This commit adds cgroup_get_controller_version() which returns
which version (cgroup v1 or cgroup v2) of a controller is mounted.
Signed-off-by: Tom Hromatka <tom.hroma...@oracle.com>
---
src/api.c | 19 +++++++++++++++++++
src/libcgroup-internal.h | 10 ++++++++++
2 files changed, 29 insertions(+)
diff --git a/src/api.c b/src/api.c
index b786dc614005..c4870046e8c2 100644
--- a/src/api.c
+++ b/src/api.c
@@ -5306,4 +5306,23 @@ int cgroup_get_subsys_mount_point_end(void **handle)
return 0;
}
+int cgroup_get_controller_version(const char * const controller,
+ enum cg_version_t * const version)
+{
+ int i;
+
+ if (!version)
+ return ECGINVAL;
+
+ *version = CGROUP_UNK;
+
+ for (i = 0; cg_mount_table[i].name[0] != '\0'; i++) {
+ if (strncmp(cg_mount_table[i].name, controller,
+ sizeof(cg_mount_table[i].name)) == 0) {
+ *version = cg_mount_table[i].version;
+ return 0;
+ }
+ }
+ return ECGROUPNOTEXIST;
+}
diff --git a/src/libcgroup-internal.h b/src/libcgroup-internal.h
index 8c6b36c29966..57c870a8c41f 100644
--- a/src/libcgroup-internal.h
+++ b/src/libcgroup-internal.h
@@ -114,6 +114,7 @@ struct cg_mount_point {
};
enum cg_version_t {
+ CGROUP_UNK = 0,
CGROUP_V1,
CGROUP_V2,
};
@@ -297,6 +298,15 @@ extern void cgroup_dictionary_iterator_end(void **handle);
*/
int cg_chmod_path(const char *path, mode_t mode, int owner_is_umask);
+/**
+ * Get the cgroup version of a controller. Version is set to CGROUP_UNK
+ * if the version cannot be determined.
+ *
+ * @param controller The controller of interest
+ * @param version The version of the controller
+ */
+int cgroup_get_controller_version(const char * const controller,
+ enum cg_version_t * const version);
/**
* Functions that are defined as STATIC can be placed within the UNIT_TEST
* ifdef. This will allow them to be included in the unit tests while
--
2.25.3
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