os/exec: ignore hungup error while copying stdin on Plan 9

Fixes #35753

Change-Id: I38674c59c601785eb25b778dc25efdb92231dd9b
Reviewed-on: https://go-review.googlesource.com/c/go/+/208223
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

1 files changed, 19 insertions, 0 deletions

diff --git a/src/os/exec/exec_plan9.go b/src/os/exec/exec_plan9.go
new file mode 100644
index 0000000000..d90bd04399
--- /dev/null
+++ b/src/os/exec/exec_plan9.go
@@ -0,0 +1,19 @@
+// Copyright 2019 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.
+
+package exec
+
+import "os"
+
+func init() {
+	skipStdinCopyError = func(err error) bool {
+		// Ignore hungup errors copying to stdin if the program
+		// completed successfully otherwise.
+		// See Issue 35753.
+		pe, ok := err.(*os.PathError)
+		return ok &&
+			pe.Op == "write" && pe.Path == "|1" &&
+			pe.Err.Error() == "i/o on hungup channel"
+	}
+}