From 647274d80d18686a3129a2b50605869ac5178ccf Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Nikola=20Forr=C3=B3?= <nforro@redhat.com>
Date: Tue, 8 Dec 2015 17:09:08 +0100
Subject: [PATCH 1/6] api.c: change cgroup of every thread of a process

When changing cgroup of multi-threaded process, only the main threads
cgroup actually changed. Now all threads of a process are enumerated
and cgroup is changed for each of them.
---
 src/api.c | 26 +++++++++++++++++++++-----
 1 file changed, 21 insertions(+), 5 deletions(-)

diff --git a/src/api.c b/src/api.c
index 0cc15c6..df90a6f 100644
--- a/src/api.c
+++ b/src/api.c
@@ -3177,10 +3177,13 @@ int cgroup_change_all_cgroups(void)
 		return -ECGOTHER;
 
 	while ((pid_dir = readdir(dir)) != NULL) {
-		int err, pid;
+		int err, pid, tid;
 		uid_t euid;
 		gid_t egid;
 		char *procname = NULL;
+		DIR *tdir;
+		struct dirent *tid_dir = NULL;
+		char tpath[FILENAME_MAX] = { '\0' };
 
 		err = sscanf(pid_dir->d_name, "%i", &pid);
 		if (err < 1)
@@ -3194,11 +3197,24 @@ int cgroup_change_all_cgroups(void)
 		if (err)
 			continue;
 
-		err = cgroup_change_cgroup_flags(euid,
-				egid, procname, pid, CGFLAG_USECACHE);
-		if (err)
-			cgroup_dbg("cgroup change pid %i failed\n", pid);
+		snprintf(tpath, FILENAME_MAX, "%s%d/task/", path, pid);
+
+		tdir = opendir(tpath);
+		if (!tdir)
+			continue;
+
+		while ((tid_dir = readdir(tdir)) != NULL) {
+			err = sscanf(tid_dir->d_name, "%i", &tid);
+			if (err < 1)
+				continue;
+
+			err = cgroup_change_cgroup_flags(euid,
+					egid, procname, tid, CGFLAG_USECACHE);
+			if (err)
+				cgroup_dbg("cgroup change tid %i failed\n", tid);
+		}
 
+		closedir(tdir);
 		free(procname);
 	}
 
-- 
2.17.0