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import { Node } from './Node';
import { Link } from './Link';
import { File } from './File';
import { Buffer } from '../internal/buffer';
import process from '../process';
import { constants } from '../constants';
import { ERRSTR, FLAGS, MODE } from '../node/constants';
import { pathToFilename, createError } from '../node/util';
import { dataToBuffer, filenameToSteps, isFd, resolve, validateFd } from './util';
import { DirectoryJSON, flattenJSON, NestedDirectoryJSON } from './json';
import type { PathLike } from '../node/types/misc';
import { ERROR_CODE } from './constants';
import { TFileId } from './types';
type TCallback<TData> = (error?: any, data?: TData) => void;
const { sep, relative, join, dirname } = NodePath.posix ? NodePath.posix : NodePath;
const {
O_RDONLY,
O_WRONLY,
O_RDWR,
O_CREAT,
O_EXCL,
O_TRUNC,
O_APPEND,
O_DIRECTORY,
O_SYMLINK,
F_OK,
COPYFILE_EXCL,
COPYFILE_FICLONE_FORCE,
} = constants;
/**
* Represents a filesystem superblock, which is the root of a virtual
* filesystem in Linux.
* @see https://lxr.linux.no/linux+v3.11.2/include/linux/fs.h#L1242
*/
export class Superblock {
static fromJSON(json: DirectoryJSON, cwd?: string): Superblock {
const vol = new Superblock();
vol.fromJSON(json, cwd);
return vol;
}
static fromNestedJSON(json: NestedDirectoryJSON, cwd?: string): Superblock {
const vol = new Superblock();
vol.fromNestedJSON(json, cwd);
return vol;
}
/**
* Global file descriptor counter. UNIX file descriptors start from 0 and go sequentially
* up, so here, in order not to conflict with them, we choose some big number and descrease
* the file descriptor of every new opened file.
* @type {number}
* @todo This should not be static, right?
*/
static fd: number = 0x7fffffff;
// Constructor function used to create new nodes.
// NodeClass: new (...args) => TNode = Node as new (...args) => TNode;
// Hard link to the root of this volume.
// root: Node = new (this.NodeClass)(null, '', true);
root: Link;
// I-node number counter.
ino: number = 0;
// A mapping for i-node numbers to i-nodes (`Node`);
inodes: { [ino: number]: Node } = {};
// List of released i-node numbers, for reuse.
releasedInos: number[] = [];
// A mapping for file descriptors to `File`s.
fds: { [fd: number]: File } = {};
// A list of reusable (opened and closed) file descriptors, that should be
// used first before creating a new file descriptor.
releasedFds: number[] = [];
// Max number of open files.
maxFiles = 10000;
// Current number of open files.
openFiles = 0;
constructor(props = {}) {
const root = this.createLink();
root.setNode(this.createNode(constants.S_IFDIR | 0o777));
const self = this; // tslint:disable-line no-this-assignment
root.setChild('.', root);
root.getNode().nlink++;
root.setChild('..', root);
root.getNode().nlink++;
this.root = root;
}
createLink(): Link;
createLink(parent: Link, name: string, isDirectory?: boolean, mode?: number): Link;
createLink(parent?: Link, name?: string, isDirectory: boolean = false, mode?: number): Link {
if (!parent) {
return new Link(this, void 0, '');
}
Iif (!name) {
throw new Error('createLink: name cannot be empty');
}
// If no explicit permission is provided, use defaults based on type
const finalPerm = mode ?? (isDirectory ? 0o777 : 0o666);
// To prevent making a breaking change, `mode` can also just be a permission number
// and the file type is set based on `isDirectory`
const hasFileType = mode && mode & constants.S_IFMT;
const modeType = hasFileType ? mode & constants.S_IFMT : isDirectory ? constants.S_IFDIR : constants.S_IFREG;
const finalMode = (finalPerm & ~constants.S_IFMT) | modeType;
return parent.createChild(name, this.createNode(finalMode));
}
deleteLink(link: Link): boolean {
const parent = link.parent;
if (parent) {
parent.deleteChild(link);
return true;
}
return false;
}
private newInoNumber(): number {
const releasedFd = this.releasedInos.pop();
if (releasedFd) return releasedFd;
else {
this.ino = (this.ino + 1) % 0xffffffff;
return this.ino;
}
}
private newFdNumber(): number {
const releasedFd = this.releasedFds.pop();
return typeof releasedFd === 'number' ? releasedFd : Superblock.fd--;
}
createNode(mode: number): Node {
const node = new Node(this.newInoNumber(), mode);
this.inodes[node.ino] = node;
return node;
}
deleteNode(node: Node) {
node.del();
delete this.inodes[node.ino];
this.releasedInos.push(node.ino);
}
walk(
steps: string[],
resolveSymlinks: boolean,
checkExistence: boolean,
checkAccess: boolean,
funcName?: string,
): Link | null;
walk(
filename: string,
resolveSymlinks: boolean,
checkExistence: boolean,
checkAccess: boolean,
funcName?: string,
): Link | null;
walk(
link: Link,
resolveSymlinks: boolean,
checkExistence: boolean,
checkAccess: boolean,
funcName?: string,
): Link | null;
walk(
stepsOrFilenameOrLink: string[] | string | Link,
resolveSymlinks: boolean,
checkExistence: boolean,
checkAccess: boolean,
funcName?: string,
): Link | null;
walk(
stepsOrFilenameOrLink: string[] | string | Link,
resolveSymlinks: boolean = false,
checkExistence: boolean = false,
checkAccess: boolean = false,
funcName?: string,
): Link | null {
let steps: string[];
let filename: string;
Iif (stepsOrFilenameOrLink instanceof Link) {
steps = stepsOrFilenameOrLink.steps;
filename = sep + steps.join(sep);
} else if (typeof stepsOrFilenameOrLink === 'string') {
steps = filenameToSteps(stepsOrFilenameOrLink);
filename = stepsOrFilenameOrLink;
} else {
steps = stepsOrFilenameOrLink;
filename = sep + steps.join(sep);
}
let curr: Link | null = this.root;
let i = 0;
while (i < steps.length) {
let node: Node = curr.getNode();
// Check access permissions if current link is a directory
if (node.isDirectory()) {
if (checkAccess && !node.canExecute()) {
throw createError(ERROR_CODE.EACCES, funcName, filename);
}
} else {
if (i < steps.length - 1) throw createError(ERROR_CODE.ENOTDIR, funcName, filename);
}
curr = curr.getChild(steps[i]) ?? null;
// Check existence of current link
if (!curr)
if (checkExistence) throw createError(ERROR_CODE.ENOENT, funcName, filename);
else return null;
node = curr?.getNode();
// Resolve symlink if we're resolving all symlinks OR if this is an intermediate path component
// This allows lstat to traverse through symlinks in intermediate directories while not resolving the final component
if (node.isSymlink() && (resolveSymlinks || i < steps.length - 1)) {
const resolvedPath = NodePath.isAbsolute(node.symlink)
? node.symlink
: join(NodePath.dirname(curr.getPath()), node.symlink); // Relative to symlink's parent
steps = filenameToSteps(resolvedPath).concat(steps.slice(i + 1));
curr = this.root;
i = 0;
continue;
}
// After resolving symlinks, check if it's not a directory and we still have more steps
// This handles the case where we try to traverse through a file
// Only do this check when we're doing filesystem operations (checkExistence = true)
if (checkExistence && !node.isDirectory() && i < steps.length - 1) {
// On Windows, use ENOENT for consistency with Node.js behavior
// On other platforms, use ENOTDIR which is more semantically correct
const errorCode = process.platform === 'win32' ? ERROR_CODE.ENOENT : ERROR_CODE.ENOTDIR;
throw createError(errorCode, funcName, filename);
}
i++;
}
return curr;
}
// Returns a `Link` (hard link) referenced by path "split" into steps.
getLink(steps: string[]): Link | null {
return this.walk(steps, false, false, false);
}
// Just link `getLink`, but throws a correct user error, if link to found.
getLinkOrThrow(filename: string, funcName?: string): Link {
return this.walk(filename, false, true, true, funcName)!;
}
// Just like `getLink`, but also dereference/resolves symbolic links.
getResolvedLink(filenameOrSteps: string | string[]): Link | null {
return this.walk(filenameOrSteps, true, false, false);
}
/**
* Just like `getLinkOrThrow`, but also dereference/resolves symbolic links.
*/
getResolvedLinkOrThrow(filename: string, funcName?: string): Link {
return this.walk(filename, true, true, true, funcName)!;
}
resolveSymlinks(link: Link): Link | null {
return this.getResolvedLink(link.steps.slice(1));
}
/**
* Just like `getLinkOrThrow`, but also verifies that the link is a directory.
*/
getLinkAsDirOrThrow(filename: string, funcName?: string): Link {
const link = this.getLinkOrThrow(filename, funcName)!;
Iif (!link.getNode().isDirectory()) throw createError(ERROR_CODE.ENOTDIR, funcName, filename);
return link;
}
// Get the immediate parent directory of the link.
getLinkParent(steps: string[]): Link | null {
return this.getLink(steps.slice(0, -1));
}
getLinkParentAsDirOrThrow(filenameOrSteps: string | string[], funcName?: string): Link {
const steps: string[] = (
filenameOrSteps instanceof Array ? filenameOrSteps : filenameToSteps(filenameOrSteps)
).slice(0, -1);
const filename: string = sep + steps.join(sep);
const link = this.getLinkOrThrow(filename, funcName);
Iif (!link.getNode().isDirectory()) throw createError(ERROR_CODE.ENOTDIR, funcName, filename);
return link;
}
getFileByFd(fd: number): File {
return this.fds[String(fd)];
}
getFileByFdOrThrow(fd: number, funcName?: string): File {
if (!isFd(fd)) throw TypeError(ERRSTR.FD);
const file = this.getFileByFd(fd);
if (!file) throw createError(ERROR_CODE.EBADF, funcName);
return file;
}
_toJSON(link = this.root, json = {}, path?: string, asBuffer?: boolean): DirectoryJSON<string | null> {
let isEmpty = true;
let children = link.children;
if (link.getNode().isFile()) {
children = new Map([[link.getName(), link.parent!.getChild(link.getName())]]);
link = link.parent!;
}
for (const name of children.keys()) {
if (name === '.' || name === '..') {
continue;
}
isEmpty = false;
const child = link.getChild(name);
Iif (!child) {
throw new Error('_toJSON: unexpected undefined');
}
const node = child.getNode();
if (node.isFile()) {
let filename = child.getPath();
Iif (path) filename = relative(path, filename);
json[filename] = asBuffer ? node.getBuffer() : node.getString();
} else if (node.isDirectory()) {
this._toJSON(child, json, path, asBuffer);
}
}
let dirPath = link.getPath();
Iif (path) dirPath = relative(path, dirPath);
if (dirPath && isEmpty) {
json[dirPath] = null;
}
return json;
}
toJSON(paths?: PathLike | PathLike[], json = {}, isRelative = false, asBuffer = false): DirectoryJSON<string | null> {
const links: Link[] = [];
if (paths) {
if (!Array.isArray(paths)) paths = [paths];
for (const path of paths) {
const filename = pathToFilename(path);
const link = this.getResolvedLink(filename);
if (!link) continue;
links.push(link);
}
} else {
links.push(this.root);
}
if (!links.length) return json;
for (const link of links) this._toJSON(link, json, isRelative ? link.getPath() : '', asBuffer);
return json;
}
// TODO: `cwd` should probably not invoke `process.cwd()`.
fromJSON(json: DirectoryJSON, cwd: string = process.cwd()) {
for (let filename in json) {
const data = json[filename];
filename = resolve(filename, cwd);
if (typeof data === 'string' || data instanceof Buffer) {
const dir = dirname(filename);
this.mkdirp(dir, MODE.DIR);
const buffer = dataToBuffer(data);
this.writeFile(filename, buffer, FLAGS.w, MODE.DEFAULT);
} else {
this.mkdirp(filename, MODE.DIR);
}
}
}
fromNestedJSON(json: NestedDirectoryJSON, cwd?: string) {
this.fromJSON(flattenJSON(json), cwd);
}
reset() {
this.ino = 0;
this.inodes = {};
this.releasedInos = [];
this.fds = {};
this.releasedFds = [];
this.openFiles = 0;
this.root = this.createLink();
this.root.setNode(this.createNode(constants.S_IFDIR | 0o777));
}
// Legacy interface
mountSync(mountpoint: string, json: DirectoryJSON) {
this.fromJSON(json, mountpoint);
}
openLink(link: Link, flagsNum: number, resolveSymlinks: boolean = true): File {
Iif (this.openFiles >= this.maxFiles) {
// Too many open files.
throw createError(ERROR_CODE.EMFILE, 'open', link.getPath());
}
// Resolve symlinks.
//
// @TODO: This should be superfluous. This method is only ever called by openFile(), which does its own symlink resolution
// prior to calling.
let realLink: Link | null = link;
if (resolveSymlinks) realLink = this.getResolvedLinkOrThrow(link.getPath(), 'open');
const node = realLink.getNode();
// Check whether node is a directory
if (node.isDirectory()) {
if ((flagsNum & (O_RDONLY | O_RDWR | O_WRONLY)) !== O_RDONLY)
throw createError(ERROR_CODE.EISDIR, 'open', link.getPath());
} else {
Iif (flagsNum & O_DIRECTORY) throw createError(ERROR_CODE.ENOTDIR, 'open', link.getPath());
}
// Check node permissions
if (!(flagsNum & O_WRONLY)) {
if (!node.canRead()) {
throw createError(ERROR_CODE.EACCES, 'open', link.getPath());
}
}
if (!(flagsNum & O_RDONLY)) {
if (!node.canWrite()) {
throw createError(ERROR_CODE.EACCES, 'open', link.getPath());
}
}
const file = new File(link, node, flagsNum, this.newFdNumber());
this.fds[file.fd] = file;
this.openFiles++;
if (flagsNum & O_TRUNC) file.truncate();
return file;
}
protected openFile(
filename: string,
flagsNum: number,
modeNum: number | undefined,
resolveSymlinks: boolean = true,
): File {
const steps = filenameToSteps(filename);
let link: Link | null;
try {
link = resolveSymlinks ? this.getResolvedLinkOrThrow(filename, 'open') : this.getLinkOrThrow(filename, 'open');
// Check if file already existed when trying to create it exclusively (O_CREAT and O_EXCL flags are set).
// This is an error, see https://pubs.opengroup.org/onlinepubs/009695399/functions/open.html:
// "If O_CREAT and O_EXCL are set, open() shall fail if the file exists."
if (link && flagsNum & O_CREAT && flagsNum & O_EXCL) throw createError(ERROR_CODE.EEXIST, 'open', filename);
} catch (err) {
// Try creating a new file, if it does not exist and O_CREAT flag is set.
// Note that this will still throw if the ENOENT came from one of the
// intermediate directories instead of the file itself.
if (err.code === ERROR_CODE.ENOENT && flagsNum & O_CREAT) {
const dirname: string = NodePath.dirname(filename);
const dirLink: Link = this.getResolvedLinkOrThrow(dirname);
const dirNode = dirLink.getNode();
// Check that the place we create the new file is actually a directory and that we are allowed to do so:
Iif (!dirNode.isDirectory()) throw createError(ERROR_CODE.ENOTDIR, 'open', filename);
if (!dirNode.canExecute() || !dirNode.canWrite()) throw createError(ERROR_CODE.EACCES, 'open', filename);
// This is a difference to the original implementation, which would simply not create a file unless modeNum was specified.
// However, current Node versions will default to 0o666.
modeNum ??= 0o666;
link = this.createLink(dirLink, steps[steps.length - 1], false, modeNum);
} else throw err;
}
if (link) return this.openLink(link, flagsNum, resolveSymlinks);
throw createError(ERROR_CODE.ENOENT, 'open', filename);
}
public readonly open = (
filename: string,
flagsNum: number,
modeNum: number,
resolveSymlinks: boolean = true,
): number => {
const file = this.openFile(filename, flagsNum, modeNum, resolveSymlinks);
Iif (!file) throw createError(ERROR_CODE.ENOENT, 'open', filename);
return file.fd;
};
public readonly writeFile = (id: TFileId, buf: Buffer, flagsNum: number, modeNum: number) => {
const isUserFd = typeof id === 'number';
let fd: number;
if (isUserFd) fd = id as number;
else fd = this.open(pathToFilename(id as PathLike), flagsNum, modeNum);
let offset = 0;
let length = buf.length;
let position = flagsNum & O_APPEND ? undefined : 0;
try {
while (length > 0) {
const written = this.write(fd, buf, offset, length, position);
offset += written;
length -= written;
if (position !== undefined) position += written;
}
} finally {
if (!isUserFd) this.close(fd);
}
};
public readonly read = (
fd: number,
buffer: Buffer | ArrayBufferView | DataView,
offset: number,
length: number,
position: number | null,
): number => {
if (buffer.byteLength < length) {
throw createError(ERROR_CODE.ERR_OUT_OF_RANGE, 'read', undefined, undefined, RangeError);
}
const file = this.getFileByFdOrThrow(fd);
if (file.node.isSymlink()) {
throw createError(ERROR_CODE.EPERM, 'read', file.link.getPath());
}
return file.read(
buffer,
Number(offset),
Number(length),
position === -1 || typeof position !== 'number' ? undefined : position,
);
};
public readonly readv = (fd: number, buffers: ArrayBufferView[], position: number | null): number => {
const file = this.getFileByFdOrThrow(fd);
let p = position ?? undefined;
Iif (p === -1) p = undefined;
let bytesRead = 0;
for (const buffer of buffers) {
const bytes = file.read(buffer, 0, buffer.byteLength, p);
p = undefined;
bytesRead += bytes;
if (bytes < buffer.byteLength) break;
}
return bytesRead;
};
public readonly link = (filename1: string, filename2: string) => {
let link1: Link;
try {
link1 = this.getLinkOrThrow(filename1, 'link');
} catch (err) {
if (err.code) err = createError(err.code, 'link', filename1, filename2);
throw err;
}
const dirname2 = NodePath.dirname(filename2);
let dir2: Link;
try {
dir2 = this.getLinkOrThrow(dirname2, 'link');
} catch (err) {
// Augment error with filename1
Iif (err.code) err = createError(err.code, 'link', filename1, filename2);
throw err;
}
const name = NodePath.basename(filename2);
Iif (dir2.getChild(name)) throw createError(ERROR_CODE.EEXIST, 'link', filename1, filename2);
const node = link1.getNode();
node.nlink++;
dir2.createChild(name, node);
};
public readonly unlink = (filename: string) => {
const link: Link = this.getLinkOrThrow(filename, 'unlink');
// TODO: Check if it is file, dir, other...
Iif (link.length) throw Error('Dir not empty...');
this.deleteLink(link);
const node = link.getNode();
node.nlink--;
// When all hard links to i-node are deleted, remove the i-node, too.
if (node.nlink <= 0) {
this.deleteNode(node);
}
};
public readonly symlink = (targetFilename: string, pathFilename: string): Link => {
const pathSteps = filenameToSteps(pathFilename);
// Check if directory exists, where we about to create a symlink.
let dirLink;
try {
dirLink = this.getLinkParentAsDirOrThrow(pathSteps);
} catch (err) {
// Catch error to populate with the correct fields - getLinkParentAsDirOrThrow won't be aware of the second path
Iif (err.code) err = createError(err.code, 'symlink', targetFilename, pathFilename);
throw err;
}
const name = pathSteps[pathSteps.length - 1];
// Check if new file already exists.
if (dirLink.getChild(name)) throw createError(ERROR_CODE.EEXIST, 'symlink', targetFilename, pathFilename);
// Check permissions on the path where we are creating the symlink.
// Note we're not checking permissions on the target path: It is not an error to create a symlink to a
// non-existent or inaccessible target
const node = dirLink.getNode();
Iif (!node.canExecute() || !node.canWrite())
throw createError(ERROR_CODE.EACCES, 'symlink', targetFilename, pathFilename);
// Create symlink.
const symlink: Link = dirLink.createChild(name);
symlink.getNode().makeSymlink(targetFilename);
return symlink;
};
public readonly rename = (oldPathFilename: string, newPathFilename: string) => {
let link: Link;
try {
link = this.getResolvedLinkOrThrow(oldPathFilename);
} catch (err) {
// Augment err with newPathFilename
if (err.code) err = createError(err.code, 'rename', oldPathFilename, newPathFilename);
throw err;
}
// TODO: Check if it is directory, if non-empty, we cannot move it, right?
// Check directory exists for the new location.
let newPathDirLink: Link;
try {
newPathDirLink = this.getLinkParentAsDirOrThrow(newPathFilename);
} catch (err) {
// Augment error with oldPathFilename
Iif (err.code) err = createError(err.code, 'rename', oldPathFilename, newPathFilename);
throw err;
}
// TODO: Also treat cases with directories and symbolic links.
// TODO: See: http://man7.org/linux/man-pages/man2/rename.2.html
// Remove hard link from old folder.
const oldLinkParent = link.parent;
Iif (!oldLinkParent) throw createError(ERROR_CODE.EINVAL, 'rename', oldPathFilename, newPathFilename);
// Check we have access and write permissions in both places
const oldParentNode: Node = oldLinkParent.getNode();
const newPathDirNode: Node = newPathDirLink.getNode();
if (
!oldParentNode.canExecute() ||
!oldParentNode.canWrite() ||
!newPathDirNode.canExecute() ||
!newPathDirNode.canWrite()
) {
throw createError(ERROR_CODE.EACCES, 'rename', oldPathFilename, newPathFilename);
}
oldLinkParent.deleteChild(link);
// Rename should overwrite the new path, if that exists.
const name = NodePath.basename(newPathFilename);
link.name = name;
link.steps = [...newPathDirLink.steps, name];
newPathDirLink.setChild(link.getName(), link);
};
public readonly mkdir = (filename: string, modeNum: number): void => {
const steps = filenameToSteps(filename);
// This will throw if user tries to create root dir `fs.mkdirSync('/')`.
if (!steps.length) throw createError(ERROR_CODE.EEXIST, 'mkdir', filename);
const dir = this.getLinkParentAsDirOrThrow(filename, 'mkdir');
// Check path already exists.
const name = steps[steps.length - 1];
if (dir.getChild(name)) throw createError(ERROR_CODE.EEXIST, 'mkdir', filename);
const node = dir.getNode();
if (!node.canWrite() || !node.canExecute()) throw createError(ERROR_CODE.EACCES, 'mkdir', filename);
dir.createChild(name, this.createNode(constants.S_IFDIR | modeNum));
};
/**
* Creates directory tree recursively.
*/
public readonly mkdirp = (filename: string, modeNum: number): string | undefined => {
let created = false;
const steps = filenameToSteps(filename);
let curr: Link | null = null;
let i = steps.length;
// Find the longest subpath of filename that still exists:
for (i = steps.length; i >= 0; i--) {
curr = this.getResolvedLink(steps.slice(0, i));
if (curr) break;
}
Iif (!curr) {
curr = this.root;
i = 0;
}
// curr is now the last directory that still exists.
// (If none of them existed, curr is the root.)
// Check access the lazy way:
curr = this.getResolvedLinkOrThrow(sep + steps.slice(0, i).join(sep), 'mkdir');
// Start creating directories:
for (i; i < steps.length; i++) {
const node = curr.getNode();
if (node.isDirectory()) {
// Check we have permissions
if (!node.canExecute() || !node.canWrite()) throw createError(ERROR_CODE.EACCES, 'mkdir', filename);
} else E{
throw createError(ERROR_CODE.ENOTDIR, 'mkdir', filename);
}
created = true;
curr = curr.createChild(steps[i], this.createNode(constants.S_IFDIR | modeNum));
}
return created ? filename : undefined;
};
public readonly rmdir = (filename: string, recursive: boolean = false) => {
const link = this.getLinkAsDirOrThrow(filename, 'rmdir');
if (link.length && !recursive) throw createError(ERROR_CODE.ENOTEMPTY, 'rmdir', filename);
this.deleteLink(link);
};
public readonly rm = (filename: string, force: boolean = false, recursive: boolean = false): void => {
// "stat" is used to match Node's native error message.
let link: Link;
try {
link = this.getResolvedLinkOrThrow(filename, 'stat');
} catch (err) {
// Silently ignore missing paths if force option is true
if (err.code === ERROR_CODE.ENOENT && force) return;
else throw err;
}
if (link.getNode().isDirectory() && !recursive) throw createError(ERROR_CODE.ERR_FS_EISDIR, 'rm', filename);
if (!link.parent?.getNode().canWrite()) throw createError(ERROR_CODE.EACCES, 'rm', filename);
this.deleteLink(link);
};
protected closeFile(file: File) {
Iif (!this.fds[file.fd]) return;
this.openFiles--;
delete this.fds[file.fd];
this.releasedFds.push(file.fd);
}
public readonly close = (fd: number) => {
validateFd(fd);
const file = this.getFileByFdOrThrow(fd, 'close');
this.closeFile(file);
};
write(fd: number, buf: Buffer, offset?: number, length?: number, position?: number | null): number {
const file = this.getFileByFdOrThrow(fd, 'write');
Iif (file.node.isSymlink()) {
throw createError(ERROR_CODE.EBADF, 'write', file.link.getPath());
}
return file.write(buf, offset, length, position === -1 || typeof position !== 'number' ? undefined : position);
}
}
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