[PATCH v2 2/3] run-command: export child_process_clear()

["René Scharfe" <l.s.r@web.de>]

Make the API symmetric by including a cleanup function as a counterpart
to child_process_init().

Signed-off-by: Rene Scharfe <l.s.r@web.de>
---
 Documentation/technical/api-run-command.txt | 7 +++++++
 run-command.c                               | 2 +-
 run-command.h                               | 1 +
 3 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/Documentation/technical/api-run-command.txt b/Documentation/technical/api-run-command.txt
index a9fdb45..8bf3e37 100644
--- a/Documentation/technical/api-run-command.txt
+++ b/Documentation/technical/api-run-command.txt
@@ -46,6 +46,13 @@ Functions
 	The argument dir corresponds the member .dir. The argument env
 	corresponds to the member .env.
 
+`child_process_clear`::
+
+	Release the memory associated with the struct child_process.
+	Most users of the run-command API don't need to call this
+	function explicitly because `start_command` invokes it on
+	failure and `finish_command` calls it automatically already.
+
 The functions above do the following:
 
 . If a system call failed, errno is set and -1 is returned. A diagnostic
diff --git a/run-command.c b/run-command.c
index b10ec75..0a3c24e 100644
--- a/run-command.c
+++ b/run-command.c
@@ -13,7 +13,7 @@ void child_process_init(struct child_process *child)
 	argv_array_init(&child->env_array);
 }
 
-static void child_process_clear(struct child_process *child)
+void child_process_clear(struct child_process *child)
 {
 	argv_array_clear(&child->args);
 	argv_array_clear(&child->env_array);
diff --git a/run-command.h b/run-command.h
index 9fe37ee..e296bd2 100644
--- a/run-command.h
+++ b/run-command.h
@@ -47,6 +47,7 @@ struct child_process {
 
 #define CHILD_PROCESS_INIT { NULL, ARGV_ARRAY_INIT, ARGV_ARRAY_INIT }
 void child_process_init(struct child_process *);
+void child_process_clear(struct child_process *);
 
 int start_command(struct child_process *);
 int finish_command(struct child_process *);
-- 
2.6.2