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-rw-r--r--src/basic/cgroup-util.c47
-rw-r--r--src/basic/cgroup-util.h2
-rw-r--r--src/basic/missing.h4
3 files changed, 43 insertions, 10 deletions
diff --git a/src/basic/cgroup-util.c b/src/basic/cgroup-util.c
index 56c1fcaab9..5043180747 100644
--- a/src/basic/cgroup-util.c
+++ b/src/basic/cgroup-util.c
@@ -101,6 +101,39 @@ int cg_read_pid(FILE *f, pid_t *_pid) {
return 1;
}
+int cg_read_event(const char *controller, const char *path, const char *event,
+ char **val)
+{
+ _cleanup_free_ char *events = NULL, *content = NULL;
+ char *p, *line;
+ int r;
+
+ r = cg_get_path(controller, path, "cgroup.events", &events);
+ if (r < 0)
+ return r;
+
+ r = read_full_file(events, &content, NULL);
+ if (r < 0)
+ return r;
+
+ p = content;
+ while ((line = strsep(&p, "\n"))) {
+ char *key;
+
+ key = strsep(&line, " ");
+ if (!key || !line)
+ return -EINVAL;
+
+ if (strcmp(key, event))
+ continue;
+
+ *val = strdup(line);
+ return 0;
+ }
+
+ return -ENOENT;
+}
+
int cg_enumerate_subgroups(const char *controller, const char *path, DIR **_d) {
_cleanup_free_ char *fs = NULL;
int r;
@@ -1007,18 +1040,12 @@ int cg_is_empty_recursive(const char *controller, const char *path) {
return unified;
if (unified > 0) {
- _cleanup_free_ char *populated = NULL, *t = NULL;
+ _cleanup_free_ char *t = NULL;
/* On the unified hierarchy we can check empty state
- * via the "cgroup.populated" attribute. */
+ * via the "populated" attribute of "cgroup.events". */
- r = cg_get_path(controller, path, "cgroup.populated", &populated);
- if (r < 0)
- return r;
-
- r = read_one_line_file(populated, &t);
- if (r == -ENOENT)
- return 1;
+ r = cg_read_event(controller, path, "populated", &t);
if (r < 0)
return r;
@@ -2129,7 +2156,7 @@ int cg_unified(void) {
if (statfs("/sys/fs/cgroup/", &fs) < 0)
return -errno;
- if (F_TYPE_EQUAL(fs.f_type, CGROUP_SUPER_MAGIC))
+ if (F_TYPE_EQUAL(fs.f_type, CGROUP2_SUPER_MAGIC))
unified_cache = true;
else if (F_TYPE_EQUAL(fs.f_type, TMPFS_MAGIC))
unified_cache = false;
diff --git a/src/basic/cgroup-util.h b/src/basic/cgroup-util.h
index ad1edd9cdb..4254e51e5d 100644
--- a/src/basic/cgroup-util.h
+++ b/src/basic/cgroup-util.h
@@ -96,6 +96,8 @@ static inline bool CGROUP_BLKIO_WEIGHT_IS_OK(uint64_t x) {
int cg_enumerate_processes(const char *controller, const char *path, FILE **_f);
int cg_read_pid(FILE *f, pid_t *_pid);
+int cg_read_event(const char *controller, const char *path, const char *event,
+ char **val);
int cg_enumerate_subgroups(const char *controller, const char *path, DIR **_d);
int cg_read_subgroup(DIR *d, char **fn);
diff --git a/src/basic/missing.h b/src/basic/missing.h
index 034e334e66..66cd5921ad 100644
--- a/src/basic/missing.h
+++ b/src/basic/missing.h
@@ -437,6 +437,10 @@ struct btrfs_ioctl_quota_ctl_args {
#define CGROUP_SUPER_MAGIC 0x27e0eb
#endif
+#ifndef CGROUP2_SUPER_MAGIC
+#define CGROUP2_SUPER_MAGIC 0x63677270
+#endif
+
#ifndef TMPFS_MAGIC
#define TMPFS_MAGIC 0x01021994
#endif