internal/testpty: move from os/signal/internal/pty

We're going to use this for another test, so make it more accessible.

Preparation for #37486.

Change-Id: If194cc4244c4b9e1b1f253759b813555b39ad67e
Reviewed-on: https://go-review.googlesource.com/c/go/+/449502
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>

4 files changed, 3 insertions, 106 deletions

diff --git a/src/os/signal/internal/pty/pty.go b/src/os/signal/internal/pty/pty.go
deleted file mode 100644
index 4bb0391036..0000000000
--- a/src/os/signal/internal/pty/pty.go
+++ /dev/null
@@ -1,37 +0,0 @@
-// 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.
-
-//go:build ((aix || dragonfly || freebsd || (linux && !android) || netbsd || openbsd) && cgo) || darwin
-
-// 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
-
-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) {
-	return open()
-}
diff --git a/src/os/signal/internal/pty/pty_cgo.go b/src/os/signal/internal/pty/pty_cgo.go
deleted file mode 100644
index 47ca71bc65..0000000000
--- a/src/os/signal/internal/pty/pty_cgo.go
+++ /dev/null
@@ -1,34 +0,0 @@
-// 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.
-
-//go:build cgo && (aix || dragonfly || freebsd || (linux && !android) || netbsd || openbsd)
-
-package pty
-
-/*
-#define _XOPEN_SOURCE 600
-#include <fcntl.h>
-#include <stdlib.h>
-#include <unistd.h>
-*/
-import "C"
-
-import "os"
-
-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
-}
diff --git a/src/os/signal/internal/pty/pty_darwin.go b/src/os/signal/internal/pty/pty_darwin.go
deleted file mode 100644
index 6fc49f3c9a..0000000000
--- a/src/os/signal/internal/pty/pty_darwin.go
+++ /dev/null
@@ -1,32 +0,0 @@
-// 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.
-
-package pty
-
-import (
-	"internal/syscall/unix"
-	"os"
-	"syscall"
-)
-
-func open() (pty *os.File, processTTY string, err error) {
-	m, err := unix.PosixOpenpt(syscall.O_RDWR)
-	if err != nil {
-		return nil, "", ptyError("posix_openpt", err)
-	}
-	if err := unix.Grantpt(m); err != nil {
-		syscall.Close(m)
-		return nil, "", ptyError("grantpt", err)
-	}
-	if err := unix.Unlockpt(m); err != nil {
-		syscall.Close(m)
-		return nil, "", ptyError("unlockpt", err)
-	}
-	processTTY, err = unix.Ptsname(m)
-	if err != nil {
-		syscall.Close(m)
-		return nil, "", ptyError("ptsname", err)
-	}
-	return os.NewFile(uintptr(m), "pty"), processTTY, nil
-}
diff --git a/src/os/signal/signal_cgo_test.go b/src/os/signal/signal_cgo_test.go
index 5cfb00632d..ac5921591e 100644
--- a/src/os/signal/signal_cgo_test.go
+++ b/src/os/signal/signal_cgo_test.go
@@ -14,10 +14,10 @@ import (
 	"context"
 	"encoding/binary"
 	"fmt"
+	"internal/testpty"
 	"os"
 	"os/exec"
 	"os/signal"
-	ptypkg "os/signal/internal/pty"
 	"runtime"
 	"strconv"
 	"syscall"
@@ -105,9 +105,9 @@ func TestTerminalSignal(t *testing.T) {
 
 	t.Parallel()
 
-	pty, procTTYName, err := ptypkg.Open()
+	pty, procTTYName, err := testpty.Open()
 	if err != nil {
-		ptyErr := err.(*ptypkg.PtyError)
+		ptyErr := err.(*testpty.PtyError)
 		if ptyErr.FuncName == "posix_openpt" && ptyErr.Errno == syscall.EACCES {
 			t.Skip("posix_openpt failed with EACCES, assuming chroot and skipping")
 		}