linux-kernel - [patch 3/4] proc: Introduce the Children: line in /proc/<pid>/status

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Date:	Mon, 8 Aug 2011 01:20:31 +0400
From:	Cyrill Gorcunov <gorcunov@...nvz.org>
To:	Nathan Lynch <ntl@...ox.com>, Oren Laadan <orenl@...columbia.edu>,
	Daniel Lezcano <dlezcano@...ibm.com>,
	Serge Hallyn <serue@...ibm.com>, Tejun Heo <tj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Glauber Costa <glommer@...allels.com>, containers@...ts.osdl.org,
	linux-kernel@...r.kernel.org,
	Pavel Emelyanov <xemul@...allels.com>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>
Subject: [patch 3/4] proc: Introduce the Children: line in /proc/<pid>/status

From: Pavel Emelyanov <xemul@...allels.com>

Although we can get the pids of some task's issue, this is just 
more convenient to have them this way.

Signed-off-by: Pavel Emelyanov <xemul@...allels.com>
Acked-by: Serge Hallyn <serge.hallyn@...onical.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@...nvz.org>
---
 fs/proc/array.c |   14 ++++++++++++++
 1 file changed, 14 insertions(+)

Index: linux-2.6.git/fs/proc/array.c
===================================================================
--- linux-2.6.git.orig/fs/proc/array.c
+++ linux-2.6.git/fs/proc/array.c
@@ -158,6 +158,18 @@ static inline const char *get_task_state
 	return *p;
 }
 
+static void task_children(struct seq_file *m, struct task_struct *p, struct pid_namespace *ns)
+{
+	struct task_struct *c;
+
+	seq_printf(m, "Children:");
+	read_lock(&tasklist_lock);
+	list_for_each_entry(c, &p->children, sibling)
+		seq_printf(m, " %d", pid_nr_ns(task_pid(c), ns));
+	read_unlock(&tasklist_lock);
+	seq_putc(m, '\n');
+}
+
 static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
 				struct pid *pid, struct task_struct *p)
 {
@@ -192,6 +204,8 @@ static inline void task_state(struct seq
 		cred->uid, cred->euid, cred->suid, cred->fsuid,
 		cred->gid, cred->egid, cred->sgid, cred->fsgid);
 
+	task_children(m, p, ns);
+
 	task_lock(p);
 	if (p->files)
 		fdt = files_fdtable(p->files);
--
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