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>
diff --git a/fs/proc/internal.h b/fs/proc/internal.h
index 3ab6d14..ee04619 100644
--- a/fs/proc/internal.h
+++ b/fs/proc/internal.h
@@ -234,6 +234,12 @@
extern int proc_setup_self(struct super_block *);
/*
+ * proc_thread_self.c
+ */
+extern int proc_setup_thread_self(struct super_block *);
+extern void proc_thread_self_init(void);
+
+/*
* proc_sysctl.c
*/
#ifdef CONFIG_PROC_SYSCTL