mirror of https://github.com/docker/cli.git
65 lines
1.5 KiB
Go
65 lines
1.5 KiB
Go
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// +build !windows
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package pty
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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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// InheritSize applies the terminal size of pty to tty. This should be run
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// in a signal handler for syscall.SIGWINCH to automatically resize the tty when
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// the pty receives a window size change notification.
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func InheritSize(pty, tty *os.File) error {
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size, err := GetsizeFull(pty)
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if err != nil {
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return err
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}
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err = Setsize(tty, size)
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if 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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// Setsize resizes t to s.
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func Setsize(t *os.File, ws *Winsize) error {
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return windowRectCall(ws, t.Fd(), syscall.TIOCSWINSZ)
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}
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// GetsizeFull returns the full terminal size description.
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func GetsizeFull(t *os.File) (size *Winsize, err error) {
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var ws Winsize
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err = windowRectCall(&ws, t.Fd(), syscall.TIOCGWINSZ)
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return &ws, err
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}
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// Getsize returns the number of rows (lines) and cols (positions
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// in each line) in terminal t.
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func Getsize(t *os.File) (rows, cols int, err error) {
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ws, err := GetsizeFull(t)
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return int(ws.Rows), int(ws.Cols), err
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}
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// Winsize describes the terminal size.
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type Winsize struct {
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Rows uint16 // ws_row: Number of rows (in cells)
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Cols uint16 // ws_col: Number of columns (in cells)
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X uint16 // ws_xpixel: Width in pixels
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Y uint16 // ws_ypixel: Height in pixels
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}
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func windowRectCall(ws *Winsize, fd, a2 uintptr) error {
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_, _, errno := syscall.Syscall(
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syscall.SYS_IOCTL,
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fd,
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a2,
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uintptr(unsafe.Pointer(ws)),
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)
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if errno != 0 {
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return syscall.Errno(errno)
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}
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return nil
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}
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