pid: get pid_t ppid of task in init_pid_ns

[pandora-kernel.git] / include / linux / sched.h

diff --git a/include/linux/sched.h b/include/linux/sched.h
index c17fdfb..cb34ff4 100644 (file)
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1690,6 +1690,24 @@ static inline pid_t task_tgid_vnr(struct task_struct *tsk)
 }
 
 
+static int pid_alive(const struct task_struct *p);
+static inline pid_t task_ppid_nr_ns(const struct task_struct *tsk, struct pid_namespace *ns)
+{
+       pid_t pid = 0;
+
+       rcu_read_lock();
+       if (pid_alive(tsk))
+               pid = task_tgid_nr_ns(rcu_dereference(tsk->real_parent), ns);
+       rcu_read_unlock();
+
+       return pid;
+}
+
+static inline pid_t task_ppid_nr(const struct task_struct *tsk)
+{
+       return task_ppid_nr_ns(tsk, &init_pid_ns);
+}
+
 static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk,
                                        struct pid_namespace *ns)
 {
@@ -1727,7 +1745,7 @@ static inline pid_t task_pgrp_nr(struct task_struct *tsk)
  * If pid_alive fails, then pointers within the task structure
  * can be stale and must not be dereferenced.
  */
-static inline int pid_alive(struct task_struct *p)
+static inline int pid_alive(const struct task_struct *p)
 {
        return p->pids[PIDTYPE_PID].pid != NULL;
 }