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authorEric W. Biederman <ebiederm@xmission.com>2014-07-31 03:10:50 -0700
committerEric W. Biederman <ebiederm@xmission.com>2014-08-04 10:07:11 -0700
commit0097875bd41528922fb3bb5f348c53f17e00e2fd (patch)
tree414cffac820d04e4542dc7654e7ef188f00ba0b2 /fs/proc/root.c
parent6ba8ed79a3cce14bd5597218fd46408b8376f8f3 (diff)
proc: Implement /proc/thread-self to point at the directory of the current thread
/proc/thread-self is derived from /proc/self. /proc/thread-self points to the directory in proc containing information about the current thread. This funtionality has been missing for a long time, and is tricky to implement in userspace as gettid() is not exported by glibc. More importantly this allows fixing defects in /proc/mounts and /proc/net where in a threaded application today they wind up being empty files when only the initial pthread has exited, causing problems for other threads. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'fs/proc/root.c')
-rw-r--r--fs/proc/root.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/proc/root.c b/fs/proc/root.c
index 5dbadecb234d..48f1c03bc7ed 100644
--- a/fs/proc/root.c
+++ b/fs/proc/root.c
@@ -149,6 +149,8 @@ static void proc_kill_sb(struct super_block *sb)
ns = (struct pid_namespace *)sb->s_fs_info;
if (ns->proc_self)
dput(ns->proc_self);
+ if (ns->proc_thread_self)
+ dput(ns->proc_thread_self);
kill_anon_super(sb);
put_pid_ns(ns);
}
@@ -170,6 +172,7 @@ void __init proc_root_init(void)
return;
proc_self_init();
+ proc_thread_self_init();
proc_symlink("mounts", NULL, "self/mounts");
proc_net_init();