api for generating the list of variables of given controller

api for generating the list of variables of given controller:
changelog - v2:
fixed the space on the end of lines

  * int cgroup_get_value_name_count(struct cgroup_controller,  *controller)
  functions return the number of variables in "controller"

  * char *cgroup_get_value_name(struct cgroup_controller *controller, int index)
  function return the "index" variable of "controller"

Signed-off-by: Ivana Hutarova Varekova <varekova@redhat.com>
Signed-off-by: Balbir Singh <balbir@linux.vnet.ibm.com>

3 files changed, 42 insertions, 0 deletions

diff --git a/include/libcgroup.h b/include/libcgroup.h
index d54d9c6..ce75d2e 100644
--- a/include/libcgroup.h
+++ b/include/libcgroup.h
@@ -469,6 +469,22 @@ int cgroup_set_value_bool(struct cgroup_controller *controller,
 						const char *name, bool value);
 struct cgroup_controller *cgroup_get_controller(struct cgroup *cgroup,
 							const char *name);
+
+/**
+ * Return the number of variables for the specified controller, if the
+ * structure does not exist -1 is returned
+ * @param controller Name of the controller for which stats are requested.
+ */
+int cgroup_get_value_name_count(struct cgroup_controller *controller);
+
+/**
+ * Return the "index" variable for the specified controller,
+ * the return value is the pointer to the internal structure so
+ * don't dealocate it, or change the content of the memory space.
+ * @param controller Name of the controller for which stats are requested.
+ * @param index number of the variable.
+ */
+char *cgroup_get_value_name(struct cgroup_controller *controller, int index);
 /*
  * Config related stuff
  */
diff --git a/src/libcgroup.map b/src/libcgroup.map
index 87d8a51..06c5e07 100644
--- a/src/libcgroup.map
+++ b/src/libcgroup.map
@@ -82,4 +82,6 @@ global:
 	cgroup_get_all_controller_begin;
 	cgroup_get_all_controller_next;
 	cgroup_get_all_controller_end;
+	cgroup_get_value_name_count;
+	cgroup_get_value_name;
 } CGROUP_0.34;
diff --git a/src/wrapper.c b/src/wrapper.c
index c82ffbf..53d70a9 100644
--- a/src/wrapper.c
+++ b/src/wrapper.c
@@ -612,3 +612,27 @@ scgroup_err:
 	cgroup_free(&src_cgroup);
 	return NULL;
 }
+
+int cgroup_get_value_name_count(struct cgroup_controller *controller)
+{
+	int ret;
+
+	if (!controller)
+		return -1;
+
+	return controller->index;
+}
+
+
+char *cgroup_get_value_name(struct cgroup_controller *controller, int index)
+{
+
+	if (!controller)
+		return NULL;
+
+	if (index < controller->index)
+		return (controller->values[index])->name;
+	else
+		return NULL;
+}
+