cgroup-util: introduce cg_pidref_get_unit

diff --git a/src/basic/cgroup-util.c b/src/basic/cgroup-util.c
index 4c82552904243f9825cd4c639fc9cb24ff05c2bd..18b16ecc0e5c5786024568b9c11a2859f9aee547 100644 (file)
--- a/src/basic/cgroup-util.c
+++ b/src/basic/cgroup-util.c
@@ -1262,6 +1262,27 @@ int cg_pid_get_unit(pid_t pid, char **ret_unit) {
         return cg_path_get_unit(cgroup, ret_unit);
 }
 
+int cg_pidref_get_unit(const PidRef *pidref, char **ret) {
+        _cleanup_free_ char *unit = NULL;
+        int r;
+
+        assert(ret);
+
+        if (!pidref_is_set(pidref))
+                return -ESRCH;
+
+        r = cg_pid_get_unit(pidref->pid, &unit);
+        if (r < 0)
+                return r;
+
+        r = pidref_verify(pidref);
+        if (r < 0)
+                return r;
+
+        *ret = TAKE_PTR(unit);
+        return 0;
+}
+
 /**
  * Skip session-*.scope, but require it to be there.
  */

diff --git a/src/basic/cgroup-util.h b/src/basic/cgroup-util.h
index bfb383052079860f1f0141805e0938a2d4a9719d..6ab14c753d5f730720a321761fcb2b6051028fc8 100644 (file)
--- a/src/basic/cgroup-util.h
+++ b/src/basic/cgroup-util.h
@@ -279,6 +279,7 @@ int cg_pid_get_path_shifted(pid_t pid, const char *cached_root, char **ret_cgrou
 int cg_pid_get_session(pid_t pid, char **ret_session);
 int cg_pid_get_owner_uid(pid_t pid, uid_t *ret_uid);
 int cg_pid_get_unit(pid_t pid, char **ret_unit);
+int cg_pidref_get_unit(const PidRef *pidref, char **ret);
 int cg_pid_get_user_unit(pid_t pid, char **ret_unit);
 int cg_pid_get_machine_name(pid_t pid, char **ret_machine);
 int cg_pid_get_slice(pid_t pid, char **ret_slice);