// Fenrir console screen reader.
// Copyright (c) 2026 Storm Dragon
// SPDX-License-Identifier: GPL-3.0-or-later
//
// This program is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation, either version 3 of the License, or (at your option)
// any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
// more details.
//
// You should have received a copy of the GNU General Public License along with
// this program. If not, see <https://www.gnu.org/licenses/gpl-3.0.html>.

//go:build linux && cgo

package console

import "syscall"

// Include ctime so a recreated node, permission change or reused inode causes
// another probe. Do not include atime: probing itself can change it.
type deviceIdentity struct {
	device, inode, rdev uint64
	changed             syscall.Timespec
}

func identity_from_stat(stat *syscall.Stat_t) deviceIdentity {
	return deviceIdentity{device: uint64(stat.Dev), inode: stat.Ino, rdev: uint64(stat.Rdev), changed: stat.Ctim}
}

func device_identity(path string) (deviceIdentity, error) {
	var stat syscall.Stat_t
	err := syscall.Stat(path, &stat)
	return identity_from_stat(&stat), err
}