// license that can be found in the LICENSE file.

//go:build aix || dragonfly || freebsd || linux || netbsd || openbsd

package unix

// ReadDirent reads directory entries from fd and writes them into buf.
func ReadDirent(fd int, buf []byte) (n int, err error) {
	return Getdents(fd, buf)

	}
	defer syscall.Close(fd)

	buf := bytes.Repeat([]byte{0xCD}, direntBufSize)
	for {
		n, err := syscall.ReadDirent(fd, buf)
		if err == syscall.EINVAL {
			// On linux, 'man getdents64' says that EINVAL indicates “result buffer is too small”.
			// Try a bigger buffer.
			t.Logf("ReadDirent: %v; retrying with larger buffer", err)
			buf = bytes.Repeat([]byte{0xCD}, len(buf)*2)
			continue
		}
		if err != nil {

	defer fd.decref()
	return syscall.Fchdir(fd.Sysfd)
}

// ReadDirent wraps syscall.ReadDirent.
// We treat this like an ordinary system call rather than a call
// that tries to fill the buffer.
func (fd *FD) ReadDirent(buf []byte) (int, error) {
	if err := fd.incref(); err != nil {
		return 0, err
	}
	defer fd.decref()
	for {
		n, err := ignoringEINTRIO(syscall.ReadDirent, fd.Sysfd, buf)
		if err != nil {
			n = 0

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

//go:build darwin || zos

package unix

import "unsafe"

// ReadDirent reads directory entries from fd and writes them into buf.
func ReadDirent(fd int, buf []byte) (n int, err error) {
	// Final argument is (basep *uintptr) and the syscall doesn't take nil.
	// 64 bits should be enough. (32 bits isn't even on 386). Since the

		n = -1
	}

	for n != 0 {
		// Refill the buffer if necessary
		if d.bufp >= d.nbuf {
			d.bufp = 0
			var errno error
			d.nbuf, errno = f.pfd.ReadDirent(*d.buf)
			runtime.KeepAlive(f)
			if errno != nil {
				return names, dirents, infos, &PathError{Op: "readdirent", Path: f.name, Err: errno}
			}
			if d.nbuf <= 0 {
				// Optimization: we can return the buffer to the pool, there is nothing else to read.

		// Do not call eofError; caller does not expect to see io.EOF.
		return n, err
	}
}

func (fd *FD) ReadDirent(buf []byte) (int, error) {
	n, err := fd.ReadDir(buf, fd.Dircookie)
	if err != nil {
		return 0, err
	}
	if n <= 0 {
		return n, nil // EOF
	}

	// We assume that the caller of ReadDirent will consume the entire buffer
	// up to the last full entry, so we scan through the buffer looking for the

	if err != nil {
		return consumed, nil, typ, err
	}

	return consumed, nameBuf[:nameLen], typ, nil
}

// readDirFn applies the fn() function on each entries at dirPath, doesn't recurse into
// the directory itself, if the dirPath doesn't exist this function doesn't return
// an error.
func readDirFn(dirPath string, fn func(name string, typ os.FileMode) error) error {
	fd, err := openFileWithFD(dirPath, readMode, 0o666)

	nodeAPPEND = constants.Get("O_APPEND").Int()
	nodeEXCL   = constants.Get("O_EXCL").Int()
)

type jsFile struct {
	path    string
	entries []string
	dirIdx  int // entries[:dirIdx] have already been returned in ReadDirent
	pos     int64
	seeked  bool
}

var filesMu sync.Mutex
var files = map[int]*jsFile{
	0: {},
	1: {},
	2: {},
}

func fdToFile(fd int) (*jsFile, error) {
	filesMu.Lock()
	f, ok := files[fd]

	// We store the number of entries to skip in the seek
	// offset of fd. See issue #31368.
	// It's not the full required semantics, but should handle the case
	// of calling Getdirentries or ReadDirent repeatedly.
	// It won't handle assigning the results of lseek to *basep, or handle
	// the directory being edited underfoot.
	skip, err := Seek(fd, 0, 1 /* SEEK_CUR */)
	if err != nil {
		return 0, err
	}

	if len(gids) == 0 {
		return setgroups(0, nil)
	}

	a := make([]_Gid_t, len(gids))
	for i, v := range gids {
		a[i] = _Gid_t(v)
	}
	return setgroups(len(a), &a[0])
}

func ReadDirent(fd int, buf []byte) (n int, err error) {
	// Final argument is (basep *uintptr) and the syscall doesn't take nil.
	// 64 bits should be enough. (32 bits isn't even on 386). Since the