runtime: check for events when port_getn fails with ETIME

On illumos systems, and at least historically on Solaris systems, it is
possible for port_getn(3C) calls to return some number of events and
then fail with error ETIME.

Generally we expect this to happen if the caller passes an nget value
larger than 1 and calls with a timeout; if less than the requested
number of events accumulate the system will still return them after
timeout failure so the caller must check the updated nget value in the
ETIME case.  Note that although less likely this can still happen even
when requesting just 1 event, especially with a short timeout value or
on a busy system.

Fixes #35261

Change-Id: I0d83251b69a2fadc64c4e8e280aa596e2e1548ba
Reviewed-on: https://go-review.googlesource.com/c/go/+/204801Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/runtime/netpoll_solaris.go

@@ -229,13 +229,21 @@ func netpoll(delay int64) gList {
 	var events [128]portevent
 retry:
 	var n uint32 = 1
-	if port_getn(portfd, &events[0], uint32(len(events)), &n, wait) < 0 {
-		if e := errno(); e != _EINTR && e != _ETIME {
+	r := port_getn(portfd, &events[0], uint32(len(events)), &n, wait)
+	e := errno()
+	if r < 0 && e == _ETIME && n > 0 {
+		// As per port_getn(3C), an ETIME failure does not preclude the
+		// delivery of some number of events.  Treat a timeout failure
+		// with delivered events as a success.
+		r = 0
+	}
+	if r < 0 {
+		if e != _EINTR && e != _ETIME {
 			print("runtime: port_getn on fd ", portfd, " failed (errno=", e, ")\n")
 			throw("runtime: netpoll failed")
 		}
-		// If a timed sleep was interrupted, just return to
-		// recalculate how long we should sleep now.
+		// If a timed sleep was interrupted and there are no events,
+		// just return to recalculate how long we should sleep now.
 		if delay > 0 {
 			return gList{}
 		}