Merge pull request #1398 from clnperez/console-fix

Fix console syscalls

Author: crosbymichael

libcontainer/console_linux.go

@@ -3,8 +3,9 @@ package libcontainer
 import (
 	"fmt"
 	"os"
-	"syscall"
 	"unsafe"
+
+	"golang.org/x/sys/unix"
 )
 
 func ConsoleFromFile(f *os.File) Console {
@@ -16,7 +17,7 @@ func ConsoleFromFile(f *os.File) Console {
 // newConsole returns an initialized console that can be used within a container by copying bytes
 // from the master side to the slave that is attached as the tty for the container's init process.
 func newConsole() (Console, error) {
-	master, err := os.OpenFile("/dev/ptmx", syscall.O_RDWR|syscall.O_NOCTTY|syscall.O_CLOEXEC, 0)
+	master, err := os.OpenFile("/dev/ptmx", unix.O_RDWR|unix.O_NOCTTY|unix.O_CLOEXEC, 0)
 	if err != nil {
 		return nil, err
 	}
@@ -68,28 +69,28 @@ func (c *linuxConsole) Close() error {
 // mount initializes the console inside the rootfs mounting with the specified mount label
 // and applying the correct ownership of the console.
 func (c *linuxConsole) mount() error {
-	oldMask := syscall.Umask(0000)
-	defer syscall.Umask(oldMask)
+	oldMask := unix.Umask(0000)
+	defer unix.Umask(oldMask)
 	f, err := os.Create("/dev/console")
 	if err != nil && !os.IsExist(err) {
 		return err
 	}
 	if f != nil {
 		f.Close()
 	}
-	return syscall.Mount(c.slavePath, "/dev/console", "bind", syscall.MS_BIND, "")
+	return unix.Mount(c.slavePath, "/dev/console", "bind", unix.MS_BIND, "")
 }
 
 // dupStdio opens the slavePath for the console and dups the fds to the current
 // processes stdio, fd 0,1,2.
 func (c *linuxConsole) dupStdio() error {
-	slave, err := c.open(syscall.O_RDWR)
+	slave, err := c.open(unix.O_RDWR)
 	if err != nil {
 		return err
 	}
 	fd := int(slave.Fd())
 	for _, i := range []int{0, 1, 2} {
-		if err := syscall.Dup3(fd, i, 0); err != nil {
+		if err := unix.Dup3(fd, i, 0); err != nil {
 			return err
 		}
 	}
@@ -98,7 +99,7 @@ func (c *linuxConsole) dupStdio() error {
 
 // open is a clone of os.OpenFile without the O_CLOEXEC used to open the pty slave.
 func (c *linuxConsole) open(flag int) (*os.File, error) {
-	r, e := syscall.Open(c.slavePath, flag, 0)
+	r, e := unix.Open(c.slavePath, flag, 0)
 	if e != nil {
 		return nil, &os.PathError{
 			Op:   "open",
@@ -110,7 +111,7 @@ func (c *linuxConsole) open(flag int) (*os.File, error) {
 }
 
 func ioctl(fd uintptr, flag, data uintptr) error {
-	if _, _, err := syscall.Syscall(syscall.SYS_IOCTL, fd, flag, data); err != 0 {
+	if _, _, err := unix.Syscall(unix.SYS_IOCTL, fd, flag, data); err != 0 {
 		return err
 	}
 	return nil
@@ -120,13 +121,13 @@ func ioctl(fd uintptr, flag, data uintptr) error {
 // unlockpt should be called before opening the slave side of a pty.
 func unlockpt(f *os.File) error {
 	var u int32
-	return ioctl(f.Fd(), syscall.TIOCSPTLCK, uintptr(unsafe.Pointer(&u)))
+	return ioctl(f.Fd(), unix.TIOCSPTLCK, uintptr(unsafe.Pointer(&u)))
 }
 
 // ptsname retrieves the name of the first available pts for the given master.
 func ptsname(f *os.File) (string, error) {
 	var n int32
-	if err := ioctl(f.Fd(), syscall.TIOCGPTN, uintptr(unsafe.Pointer(&n))); err != nil {
+	if err := ioctl(f.Fd(), unix.TIOCGPTN, uintptr(unsafe.Pointer(&n))); err != nil {
 		return "", err
 	}
 	return fmt.Sprintf("/dev/pts/%d", n), nil
@@ -139,16 +140,16 @@ func ptsname(f *os.File) (string, error) {
 // also relay that funky line discipline.
 func saneTerminal(terminal *os.File) error {
 	// Go doesn't have a wrapper for any of the termios ioctls.
-	var termios syscall.Termios
+	var termios unix.Termios
 
-	if err := ioctl(terminal.Fd(), syscall.TCGETS, uintptr(unsafe.Pointer(&termios))); err != nil {
+	if err := ioctl(terminal.Fd(), unix.TCGETS, uintptr(unsafe.Pointer(&termios))); err != nil {
 		return fmt.Errorf("ioctl(tty, tcgets): %s", err.Error())
 	}
 
 	// Set -onlcr so we don't have to deal with \r.
-	termios.Oflag &^= syscall.ONLCR
+	termios.Oflag &^= unix.ONLCR
 
-	if err := ioctl(terminal.Fd(), syscall.TCSETS, uintptr(unsafe.Pointer(&termios))); err != nil {
+	if err := ioctl(terminal.Fd(), unix.TCSETS, uintptr(unsafe.Pointer(&termios))); err != nil {
 		return fmt.Errorf("ioctl(tty, tcsets): %s", err.Error())
 	}