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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.