(child)
                print 'Child exit:', child
                sys.exit()
print 'Parent exit'
#### END OF PROGRAM ####

Parent creates 10 childs in sequence by fork. It works ...
But, everytime the child process exits, it leaves <defunct> in my process
status.

Can anyone help me with the solution?

Thanks,
-----
Arief