internal/poll: define PollDescriptor on plan9

Fixes #19114.

Change-Id: I352add53d6ee8bf78792564225099f8537ac6b46
Reviewed-on: https://go-review.googlesource.com/37106
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: David du Colombier <0intro@gmail.com>

diff --git a/src/internal/poll/fd_plan9.go b/src/internal/poll/fd_plan9.go
index 1529bc6fde91113c47e9ff70b4d9792d8cad6409..5b2c674b36db20bf72b29c955fed34bdff6fc359 100644 (file)
--- a/src/internal/poll/fd_plan9.go
+++ b/src/internal/poll/fd_plan9.go
@@ -178,3 +178,7 @@ func isHangup(err error) bool {
 func isInterrupted(err error) bool {
        return err != nil && stringsHasSuffix(err.Error(), "interrupted")
 }
+
+func PollDescriptor() uintptr {
+       return ^uintptr(0)
+}