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sub-process API
===============
 
The sub-process API makes it possible to run background sub-processes
for the entire lifetime of a Git invocation. If Git needs to communicate
with an external process multiple times, then this can reduces the process
invocation overhead. Git and the sub-process communicate through stdin and
stdout.
 
The sub-processes are kept in a hashmap by command name and looked up
via the subprocess_find_entry function.  If an existing instance can not
be found then a new process should be created and started.  When the
parent git command terminates, all sub-processes are also terminated.
 
This API is based on the run-command API.
 
Data structures
---------------
 
* `struct subprocess_entry`
 
The sub-process structure.  Members should not be accessed directly.
 
Types
-----
 
'int(*subprocess_start_fn)(struct subprocess_entry *entry)'::
 
	User-supplied function to initialize the sub-process.  This is
	typically used to negotiate the interface version and capabilities.
 
 
Functions
---------
 
`cmd2process_cmp`::
 
	Function to test two subprocess hashmap entries for equality.
 
`subprocess_start`::
 
	Start a subprocess and add it to the subprocess hashmap.
 
`subprocess_stop`::
 
	Kill a subprocess and remove it from the subprocess hashmap.
 
`subprocess_find_entry`::
 
	Find a subprocess in the subprocess hashmap.
 
`subprocess_get_child_process`::
 
	Get the underlying `struct child_process` from a subprocess.
 
`subprocess_read_status`::
 
	Helper function to read packets looking for the last "status=<foo>"
	key/value pair.