555 lines
10 KiB
Go
555 lines
10 KiB
Go
// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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//go:build js && wasm
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package syscall
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import (
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"errors"
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"sync"
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"syscall/js"
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)
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// Provided by package runtime.
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func now() (sec int64, nsec int32)
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var jsProcess = js.Global().Get("process")
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var jsFS = js.Global().Get("fs")
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var constants = jsFS.Get("constants")
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var uint8Array = js.Global().Get("Uint8Array")
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var (
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nodeWRONLY = constants.Get("O_WRONLY").Int()
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nodeRDWR = constants.Get("O_RDWR").Int()
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nodeCREATE = constants.Get("O_CREAT").Int()
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nodeTRUNC = constants.Get("O_TRUNC").Int()
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nodeAPPEND = constants.Get("O_APPEND").Int()
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nodeEXCL = constants.Get("O_EXCL").Int()
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)
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type jsFile struct {
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path string
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entries []string
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dirIdx int // entries[:dirIdx] have already been returned in ReadDirent
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pos int64
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seeked bool
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}
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var filesMu sync.Mutex
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var files = map[int]*jsFile{
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0: {},
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1: {},
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2: {},
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}
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func fdToFile(fd int) (*jsFile, error) {
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filesMu.Lock()
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f, ok := files[fd]
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filesMu.Unlock()
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if !ok {
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return nil, EBADF
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}
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return f, nil
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}
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func Open(path string, openmode int, perm uint32) (int, error) {
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if err := checkPath(path); err != nil {
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return 0, err
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}
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flags := 0
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if openmode&O_WRONLY != 0 {
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flags |= nodeWRONLY
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}
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if openmode&O_RDWR != 0 {
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flags |= nodeRDWR
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}
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if openmode&O_CREATE != 0 {
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flags |= nodeCREATE
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}
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if openmode&O_TRUNC != 0 {
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flags |= nodeTRUNC
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}
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if openmode&O_APPEND != 0 {
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flags |= nodeAPPEND
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}
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if openmode&O_EXCL != 0 {
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flags |= nodeEXCL
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}
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if openmode&O_SYNC != 0 {
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return 0, errors.New("syscall.Open: O_SYNC is not supported by js/wasm")
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}
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jsFD, err := fsCall("open", path, flags, perm)
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if err != nil {
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return 0, err
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}
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fd := jsFD.Int()
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var entries []string
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if stat, err := fsCall("fstat", fd); err == nil && stat.Call("isDirectory").Bool() {
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dir, err := fsCall("readdir", path)
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if err != nil {
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return 0, err
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}
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entries = make([]string, dir.Length())
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for i := range entries {
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entries[i] = dir.Index(i).String()
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}
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}
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if path[0] != '/' {
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cwd := jsProcess.Call("cwd").String()
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path = cwd + "/" + path
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}
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f := &jsFile{
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path: path,
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entries: entries,
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}
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filesMu.Lock()
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files[fd] = f
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filesMu.Unlock()
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return fd, nil
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}
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func Close(fd int) error {
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filesMu.Lock()
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delete(files, fd)
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filesMu.Unlock()
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_, err := fsCall("close", fd)
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return err
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}
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func CloseOnExec(fd int) {
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// nothing to do - no exec
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}
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func Mkdir(path string, perm uint32) error {
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if err := checkPath(path); err != nil {
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return err
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}
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_, err := fsCall("mkdir", path, perm)
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return err
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}
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func ReadDirent(fd int, buf []byte) (int, error) {
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f, err := fdToFile(fd)
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if err != nil {
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return 0, err
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}
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if f.entries == nil {
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return 0, EINVAL
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}
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n := 0
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for f.dirIdx < len(f.entries) {
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entry := f.entries[f.dirIdx]
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l := 2 + len(entry)
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if l > len(buf) {
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break
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}
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buf[0] = byte(l)
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buf[1] = byte(l >> 8)
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copy(buf[2:], entry)
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buf = buf[l:]
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n += l
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f.dirIdx++
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}
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return n, nil
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}
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func setStat(st *Stat_t, jsSt js.Value) {
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st.Dev = int64(jsSt.Get("dev").Int())
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st.Ino = uint64(jsSt.Get("ino").Int())
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st.Mode = uint32(jsSt.Get("mode").Int())
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st.Nlink = uint32(jsSt.Get("nlink").Int())
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st.Uid = uint32(jsSt.Get("uid").Int())
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st.Gid = uint32(jsSt.Get("gid").Int())
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st.Rdev = int64(jsSt.Get("rdev").Int())
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st.Size = int64(jsSt.Get("size").Int())
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st.Blksize = int32(jsSt.Get("blksize").Int())
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st.Blocks = int32(jsSt.Get("blocks").Int())
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atime := int64(jsSt.Get("atimeMs").Int())
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st.Atime = atime / 1000
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st.AtimeNsec = (atime % 1000) * 1000000
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mtime := int64(jsSt.Get("mtimeMs").Int())
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st.Mtime = mtime / 1000
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st.MtimeNsec = (mtime % 1000) * 1000000
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ctime := int64(jsSt.Get("ctimeMs").Int())
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st.Ctime = ctime / 1000
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st.CtimeNsec = (ctime % 1000) * 1000000
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}
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func Stat(path string, st *Stat_t) error {
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if err := checkPath(path); err != nil {
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return err
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}
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jsSt, err := fsCall("stat", path)
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if err != nil {
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return err
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}
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setStat(st, jsSt)
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return nil
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}
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func Lstat(path string, st *Stat_t) error {
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if err := checkPath(path); err != nil {
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return err
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}
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jsSt, err := fsCall("lstat", path)
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if err != nil {
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return err
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}
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setStat(st, jsSt)
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return nil
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}
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func Fstat(fd int, st *Stat_t) error {
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jsSt, err := fsCall("fstat", fd)
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if err != nil {
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return err
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}
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setStat(st, jsSt)
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return nil
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}
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func Unlink(path string) error {
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if err := checkPath(path); err != nil {
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return err
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}
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_, err := fsCall("unlink", path)
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return err
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}
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func Rmdir(path string) error {
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if err := checkPath(path); err != nil {
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return err
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}
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_, err := fsCall("rmdir", path)
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return err
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}
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func Chmod(path string, mode uint32) error {
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if err := checkPath(path); err != nil {
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return err
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}
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_, err := fsCall("chmod", path, mode)
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return err
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}
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func Fchmod(fd int, mode uint32) error {
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_, err := fsCall("fchmod", fd, mode)
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return err
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}
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func Chown(path string, uid, gid int) error {
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if err := checkPath(path); err != nil {
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return err
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}
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_, err := fsCall("chown", path, uint32(uid), uint32(gid))
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return err
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}
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func Fchown(fd int, uid, gid int) error {
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_, err := fsCall("fchown", fd, uint32(uid), uint32(gid))
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return err
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}
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func Lchown(path string, uid, gid int) error {
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if err := checkPath(path); err != nil {
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return err
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}
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if jsFS.Get("lchown").IsUndefined() {
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// fs.lchown is unavailable on Linux until Node.js 10.6.0
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// TODO(neelance): remove when we require at least this Node.js version
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return ENOSYS
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}
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_, err := fsCall("lchown", path, uint32(uid), uint32(gid))
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return err
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}
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func UtimesNano(path string, ts []Timespec) error {
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if err := checkPath(path); err != nil {
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return err
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}
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if len(ts) != 2 {
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return EINVAL
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}
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atime := ts[0].Sec
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mtime := ts[1].Sec
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_, err := fsCall("utimes", path, atime, mtime)
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return err
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}
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func Rename(from, to string) error {
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if err := checkPath(from); err != nil {
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return err
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}
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if err := checkPath(to); err != nil {
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return err
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}
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_, err := fsCall("rename", from, to)
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return err
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}
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func Truncate(path string, length int64) error {
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if err := checkPath(path); err != nil {
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return err
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}
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_, err := fsCall("truncate", path, length)
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return err
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}
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func Ftruncate(fd int, length int64) error {
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_, err := fsCall("ftruncate", fd, length)
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return err
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}
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func Getcwd(buf []byte) (n int, err error) {
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defer recoverErr(&err)
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cwd := jsProcess.Call("cwd").String()
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n = copy(buf, cwd)
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return
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}
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func Chdir(path string) (err error) {
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if err := checkPath(path); err != nil {
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return err
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}
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defer recoverErr(&err)
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jsProcess.Call("chdir", path)
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return
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}
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func Fchdir(fd int) error {
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f, err := fdToFile(fd)
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if err != nil {
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return err
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}
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return Chdir(f.path)
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}
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func Readlink(path string, buf []byte) (n int, err error) {
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if err := checkPath(path); err != nil {
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return 0, err
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}
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dst, err := fsCall("readlink", path)
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if err != nil {
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return 0, err
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}
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n = copy(buf, dst.String())
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return n, nil
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}
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func Link(path, link string) error {
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if err := checkPath(path); err != nil {
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return err
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}
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if err := checkPath(link); err != nil {
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return err
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}
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_, err := fsCall("link", path, link)
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return err
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}
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func Symlink(path, link string) error {
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if err := checkPath(path); err != nil {
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return err
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}
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if err := checkPath(link); err != nil {
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return err
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}
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_, err := fsCall("symlink", path, link)
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return err
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}
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func Fsync(fd int) error {
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_, err := fsCall("fsync", fd)
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return err
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}
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func Read(fd int, b []byte) (int, error) {
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f, err := fdToFile(fd)
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if err != nil {
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return 0, err
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}
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if f.seeked {
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n, err := Pread(fd, b, f.pos)
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f.pos += int64(n)
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return n, err
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}
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buf := uint8Array.New(len(b))
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n, err := fsCall("read", fd, buf, 0, len(b), nil)
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if err != nil {
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return 0, err
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}
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js.CopyBytesToGo(b, buf)
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n2 := n.Int()
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f.pos += int64(n2)
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return n2, err
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}
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func Write(fd int, b []byte) (int, error) {
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f, err := fdToFile(fd)
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if err != nil {
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return 0, err
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}
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if f.seeked {
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n, err := Pwrite(fd, b, f.pos)
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f.pos += int64(n)
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return n, err
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}
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if faketime && (fd == 1 || fd == 2) {
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n := faketimeWrite(fd, b)
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if n < 0 {
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return 0, errnoErr(Errno(-n))
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}
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return n, nil
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}
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buf := uint8Array.New(len(b))
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js.CopyBytesToJS(buf, b)
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n, err := fsCall("write", fd, buf, 0, len(b), nil)
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if err != nil {
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return 0, err
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}
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n2 := n.Int()
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f.pos += int64(n2)
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return n2, err
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}
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func Pread(fd int, b []byte, offset int64) (int, error) {
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buf := uint8Array.New(len(b))
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n, err := fsCall("read", fd, buf, 0, len(b), offset)
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if err != nil {
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return 0, err
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}
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js.CopyBytesToGo(b, buf)
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return n.Int(), nil
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}
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func Pwrite(fd int, b []byte, offset int64) (int, error) {
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buf := uint8Array.New(len(b))
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js.CopyBytesToJS(buf, b)
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n, err := fsCall("write", fd, buf, 0, len(b), offset)
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if err != nil {
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return 0, err
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}
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return n.Int(), nil
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}
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func Seek(fd int, offset int64, whence int) (int64, error) {
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f, err := fdToFile(fd)
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if err != nil {
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return 0, err
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}
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var newPos int64
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switch whence {
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case 0:
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newPos = offset
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case 1:
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newPos = f.pos + offset
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case 2:
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var st Stat_t
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if err := Fstat(fd, &st); err != nil {
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return 0, err
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}
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newPos = st.Size + offset
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default:
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return 0, errnoErr(EINVAL)
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}
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if newPos < 0 {
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return 0, errnoErr(EINVAL)
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}
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f.seeked = true
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f.dirIdx = 0 // Reset directory read position. See issue 35767.
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f.pos = newPos
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return newPos, nil
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}
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func Dup(fd int) (int, error) {
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return 0, ENOSYS
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}
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func Dup2(fd, newfd int) error {
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return ENOSYS
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}
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func Pipe(fd []int) error {
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return ENOSYS
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}
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func fsCall(name string, args ...any) (js.Value, error) {
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type callResult struct {
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val js.Value
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err error
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}
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c := make(chan callResult, 1)
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f := js.FuncOf(func(this js.Value, args []js.Value) any {
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var res callResult
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if len(args) >= 1 { // on Node.js 8, fs.utimes calls the callback without any arguments
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if jsErr := args[0]; !jsErr.IsNull() {
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res.err = mapJSError(jsErr)
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}
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}
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res.val = js.Undefined()
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if len(args) >= 2 {
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res.val = args[1]
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}
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c <- res
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return nil
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})
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defer f.Release()
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jsFS.Call(name, append(args, f)...)
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res := <-c
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return res.val, res.err
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}
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// checkPath checks that the path is not empty and that it contains no null characters.
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func checkPath(path string) error {
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if path == "" {
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return EINVAL
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}
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for i := 0; i < len(path); i++ {
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if path[i] == '\x00' {
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return EINVAL
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}
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}
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return nil
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}
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func recoverErr(errPtr *error) {
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if err := recover(); err != nil {
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jsErr, ok := err.(js.Error)
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if !ok {
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panic(err)
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}
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*errPtr = mapJSError(jsErr.Value)
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}
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}
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// mapJSError maps an error given by Node.js to the appropriate Go error
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func mapJSError(jsErr js.Value) error {
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errno, ok := errnoByCode[jsErr.Get("code").String()]
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if !ok {
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panic(jsErr)
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}
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return errnoErr(Errno(errno))
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}
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