// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

//go:build go1.5

package plan9

import "syscall"

func fixwd() {
	syscall.Fixwd()
}

func Getwd() (wd string, err error) {
	return syscall.Getwd()
}

func Chdir(path string) error {
	return syscall.Chdir(path)

func Open(path string, mode int) (fd int, err error) {
	fixwd()
	return open(path, mode)
}

//sys	create(path string, mode int, perm uint32) (fd int, err error)

func Create(path string, mode int, perm uint32) (fd int, err error) {
	fixwd()
	return create(path, mode, perm)
}

//sys	remove(path string) (err error)

func Remove(path string) error {
	fixwd()
	return remove(path)
}

func Fixwd() {
	wdmu.Lock()
	defer wdmu.Unlock()
	fixwdLocked()
}

func fixwdLocked() {
	if !wdSet {
		return
	}
	// always call chdir when getwd returns an error
	wd, _ := getwd()
	if wd == wdStr {
		return
	}
	if err := chdir(wdStr); err != nil {
		return
	}
}

// If any of the paths is relative, call Fixwd and return true

func Open(path string, mode int) (fd int, err error) {
	if fixwd(path) {
		defer runtime.UnlockOSThread()
	}
	return open(path, mode)
}

//sys	create(path string, mode int, perm uint32) (fd int, err error)

func Create(path string, mode int, perm uint32) (fd int, err error) {
	if fixwd(path) {
		defer runtime.UnlockOSThread()
	}
	return create(path, mode, perm)
}

// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

//go:build !go1.5

package plan9

func fixwd() {
}

func Getwd() (wd string, err error) {
	fd, err := open(".", O_RDONLY)
	if err != nil {
		return "", err
	}
	defer Close(fd)
	return Fd2path(fd)
}

func Chdir(path string) error {
	return chdir(path)