1 files changed, 59 insertions, 0 deletions
diff --git a/src/os/signal/internal/pty/pty.go b/src/os/signal/internal/pty/pty.go
new file mode 100644
index 0000000..f8813ce
--- /dev/null
+++ b/src/os/signal/internal/pty/pty.go
@@ -0,0 +1,59 @@
+// Copyright 2017 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 aix darwin dragonfly freebsd linux,!android netbsd openbsd
+// +build cgo
+
+// Package pty is a simple pseudo-terminal package for Unix systems,
+// implemented by calling C functions via cgo.
+// This is only used for testing the os/signal package.
+package pty
+
+/*
+#define _XOPEN_SOURCE 600
+#include <fcntl.h>
+#include <stdlib.h>
+#include <unistd.h>
+*/
+import "C"
+
+import (
+	"fmt"
+	"os"
+	"syscall"
+)
+
+type PtyError struct {
+	FuncName    string
+	ErrorString string
+	Errno       syscall.Errno
+}
+
+func ptyError(name string, err error) *PtyError {
+	return &PtyError{name, err.Error(), err.(syscall.Errno)}
+}
+
+func (e *PtyError) Error() string {
+	return fmt.Sprintf("%s: %s", e.FuncName, e.ErrorString)
+}
+
+func (e *PtyError) Unwrap() error { return e.Errno }
+
+// Open returns a control pty and the name of the linked process tty.
+func Open() (pty *os.File, processTTY string, err error) {
+	m, err := C.posix_openpt(C.O_RDWR)
+	if err != nil {
+		return nil, "", ptyError("posix_openpt", err)
+	}
+	if _, err := C.grantpt(m); err != nil {
+		C.close(m)
+		return nil, "", ptyError("grantpt", err)
+	}
+	if _, err := C.unlockpt(m); err != nil {
+		C.close(m)
+		return nil, "", ptyError("unlockpt", err)
+	}
+	processTTY = C.GoString(C.ptsname(m))
+	return os.NewFile(uintptr(m), "pty"), processTTY, nil
+}