func (t *pty) open(cols, rows int) error {
var winp = new(C.struct_winsize)
winp.ws_col = C.ushort(cols)
winp.ws_row = C.ushort(rows)
winp.ws_xpixel = 0
winp.ws_ypixel = 0
var master, slave C.int
var name = make([]C.char, 40)
if ret := int(C.GoOpenpty(&master, &slave, &name[0], winp)); ret == -1 {
return errors.New("openpty(3) failed")
}
t.master = int(master)
t.slave = int(slave)
t.pty = C.GoString(&name[0])
if err := syscall.SetNonblock(t.master, true); err != nil {
return err
}
if err := syscall.SetNonblock(t.slave, true); err != nil {
return err
}
return nil
}
func makeCWindowSize(sz *WindowSize) C.struct_winsize {
var winsize C.struct_winsize
winsize.ws_row = C.ushort(sz.Rows)
winsize.ws_col = C.ushort(sz.Cols)
winsize.ws_xpixel = C.ushort(sz.PixelWidth)
winsize.ws_ypixel = C.ushort(sz.PixelHeight)
return winsize
}
func (t *pty) resize(cols, rows int) error {
var winp = new(C.struct_winsize)
winp.ws_col = C.ushort(cols)
winp.ws_row = C.ushort(rows)
winp.ws_xpixel = 0
winp.ws_ypixel = 0
if ret := int(C.GoResize(C.int(t.fd), winp)); ret == -1 {
return errors.New("ioctl(2) failed")
}
return nil
}
func (t *pty) fork(file string, args, env []string, cwd string, cols, rows, uid, gid int) error {
var winp = new(C.struct_winsize)
winp.ws_col = C.ushort(cols)
winp.ws_row = C.ushort(rows)
winp.ws_xpixel = 0
winp.ws_ypixel = 0
//fork the pty
var master C.int = -1
var name []C.char = make([]C.char, 40)
var pid C.int = C.GoForkpty(&master, &name[0], winp)
t.fd = int(master)
t.pid = int(pid)
t.pty = C.GoString(&name[0])
switch t.pid {
case -1:
return errors.New("forkpty(3) failed")
case 0:
if cwd != "" {
if err := syscall.Chdir(cwd); err != nil {
panic("chdir failed")
}
}
if uid != -1 && gid != -1 {
if err := syscall.Setgid(gid); err != nil {
panic("setgid failed")
}
if err := syscall.Setuid(uid); err != nil {
panic("setuid failed")
}
}
syscall.Exec(file, args, env)
panic("exec failed")
}
return nil
}
func setColsRows(winsz *C.struct_winsize, cols int, rows int) {
winsz.ws_row = C.ushort(rows)
winsz.ws_col = C.ushort(cols)
winsz.ws_xpixel = C.ushort(cols * 9)
winsz.ws_ypixel = C.ushort(rows * 16)
}