1 files changed, 21 insertions, 1 deletions
diff --git a/libgo/go/runtime/testdata/testprogcgo/cgo.go b/libgo/go/runtime/testdata/testprogcgo/cgo.go
index cf1af8268ca..870d4efdead 100644
--- a/libgo/go/runtime/testdata/testprogcgo/cgo.go
+++ b/libgo/go/runtime/testdata/testprogcgo/cgo.go
@@ -1,4 +1,4 @@
-// Copyright 2015 The Go Authors.  All rights reserved.
+// 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.
 
@@ -6,17 +6,22 @@ package main
 
 /*
 void foo1(void) {}
+void foo2(void* p) {}
 */
 import "C"
 import (
 	"fmt"
+	"os"
 	"runtime"
+	"strconv"
 	"time"
+	"unsafe"
 )
 
 func init() {
 	register("CgoSignalDeadlock", CgoSignalDeadlock)
 	register("CgoTraceback", CgoTraceback)
+	register("CgoCheckBytes", CgoCheckBytes)
 }
 
 func CgoSignalDeadlock() {
@@ -78,3 +83,18 @@ func CgoTraceback() {
 	runtime.Stack(buf, true)
 	fmt.Printf("OK\n")
 }
+
+func CgoCheckBytes() {
+	try, _ := strconv.Atoi(os.Getenv("GO_CGOCHECKBYTES_TRY"))
+	if try <= 0 {
+		try = 1
+	}
+	b := make([]byte, 1e6*try)
+	start := time.Now()
+	for i := 0; i < 1e3*try; i++ {
+		C.foo2(unsafe.Pointer(&b[0]))
+		if time.Since(start) > time.Second {
+			break
+		}
+	}
+}