// Copyright (c) 2026 Lark Technologies Pte. Ltd.
// SPDX-License-Identifier: MIT

//go:build !windows

package lockfile

import (
	"fmt"
	"os"
	"syscall"
)

func tryLockFile(f *os.File) error {
	err := syscall.Flock(int(f.Fd()), syscall.LOCK_EX|syscall.LOCK_NB)
	if err != nil {
		return fmt.Errorf("%w (lock: %s, syscall: %v)", ErrHeld, f.Name(), err)
	}
	return nil
}

func unlockFile(f *os.File) error {
	return syscall.Flock(int(f.Fd()), syscall.LOCK_UN)
}