cgroup_add_all_controllers function attach all mounted controllers to a given
cgroup. This function just modifies internal libcgroup structure, not the
kernel control group.
input parameter: cgroup
output parameter: zero or error number
Signed-off-by: Ivana Hutarova Varekova <varek...@redhat.com>
---
include/libcgroup/groups.h | 10 +++++++++
src/libcgroup.map | 7 ++++++
src/wrapper.c | 50 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 67 insertions(+)
diff --git a/include/libcgroup/groups.h b/include/libcgroup/groups.h
index d5c87aa..201558f 100644
--- a/include/libcgroup/groups.h
+++ b/include/libcgroup/groups.h
@@ -150,6 +150,16 @@ struct cgroup_controller *cgroup_add_controller(struct
cgroup *cgroup,
const char *name);
/**
+ * Attach all mounted controllers to given cgroup. This function just modifies
+ * internal libcgroup structure, not the kernel control group.
+ *
+ * @param cgroup
+ * @return zero or error number
+ */
+int cgroup_add_all_controllers(struct cgroup *cgroup);
+
+
+/**
* Return appropriate controller from given group.
* The controller must be added before using cgroup_add_controller() or loaded
* from kernel using cgroup_get_cgroup().
diff --git a/src/libcgroup.map b/src/libcgroup.map
index f8b0fb9..8fe1990 100644
--- a/src/libcgroup.map
+++ b/src/libcgroup.map
@@ -122,3 +122,10 @@ CGROUP_0.40 {
cgroup_templates_cache_set_source_files;
cgroup_load_templates_cache_from_files;
} CGROUP_0.39;
+
+CGROUP_0.41 {
+} CGROUP_0.40;
+
+CGROUP_0.42 {
+ cgroup_add_all_controllers;
+} CGROUP_0.41;
diff --git a/src/wrapper.c b/src/wrapper.c
index c03472a..3a9331f 100644
--- a/src/wrapper.c
+++ b/src/wrapper.c
@@ -92,6 +92,56 @@ struct cgroup_controller *cgroup_add_controller(struct
cgroup *cgroup,
return controller;
}
+int cgroup_add_all_controllers(struct cgroup *cgroup)
+{
+ int ret;
+ void *handle;
+ struct controller_data info;
+ struct cgroup_controller *cgc;
+
+ /* go through the controller list */
+ ret = cgroup_get_all_controller_begin(&handle, &info);
+ if ((ret != 0) && (ret != ECGEOF)) {
+ fprintf(stderr, "cannot read controller data: %s\n",
+ cgroup_strerror(ret));
+ return ret;
+ }
+
+ while (ret == 0) {
+ if (info.hierarchy == 0) {
+ /* the controller is not attached to any hierarchy
+ skip it */
+ goto next;
+ }
+
+ /* add mounted controller to cgroup structure */
+ cgc = cgroup_add_controller(cgroup, info.name);
+ if (!cgc) {
+ ret = ECGINVAL;
+ fprintf(stderr, "controller %s can't be add\n",
+ info.name);
+ }
+
+next:
+ ret = cgroup_get_all_controller_next(&handle, &info);
+ if (ret && ret != ECGEOF)
+ goto end;
+ }
+
+end:
+ cgroup_get_all_controller_end(&handle);
+
+ if (ret == ECGEOF)
+ ret = 0;
+
+ if (ret)
+ fprintf(stderr,
+ "cgroup_get_controller_begin/next failed (%s)\n",
+ cgroup_strerror(ret));
+
+ return ret;
+}
+
void cgroup_free_controllers(struct cgroup *cgroup)
{
int i, j;
------------------------------------------------------------------------------
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