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fs.js
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3285 lines (2929 loc) · 83.8 KB
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// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
// Maintainers, keep in mind that ES1-style octal literals (`0666`) are not
// allowed in strict mode. Use ES6-style octal literals instead (`0o666`).
'use strict';
const {
ArrayPrototypePush,
BigIntPrototypeToString,
Boolean,
MathMax,
Number,
ObjectDefineProperties,
ObjectDefineProperty,
Promise,
PromiseResolve,
ReflectApply,
SafeMap,
SafeSet,
StringPrototypeCharCodeAt,
StringPrototypeIndexOf,
StringPrototypeSlice,
} = primordials;
const { fs: constants } = internalBinding('constants');
const {
S_IFIFO,
S_IFLNK,
S_IFMT,
S_IFREG,
S_IFSOCK,
F_OK,
R_OK,
W_OK,
X_OK,
O_WRONLY,
O_SYMLINK,
} = constants;
const pathModule = require('path');
const { isAbsolute } = pathModule;
const { isArrayBufferView } = require('internal/util/types');
const binding = internalBinding('fs');
const { createBlobFromFilePath } = require('internal/blob');
const { Buffer } = require('buffer');
const {
aggregateTwoErrors,
codes: {
ERR_ACCESS_DENIED,
ERR_FS_FILE_TOO_LARGE,
ERR_INVALID_ARG_VALUE,
},
AbortError,
} = require('internal/errors');
const {
FSReqCallback,
statValues,
} = binding;
const { toPathIfFileURL } = require('internal/url');
const {
customPromisifyArgs: kCustomPromisifyArgsSymbol,
kEmptyObject,
promisify: {
custom: kCustomPromisifiedSymbol,
},
SideEffectFreeRegExpPrototypeExec,
defineLazyProperties,
} = require('internal/util');
const {
constants: {
kIoMaxLength,
kMaxUserId,
},
copyObject,
Dirent,
emitRecursiveRmdirWarning,
getDirent,
getDirents,
getOptions,
getValidatedFd,
getValidatedPath,
getValidMode,
handleErrorFromBinding,
possiblyTransformPath,
preprocessSymlinkDestination,
Stats,
getStatFsFromBinding,
getStatsFromBinding,
realpathCacheKey,
stringToFlags,
stringToSymlinkType,
toUnixTimestamp,
validateBufferArray,
validateCpOptions,
validateOffsetLengthRead,
validateOffsetLengthWrite,
validatePath,
validatePosition,
validateRmOptions,
validateRmOptionsSync,
validateRmdirOptions,
validateStringAfterArrayBufferView,
warnOnNonPortableTemplate,
} = require('internal/fs/utils');
const {
CHAR_FORWARD_SLASH,
CHAR_BACKWARD_SLASH,
} = require('internal/constants');
const {
isInt32,
parseFileMode,
validateBoolean,
validateBuffer,
validateEncoding,
validateFunction,
validateInteger,
validateObject,
validateString,
kValidateObjectAllowNullable,
} = require('internal/validators');
const permission = require('internal/process/permission');
let truncateWarn = true;
let fs;
// Lazy loaded
let cpFn;
let cpSyncFn;
let promises = null;
let ReadStream;
let WriteStream;
let rimraf;
let rimrafSync;
let kResistStopPropagation;
// These have to be separate because of how graceful-fs happens to do it's
// monkeypatching.
let FileReadStream;
let FileWriteStream;
const isWindows = process.platform === 'win32';
const isOSX = process.platform === 'darwin';
function showTruncateDeprecation() {
if (truncateWarn) {
process.emitWarning(
'Using fs.truncate with a file descriptor is deprecated. Please use ' +
'fs.ftruncate with a file descriptor instead.',
'DeprecationWarning', 'DEP0081');
truncateWarn = false;
}
}
function maybeCallback(cb) {
validateFunction(cb, 'cb');
return cb;
}
// Ensure that callbacks run in the global context. Only use this function
// for callbacks that are passed to the binding layer, callbacks that are
// invoked from JS already run in the proper scope.
function makeCallback(cb) {
validateFunction(cb, 'cb');
return (...args) => ReflectApply(cb, this, args);
}
// Special case of `makeCallback()` that is specific to async `*stat()` calls as
// an optimization, since the data passed back to the callback needs to be
// transformed anyway.
function makeStatsCallback(cb) {
validateFunction(cb, 'cb');
return (err, stats) => {
if (err) return cb(err);
cb(err, getStatsFromBinding(stats));
};
}
const isFd = isInt32;
function isFileType(stats, fileType) {
// Use stats array directly to avoid creating an fs.Stats instance just for
// our internal use.
let mode = stats[1];
if (typeof mode === 'bigint')
mode = Number(mode);
return (mode & S_IFMT) === fileType;
}
/**
* Tests a user's permissions for the file or directory
* specified by `path`.
* @param {string | Buffer | URL} path
* @param {number} [mode]
* @param {(err?: Error) => any} callback
* @returns {void}
*/
function access(path, mode, callback) {
if (typeof mode === 'function') {
callback = mode;
mode = F_OK;
}
path = getValidatedPath(path);
mode = getValidMode(mode, 'access');
callback = makeCallback(callback);
const req = new FSReqCallback();
req.oncomplete = callback;
binding.access(pathModule.toNamespacedPath(path), mode, req);
}
/**
* Synchronously tests a user's permissions for the file or
* directory specified by `path`.
* @param {string | Buffer | URL} path
* @param {number} [mode]
* @returns {void}
*/
function accessSync(path, mode) {
path = getValidatedPath(path);
mode = getValidMode(mode, 'access');
binding.access(pathModule.toNamespacedPath(path), mode);
}
/**
* Tests whether or not the given path exists.
* @param {string | Buffer | URL} path
* @param {(exists?: boolean) => any} callback
* @returns {void}
*/
function exists(path, callback) {
maybeCallback(callback);
function suppressedCallback(err) {
callback(err ? false : true);
}
try {
fs.access(path, F_OK, suppressedCallback);
} catch {
return callback(false);
}
}
ObjectDefineProperty(exists, kCustomPromisifiedSymbol, {
__proto__: null,
value: function exists(path) { // eslint-disable-line func-name-matching
return new Promise((resolve) => fs.exists(path, resolve));
},
});
// fs.existsSync never throws, it only returns true or false.
// Since fs.existsSync never throws, users have established
// the expectation that passing invalid arguments to it, even like
// fs.existsSync(), would only get a false in return, so we cannot signal
// validation errors to users properly out of compatibility concerns.
// TODO(joyeecheung): deprecate the never-throw-on-invalid-arguments behavior
/**
* Synchronously tests whether or not the given path exists.
* @param {string | Buffer | URL} path
* @returns {boolean}
*/
function existsSync(path) {
try {
path = getValidatedPath(path);
} catch {
return false;
}
return binding.existsSync(pathModule.toNamespacedPath(path));
}
function readFileAfterOpen(err, fd) {
const context = this.context;
if (err) {
context.callback(err);
return;
}
context.fd = fd;
const req = new FSReqCallback();
req.oncomplete = readFileAfterStat;
req.context = context;
binding.fstat(fd, false, req);
}
function readFileAfterStat(err, stats) {
const context = this.context;
if (err)
return context.close(err);
// TODO(BridgeAR): Check if allocating a smaller chunk is better performance
// wise, similar to the promise based version (less peak memory and chunked
// stringify operations vs multiple C++/JS boundary crossings).
const size = context.size = isFileType(stats, S_IFREG) ? stats[8] : 0;
if (size > kIoMaxLength) {
err = new ERR_FS_FILE_TOO_LARGE(size);
return context.close(err);
}
try {
if (size === 0) {
// TODO(BridgeAR): If an encoding is set, use the StringDecoder to concat
// the result and reuse the buffer instead of allocating a new one.
context.buffers = [];
} else {
context.buffer = Buffer.allocUnsafeSlow(size);
}
} catch (err) {
return context.close(err);
}
context.read();
}
function checkAborted(signal, callback) {
if (signal?.aborted) {
callback(new AbortError(undefined, { cause: signal?.reason }));
return true;
}
return false;
}
/**
* Asynchronously reads the entire contents of a file.
* @param {string | Buffer | URL | number} path
* @param {{
* encoding?: string | null;
* flag?: string;
* signal?: AbortSignal;
* } | string} [options]
* @param {(
* err?: Error,
* data?: string | Buffer
* ) => any} callback
* @returns {void}
*/
function readFile(path, options, callback) {
callback = maybeCallback(callback || options);
options = getOptions(options, { flag: 'r' });
const ReadFileContext = require('internal/fs/read/context');
const context = new ReadFileContext(callback, options.encoding);
context.isUserFd = isFd(path); // File descriptor ownership
if (options.signal) {
context.signal = options.signal;
}
if (context.isUserFd) {
process.nextTick(function tick(context) {
ReflectApply(readFileAfterOpen, { context }, [null, path]);
}, context);
return;
}
if (checkAborted(options.signal, callback))
return;
const flagsNumber = stringToFlags(options.flag, 'options.flag');
path = getValidatedPath(path);
const req = new FSReqCallback();
req.context = context;
req.oncomplete = readFileAfterOpen;
binding.open(pathModule.toNamespacedPath(path),
flagsNumber,
0o666,
req);
}
function tryStatSync(fd, isUserFd) {
const stats = binding.fstat(fd, false, undefined, true /* shouldNotThrow */);
if (stats === undefined && !isUserFd) {
fs.closeSync(fd);
}
return stats;
}
function tryCreateBuffer(size, fd, isUserFd) {
let threw = true;
let buffer;
try {
if (size > kIoMaxLength) {
throw new ERR_FS_FILE_TOO_LARGE(size);
}
buffer = Buffer.allocUnsafe(size);
threw = false;
} finally {
if (threw && !isUserFd) fs.closeSync(fd);
}
return buffer;
}
function tryReadSync(fd, isUserFd, buffer, pos, len) {
let threw = true;
let bytesRead;
try {
bytesRead = fs.readSync(fd, buffer, pos, len);
threw = false;
} finally {
if (threw && !isUserFd) fs.closeSync(fd);
}
return bytesRead;
}
/**
* Synchronously reads the entire contents of a file.
* @param {string | Buffer | URL | number} path
* @param {{
* encoding?: string | null;
* flag?: string;
* }} [options]
* @returns {string | Buffer}
*/
function readFileSync(path, options) {
options = getOptions(options, { flag: 'r' });
if (options.encoding === 'utf8' || options.encoding === 'utf-8') {
if (!isInt32(path)) {
path = pathModule.toNamespacedPath(getValidatedPath(path));
}
return binding.readFileUtf8(path, stringToFlags(options.flag));
}
const isUserFd = isFd(path); // File descriptor ownership
const fd = isUserFd ? path : fs.openSync(path, options.flag, 0o666);
const stats = tryStatSync(fd, isUserFd);
const size = isFileType(stats, S_IFREG) ? stats[8] : 0;
let pos = 0;
let buffer; // Single buffer with file data
let buffers; // List for when size is unknown
if (size === 0) {
buffers = [];
} else {
buffer = tryCreateBuffer(size, fd, isUserFd);
}
let bytesRead;
if (size !== 0) {
do {
bytesRead = tryReadSync(fd, isUserFd, buffer, pos, size - pos);
pos += bytesRead;
} while (bytesRead !== 0 && pos < size);
} else {
do {
// The kernel lies about many files.
// Go ahead and try to read some bytes.
buffer = Buffer.allocUnsafe(8192);
bytesRead = tryReadSync(fd, isUserFd, buffer, 0, 8192);
if (bytesRead !== 0) {
ArrayPrototypePush(buffers, buffer.slice(0, bytesRead));
}
pos += bytesRead;
} while (bytesRead !== 0);
}
if (!isUserFd)
fs.closeSync(fd);
if (size === 0) {
// Data was collected into the buffers list.
buffer = Buffer.concat(buffers, pos);
} else if (pos < size) {
buffer = buffer.slice(0, pos);
}
if (options.encoding) buffer = buffer.toString(options.encoding);
return buffer;
}
function defaultCloseCallback(err) {
if (err != null) throw err;
}
/**
* Closes the file descriptor.
* @param {number} fd
* @param {(err?: Error) => any} [callback]
* @returns {void}
*/
function close(fd, callback = defaultCloseCallback) {
fd = getValidatedFd(fd);
if (callback !== defaultCloseCallback)
callback = makeCallback(callback);
const req = new FSReqCallback();
req.oncomplete = callback;
binding.close(fd, req);
}
/**
* Synchronously closes the file descriptor.
* @param {number} fd
* @returns {void}
*/
function closeSync(fd) {
fd = getValidatedFd(fd);
binding.close(fd);
}
/**
* Asynchronously opens a file.
* @param {string | Buffer | URL} path
* @param {string | number} [flags]
* @param {string | number} [mode]
* @param {(
* err?: Error,
* fd?: number
* ) => any} callback
* @returns {void}
*/
function open(path, flags, mode, callback) {
path = getValidatedPath(path);
if (arguments.length < 3) {
callback = flags;
flags = 'r';
mode = 0o666;
} else if (typeof mode === 'function') {
callback = mode;
mode = 0o666;
} else {
mode = parseFileMode(mode, 'mode', 0o666);
}
const flagsNumber = stringToFlags(flags);
callback = makeCallback(callback);
const req = new FSReqCallback();
req.oncomplete = callback;
binding.open(pathModule.toNamespacedPath(path),
flagsNumber,
mode,
req);
}
/**
* Synchronously opens a file.
* @param {string | Buffer | URL} path
* @param {string | number} [flags]
* @param {string | number} [mode]
* @returns {number}
*/
function openSync(path, flags, mode) {
path = getValidatedPath(path);
return binding.open(
pathModule.toNamespacedPath(path),
stringToFlags(flags),
parseFileMode(mode, 'mode', 0o666),
);
}
/**
* @param {string | Buffer | URL } path
* @param {{
* type?: string;
* }} [options]
* @returns {Promise<Blob>}
*/
function openAsBlob(path, options = kEmptyObject) {
validateObject(options, 'options');
const type = options.type || '';
validateString(type, 'options.type');
// The underlying implementation here returns the Blob synchronously for now.
// To give ourselves flexibility to maybe return the Blob asynchronously,
// this API returns a Promise.
path = getValidatedPath(path);
return PromiseResolve(createBlobFromFilePath(pathModule.toNamespacedPath(path), { type }));
}
/**
* Reads file from the specified `fd` (file descriptor).
* @param {number} fd
* @param {Buffer | TypedArray | DataView} buffer
* @param {number} offsetOrOptions
* @param {number} length
* @param {number | bigint | null} position
* @param {(
* err?: Error,
* bytesRead?: number,
* buffer?: Buffer
* ) => any} callback
* @returns {void}
*/
function read(fd, buffer, offsetOrOptions, length, position, callback) {
fd = getValidatedFd(fd);
let offset = offsetOrOptions;
let params = null;
if (arguments.length <= 4) {
if (arguments.length === 4) {
// This is fs.read(fd, buffer, options, callback)
validateObject(offsetOrOptions, 'options', kValidateObjectAllowNullable);
callback = length;
params = offsetOrOptions;
} else if (arguments.length === 3) {
// This is fs.read(fd, bufferOrParams, callback)
if (!isArrayBufferView(buffer)) {
// This is fs.read(fd, params, callback)
params = buffer;
({ buffer = Buffer.alloc(16384) } = params ?? kEmptyObject);
}
callback = offsetOrOptions;
} else {
// This is fs.read(fd, callback)
callback = buffer;
buffer = Buffer.alloc(16384);
}
if (params !== undefined) {
validateObject(params, 'options', kValidateObjectAllowNullable);
}
({
offset = 0,
length = buffer?.byteLength - offset,
position = null,
} = params ?? kEmptyObject);
}
validateBuffer(buffer);
callback = maybeCallback(callback);
if (offset == null) {
offset = 0;
} else {
validateInteger(offset, 'offset', 0);
}
length |= 0;
if (length === 0) {
return process.nextTick(function tick() {
callback(null, 0, buffer);
});
}
if (buffer.byteLength === 0) {
throw new ERR_INVALID_ARG_VALUE('buffer', buffer,
'is empty and cannot be written');
}
validateOffsetLengthRead(offset, length, buffer.byteLength);
if (position == null) {
position = -1;
} else {
validatePosition(position, 'position', length);
}
function wrapper(err, bytesRead) {
// Retain a reference to buffer so that it can't be GC'ed too soon.
callback(err, bytesRead || 0, buffer);
}
const req = new FSReqCallback();
req.oncomplete = wrapper;
binding.read(fd, buffer, offset, length, position, req);
}
ObjectDefineProperty(read, kCustomPromisifyArgsSymbol,
{ __proto__: null, value: ['bytesRead', 'buffer'], enumerable: false });
/**
* Synchronously reads the file from the
* specified `fd` (file descriptor).
* @param {number} fd
* @param {Buffer | TypedArray | DataView} buffer
* @param {{
* offset?: number;
* length?: number;
* position?: number | bigint | null;
* }} [offsetOrOptions]
* @returns {number}
*/
function readSync(fd, buffer, offsetOrOptions, length, position) {
fd = getValidatedFd(fd);
validateBuffer(buffer);
let offset = offsetOrOptions;
if (arguments.length <= 3 || typeof offsetOrOptions === 'object') {
if (offsetOrOptions !== undefined) {
validateObject(offsetOrOptions, 'options', kValidateObjectAllowNullable);
}
({
offset = 0,
length = buffer.byteLength - offset,
position = null,
} = offsetOrOptions ?? kEmptyObject);
}
if (offset === undefined) {
offset = 0;
} else {
validateInteger(offset, 'offset', 0);
}
length |= 0;
if (length === 0) {
return 0;
}
if (buffer.byteLength === 0) {
throw new ERR_INVALID_ARG_VALUE('buffer', buffer,
'is empty and cannot be written');
}
validateOffsetLengthRead(offset, length, buffer.byteLength);
if (position == null) {
position = -1;
} else {
validatePosition(position, 'position', length);
}
return binding.read(fd, buffer, offset, length, position);
}
/**
* Reads file from the specified `fd` (file descriptor)
* and writes to an array of `ArrayBufferView`s.
* @param {number} fd
* @param {ArrayBufferView[]} buffers
* @param {number | null} [position]
* @param {(
* err?: Error,
* bytesRead?: number,
* buffers?: ArrayBufferView[];
* ) => any} callback
* @returns {void}
*/
function readv(fd, buffers, position, callback) {
function wrapper(err, read) {
callback(err, read || 0, buffers);
}
fd = getValidatedFd(fd);
validateBufferArray(buffers);
callback = maybeCallback(callback || position);
const req = new FSReqCallback();
req.oncomplete = wrapper;
if (typeof position !== 'number')
position = null;
binding.readBuffers(fd, buffers, position, req);
}
ObjectDefineProperty(readv, kCustomPromisifyArgsSymbol,
{ __proto__: null, value: ['bytesRead', 'buffers'], enumerable: false });
/**
* Synchronously reads file from the
* specified `fd` (file descriptor) and writes to an array
* of `ArrayBufferView`s.
* @param {number} fd
* @param {ArrayBufferView[]} buffers
* @param {number | null} [position]
* @returns {number}
*/
function readvSync(fd, buffers, position) {
fd = getValidatedFd(fd);
validateBufferArray(buffers);
if (typeof position !== 'number')
position = null;
return binding.readBuffers(fd, buffers, position);
}
/**
* Writes `buffer` to the specified `fd` (file descriptor).
* @param {number} fd
* @param {Buffer | TypedArray | DataView | string} buffer
* @param {number | object} [offsetOrOptions]
* @param {number} [length]
* @param {number | null} [position]
* @param {(
* err?: Error,
* bytesWritten?: number;
* buffer?: Buffer | TypedArray | DataView
* ) => any} callback
* @returns {void}
*/
function write(fd, buffer, offsetOrOptions, length, position, callback) {
function wrapper(err, written) {
// Retain a reference to buffer so that it can't be GC'ed too soon.
callback(err, written || 0, buffer);
}
fd = getValidatedFd(fd);
let offset = offsetOrOptions;
if (isArrayBufferView(buffer)) {
callback = maybeCallback(callback || position || length || offset);
if (typeof offset === 'object') {
({
offset = 0,
length = buffer.byteLength - offset,
position = null,
} = offsetOrOptions ?? kEmptyObject);
}
if (offset == null || typeof offset === 'function') {
offset = 0;
} else {
validateInteger(offset, 'offset', 0);
}
if (typeof length !== 'number')
length = buffer.byteLength - offset;
if (typeof position !== 'number')
position = null;
validateOffsetLengthWrite(offset, length, buffer.byteLength);
const req = new FSReqCallback();
req.oncomplete = wrapper;
binding.writeBuffer(fd, buffer, offset, length, position, req);
return;
}
validateStringAfterArrayBufferView(buffer, 'buffer');
if (typeof position !== 'function') {
if (typeof offset === 'function') {
position = offset;
offset = null;
} else {
position = length;
}
length = 'utf8';
}
const str = buffer;
validateEncoding(str, length);
callback = maybeCallback(position);
const req = new FSReqCallback();
req.oncomplete = wrapper;
binding.writeString(fd, str, offset, length, req);
}
ObjectDefineProperty(write, kCustomPromisifyArgsSymbol,
{ __proto__: null, value: ['bytesWritten', 'buffer'], enumerable: false });
/**
* Synchronously writes `buffer` to the
* specified `fd` (file descriptor).
* @param {number} fd
* @param {Buffer | TypedArray | DataView | string} buffer
* @param {{
* offset?: number;
* length?: number;
* position?: number | null;
* }} [offsetOrOptions]
* @returns {number}
*/
function writeSync(fd, buffer, offsetOrOptions, length, position) {
fd = getValidatedFd(fd);
const ctx = {};
let result;
let offset = offsetOrOptions;
if (isArrayBufferView(buffer)) {
if (typeof offset === 'object') {
({
offset = 0,
length = buffer.byteLength - offset,
position = null,
} = offsetOrOptions ?? kEmptyObject);
}
if (position === undefined)
position = null;
if (offset == null) {
offset = 0;
} else {
validateInteger(offset, 'offset', 0);
}
if (typeof length !== 'number')
length = buffer.byteLength - offset;
validateOffsetLengthWrite(offset, length, buffer.byteLength);
result = binding.writeBuffer(fd, buffer, offset, length, position,
undefined, ctx);
} else {
validateStringAfterArrayBufferView(buffer, 'buffer');
validateEncoding(buffer, length);
if (offset === undefined)
offset = null;
result = binding.writeString(fd, buffer, offset, length,
undefined, ctx);
}
handleErrorFromBinding(ctx);
return result;
}
/**
* Writes an array of `ArrayBufferView`s to the
* specified `fd` (file descriptor).
* @param {number} fd
* @param {ArrayBufferView[]} buffers
* @param {number | null} [position]
* @param {(
* err?: Error,
* bytesWritten?: number,
* buffers?: ArrayBufferView[]
* ) => any} callback
* @returns {void}
*/
function writev(fd, buffers, position, callback) {
function wrapper(err, written) {
callback(err, written || 0, buffers);
}
fd = getValidatedFd(fd);
validateBufferArray(buffers);
callback = maybeCallback(callback || position);
if (buffers.length === 0) {
process.nextTick(callback, null, 0, buffers);
return;
}
const req = new FSReqCallback();
req.oncomplete = wrapper;
if (typeof position !== 'number')
position = null;
binding.writeBuffers(fd, buffers, position, req);
}
ObjectDefineProperty(writev, kCustomPromisifyArgsSymbol, {
__proto__: null,
value: ['bytesWritten', 'buffer'],
enumerable: false,
});
/**
* Synchronously writes an array of `ArrayBufferView`s
* to the specified `fd` (file descriptor).
* @param {number} fd
* @param {ArrayBufferView[]} buffers
* @param {number | null} [position]
* @returns {number}
*/
function writevSync(fd, buffers, position) {
fd = getValidatedFd(fd);
validateBufferArray(buffers);
if (buffers.length === 0) {
return 0;
}
if (typeof position !== 'number')
position = null;
return binding.writeBuffers(fd, buffers, position);
}
/**