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Diffstat (limited to 'include/linux/sched.h')
-rw-r--r--include/linux/sched.h20
1 files changed, 19 insertions, 1 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 075b3056c0c0..25f54c79f757 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1719,6 +1719,24 @@ static inline pid_t task_tgid_vnr(struct task_struct *tsk)
}
+static inline 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)
{
@@ -1758,7 +1776,7 @@ static inline pid_t task_pgrp_nr(struct task_struct *tsk)
*
* Return: 1 if the process is alive. 0 otherwise.
*/
-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;
}