[PATCH 3/7] proc: Introduce the Children: line in /proc/<pid>/status

[Pavel Emelyanov <xemul-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>]

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-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>.

---
 fs/proc/array.c |   14 ++++++++++++++
 1 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/fs/proc/array.c b/fs/proc/array.c
index 5e4f776..f01f480 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -158,6 +158,18 @@ static inline const char *get_task_state(struct task_struct *tsk)
 	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_file *m, struct pid_namespace *ns,
 		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);
-- 
1.5.5.6