libgo: add misc/cgo files

    
    Copy all the misc/cgo files from the gc toolchain into libgo/misc.
    
    These will be used for testing purposes by later changes to the
    gotools directory.
    
    Reviewed-on: https://go-review.googlesource.com/46721

From-SVN: r249674

1 files changed, 49 insertions, 0 deletions

diff --git a/libgo/misc/cgo/test/setgid_linux.go b/libgo/misc/cgo/test/setgid_linux.go
new file mode 100644
index 0000000..6773f94
--- /dev/null
+++ b/libgo/misc/cgo/test/setgid_linux.go
@@ -0,0 +1,49 @@
+// Copyright 2012 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.
+
+// Test that setgid does not hang on GNU/Linux.
+// See https://golang.org/issue/3871 for details.
+
+package cgotest
+
+/*
+#include <sys/types.h>
+#include <unistd.h>
+*/
+import "C"
+
+import (
+	"os"
+	"os/signal"
+	"syscall"
+	"testing"
+	"time"
+)
+
+func runTestSetgid() bool {
+	c := make(chan bool)
+	go func() {
+		C.setgid(0)
+		c <- true
+	}()
+	select {
+	case <-c:
+		return true
+	case <-time.After(5 * time.Second):
+		return false
+	}
+
+}
+
+func testSetgid(t *testing.T) {
+	if !runTestSetgid() {
+		t.Error("setgid hung")
+	}
+
+	// Now try it again after using signal.Notify.
+	signal.Notify(make(chan os.Signal, 1), syscall.SIGINT)
+	if !runTestSetgid() {
+		t.Error("setgid hung after signal.Notify")
+	}
+}