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| author | Oleg Nesterov <oleg@redhat.com> | 2024-02-02 14:12:26 +0100 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2024-02-02 14:57:53 +0100 |
| commit | 43f0df54c96fa5abcab9df8649c1e52119bf0238 (patch) | |
| tree | 3233889920853f7ea8355d41d33f084dad59f799 /kernel/pid.c | |
| parent | 64bef697d33b75fc06c5789b3f8108680271529f (diff) | |
| download | linux-43f0df54c96fa5abcab9df8649c1e52119bf0238.tar.gz linux-43f0df54c96fa5abcab9df8649c1e52119bf0238.tar.bz2 linux-43f0df54c96fa5abcab9df8649c1e52119bf0238.zip | |
pidfd_poll: report POLLHUP when pid_task() == NULL
Add another wake_up_all(wait_pidfd) into __change_pid() and change
pidfd_poll() to include EPOLLHUP if task == NULL.
This allows to wait until the target process/thread is reaped.
TODO: change do_notify_pidfd() to use the keyed wakeups.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Link: https://lore.kernel.org/r/20240202131226.GA26018@redhat.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'kernel/pid.c')
| -rw-r--r-- | kernel/pid.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/pid.c b/kernel/pid.c index e11144466828..62461c7c82b8 100644 --- a/kernel/pid.c +++ b/kernel/pid.c @@ -349,6 +349,11 @@ static void __change_pid(struct task_struct *task, enum pid_type type, hlist_del_rcu(&task->pid_links[type]); *pid_ptr = new; + if (type == PIDTYPE_PID) { + WARN_ON_ONCE(pid_has_task(pid, PIDTYPE_PID)); + wake_up_all(&pid->wait_pidfd); + } + for (tmp = PIDTYPE_MAX; --tmp >= 0; ) if (pid_has_task(pid, tmp)) return; |