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

4 files changed, 5 insertions, 5 deletions

diff --git a/pkg/sentry/syscalls/epoll.go b/pkg/sentry/syscalls/epoll.go
index d23a0068a..e115683f8 100644
--- a/pkg/sentry/syscalls/epoll.go
+++ b/pkg/sentry/syscalls/epoll.go
@@ -151,7 +151,7 @@ func WaitEpoll(t *kernel.Task, fd int32, max int, timeout int) ([]linux.EpollEve
 	}
 
 	w, ch := waiter.NewChannelEntry(nil)
-	e.EventRegister(&w, waiter.EventIn)
+	e.EventRegister(&w, waiter.ReadableEvents)
 	defer e.EventUnregister(&w)
 
 	// Try to read the events again until we succeed, timeout or get
diff --git a/pkg/sentry/syscalls/linux/sys_read.go b/pkg/sentry/syscalls/linux/sys_read.go
index f655d3db1..13e5e3a51 100644
--- a/pkg/sentry/syscalls/linux/sys_read.go
+++ b/pkg/sentry/syscalls/linux/sys_read.go
@@ -32,7 +32,7 @@ import (
 
 const (
 	// EventMaskRead contains events that can be triggered on reads.
-	EventMaskRead = waiter.EventIn | waiter.EventHUp | waiter.EventErr
+	EventMaskRead = waiter.ReadableEvents | waiter.EventHUp | waiter.EventErr
 )
 
 // Read implements linux syscall read(2).  Note that we try to get a buffer that
diff --git a/pkg/sentry/syscalls/linux/vfs2/epoll.go b/pkg/sentry/syscalls/linux/vfs2/epoll.go
index d0cbb77eb..b980aa43e 100644
--- a/pkg/sentry/syscalls/linux/vfs2/epoll.go
+++ b/pkg/sentry/syscalls/linux/vfs2/epoll.go
@@ -169,7 +169,7 @@ func EpollWait(t *kernel.Task, args arch.SyscallArguments) (uintptr, *kernel.Sys
 		if ch == nil {
 			var w waiter.Entry
 			w, ch = waiter.NewChannelEntry(nil)
-			epfile.EventRegister(&w, waiter.EventIn)
+			epfile.EventRegister(&w, waiter.ReadableEvents)
 			defer epfile.EventUnregister(&w)
 		} else {
 			// Set up the timer if a timeout was specified.
diff --git a/pkg/sentry/syscalls/linux/vfs2/read_write.go b/pkg/sentry/syscalls/linux/vfs2/read_write.go
index c7417840f..b863d7b84 100644
--- a/pkg/sentry/syscalls/linux/vfs2/read_write.go
+++ b/pkg/sentry/syscalls/linux/vfs2/read_write.go
@@ -30,8 +30,8 @@ import (
 )
 
 const (
-	eventMaskRead  = waiter.EventIn | waiter.EventHUp | waiter.EventErr
-	eventMaskWrite = waiter.EventOut | waiter.EventHUp | waiter.EventErr
+	eventMaskRead  = waiter.EventRdNorm | waiter.EventIn | waiter.EventHUp | waiter.EventErr
+	eventMaskWrite = waiter.EventWrNorm | waiter.EventOut | waiter.EventHUp | waiter.EventErr
 )
 
 // Read implements Linux syscall read(2).