From 224bc9e60c7e2e1f04573bc377121c8f844d57c6 Mon Sep 17 00:00:00 2001
From: David Crawshaw <crawshaw@tailscale.com>
Date: Wed, 19 Feb 2020 10:09:24 -0500
Subject: rwcancel: no-op builds for windows and darwin

This lets us include the package on those platforms in a
followup commit where we split out a conn package from device.
It also lets us run `go test ./...` when developing on macOS.

Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
---
 rwcancel/fdset.go            | 2 ++
 rwcancel/rwcancel.go         | 4 ++++
 rwcancel/rwcancel_windows.go | 8 ++++++++
 rwcancel/select_default.go   | 5 +++--
 4 files changed, 17 insertions(+), 2 deletions(-)
 create mode 100644 rwcancel/rwcancel_windows.go

(limited to 'rwcancel')

diff --git a/rwcancel/fdset.go b/rwcancel/fdset.go
index 28746e6..91bd757 100644
--- a/rwcancel/fdset.go
+++ b/rwcancel/fdset.go
@@ -1,3 +1,5 @@
+// +build !windows
+
 /* SPDX-License-Identifier: MIT
  *
  * Copyright (C) 2017-2019 WireGuard LLC. All Rights Reserved.
diff --git a/rwcancel/rwcancel.go b/rwcancel/rwcancel.go
index 808e691..3c4a9ed 100644
--- a/rwcancel/rwcancel.go
+++ b/rwcancel/rwcancel.go
@@ -1,8 +1,12 @@
+// +build !windows
+
 /* SPDX-License-Identifier: MIT
  *
  * Copyright (C) 2017-2019 WireGuard LLC. All Rights Reserved.
  */
 
+// Package rwcancel implements cancelable read/write operations on
+// a file descriptor.
 package rwcancel
 
 import (
diff --git a/rwcancel/rwcancel_windows.go b/rwcancel/rwcancel_windows.go
new file mode 100644
index 0000000..0316911
--- /dev/null
+++ b/rwcancel/rwcancel_windows.go
@@ -0,0 +1,8 @@
+// SPDX-License-Identifier: MIT
+
+package rwcancel
+
+type RWCancel struct {
+}
+
+func (*RWCancel) Cancel() {}
diff --git a/rwcancel/select_default.go b/rwcancel/select_default.go
index dd23cda..82e07dc 100644
--- a/rwcancel/select_default.go
+++ b/rwcancel/select_default.go
@@ -1,4 +1,4 @@
-// +build !linux
+// +build !linux,!windows
 
 /* SPDX-License-Identifier: MIT
  *
@@ -10,5 +10,6 @@ package rwcancel
 import "golang.org/x/sys/unix"
 
 func unixSelect(nfd int, r *unix.FdSet, w *unix.FdSet, e *unix.FdSet, timeout *unix.Timeval) error {
-	return unix.Select(nfd, r, w, e, timeout)
+	_, err := unix.Select(nfd, r, w, e, timeout)
+	return err
 }
-- 
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