Update vendor for kr/pty

Docker-DCO-1.1-Signed-off-by: Guillaume J. Charmes <guillaume.charmes@docker.com> (github: creack)

vendor/src/github.com/kr/pty/doc.go

@@ -2,9 +2,14 @@
 package pty
 
 import (
+	"errors"
 	"os"
 )
 
+// ErrUnsupported is returned if a function is not
+// available on the current platform.
+var ErrUnsupported = errors.New("unsupported")
+
 // Opens a pty and its corresponding tty.
 func Open() (pty, tty *os.File, err error) {
 	return open()

vendor/src/github.com/kr/pty/pty_freebsd.go

@@ -0,0 +1,53 @@
+package pty
+
+import (
+	"os"
+	"strconv"
+	"syscall"
+	"unsafe"
+)
+
+const (
+	sys_TIOCGPTN   = 0x4004740F
+	sys_TIOCSPTLCK = 0x40045431
+)
+
+func open() (pty, tty *os.File, err error) {
+	p, err := os.OpenFile("/dev/ptmx", os.O_RDWR, 0)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	sname, err := ptsname(p)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	t, err := os.OpenFile(sname, os.O_RDWR|syscall.O_NOCTTY, 0)
+	if err != nil {
+		return nil, nil, err
+	}
+	return p, t, nil
+}
+
+func ptsname(f *os.File) (string, error) {
+	var n int
+	err := ioctl(f.Fd(), sys_TIOCGPTN, &n)
+	if err != nil {
+		return "", err
+	}
+	return "/dev/pts/" + strconv.Itoa(n), nil
+}
+
+func ioctl(fd uintptr, cmd uintptr, data *int) error {
+	_, _, e := syscall.Syscall(
+		syscall.SYS_IOCTL,
+		fd,
+		cmd,
+		uintptr(unsafe.Pointer(data)),
+	)
+	if e != 0 {
+		return syscall.ENOTTY
+	}
+	return nil
+}

vendor/src/github.com/kr/pty/pty_unsupported.go

@@ -0,0 +1,27 @@
+// +build !linux,!darwin,!freebsd
+
+package pty
+
+import (
+	"os"
+)
+
+func open() (pty, tty *os.File, err error) {
+	return nil, nil, ErrUnsupported
+}
+
+func ptsname(f *os.File) (string, error) {
+	return "", ErrUnsupported
+}
+
+func grantpt(f *os.File) error {
+	return ErrUnsupported
+}
+
+func unlockpt(f *os.File) error {
+	return ErrUnsupported
+}
+
+func ioctl(fd, cmd, ptr uintptr) error {
+	return ErrUnsupported
+}