Parent is 5323
reading kid...
parent 5323 timeout=60 read_from_child=0 - child_pid=0
child 5324 is running
parent 5323 timeout=59 read_from_child=1 - child_pid=0
parent 5323 just read: 5324
parent 5323 timeout=59 read_from_child=0 - child_pid=5324
parent 5323 timeout=58 read_from_child=0 - child_pid=5324
parent 5323 timeout=57 read_from_child=0 - child_pid=5324
parent 5323 timeout=56 read_from_child=0 - child_pid=5324
returncode is 0
parent 5323 timeout=55 read_from_child=1 - child_pid=5324
parent 5323 just read: returncode is 0
parent 5323 timeout=55 read_from_child=0 - child_pid=5324
dead child

Child 5324 is done, we now have:
returncode is 0