Add POLLRDNORM/POLLWRNORM support.

On Linux these are meant to be equivalent to POLLIN/POLLOUT. Rather
than hack these on in sys_poll etc it felt cleaner to just cleanup
the call sites to notify for both events. This is what linux does
as well.

Fixes #5544

PiperOrigin-RevId: 364859977

1 files changed, 3 insertions, 3 deletions

diff --git a/pkg/sentry/vfs/epoll.go b/pkg/sentry/vfs/epoll.go
index 072655fe8..ae004b371 100644
--- a/pkg/sentry/vfs/epoll.go
+++ b/pkg/sentry/vfs/epoll.go
@@ -131,7 +131,7 @@ func (ep *EpollInstance) Release(ctx context.Context) {
 
 // Readiness implements waiter.Waitable.Readiness.
 func (ep *EpollInstance) Readiness(mask waiter.EventMask) waiter.EventMask {
-	if mask&waiter.EventIn == 0 {
+	if mask&waiter.ReadableEvents == 0 {
 		return 0
 	}
 	ep.mu.Lock()
@@ -139,7 +139,7 @@ func (ep *EpollInstance) Readiness(mask waiter.EventMask) waiter.EventMask {
 		wmask := waiter.EventMaskFromLinux(epi.mask)
 		if epi.key.file.Readiness(wmask)&wmask != 0 {
 			ep.mu.Unlock()
-			return waiter.EventIn
+			return waiter.ReadableEvents
 		}
 	}
 	ep.mu.Unlock()
@@ -321,7 +321,7 @@ func (epi *epollInterest) Callback(*waiter.Entry, waiter.EventMask) {
 	}
 	epi.epoll.mu.Unlock()
 	if newReady {
-		epi.epoll.q.Notify(waiter.EventIn)
+		epi.epoll.q.Notify(waiter.ReadableEvents)
 	}
 }