set_child_setup

Sets up a child setup function.

The child setup function will be called after fork but before exec on the child's side.

destroy_notify will not be automatically called on the child's side of the fork. It will only be called when the last reference on the SubprocessLauncher is dropped or when a new child setup function is given.

null can be given as child_setup to disable the functionality.

Child setup functions are only available on UNIX.

Parameters:

this	a SubprocessLauncher
child_setup	a SpawnChildSetupFunc to use as the child setup function
destroy_notify	a DestroyNotify for user_data
user_data	user data for child_setup