os/exec: ignore some pipe write errors on windows

This change is windows version of CL 12152.
It also extends test to cover scenarios reported on issue #20445.
Some source files copied and renamed to make code clearer.

Fixes #20445

Change-Id: Idd2f636f27c6bd5cfe98017ba2df911358263382
Reviewed-on: https://go-review.googlesource.com/43910
Run-TryBot: Alex Brainman <alex.brainman@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

1 files changed, 24 insertions, 0 deletions

diff --git a/src/os/exec/exec_unix.go b/src/os/exec/exec_unix.go
new file mode 100644
index 0000000000..9c3e17d23a
--- /dev/null
+++ b/src/os/exec/exec_unix.go
@@ -0,0 +1,24 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !plan9,!windows
+
+package exec
+
+import (
+	"os"
+	"syscall"
+)
+
+func init() {
+	skipStdinCopyError = func(err error) bool {
+		// Ignore EPIPE errors copying to stdin if the program
+		// completed successfully otherwise.
+		// See Issue 9173.
+		pe, ok := err.(*os.PathError)
+		return ok &&
+			pe.Op == "write" && pe.Path == "|1" &&
+			pe.Err == syscall.EPIPE
+	}
+}