111 lines
2 KiB
Go
111 lines
2 KiB
Go
package console
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// #include <termios.h>
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import "C"
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import (
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"os"
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"syscall"
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"unsafe"
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)
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// NewPty creates a new pty pair
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// The master is returned as the first console and a string
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// with the path to the pty slave is returned as the second
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func NewPty() (Console, string, error) {
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f, err := os.OpenFile("/dev/ptmx", syscall.O_RDWR|syscall.O_NOCTTY|syscall.O_CLOEXEC, 0)
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if err != nil {
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return nil, "", err
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}
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if err := saneTerminal(f); err != nil {
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return nil, "", err
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}
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slave, err := ptsname(f)
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if err != nil {
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return nil, "", err
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}
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if err := unlockpt(f); err != nil {
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return nil, "", err
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}
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return &master{
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f: f,
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}, slave, nil
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}
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type master struct {
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f *os.File
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termios *syscall.Termios
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}
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func (m *master) Read(b []byte) (int, error) {
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return m.f.Read(b)
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}
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func (m *master) Write(b []byte) (int, error) {
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return m.f.Write(b)
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}
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func (m *master) Close() error {
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return m.f.Close()
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}
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func (m *master) Resize(ws WinSize) error {
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return ioctl(
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m.f.Fd(),
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uintptr(syscall.TIOCSWINSZ),
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uintptr(unsafe.Pointer(&ws)),
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)
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}
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func (m *master) ResizeFrom(c Console) error {
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ws, err := c.Size()
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if err != nil {
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return err
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}
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return m.Resize(ws)
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}
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func (m *master) Reset() error {
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if m.termios == nil {
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return nil
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}
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return tcset(m.f.Fd(), m.termios)
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}
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func (m *master) SetRaw() error {
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m.termios = &syscall.Termios{}
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if err := tcget(m.f.Fd(), m.termios); err != nil {
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return err
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}
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rawState := *m.termios
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C.cfmakeraw((*C.struct_termios)(unsafe.Pointer(&rawState)))
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rawState.Oflag = rawState.Oflag | C.OPOST
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return tcset(m.f.Fd(), &rawState)
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}
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func (m *master) Size() (WinSize, error) {
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var ws WinSize
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if err := ioctl(
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m.f.Fd(),
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uintptr(syscall.TIOCGWINSZ),
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uintptr(unsafe.Pointer(&ws)),
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); err != nil {
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return ws, err
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}
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return ws, nil
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}
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// checkConsole checks if the provided file is a console
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func checkConsole(f *os.File) error {
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var termios syscall.Termios
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if tcget(f.Fd(), &termios) != nil {
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return ErrNotAConsole
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}
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return nil
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}
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func newMaster(f *os.File) Console {
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return &master{
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f: f,
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}
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}
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