exp/terminal: split terminal handling from exp/ssh

This change splits terminal handling from exp/ssh, as suggested
several times in the ssh code review.

shell.go and shell_test.go are copies from exp/ssh with minimal
changes, so don't need another full review. A future CL will remove
that code from exp/ssh.

R=bradfitz, r, dave, rsc
CC=golang-dev
https://golang.org/cl/5278049

6 files changed, 805 insertions, 0 deletions

diff --git a/src/pkg/exp/terminal/Makefile b/src/pkg/exp/terminal/Makefile
new file mode 100644
index 0000000000..40331d6e40
--- /dev/null
+++ b/src/pkg/exp/terminal/Makefile
@@ -0,0 +1,15 @@
+# Copyright 2011 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.
+
+include ../../../Make.inc
+
+TARG=exp/terminal
+GOFILES=\
+	shell.go\
+
+ifneq ($(GOOS),windows)
+GOFILES+=terminal.go
+endif
+
+include ../../../Make.pkg
diff --git a/src/pkg/exp/terminal/shell.go b/src/pkg/exp/terminal/shell.go
new file mode 100644
index 0000000000..e3f584774e
--- /dev/null
+++ b/src/pkg/exp/terminal/shell.go
@@ -0,0 +1,359 @@
+// Copyright 2011 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 terminal
+
+import (
+	"os"
+	"io"
+)
+
+// Shell contains the state for running a VT100 terminal that is capable of
+// reading lines of input.
+type Shell struct {
+	c      io.ReadWriter
+	prompt string
+
+	// line is the current line being entered.
+	line []byte
+	// pos is the logical position of the cursor in line
+	pos int
+
+	// cursorX contains the current X value of the cursor where the left
+	// edge is 0. cursorY contains the row number where the first row of
+	// the current line is 0.
+	cursorX, cursorY int
+	// maxLine is the greatest value of cursorY so far.
+	maxLine int
+
+	termWidth, termHeight int
+
+	// outBuf contains the terminal data to be sent.
+	outBuf []byte
+	// remainder contains the remainder of any partial key sequences after
+	// a read. It aliases into inBuf.
+	remainder []byte
+	inBuf     [256]byte
+}
+
+// NewShell runs a VT100 terminal on the given ReadWriter. If the ReadWriter is
+// a local terminal, that terminal must first have been put into raw mode.
+// prompt is a string that is written at the start of each input line (i.e.
+// "> ").
+func NewShell(c io.ReadWriter, prompt string) *Shell {
+	return &Shell{
+		c:          c,
+		prompt:     prompt,
+		termWidth:  80,
+		termHeight: 24,
+	}
+}
+
+const (
+	keyCtrlD     = 4
+	keyEnter     = '\r'
+	keyEscape    = 27
+	keyBackspace = 127
+	keyUnknown   = 256 + iota
+	keyUp
+	keyDown
+	keyLeft
+	keyRight
+	keyAltLeft
+	keyAltRight
+)
+
+// bytesToKey tries to parse a key sequence from b. If successful, it returns
+// the key and the remainder of the input. Otherwise it returns -1.
+func bytesToKey(b []byte) (int, []byte) {
+	if len(b) == 0 {
+		return -1, nil
+	}
+
+	if b[0] != keyEscape {
+		return int(b[0]), b[1:]
+	}
+
+	if len(b) >= 3 && b[0] == keyEscape && b[1] == '[' {
+		switch b[2] {
+		case 'A':
+			return keyUp, b[3:]
+		case 'B':
+			return keyDown, b[3:]
+		case 'C':
+			return keyRight, b[3:]
+		case 'D':
+			return keyLeft, b[3:]
+		}
+	}
+
+	if len(b) >= 6 && b[0] == keyEscape && b[1] == '[' && b[2] == '1' && b[3] == ';' && b[4] == '3' {
+		switch b[5] {
+		case 'C':
+			return keyAltRight, b[6:]
+		case 'D':
+			return keyAltLeft, b[6:]
+		}
+	}
+
+	// If we get here then we have a key that we don't recognise, or a
+	// partial sequence. It's not clear how one should find the end of a
+	// sequence without knowing them all, but it seems that [a-zA-Z] only
+	// appears at the end of a sequence.
+	for i, c := range b[0:] {
+		if c >= 'a' && c <= 'z' || c >= 'A' && c <= 'Z' {
+			return keyUnknown, b[i+1:]
+		}
+	}
+
+	return -1, b
+}
+
+// queue appends data to the end of ss.outBuf
+func (ss *Shell) queue(data []byte) {
+	if len(ss.outBuf)+len(data) > cap(ss.outBuf) {
+		newOutBuf := make([]byte, len(ss.outBuf), 2*(len(ss.outBuf)+len(data)))
+		copy(newOutBuf, ss.outBuf)
+		ss.outBuf = newOutBuf
+	}
+
+	oldLen := len(ss.outBuf)
+	ss.outBuf = ss.outBuf[:len(ss.outBuf)+len(data)]
+	copy(ss.outBuf[oldLen:], data)
+}
+
+var eraseUnderCursor = []byte{' ', keyEscape, '[', 'D'}
+
+func isPrintable(key int) bool {
+	return key >= 32 && key < 127
+}
+
+// moveCursorToPos appends data to ss.outBuf which will move the cursor to the
+// given, logical position in the text.
+func (ss *Shell) moveCursorToPos(pos int) {
+	x := len(ss.prompt) + pos
+	y := x / ss.termWidth
+	x = x % ss.termWidth
+
+	up := 0
+	if y < ss.cursorY {
+		up = ss.cursorY - y
+	}
+
+	down := 0
+	if y > ss.cursorY {
+		down = y - ss.cursorY
+	}
+
+	left := 0
+	if x < ss.cursorX {
+		left = ss.cursorX - x
+	}
+
+	right := 0
+	if x > ss.cursorX {
+		right = x - ss.cursorX
+	}
+
+	movement := make([]byte, 3*(up+down+left+right))
+	m := movement
+	for i := 0; i < up; i++ {
+		m[0] = keyEscape
+		m[1] = '['
+		m[2] = 'A'
+		m = m[3:]
+	}
+	for i := 0; i < down; i++ {
+		m[0] = keyEscape
+		m[1] = '['
+		m[2] = 'B'
+		m = m[3:]
+	}
+	for i := 0; i < left; i++ {
+		m[0] = keyEscape
+		m[1] = '['
+		m[2] = 'D'
+		m = m[3:]
+	}
+	for i := 0; i < right; i++ {
+		m[0] = keyEscape
+		m[1] = '['
+		m[2] = 'C'
+		m = m[3:]
+	}
+
+	ss.cursorX = x
+	ss.cursorY = y
+	ss.queue(movement)
+}
+
+const maxLineLength = 4096
+
+// handleKey processes the given key and, optionally, returns a line of text
+// that the user has entered.
+func (ss *Shell) handleKey(key int) (line string, ok bool) {
+	switch key {
+	case keyBackspace:
+		if ss.pos == 0 {
+			return
+		}
+		ss.pos--
+
+		copy(ss.line[ss.pos:], ss.line[1+ss.pos:])
+		ss.line = ss.line[:len(ss.line)-1]
+		ss.writeLine(ss.line[ss.pos:])
+		ss.moveCursorToPos(ss.pos)
+		ss.queue(eraseUnderCursor)
+	case keyAltLeft:
+		// move left by a word.
+		if ss.pos == 0 {
+			return
+		}
+		ss.pos--
+		for ss.pos > 0 {
+			if ss.line[ss.pos] != ' ' {
+				break
+			}
+			ss.pos--
+		}
+		for ss.pos > 0 {
+			if ss.line[ss.pos] == ' ' {
+				ss.pos++
+				break
+			}
+			ss.pos--
+		}
+		ss.moveCursorToPos(ss.pos)
+	case keyAltRight:
+		// move right by a word.
+		for ss.pos < len(ss.line) {
+			if ss.line[ss.pos] == ' ' {
+				break
+			}
+			ss.pos++
+		}
+		for ss.pos < len(ss.line) {
+			if ss.line[ss.pos] != ' ' {
+				break
+			}
+			ss.pos++
+		}
+		ss.moveCursorToPos(ss.pos)
+	case keyLeft:
+		if ss.pos == 0 {
+			return
+		}
+		ss.pos--
+		ss.moveCursorToPos(ss.pos)
+	case keyRight:
+		if ss.pos == len(ss.line) {
+			return
+		}
+		ss.pos++
+		ss.moveCursorToPos(ss.pos)
+	case keyEnter:
+		ss.moveCursorToPos(len(ss.line))
+		ss.queue([]byte("\r\n"))
+		line = string(ss.line)
+		ok = true
+		ss.line = ss.line[:0]
+		ss.pos = 0
+		ss.cursorX = 0
+		ss.cursorY = 0
+		ss.maxLine = 0
+	default:
+		if !isPrintable(key) {
+			return
+		}
+		if len(ss.line) == maxLineLength {
+			return
+		}
+		if len(ss.line) == cap(ss.line) {
+			newLine := make([]byte, len(ss.line), 2*(1+len(ss.line)))
+			copy(newLine, ss.line)
+			ss.line = newLine
+		}
+		ss.line = ss.line[:len(ss.line)+1]
+		copy(ss.line[ss.pos+1:], ss.line[ss.pos:])
+		ss.line[ss.pos] = byte(key)
+		ss.writeLine(ss.line[ss.pos:])
+		ss.pos++
+		ss.moveCursorToPos(ss.pos)
+	}
+	return
+}
+
+func (ss *Shell) writeLine(line []byte) {
+	for len(line) != 0 {
+		if ss.cursorX == ss.termWidth {
+			ss.queue([]byte("\r\n"))
+			ss.cursorX = 0
+			ss.cursorY++
+			if ss.cursorY > ss.maxLine {
+				ss.maxLine = ss.cursorY
+			}
+		}
+
+		remainingOnLine := ss.termWidth - ss.cursorX
+		todo := len(line)
+		if todo > remainingOnLine {
+			todo = remainingOnLine
+		}
+		ss.queue(line[:todo])
+		ss.cursorX += todo
+		line = line[todo:]
+	}
+}
+
+func (ss *Shell) Write(buf []byte) (n int, err os.Error) {
+	return ss.c.Write(buf)
+}
+
+// ReadLine returns a line of input from the terminal.
+func (ss *Shell) ReadLine() (line string, err os.Error) {
+	ss.writeLine([]byte(ss.prompt))
+	ss.c.Write(ss.outBuf)
+	ss.outBuf = ss.outBuf[:0]
+
+	for {
+		// ss.remainder is a slice at the beginning of ss.inBuf
+		// containing a partial key sequence
+		readBuf := ss.inBuf[len(ss.remainder):]
+		var n int
+		n, err = ss.c.Read(readBuf)
+		if err != nil {
+			return
+		}
+
+		if err == nil {
+			ss.remainder = ss.inBuf[:n+len(ss.remainder)]
+			rest := ss.remainder
+			lineOk := false
+			for !lineOk {
+				var key int
+				key, rest = bytesToKey(rest)
+				if key < 0 {
+					break
+				}
+				if key == keyCtrlD {
+					return "", os.EOF
+				}
+				line, lineOk = ss.handleKey(key)
+			}
+			if len(rest) > 0 {
+				n := copy(ss.inBuf[:], rest)
+				ss.remainder = ss.inBuf[:n]
+			} else {
+				ss.remainder = nil
+			}
+			ss.c.Write(ss.outBuf)
+			ss.outBuf = ss.outBuf[:0]
+			if lineOk {
+				return
+			}
+			continue
+		}
+	}
+	panic("unreachable")
+}
diff --git a/src/pkg/exp/terminal/shell_test.go b/src/pkg/exp/terminal/shell_test.go
new file mode 100644
index 0000000000..2bbe4a4f8f
--- /dev/null
+++ b/src/pkg/exp/terminal/shell_test.go
@@ -0,0 +1,110 @@
+// Copyright 2011 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 terminal
+
+import (
+	"testing"
+	"os"
+)
+
+type MockTerminal struct {
+	toSend       []byte
+	bytesPerRead int
+	received     []byte
+}
+
+func (c *MockTerminal) Read(data []byte) (n int, err os.Error) {
+	n = len(data)
+	if n == 0 {
+		return
+	}
+	if n > len(c.toSend) {
+		n = len(c.toSend)
+	}
+	if n == 0 {
+		return 0, os.EOF
+	}
+	if c.bytesPerRead > 0 && n > c.bytesPerRead {
+		n = c.bytesPerRead
+	}
+	copy(data, c.toSend[:n])
+	c.toSend = c.toSend[n:]
+	return
+}
+
+func (c *MockTerminal) Write(data []byte) (n int, err os.Error) {
+	c.received = append(c.received, data...)
+	return len(data), nil
+}
+
+func TestClose(t *testing.T) {
+	c := &MockTerminal{}
+	ss := NewShell(c, "> ")
+	line, err := ss.ReadLine()
+	if line != "" {
+		t.Errorf("Expected empty line but got: %s", line)
+	}
+	if err != os.EOF {
+		t.Errorf("Error should have been EOF but got: %s", err)
+	}
+}
+
+var keyPressTests = []struct {
+	in   string
+	line string
+	err  os.Error
+}{
+	{
+		"",
+		"",
+		os.EOF,
+	},
+	{
+		"\r",
+		"",
+		nil,
+	},
+	{
+		"foo\r",
+		"foo",
+		nil,
+	},
+	{
+		"a\x1b[Cb\r", // right
+		"ab",
+		nil,
+	},
+	{
+		"a\x1b[Db\r", // left
+		"ba",
+		nil,
+	},
+	{
+		"a\177b\r", // backspace
+		"b",
+		nil,
+	},
+}
+
+func TestKeyPresses(t *testing.T) {
+	for i, test := range keyPressTests {
+		for j := 0; j < len(test.in); j++ {
+			c := &MockTerminal{
+				toSend:       []byte(test.in),
+				bytesPerRead: j,
+			}
+			ss := NewShell(c, "> ")
+			line, err := ss.ReadLine()
+			if line != test.line {
+				t.Errorf("Line resulting from test %d (%d bytes per read) was '%s', expected '%s'", i, j, line, test.line)
+				break
+			}
+			if err != test.err {
+				t.Errorf("Error resulting from test %d (%d bytes per read) was '%v', expected '%v'", i, j, err, test.err)
+				break
+			}
+		}
+	}
+}
diff --git a/src/pkg/exp/terminal/terminal.go b/src/pkg/exp/terminal/terminal.go
new file mode 100644
index 0000000000..aacd90905f
--- /dev/null
+++ b/src/pkg/exp/terminal/terminal.go
@@ -0,0 +1,103 @@
+// Copyright 2011 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 terminal provides support functions for dealing with terminals, as
+// commonly found on UNIX systems.
+//
+// Putting a terminal into raw mode is the most common requirement:
+//
+// 	oldState, err := terminal.MakeRaw(0)
+// 	if err != nil {
+// 	        panic(err.String())
+// 	}
+// 	defer terminal.Restore(0, oldState)
+package terminal
+
+import (
+	"os"
+	"syscall"
+	"unsafe"
+)
+
+// State contains the state of a terminal.
+type State struct {
+	termios syscall.Termios
+}
+
+// IsTerminal returns true if the given file descriptor is a terminal.
+func IsTerminal(fd int) bool {
+	var termios syscall.Termios
+	_, _, e := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), uintptr(syscall.TCGETS), uintptr(unsafe.Pointer(&termios)), 0, 0, 0)
+	return e == 0
+}
+
+// MakeRaw put the terminal connected to the given file descriptor into raw
+// mode and returns the previous state of the terminal so that it can be
+// restored.
+func MakeRaw(fd int) (*State, os.Error) {
+	var oldState State
+	if _, _, e := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), uintptr(syscall.TCGETS), uintptr(unsafe.Pointer(&oldState.termios)), 0, 0, 0); e != 0 {
+		return nil, os.Errno(e)
+	}
+
+	newState := oldState.termios
+	newState.Iflag &^= syscall.ISTRIP | syscall.INLCR | syscall.ICRNL | syscall.IGNCR | syscall.IXON | syscall.IXOFF
+	newState.Lflag &^= syscall.ECHO | syscall.ICANON | syscall.ISIG
+	if _, _, e := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), uintptr(syscall.TCSETS), uintptr(unsafe.Pointer(&newState)), 0, 0, 0); e != 0 {
+		return nil, os.Errno(e)
+	}
+
+	return &oldState, nil
+}
+
+// Restore restores the terminal connected to the given file descriptor to a
+// previous state.
+func Restore(fd int, state *State) os.Error {
+	_, _, e := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), uintptr(syscall.TCSETS), uintptr(unsafe.Pointer(&state.termios)), 0, 0, 0)
+	return os.Errno(e)
+}
+
+// ReadPassword reads a line of input from a terminal without local echo.  This
+// is commonly used for inputting passwords and other sensitive data. The slice
+// returned does not include the \n.
+func ReadPassword(fd int) ([]byte, os.Error) {
+	var oldState syscall.Termios
+	if _, _, e := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), uintptr(syscall.TCGETS), uintptr(unsafe.Pointer(&oldState)), 0, 0, 0); e != 0 {
+		return nil, os.Errno(e)
+	}
+
+	newState := oldState
+	newState.Lflag &^= syscall.ECHO
+	if _, _, e := syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), uintptr(syscall.TCSETS), uintptr(unsafe.Pointer(&newState)), 0, 0, 0); e != 0 {
+		return nil, os.Errno(e)
+	}
+
+	defer func() {
+		syscall.Syscall6(syscall.SYS_IOCTL, uintptr(fd), uintptr(syscall.TCSETS), uintptr(unsafe.Pointer(&oldState)), 0, 0, 0)
+	}()
+
+	var buf [16]byte
+	var ret []byte
+	for {
+		n, errno := syscall.Read(fd, buf[:])
+		if errno != 0 {
+			return nil, os.Errno(errno)
+		}
+		if n == 0 {
+			if len(ret) == 0 {
+				return nil, os.EOF
+			}
+			break
+		}
+		if buf[n-1] == '\n' {
+			n--
+		}
+		ret = append(ret, buf[:n]...)
+		if n < len(buf) {
+			break
+		}
+	}
+
+	return ret, nil
+}
diff --git a/src/pkg/syscall/types_linux.c b/src/pkg/syscall/types_linux.c
index 8ede62fc1c..57a95daf3c 100644
--- a/src/pkg/syscall/types_linux.c
+++ b/src/pkg/syscall/types_linux.c
@@ -41,6 +41,7 @@ Input to godefs.  See also mkerrors.sh and mkall.sh
 #include <linux/filter.h>
 #include <linux/netlink.h>
 #include <linux/rtnetlink.h>
+#include <termios.h>
 #include <time.h>
 #include <unistd.h>
 #include <ustat.h>
@@ -288,3 +289,109 @@ struct my_epoll_event {
 };
 
 typedef struct my_epoll_event $EpollEvent;
+
+// Terminal handling
+
+typedef struct termios $Termios;
+
+enum {
+	$VINTR = VINTR,
+	$VQUIT = VQUIT,
+	$VERASE = VERASE,
+	$VKILL = VKILL,
+	$VEOF = VEOF,
+	$VTIME = VTIME,
+	$VMIN = VMIN,
+	$VSWTC = VSWTC,
+	$VSTART = VSTART,
+	$VSTOP = VSTOP,
+	$VSUSP = VSUSP,
+	$VEOL = VEOL,
+	$VREPRINT = VREPRINT,
+	$VDISCARD = VDISCARD,
+	$VWERASE = VWERASE,
+	$VLNEXT = VLNEXT,
+	$VEOL2 = VEOL2,
+	$IGNBRK = IGNBRK,
+	$BRKINT = BRKINT,
+	$IGNPAR = IGNPAR,
+	$PARMRK = PARMRK,
+	$INPCK = INPCK,
+	$ISTRIP = ISTRIP,
+	$INLCR = INLCR,
+	$IGNCR = IGNCR,
+	$ICRNL = ICRNL,
+	$IUCLC = IUCLC,
+	$IXON = IXON,
+	$IXANY = IXANY,
+	$IXOFF = IXOFF,
+	$IMAXBEL = IMAXBEL,
+	$IUTF8 = IUTF8,
+	$OPOST = OPOST,
+	$OLCUC = OLCUC,
+	$ONLCR = ONLCR,
+	$OCRNL = OCRNL,
+	$ONOCR = ONOCR,
+	$ONLRET = ONLRET,
+	$OFILL = OFILL,
+	$OFDEL = OFDEL,
+	$B0 = B0,
+	$B50 = B50,
+	$B75 = B75,
+	$B110 = B110,
+	$B134 = B134,
+	$B150 = B150,
+	$B200 = B200,
+	$B300 = B300,
+	$B600 = B600,
+	$B1200 = B1200,
+	$B1800 = B1800,
+	$B2400 = B2400,
+	$B4800 = B4800,
+	$B9600 = B9600,
+	$B19200 = B19200,
+	$B38400 = B38400,
+	$CSIZE = CSIZE,
+	$CS5 = CS5,
+	$CS6 = CS6,
+	$CS7 = CS7,
+	$CS8 = CS8,
+	$CSTOPB = CSTOPB,
+	$CREAD = CREAD,
+	$PARENB = PARENB,
+	$PARODD = PARODD,
+	$HUPCL = HUPCL,
+	$CLOCAL = CLOCAL,
+	$B57600 = B57600,
+	$B115200 = B115200,
+	$B230400 = B230400,
+	$B460800 = B460800,
+	$B500000 = B500000,
+	$B576000 = B576000,
+	$B921600 = B921600,
+	$B1000000 = B1000000,
+	$B1152000 = B1152000,
+	$B1500000 = B1500000,
+	$B2000000 = B2000000,
+	$B2500000 = B2500000,
+	$B3000000 = B3000000,
+	$B3500000 = B3500000,
+	$B4000000 = B4000000,
+	$ISIG = ISIG,
+	$ICANON = ICANON,
+	$XCASE = XCASE,
+	$ECHO = ECHO,
+	$ECHOE = ECHOE,
+	$ECHOK = ECHOK,
+	$ECHONL = ECHONL,
+	$NOFLSH = NOFLSH,
+	$TOSTOP = TOSTOP,
+	$ECHOCTL = ECHOCTL,
+	$ECHOPRT = ECHOPRT,
+	$ECHOKE = ECHOKE,
+	$FLUSHO = FLUSHO,
+	$PENDIN = PENDIN,
+	$IEXTEN = IEXTEN,
+	$TCGETS = TCGETS,
+	$TCSETS = TCSETS,
+};
diff --git a/src/pkg/syscall/ztypes_linux_amd64.go b/src/pkg/syscall/ztypes_linux_amd64.go
index 1ad4c8bfe6..add91306f0 100644
--- a/src/pkg/syscall/ztypes_linux_amd64.go
+++ b/src/pkg/syscall/ztypes_linux_amd64.go
@@ -105,6 +105,105 @@ const (
 	SizeofSockFilter        = 0x8
 	SizeofSockFprog         = 0x10
 	SizeofInotifyEvent      = 0x10
+	VINTR                   = 0
+	VQUIT                   = 0x1
+	VERASE                  = 0x2
+	VKILL                   = 0x3
+	VEOF                    = 0x4
+	VTIME                   = 0x5
+	VMIN                    = 0x6
+	VSWTC                   = 0x7
+	VSTART                  = 0x8
+	VSTOP                   = 0x9
+	VSUSP                   = 0xa
+	VEOL                    = 0xb
+	VREPRINT                = 0xc
+	VDISCARD                = 0xd
+	VWERASE                 = 0xe
+	VLNEXT                  = 0xf
+	VEOL2                   = 0x10
+	IGNBRK                  = 0x1
+	BRKINT                  = 0x2
+	IGNPAR                  = 0x4
+	PARMRK                  = 0x8
+	INPCK                   = 0x10
+	ISTRIP                  = 0x20
+	INLCR                   = 0x40
+	IGNCR                   = 0x80
+	ICRNL                   = 0x100
+	IUCLC                   = 0x200
+	IXON                    = 0x400
+	IXANY                   = 0x800
+	IXOFF                   = 0x1000
+	IMAXBEL                 = 0x2000
+	IUTF8                   = 0x4000
+	OPOST                   = 0x1
+	OLCUC                   = 0x2
+	ONLCR                   = 0x4
+	OCRNL                   = 0x8
+	ONOCR                   = 0x10
+	ONLRET                  = 0x20
+	OFILL                   = 0x40
+	OFDEL                   = 0x80
+	B0                      = 0
+	B50                     = 0x1
+	B75                     = 0x2
+	B110                    = 0x3
+	B134                    = 0x4
+	B150                    = 0x5
+	B200                    = 0x6
+	B300                    = 0x7
+	B600                    = 0x8
+	B1200                   = 0x9
+	B1800                   = 0xa
+	B2400                   = 0xb
+	B4800                   = 0xc
+	B9600                   = 0xd
+	B19200                  = 0xe
+	B38400                  = 0xf
+	CSIZE                   = 0x30
+	CS5                     = 0
+	CS6                     = 0x10
+	CS7                     = 0x20
+	CS8                     = 0x30
+	CSTOPB                  = 0x40
+	CREAD                   = 0x80
+	PARENB                  = 0x100
+	PARODD                  = 0x200
+	HUPCL                   = 0x400
+	CLOCAL                  = 0x800
+	B57600                  = 0x1001
+	B115200                 = 0x1002
+	B230400                 = 0x1003
+	B460800                 = 0x1004
+	B500000                 = 0x1005
+	B576000                 = 0x1006
+	B921600                 = 0x1007
+	B1000000                = 0x1008
+	B1152000                = 0x1009
+	B1500000                = 0x100a
+	B2000000                = 0x100b
+	B2500000                = 0x100c
+	B3000000                = 0x100d
+	B3500000                = 0x100e
+	B4000000                = 0x100f
+	ISIG                    = 0x1
+	ICANON                  = 0x2
+	XCASE                   = 0x4
+	ECHO                    = 0x8
+	ECHOE                   = 0x10
+	ECHOK                   = 0x20
+	ECHONL                  = 0x40
+	NOFLSH                  = 0x80
+	TOSTOP                  = 0x100
+	ECHOCTL                 = 0x200
+	ECHOPRT                 = 0x400
+	ECHOKE                  = 0x800
+	FLUSHO                  = 0x1000
+	PENDIN                  = 0x4000
+	IEXTEN                  = 0x8000
+	TCGETS                  = 0x5401
+	TCSETS                  = 0x5402
 )
 
 // Types
@@ -514,3 +613,15 @@ type EpollEvent struct {
 	Fd     int32
 	Pad    int32
 }
+
+type Termios struct {
+	Iflag        uint32
+	Oflag        uint32
+	Cflag        uint32
+	Lflag        uint32
+	Line         uint8
+	Cc           [32]uint8
+	Pad_godefs_0 [3]byte
+	Ispeed       uint32
+	Ospeed       uint32
+}