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// Copyright 2013 Apcera Inc. All rights reserved.
// +build !windows
package term
import (
"errors"
"os"
"syscall"
"unsafe"
)
// ErrGetWinsizeFailed indicates that the system call to extract the size of
// a Unix tty from the kernel failed.
var ErrGetWinsizeFailed = errors.New("term: syscall.TIOCGWINSZ failed")
// GetTerminalWindowSize returns the terminal size maintained by the kernel
// for a Unix TTY, passed in as an *os.File. This information can be seen
// with the stty(1) command, and changes in size (eg, terminal emulator
// resized) should trigger a SIGWINCH signal delivery to the foreground process
// group at the time of the change, so a long-running process might reasonably
// watch for SIGWINCH and arrange to re-fetch the size when that happens.
func GetTerminalWindowSize(file *os.File) (*Size, error) {
// Based on source from from golang.org/x/crypto/ssh/terminal/util.go
var dimensions [4]uint16
if _, _, err := syscall.Syscall6(syscall.SYS_IOCTL, file.Fd(), uintptr(syscall.TIOCGWINSZ), uintptr(unsafe.Pointer(&dimensions)), 0, 0, 0); err != 0 {
return nil, err
}
return &Size{
Lines: int(dimensions[0]),
Columns: int(dimensions[1]),
}, nil
}
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