//go:build linux

package state

import (
	"errors"
	"os"
	"syscall"
)

func lockExclusive(f *os.File) error {
	err := syscall.Flock(int(f.Fd()), syscall.LOCK_EX|syscall.LOCK_NB)
	if errors.Is(err, syscall.EWOULDBLOCK) || errors.Is(err, syscall.EAGAIN) {
		return ErrBusy
	}
	return err
}

func syncDirectory(r *os.Root) error {
	f, err := r.Open(".")
	if err != nil {
		return err
	}
	defer f.Close()
	return f.Sync()
}