1 files changed, 344 insertions, 0 deletions
diff --git a/pkg/abi/linux/tty.go b/pkg/abi/linux/tty.go
new file mode 100644
index 000000000..8ac02aee8
--- /dev/null
+++ b/pkg/abi/linux/tty.go
@@ -0,0 +1,344 @@
+// Copyright 2018 The gVisor Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package linux
+
+const (
+	// NumControlCharacters is the number of control characters in Termios.
+	NumControlCharacters = 19
+	// disabledChar is used to indicate that a control character is
+	// disabled.
+	disabledChar = 0
+)
+
+// Winsize is struct winsize, defined in uapi/asm-generic/termios.h.
+type Winsize struct {
+	Row    uint16
+	Col    uint16
+	Xpixel uint16
+	Ypixel uint16
+}
+
+// Termios is struct termios, defined in uapi/asm-generic/termbits.h.
+type Termios struct {
+	InputFlags        uint32
+	OutputFlags       uint32
+	ControlFlags      uint32
+	LocalFlags        uint32
+	LineDiscipline    uint8
+	ControlCharacters [NumControlCharacters]uint8
+}
+
+// KernelTermios is struct ktermios/struct termios2, defined in
+// uapi/asm-generic/termbits.h.
+//
+// +stateify savable
+type KernelTermios struct {
+	InputFlags        uint32
+	OutputFlags       uint32
+	ControlFlags      uint32
+	LocalFlags        uint32
+	LineDiscipline    uint8
+	ControlCharacters [NumControlCharacters]uint8
+	InputSpeed        uint32
+	OutputSpeed       uint32
+}
+
+// IEnabled returns whether flag is enabled in termios input flags.
+func (t *KernelTermios) IEnabled(flag uint32) bool {
+	return t.InputFlags&flag == flag
+}
+
+// OEnabled returns whether flag is enabled in termios output flags.
+func (t *KernelTermios) OEnabled(flag uint32) bool {
+	return t.OutputFlags&flag == flag
+}
+
+// CEnabled returns whether flag is enabled in termios control flags.
+func (t *KernelTermios) CEnabled(flag uint32) bool {
+	return t.ControlFlags&flag == flag
+}
+
+// LEnabled returns whether flag is enabled in termios local flags.
+func (t *KernelTermios) LEnabled(flag uint32) bool {
+	return t.LocalFlags&flag == flag
+}
+
+// ToTermios copies fields that are shared with Termios into a new Termios
+// struct.
+func (t *KernelTermios) ToTermios() Termios {
+	return Termios{
+		InputFlags:        t.InputFlags,
+		OutputFlags:       t.OutputFlags,
+		ControlFlags:      t.ControlFlags,
+		LocalFlags:        t.LocalFlags,
+		LineDiscipline:    t.LineDiscipline,
+		ControlCharacters: t.ControlCharacters,
+	}
+}
+
+// FromTermios copies fields that are shared with Termios into this
+// KernelTermios struct.
+func (t *KernelTermios) FromTermios(term Termios) {
+	t.InputFlags = term.InputFlags
+	t.OutputFlags = term.OutputFlags
+	t.ControlFlags = term.ControlFlags
+	t.LocalFlags = term.LocalFlags
+	t.LineDiscipline = term.LineDiscipline
+	t.ControlCharacters = term.ControlCharacters
+}
+
+// IsTerminating returns whether c is a line terminating character.
+func (t *KernelTermios) IsTerminating(cBytes []byte) bool {
+	// All terminating characters are 1 byte.
+	if len(cBytes) != 1 {
+		return false
+	}
+	c := cBytes[0]
+
+	// Is this the user-set EOF character?
+	if t.IsEOF(c) {
+		return true
+	}
+
+	switch c {
+	case disabledChar:
+		return false
+	case '\n', t.ControlCharacters[VEOL]:
+		return true
+	case t.ControlCharacters[VEOL2]:
+		return t.LEnabled(IEXTEN)
+	}
+	return false
+}
+
+// IsEOF returns whether c is the EOF character.
+func (t *KernelTermios) IsEOF(c byte) bool {
+	return c == t.ControlCharacters[VEOF] && t.ControlCharacters[VEOF] != disabledChar
+}
+
+// Input flags.
+const (
+	IGNBRK  = 0000001
+	BRKINT  = 0000002
+	IGNPAR  = 0000004
+	PARMRK  = 0000010
+	INPCK   = 0000020
+	ISTRIP  = 0000040
+	INLCR   = 0000100
+	IGNCR   = 0000200
+	ICRNL   = 0000400
+	IUCLC   = 0001000
+	IXON    = 0002000
+	IXANY   = 0004000
+	IXOFF   = 0010000
+	IMAXBEL = 0020000
+	IUTF8   = 0040000
+)
+
+// Output flags.
+const (
+	OPOST  = 0000001
+	OLCUC  = 0000002
+	ONLCR  = 0000004
+	OCRNL  = 0000010
+	ONOCR  = 0000020
+	ONLRET = 0000040
+	OFILL  = 0000100
+	OFDEL  = 0000200
+	NLDLY  = 0000400
+	NL0    = 0000000
+	NL1    = 0000400
+	CRDLY  = 0003000
+	CR0    = 0000000
+	CR1    = 0001000
+	CR2    = 0002000
+	CR3    = 0003000
+	TABDLY = 0014000
+	TAB0   = 0000000
+	TAB1   = 0004000
+	TAB2   = 0010000
+	TAB3   = 0014000
+	XTABS  = 0014000
+	BSDLY  = 0020000
+	BS0    = 0000000
+	BS1    = 0020000
+	VTDLY  = 0040000
+	VT0    = 0000000
+	VT1    = 0040000
+	FFDLY  = 0100000
+	FF0    = 0000000
+	FF1    = 0100000
+)
+
+// Control flags.
+const (
+	CBAUD    = 0010017
+	B0       = 0000000
+	B50      = 0000001
+	B75      = 0000002
+	B110     = 0000003
+	B134     = 0000004
+	B150     = 0000005
+	B200     = 0000006
+	B300     = 0000007
+	B600     = 0000010
+	B1200    = 0000011
+	B1800    = 0000012
+	B2400    = 0000013
+	B4800    = 0000014
+	B9600    = 0000015
+	B19200   = 0000016
+	B38400   = 0000017
+	EXTA     = B19200
+	EXTB     = B38400
+	CSIZE    = 0000060
+	CS5      = 0000000
+	CS6      = 0000020
+	CS7      = 0000040
+	CS8      = 0000060
+	CSTOPB   = 0000100
+	CREAD    = 0000200
+	PARENB   = 0000400
+	PARODD   = 0001000
+	HUPCL    = 0002000
+	CLOCAL   = 0004000
+	CBAUDEX  = 0010000
+	BOTHER   = 0010000
+	B57600   = 0010001
+	B115200  = 0010002
+	B230400  = 0010003
+	B460800  = 0010004
+	B500000  = 0010005
+	B576000  = 0010006
+	B921600  = 0010007
+	B1000000 = 0010010
+	B1152000 = 0010011
+	B1500000 = 0010012
+	B2000000 = 0010013
+	B2500000 = 0010014
+	B3000000 = 0010015
+	B3500000 = 0010016
+	B4000000 = 0010017
+	CIBAUD   = 002003600000
+	CMSPAR   = 010000000000
+	CRTSCTS  = 020000000000
+
+	// IBSHIFT is the shift from CBAUD to CIBAUD.
+	IBSHIFT = 16
+)
+
+// Local flags.
+const (
+	ISIG    = 0000001
+	ICANON  = 0000002
+	XCASE   = 0000004
+	ECHO    = 0000010
+	ECHOE   = 0000020
+	ECHOK   = 0000040
+	ECHONL  = 0000100
+	NOFLSH  = 0000200
+	TOSTOP  = 0000400
+	ECHOCTL = 0001000
+	ECHOPRT = 0002000
+	ECHOKE  = 0004000
+	FLUSHO  = 0010000
+	PENDIN  = 0040000
+	IEXTEN  = 0100000
+	EXTPROC = 0200000
+)
+
+// Control Character indices.
+const (
+	VINTR    = 0
+	VQUIT    = 1
+	VERASE   = 2
+	VKILL    = 3
+	VEOF     = 4
+	VTIME    = 5
+	VMIN     = 6
+	VSWTC    = 7
+	VSTART   = 8
+	VSTOP    = 9
+	VSUSP    = 10
+	VEOL     = 11
+	VREPRINT = 12
+	VDISCARD = 13
+	VWERASE  = 14
+	VLNEXT   = 15
+	VEOL2    = 16
+)
+
+// ControlCharacter returns the termios-style control character for the passed
+// character.
+//
+// e.g., for Ctrl-C, i.e., ^C, call ControlCharacter('C').
+//
+// Standard control characters are ASCII bytes 0 through 31.
+func ControlCharacter(c byte) uint8 {
+	// A is 1, B is 2, etc.
+	return uint8(c - 'A' + 1)
+}
+
+// DefaultControlCharacters is the default set of Termios control characters.
+var DefaultControlCharacters = [NumControlCharacters]uint8{
+	ControlCharacter('C'),  // VINTR = ^C
+	ControlCharacter('\\'), // VQUIT = ^\
+	'\x7f',                 // VERASE = DEL
+	ControlCharacter('U'),  // VKILL = ^U
+	ControlCharacter('D'),  // VEOF = ^D
+	0,                      // VTIME
+	1,                      // VMIN
+	0,                      // VSWTC
+	ControlCharacter('Q'),  // VSTART = ^Q
+	ControlCharacter('S'),  // VSTOP = ^S
+	ControlCharacter('Z'),  // VSUSP = ^Z
+	0,                      // VEOL
+	ControlCharacter('R'),  // VREPRINT = ^R
+	ControlCharacter('O'),  // VDISCARD = ^O
+	ControlCharacter('W'),  // VWERASE = ^W
+	ControlCharacter('V'),  // VLNEXT = ^V
+	0,                      // VEOL2
+}
+
+// MasterTermios is the terminal configuration of the master end of a Unix98
+// pseudoterminal.
+var MasterTermios = KernelTermios{
+	ControlFlags:      B38400 | CS8 | CREAD,
+	ControlCharacters: DefaultControlCharacters,
+	InputSpeed:        38400,
+	OutputSpeed:       38400,
+}
+
+// DefaultSlaveTermios is the default terminal configuration of the slave end
+// of a Unix98 pseudoterminal.
+var DefaultSlaveTermios = KernelTermios{
+	InputFlags:        ICRNL | IXON,
+	OutputFlags:       OPOST | ONLCR,
+	ControlFlags:      B38400 | CS8 | CREAD,
+	LocalFlags:        ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOKE | IEXTEN,
+	ControlCharacters: DefaultControlCharacters,
+	InputSpeed:        38400,
+	OutputSpeed:       38400,
+}
+
+// WindowSize corresponds to struct winsize defined in
+// include/uapi/asm-generic/termios.h.
+//
+// +stateify savable
+type WindowSize struct {
+	Rows uint16
+	Cols uint16
+	_    [4]byte // Padding for 2 unused shorts.
+}