All files / lib child_process.js

55.68% Statements 441/792
40.26% Branches 31/77
46.15% Functions 12/26
55.68% Lines 441/792

Press n or j to go to the next uncovered block, b, p or k for the previous block.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 7931x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 95x 95x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x                                                                                                                 1x                           1x                                 1x 1x             1x 1x 190x 91x 91x 91x 91x       91x 91x 91x 91x 91x 91x 190x 1x 1x 1x 1x 1x 1x 1x 273x 273x 273x 273x 273x 273x 273x 273x 273x 273x     273x 273x 273x 273x     273x 273x 273x 273x 273x 273x     273x 273x 273x 273x 273x 273x 273x 273x 273x 273x 273x 273x 273x 273x 273x 273x 273x 273x 273x 273x 273x 273x 273x 273x 273x 273x 273x 273x 273x 273x 273x 273x 273x 273x 273x 273x 273x     273x 273x 273x 273x 273x 273x 273x 273x 273x 273x 273x 273x 273x 273x 273x       273x 273x 273x 273x 273x 273x 273x       273x 273x 273x     273x       273x 273x 273x     273x 273x 273x 273x 273x                             273x 273x 273x                     273x 273x                             273x 273x           273x 273x 273x 273x 273x 273x 683x 683x 683x 683x 683x 683x 683x 683x 683x           683x 683x 683x 273x 273x 273x 273x 273x 273x 273x 273x 91x 91x 91x 91x 91x 91x 91x             91x 91x 91x 273x 273x 273x 273x 273x 273x 273x 273x 1x 1x 1x 1x 1x 1x 461x 461x 461x 461x 461x 461x 461x 461x 461x               461x 461x 461x 455x 455x 461x 461x 461x     461x 461x 461x 461x       461x 461x 461x     461x 461x 461x     461x 461x 461x 461x 461x       461x 461x 461x     461x 461x 461x 461x       461x 461x 461x 461x 461x         461x 461x                                                 461x 461x   461x 461x 461x 461x 461x 461x 461x 461x 461x 461x 461x 188x 188x 461x 461x 461x 461x 32155x 32155x 461x 461x                               461x 461x 32155x 32155x 32155x 32155x 32155x 461x 461x 461x 461x 461x 461x 461x 461x 461x 461x 461x 461x 1x 1x 455x 455x 455x 455x 455x                                           455x 455x 455x 455x 455x 455x 1x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x       6x 6x 6x 18x 18x                             18x 6x 6x 6x 1x 1x                                   1x 1x                                   1x 1x                                 1x 1x 279x 279x     279x 1x 1x 279x 279x         279x 1x 1x 279x 279x 273x 279x         279x 1x 1x 1x 182x 182x 182x 182x 182x 182x 182x 182x 182x                                 182x 182x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x  
// 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.
 
'use strict';
 
const {
  ArrayIsArray,
  ArrayPrototypeFilter,
  ArrayPrototypeIncludes,
  ArrayPrototypeJoin,
  ArrayPrototypeLastIndexOf,
  ArrayPrototypePush,
  ArrayPrototypeSlice,
  ArrayPrototypeSort,
  ArrayPrototypeSplice,
  ArrayPrototypeUnshift,
  Error,
  NumberIsInteger,
  ObjectAssign,
  ObjectDefineProperty,
  ObjectPrototypeHasOwnProperty,
  RegExpPrototypeTest,
  SafeSet,
  StringPrototypeSlice,
  StringPrototypeToUpperCase,
} = primordials;
 
const {
  promisify,
  convertToValidSignal,
  createDeferredPromise,
  getSystemErrorName
} = require('internal/util');
const { isArrayBufferView } = require('internal/util/types');
let debug = require('internal/util/debuglog').debuglog(
  'child_process',
  (fn) => {
    debug = fn;
  }
);
const { Buffer } = require('buffer');
const { Pipe, constants: PipeConstants } = internalBinding('pipe_wrap');
 
const {
  AbortError,
  codes: errorCodes,
} = require('internal/errors');
const {
  ERR_INVALID_ARG_VALUE,
  ERR_CHILD_PROCESS_IPC_REQUIRED,
  ERR_CHILD_PROCESS_STDIO_MAXBUFFER,
  ERR_INVALID_ARG_TYPE,
  ERR_OUT_OF_RANGE,
} = errorCodes;
const { clearTimeout, setTimeout } = require('timers');
const {
  isInt32,
  validateAbortSignal,
  validateObject,
  validateString,
} = require('internal/validators');
const child_process = require('internal/child_process');
const {
  getValidStdio,
  setupChannel,
  ChildProcess,
  stdioStringToArray
} = child_process;
 
const MAX_BUFFER = 1024 * 1024;
 
function fork(modulePath /* , args, options */) {
  validateString(modulePath, 'modulePath');

  // Get options and args arguments.
  let execArgv;
  let options = {};
  let args = [];
  let pos = 1;
  if (pos < arguments.length && ArrayIsArray(arguments[pos])) {
    args = arguments[pos++];
  }

  if (pos < arguments.length &&
      (arguments[pos] === undefined || arguments[pos] === null)) {
    pos++;
  }

  if (pos < arguments.length && arguments[pos] != null) {
    if (typeof arguments[pos] !== 'object') {
      throw new ERR_INVALID_ARG_VALUE(`arguments[${pos}]`, arguments[pos]);
    }

    options = { ...arguments[pos++] };
  }

  // Prepare arguments for fork:
  execArgv = options.execArgv || process.execArgv;

  if (execArgv === process.execArgv && process._eval != null) {
    const index = ArrayPrototypeLastIndexOf(execArgv, process._eval);
    if (index > 0) {
      // Remove the -e switch to avoid fork bombing ourselves.
      execArgv = ArrayPrototypeSlice(execArgv);
      ArrayPrototypeSplice(execArgv, index - 1, 2);
    }
  }

  args = [...execArgv, modulePath, ...args];

  if (typeof options.stdio === 'string') {
    options.stdio = stdioStringToArray(options.stdio, 'ipc');
  } else if (!ArrayIsArray(options.stdio)) {
    // Use a separate fd=3 for the IPC channel. Inherit stdin, stdout,
    // and stderr from the parent if silent isn't set.
    options.stdio = stdioStringToArray(
      options.silent ? 'pipe' : 'inherit',
      'ipc');
  } else if (!ArrayPrototypeIncludes(options.stdio, 'ipc')) {
    throw new ERR_CHILD_PROCESS_IPC_REQUIRED('options.stdio');
  }

  options.execPath = options.execPath || process.execPath;
  options.shell = false;

  return spawn(options.execPath, args, options);
}
 
function _forkChild(fd, serializationMode) {
  // set process.send()
  const p = new Pipe(PipeConstants.IPC);
  p.open(fd);
  p.unref();
  const control = setupChannel(process, p, serializationMode);
  process.on('newListener', function onNewListener(name) {
    if (name === 'message' || name === 'disconnect') control.refCounted();
  });
  process.on('removeListener', function onRemoveListener(name) {
    if (name === 'message' || name === 'disconnect') control.unrefCounted();
  });
}
 
function normalizeExecArgs(command, options, callback) {
  if (typeof options === 'function') {
    callback = options;
    options = undefined;
  }

  // Make a shallow copy so we don't clobber the user's options object.
  options = { ...options };
  options.shell = typeof options.shell === 'string' ? options.shell : true;

  return {
    file: command,
    options: options,
    callback: callback
  };
}
 
 
function exec(command, options, callback) {
  const opts = normalizeExecArgs(command, options, callback);
  return module.exports.execFile(opts.file,
                                 opts.options,
                                 opts.callback);
}
 
const customPromiseExecFunction = (orig) => {
  return (...args) => {
    const { promise, resolve, reject } = createDeferredPromise();
 
    promise.child = orig(...args, (err, stdout, stderr) => {
      if (err !== null) {
        err.stdout = stdout;
        err.stderr = stderr;
        reject(err);
      } else {
        resolve({ stdout, stderr });
      }
    });
 
    return promise;
  };
};
 
ObjectDefineProperty(exec, promisify.custom, {
  enumerable: false,
  value: customPromiseExecFunction(exec)
});
 
function execFile(file /* , args, options, callback */) {
  let args = [];
  let callback;
  let options;
 
  // Parse the optional positional parameters.
  let pos = 1;
  if (pos < arguments.length && ArrayIsArray(arguments[pos])) {
    args = arguments[pos++];
  } else if (pos < arguments.length && arguments[pos] == null) {
    pos++;
  }
 
  if (pos < arguments.length && typeof arguments[pos] === 'object') {
    options = arguments[pos++];
  } else if (pos < arguments.length && arguments[pos] == null) {
    pos++;
  }
 
  if (pos < arguments.length && typeof arguments[pos] === 'function') {
    callback = arguments[pos++];
  }
 
  if (!callback && pos < arguments.length && arguments[pos] != null) {
    throw new ERR_INVALID_ARG_VALUE('args', arguments[pos]);
  }
 
  options = {
    encoding: 'utf8',
    timeout: 0,
    maxBuffer: MAX_BUFFER,
    killSignal: 'SIGTERM',
    cwd: null,
    env: null,
    shell: false,
    ...options
  };
 
  // Validate the timeout, if present.
  validateTimeout(options.timeout);
 
  // Validate maxBuffer, if present.
  validateMaxBuffer(options.maxBuffer);
 
  options.killSignal = sanitizeKillSignal(options.killSignal);
 
  const child = spawn(file, args, {
    cwd: options.cwd,
    env: options.env,
    gid: options.gid,
    shell: options.shell,
    signal: options.signal,
    uid: options.uid,
    windowsHide: !!options.windowsHide,
    windowsVerbatimArguments: !!options.windowsVerbatimArguments
  });
 
  let encoding;
  const _stdout = [];
  const _stderr = [];
  if (options.encoding !== 'buffer' && Buffer.isEncoding(options.encoding)) {
    encoding = options.encoding;
  } else {
    encoding = null;
  }
  let stdoutLen = 0;
  let stderrLen = 0;
  let killed = false;
  let exited = false;
  let timeoutId;
 
  let ex = null;
 
  let cmd = file;
 
  function exithandler(code, signal) {
    if (exited) return;
    exited = true;
 
    if (timeoutId) {
      clearTimeout(timeoutId);
      timeoutId = null;
    }
 
    if (!callback) return;
 
    // merge chunks
    let stdout;
    let stderr;
    if (encoding ||
      (
        child.stdout &&
        child.stdout.readableEncoding
      )) {
      stdout = ArrayPrototypeJoin(_stdout, '');
    } else {
      stdout = Buffer.concat(_stdout);
    }
    if (encoding ||
      (
        child.stderr &&
        child.stderr.readableEncoding
      )) {
      stderr = ArrayPrototypeJoin(_stderr, '');
    } else {
      stderr = Buffer.concat(_stderr);
    }
 
    if (!ex && code === 0 && signal === null) {
      callback(null, stdout, stderr);
      return;
    }

    if (args.length !== 0)
      cmd += ` ${ArrayPrototypeJoin(args, ' ')}`;

    if (!ex) {
      // eslint-disable-next-line no-restricted-syntax
      ex = new Error('Command failed: ' + cmd + '\n' + stderr);
      ex.killed = child.killed || killed;
      ex.code = code < 0 ? getSystemErrorName(code) : code;
      ex.signal = signal;
    }

    ex.cmd = cmd;
    callback(ex, stdout, stderr);
  }
 
  function errorhandler(e) {
    ex = e;

    if (child.stdout)
      child.stdout.destroy();

    if (child.stderr)
      child.stderr.destroy();

    exithandler();
  }
 
  function kill() {
    if (child.stdout)
      child.stdout.destroy();

    if (child.stderr)
      child.stderr.destroy();

    killed = true;
    try {
      child.kill(options.killSignal);
    } catch (e) {
      ex = e;
      exithandler();
    }
  }
 
  if (options.timeout > 0) {
    timeoutId = setTimeout(function delayedKill() {
      kill();
      timeoutId = null;
    }, options.timeout);
  }
 
  if (child.stdout) {
    if (encoding)
      child.stdout.setEncoding(encoding);
 
    child.stdout.on('data', function onChildStdout(chunk) {
      const encoding = child.stdout.readableEncoding;
      const length = encoding ?
        Buffer.byteLength(chunk, encoding) :
        chunk.length;
      const slice = encoding ? StringPrototypeSlice :
        (buf, ...args) => buf.slice(...args);
      stdoutLen += length;
 
      if (stdoutLen > options.maxBuffer) {
        const truncatedLen = options.maxBuffer - (stdoutLen - length);
        ArrayPrototypePush(_stdout, slice(chunk, 0, truncatedLen));

        ex = new ERR_CHILD_PROCESS_STDIO_MAXBUFFER('stdout');
        kill();
      } else {
        ArrayPrototypePush(_stdout, chunk);
      }
    });
  }
 
  if (child.stderr) {
    if (encoding)
      child.stderr.setEncoding(encoding);
 
    child.stderr.on('data', function onChildStderr(chunk) {
      const encoding = child.stderr.readableEncoding;
      const length = encoding ?
        Buffer.byteLength(chunk, encoding) :
        chunk.length;
      stderrLen += length;
 
      if (stderrLen > options.maxBuffer) {
        const truncatedLen = options.maxBuffer - (stderrLen - length);
        ArrayPrototypePush(_stderr,
                           chunk.slice(0, truncatedLen));

        ex = new ERR_CHILD_PROCESS_STDIO_MAXBUFFER('stderr');
        kill();
      } else {
        _stderr.push(chunk);
      }
    });
  }
 
  child.addListener('close', exithandler);
  child.addListener('error', errorhandler);
 
  return child;
}
 
ObjectDefineProperty(execFile, promisify.custom, {
  enumerable: false,
  value: customPromiseExecFunction(execFile)
});
 
function normalizeSpawnArguments(file, args, options) {
  validateString(file, 'file');
 
  if (file.length === 0)
    throw new ERR_INVALID_ARG_VALUE('file', file, 'cannot be empty');
 
  if (ArrayIsArray(args)) {
    args = ArrayPrototypeSlice(args);
  } else if (args == null) {
    args = [];
  } else if (typeof args !== 'object') {
    throw new ERR_INVALID_ARG_TYPE('args', 'object', args);
  } else {
    options = args;
    args = [];
  }
 
  if (options === undefined)
    options = {};
  else
    validateObject(options, 'options');
 
  // Validate the cwd, if present.
  if (options.cwd != null) {
    validateString(options.cwd, 'options.cwd');
  }
 
  // Validate detached, if present.
  if (options.detached != null &&
      typeof options.detached !== 'boolean') {
    throw new ERR_INVALID_ARG_TYPE('options.detached',
                                   'boolean', options.detached);
  }
 
  // Validate the uid, if present.
  if (options.uid != null && !isInt32(options.uid)) {
    throw new ERR_INVALID_ARG_TYPE('options.uid', 'int32', options.uid);
  }
 
  // Validate the gid, if present.
  if (options.gid != null && !isInt32(options.gid)) {
    throw new ERR_INVALID_ARG_TYPE('options.gid', 'int32', options.gid);
  }
 
  // Validate the shell, if present.
  if (options.shell != null &&
      typeof options.shell !== 'boolean' &&
      typeof options.shell !== 'string') {
    throw new ERR_INVALID_ARG_TYPE('options.shell',
                                   ['boolean', 'string'], options.shell);
  }
 
  // Validate argv0, if present.
  if (options.argv0 != null) {
    validateString(options.argv0, 'options.argv0');
  }
 
  // Validate windowsHide, if present.
  if (options.windowsHide != null &&
      typeof options.windowsHide !== 'boolean') {
    throw new ERR_INVALID_ARG_TYPE('options.windowsHide',
                                   'boolean', options.windowsHide);
  }
 
  // Validate windowsVerbatimArguments, if present.
  let { windowsVerbatimArguments } = options;
  if (windowsVerbatimArguments != null &&
      typeof windowsVerbatimArguments !== 'boolean') {
    throw new ERR_INVALID_ARG_TYPE('options.windowsVerbatimArguments',
                                   'boolean',
                                   windowsVerbatimArguments);
  }
 
  if (options.shell) {
    const command = ArrayPrototypeJoin([file, ...args], ' ');
    // Set the shell, switches, and commands.
    if (process.platform === 'win32') {
      if (typeof options.shell === 'string')
        file = options.shell;
      else
        file = process.env.comspec || 'cmd.exe';
      // '/d /s /c' is used only for cmd.exe.
      if (RegExpPrototypeTest(/^(?:.*\\)?cmd(?:\.exe)?$/i, file)) {
        args = ['/d', '/s', '/c', `"${command}"`];
        windowsVerbatimArguments = true;
      } else {
        args = ['-c', command];
      }
    } else {
      if (typeof options.shell === 'string')
        file = options.shell;
      else if (process.platform === 'android')
        file = '/system/bin/sh';
      else
        file = '/bin/sh';
      args = ['-c', command];
    }
  }
 
  if (typeof options.argv0 === 'string') {
    ArrayPrototypeUnshift(args, options.argv0);
  } else {
    ArrayPrototypeUnshift(args, file);
  }
 
  const env = options.env || process.env;
  const envPairs = [];
 
  // process.env.NODE_V8_COVERAGE always propagates, making it possible to
  // collect coverage for programs that spawn with white-listed environment.
  if (process.env.NODE_V8_COVERAGE &&
      !ObjectPrototypeHasOwnProperty(options.env || {}, 'NODE_V8_COVERAGE')) {
    env.NODE_V8_COVERAGE = process.env.NODE_V8_COVERAGE;
  }
 
  let envKeys = [];
  // Prototype values are intentionally included.
  for (const key in env) {
    ArrayPrototypePush(envKeys, key);
  }
 
  if (process.platform === 'win32') {
    // On Windows env keys are case insensitive. Filter out duplicates,
    // keeping only the first one (in lexicographic order)
    const sawKey = new SafeSet();
    envKeys = ArrayPrototypeFilter(
      ArrayPrototypeSort(envKeys),
      (key) => {
        const uppercaseKey = StringPrototypeToUpperCase(key);
        if (sawKey.has(uppercaseKey)) {
          return false;
        }
        sawKey.add(uppercaseKey);
        return true;
      }
    );
  }
 
  for (const key of envKeys) {
    const value = env[key];
    if (value !== undefined) {
      ArrayPrototypePush(envPairs, `${key}=${value}`);
    }
  }
 
  return {
    // Make a shallow copy so we don't clobber the user's options object.
    ...options,
    args,
    detached: !!options.detached,
    envPairs,
    file,
    windowsHide: !!options.windowsHide,
    windowsVerbatimArguments: !!windowsVerbatimArguments
  };
}
 
 
function spawn(file, args, options) {
  const child = new ChildProcess();
  options = normalizeSpawnArguments(file, args, options);
 
  if (options.signal) {
    const signal = options.signal;
    // Validate signal, if present
    validateAbortSignal(signal, 'options.signal');

    // Do nothing and throw if already aborted
    if (signal.aborted) {
      onAbortListener();
    } else {
      signal.addEventListener('abort', onAbortListener, { once: true });
      child.once('close',
                 () => signal.removeEventListener('abort', onAbortListener));
    }

    function onAbortListener() {
      process.nextTick(() => {
        child?.kill?.(options.killSignal);

        child.emit('error', new AbortError());
      });
    }
  }
 
  debug('spawn', options);
  child.spawn(options);
 
  return child;
}
 
function spawnSync(file, args, options) {
  options = {
    maxBuffer: MAX_BUFFER,
    ...normalizeSpawnArguments(file, args, options)
  };
 
  debug('spawnSync', options);
 
  // Validate the timeout, if present.
  validateTimeout(options.timeout);
 
  // Validate maxBuffer, if present.
  validateMaxBuffer(options.maxBuffer);
 
  // Validate and translate the kill signal, if present.
  options.killSignal = sanitizeKillSignal(options.killSignal);
 
  options.stdio = getValidStdio(options.stdio || 'pipe', true).stdio;
 
  if (options.input) {
    const stdin = options.stdio[0] = { ...options.stdio[0] };
    stdin.input = options.input;
  }
 
  // We may want to pass data in on any given fd, ensure it is a valid buffer
  for (let i = 0; i < options.stdio.length; i++) {
    const input = options.stdio[i] && options.stdio[i].input;
    if (input != null) {
      const pipe = options.stdio[i] = { ...options.stdio[i] };
      if (isArrayBufferView(input)) {
        pipe.input = input;
      } else if (typeof input === 'string') {
        pipe.input = Buffer.from(input, options.encoding);
      } else {
        throw new ERR_INVALID_ARG_TYPE(`options.stdio[${i}]`,
                                       ['Buffer',
                                        'TypedArray',
                                        'DataView',
                                        'string'],
                                       input);
      }
    }
  }
 
  return child_process.spawnSync(options);
}
 
 
function checkExecSyncError(ret, args, cmd) {
  let err;
  if (ret.error) {
    err = ret.error;
  } else if (ret.status !== 0) {
    let msg = 'Command failed: ';
    msg += cmd || ArrayPrototypeJoin(args, ' ');
    if (ret.stderr && ret.stderr.length > 0)
      msg += `\n${ret.stderr.toString()}`;
    // eslint-disable-next-line no-restricted-syntax
    err = new Error(msg);
  }
  if (err) {
    ObjectAssign(err, ret);
  }
  return err;
}
 
 
function execFileSync(command, args, options) {
  options = normalizeSpawnArguments(command, args, options);

  const inheritStderr = !options.stdio;
  const ret = spawnSync(options.file,
                        ArrayPrototypeSlice(options.args, 1), options);

  if (inheritStderr && ret.stderr)
    process.stderr.write(ret.stderr);

  const err = checkExecSyncError(ret, options.args, undefined);

  if (err)
    throw err;

  return ret.stdout;
}
 
 
function execSync(command, options) {
  const opts = normalizeExecArgs(command, options, null);
  const inheritStderr = !opts.options.stdio;

  const ret = spawnSync(opts.file, opts.options);

  if (inheritStderr && ret.stderr)
    process.stderr.write(ret.stderr);

  const err = checkExecSyncError(ret, opts.args, command);

  if (err)
    throw err;

  return ret.stdout;
}
 
 
function validateTimeout(timeout) {
  if (timeout != null && !(NumberIsInteger(timeout) && timeout >= 0)) {
    throw new ERR_OUT_OF_RANGE('timeout', 'an unsigned integer', timeout);
  }
}
 
 
function validateMaxBuffer(maxBuffer) {
  if (maxBuffer != null && !(typeof maxBuffer === 'number' && maxBuffer >= 0)) {
    throw new ERR_OUT_OF_RANGE('options.maxBuffer',
                               'a positive number',
                               maxBuffer);
  }
}
 
 
function sanitizeKillSignal(killSignal) {
  if (typeof killSignal === 'string' || typeof killSignal === 'number') {
    return convertToValidSignal(killSignal);
  } else if (killSignal != null) {
    throw new ERR_INVALID_ARG_TYPE('options.killSignal',
                                   ['string', 'number'],
                                   killSignal);
  }
}
 
// This level of indirection is here because the other child_process methods
// call spawn internally but should use different cancellation logic.
function spawnWithSignal(file, args, options) {
  // Remove signal from options to spawn
  // to avoid double emitting of AbortError
  const opts = options && typeof options === 'object' && ('signal' in options) ?
    { ...options, signal: undefined } :
    options;
  const child = spawn(file, args, opts);
 
  if (options && options.signal) {
    // Validate signal, if present
    validateAbortSignal(options.signal, 'options.signal');
    function kill() {
      if (child._handle) {
        child._handle.kill(options.killSignal || 'SIGTERM');
        child.emit('error', new AbortError());
      }
    }
    if (options.signal.aborted) {
      process.nextTick(kill);
    } else {
      options.signal.addEventListener('abort', kill);
      const remove = () => options.signal.removeEventListener('abort', kill);
      child.once('close', remove);
    }
  }
  return child;
}
module.exports = {
  _forkChild,
  ChildProcess,
  exec,
  execFile,
  execFileSync,
  execSync,
  fork,
  spawn: spawnWithSignal,
  spawnSync
};