diff options
| author | Jens Axboe <axboe@kernel.dk> | 2025-02-19 10:22:26 -0700 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2025-02-20 10:18:37 +0100 |
| commit | ae3a4f1fdc2cfad089e79e2ee4697f84941528d3 (patch) | |
| tree | 4c460d4123dab15d9c065322a97bfd4d989566e9 /fs/eventpoll.c | |
| parent | 38d203560118a673018df5892a6555bb0aba7762 (diff) | |
eventpoll: add epoll_sendevents() helper
Basic helper that copies ready events to the specified userspace
address. The event checking is quick and racy, it's up to the caller
to ensure it retries appropriately in case 0 events are copied.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Link: https://lore.kernel.org/r/20250219172552.1565603-4-axboe@kernel.dk
Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'fs/eventpoll.c')
| -rw-r--r-- | fs/eventpoll.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/fs/eventpoll.c b/fs/eventpoll.c index 14466765b85d..94b87aaad0f6 100644 --- a/fs/eventpoll.c +++ b/fs/eventpoll.c @@ -2474,6 +2474,26 @@ static int ep_check_params(struct file *file, struct epoll_event __user *evs, return 0; } +int epoll_sendevents(struct file *file, struct epoll_event __user *events, + int maxevents) +{ + struct eventpoll *ep; + int ret; + + ret = ep_check_params(file, events, maxevents); + if (unlikely(ret)) + return ret; + + ep = file->private_data; + /* + * Racy call, but that's ok - it should get retried based on + * poll readiness anyway. + */ + if (ep_events_available(ep)) + return ep_try_send_events(ep, events, maxevents); + return 0; +} + /* * Implement the event wait interface for the eventpoll file. It is the kernel * part of the user space epoll_wait(2). |