bbbe67bf7c
* Vendors packages * Adds a Makefile that uses docker to build a static binary against musl using alpine linux. Signed-off-by: Gabriel Adrian Samfira <gsamfira@cloudbasesolutions.com>
79 lines
2 KiB
Go
79 lines
2 KiB
Go
//go:build linux
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package termios
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import (
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"golang.org/x/sys/unix"
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)
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const ioctlReadTermios = unix.TCGETS
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const ioctlWriteTermios = unix.TCSETS
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// State contains the state of a terminal.
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type State struct {
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Termios unix.Termios
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}
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// IsTerminal returns true if the given file descriptor is a terminal.
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func IsTerminal(fd int) bool {
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_, err := GetState(fd)
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return err == nil
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}
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// GetState returns the current state of a terminal which may be useful to restore the terminal after a signal.
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func GetState(fd int) (*State, error) {
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termios, err := unix.IoctlGetTermios(fd, ioctlReadTermios)
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if err != nil {
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return nil, err
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}
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state := State{}
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state.Termios = *termios
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return &state, nil
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}
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// GetSize returns the dimensions of the given terminal.
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func GetSize(fd int) (int, int, error) {
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winsize, err := unix.IoctlGetWinsize(fd, unix.TIOCGWINSZ)
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if err != nil {
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return -1, -1, err
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}
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return int(winsize.Col), int(winsize.Row), nil
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}
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// 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.
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func MakeRaw(fd int) (*State, error) {
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oldState, err := GetState(fd)
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if err != nil {
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return nil, err
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}
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newState := *oldState
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// This attempts to replicate the behaviour documented for cfmakeraw in the termios(3) manpage.
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newState.Termios.Iflag &^= unix.BRKINT | unix.ICRNL | unix.INPCK | unix.ISTRIP | unix.IXON
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newState.Termios.Oflag &^= unix.OPOST
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newState.Termios.Cflag &^= unix.CSIZE | unix.PARENB
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newState.Termios.Cflag |= unix.CS8
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newState.Termios.Lflag &^= unix.ECHO | unix.ICANON | unix.IEXTEN | unix.ISIG
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newState.Termios.Cc[unix.VMIN] = 1
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newState.Termios.Cc[unix.VTIME] = 0
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err = Restore(fd, &newState)
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if err != nil {
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return nil, err
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}
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return oldState, nil
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}
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// Restore restores the terminal connected to the given file descriptor to a previous state.
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func Restore(fd int, state *State) error {
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if err := unix.IoctlSetTermios(fd, ioctlWriteTermios, &state.Termios); err != nil {
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return err
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}
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return nil
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}
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