Merge "libprocessgroup: new method to get cgroup paths"

libprocessgroup/include/processgroup/processgroup.h

@@ -36,7 +36,8 @@ bool SetProcessProfiles(uid_t uid, pid_t pid, const std::vector<std::string>& pr
 
 static constexpr const char* CGROUPS_RC_PATH = "/dev/cgroup_info/cgroup.rc";
 // Path to test against for freezer support
-// TODO: remove and replace with a function call, see http://b/180056337
+// TODO: remove it once https://r.android.com/1607196 is properly merged to all branches,
+// see http://b/180056337
 static constexpr const char* CGROUP_FREEZE_PATH = "/sys/fs/cgroup/uid_0/cgroup.freeze";
 
 bool UsePerAppMemcg();
@@ -68,6 +69,10 @@ bool setProcessGroupLimit(uid_t uid, int initialPid, int64_t limitInBytes);
 
 void removeAllProcessGroups(void);
 
+// Provides the path for an attribute in a specific process group
+// Returns false in case of error, true in case of success
+bool getAttributePathForTask(const std::string& attr_name, int tid, std::string* path);
+
 #endif // __ANDROID_VNDK__
 
 __END_DECLS

libprocessgroup/processgroup.cpp

@@ -508,3 +508,7 @@ bool setProcessGroupSoftLimit(uid_t, int pid, int64_t soft_limit_in_bytes) {
 bool setProcessGroupLimit(uid_t, int pid, int64_t limit_in_bytes) {
     return SetProcessGroupValue(pid, "MemLimit", limit_in_bytes);
 }
+
+bool getAttributePathForTask(const std::string& attr_name, int tid, std::string* path) {
+    return CgroupGetAttributePathForTask(attr_name, tid, path);
+}

libprocessgroup/profiles/cgroups.json

@@ -37,7 +37,7 @@
     "Controllers": [
       {
         "Controller": "freezer",
-        "Path": "freezer",
+        "Path": ".",
         "Mode": "0755",
         "UID": "system",
         "GID": "system"