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package xpty
import (
"os"
"os/exec"
"github.com/creack/pty"
)
// UnixPty represents a classic Unix PTY (pseudo-terminal).
type UnixPty struct {
master, slave *os.File
}
var _ Pty = &UnixPty{}
// NewUnixPty creates a new Unix PTY.
func NewUnixPty(width, height int, _ ...PtyOption) (*UnixPty, error) {
ptm, pts, err := pty.Open()
if err != nil {
return nil, err
}
p := &UnixPty{
master: ptm,
slave: pts,
}
if width >= 0 && height >= 0 {
if err := p.Resize(width, height); err != nil {
return nil, err
}
}
return p, nil
}
// Close implements XPTY.
func (p *UnixPty) Close() (err error) {
defer func() {
serr := p.slave.Close()
if err == nil {
err = serr
}
}()
if err := p.master.Close(); err != nil {
return err
}
return
}
// Fd implements XPTY.
func (p *UnixPty) Fd() uintptr {
return p.master.Fd()
}
// Name implements XPTY.
func (p *UnixPty) Name() string {
return p.master.Name()
}
// SlaveName returns the name of the slave PTY.
// This is usually used for remote sessions to identify the running TTY. You
// can find this in SSH sessions defined as $SSH_TTY.
func (p *UnixPty) SlaveName() string {
return p.slave.Name()
}
// Read implements XPTY.
func (p *UnixPty) Read(b []byte) (n int, err error) {
return p.master.Read(b)
}
// Resize implements XPTY.
func (p *UnixPty) Resize(width int, height int) (err error) {
return p.setWinsize(width, height, 0, 0)
}
// SetWinsize sets window size for the PTY.
func (p *UnixPty) SetWinsize(width, height, x, y int) error {
return p.setWinsize(width, height, x, y)
}
// Size returns the size of the PTY.
func (p *UnixPty) Size() (width, height int, err error) {
return p.size()
}
// Start implements XPTY.
func (p *UnixPty) Start(c *exec.Cmd) error {
if c.Stdout == nil {
c.Stdout = p.slave
}
if c.Stderr == nil {
c.Stderr = p.slave
}
if c.Stdin == nil {
c.Stdin = p.slave
}
if err := c.Start(); err != nil {
return err
}
return nil
}
// Write implements XPTY.
func (p *UnixPty) Write(b []byte) (n int, err error) {
return p.master.Write(b)
}
// Master returns the master end of the PTY.
func (p *UnixPty) Master() *os.File {
return p.master
}
// Slave returns the slave end of the PTY.
func (p *UnixPty) Slave() *os.File {
return p.slave
}
// Control runs the given function with the file descriptor of the master PTY.
func (p *UnixPty) Control(fn func(fd uintptr)) error {
conn, err := p.master.SyscallConn()
if err != nil {
return err
}
return conn.Control(fn)
}
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