229 function stdioStringToArray(stdio, channel) {  argument
232   switch (stdio) {
235     case 'pipe': options.push(stdio, stdio, stdio); break;
238       throw new ERR_INVALID_OPT_VALUE('stdio', stdio);
304   const stdio = subprocess.stdio;
306   if (stdio == null) return;
308   for (let i = 0; i < stdio.length; i++) {
309     const stream = stdio[i];
349   let stdio = options.stdio || 'pipe';
351   stdio = getValidStdio(stdio, false);
353   const ipc = stdio.ipc;
354   const ipcFd = stdio.ipcFd;
355   stdio = options.stdio = stdio.stdio;
399     for (i = 0; i < stdio.length; i++) {
400       const stream = stdio[i];
415   for (i = 0; i < stdio.length; i++) {
416     const stream = stdio[i];
452   this.stdin = stdio.length >= 1 && stdio[0].socket !== undefined ?
453     stdio[0].socket : null;
454   this.stdout = stdio.length >= 2 && stdio[1].socket !== undefined ?
455     stdio[1].socket : null;
456   this.stderr = stdio.length >= 3 && stdio[2].socket !== undefined ?
457     stdio[2].socket : null;
459   this.stdio = [];  property
461   for (i = 0; i < stdio.length; i++)
462     this.stdio.push(stdio[i].socket === undefined ? null : stdio[i].socket);
969 function getValidStdio(stdio, sync) {  argument
974   if (typeof stdio === 'string') {
975     stdio = stdioStringToArray(stdio);
976   } else if (!ArrayIsArray(stdio)) {
977     throw new ERR_INVALID_OPT_VALUE('stdio', stdio);
984   while (stdio.length < 3) stdio.push(undefined);
988   stdio = stdio.reduce((acc, stdio, i) => {
997     if (stdio == null) {
998       stdio = i < 3 ? 'pipe' : 'ignore';
1001     if (stdio === 'ignore') {
1003     } else if (stdio === 'pipe' || stdio === 'overlapped' ||
1004                (typeof stdio === 'number' && stdio < 0)) {
1006         type: stdio === 'overlapped' ? 'overlapped' : 'pipe',
1015     } else if (stdio === 'ipc') {
1033     } else if (stdio === 'inherit') {
1038     } else if (typeof stdio === 'number' || typeof stdio.fd === 'number') {
1041         fd: typeof stdio === 'number' ? stdio : stdio.fd
1043     } else if (getHandleWrapType(stdio) || getHandleWrapType(stdio.handle) ||
1044                getHandleWrapType(stdio._handle)) {
1045       const handle = getHandleWrapType(stdio) ?
1046         stdio :
1047         getHandleWrapType(stdio.handle) ? stdio.handle : stdio._handle;
1053         _stdio: stdio
1055     } else if (isArrayBufferView(stdio) || typeof stdio === 'string') {
1058         throw new ERR_INVALID_SYNC_FORK_INPUT(inspect(stdio));
1063       throw new ERR_INVALID_OPT_VALUE('stdio', stdio);
1069   return { stdio, ipc, ipcFd };