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package pty
import (
"bytes"
"os"
"syscall"
"unsafe"
)
func ptyName(f *os.File) (string, error) {
// Parameter length is encoded in the low 13 bits of the top word.
// See https://github.com/apple/darwin-xnu/blob/2ff845c2e0/bsd/sys/ioccom.h#L69-L77
const IOCPARM_MASK = 0x1fff
const TIOCPTYGNAME_PARM_LEN = (syscall.TIOCPTYGNAME >> 16) & IOCPARM_MASK
out := make([]byte, TIOCPTYGNAME_PARM_LEN)
err := ioctl(f, "TIOCPTYGNAME", syscall.TIOCPTYGNAME, uintptr(unsafe.Pointer(&out[0])))
if err != nil {
return "", err
}
i := bytes.IndexByte(out, 0x00)
return string(out[:i]), nil
}
func ptyGrant(f *os.File) error {
return ioctl(f, "TIOCPTYGRANT", syscall.TIOCPTYGRANT, 0)
}
func ptyUnlock(f *os.File) error {
return ioctl(f, "TIOCPTYUNLK", syscall.TIOCPTYUNLK, 0)
}
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