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'use strict';
const { guessHandleType } = internalBinding('util');
exports.getMainThreadStdio = getMainThreadStdio;
function dummyDestroy(err, cb) {
cb(err);
// We need to emit 'close' anyway so that the closing
// of the stream is observable. We just make sure we
// are not going to do it twice.
// The 'close' event is needed so that finished and
// pipeline work correctly.
if (!this._writableState.emitClose) {
process.nextTick(() => {
this.emit('close');
});
}
}
function getMainThreadStdio() {
let stdin;
let stdout;
let stderr;
function getStdout() {
if (stdout) return stdout;
stdout = createWritableStdioStream(1);
stdout.destroySoon = stdout.destroy;
// Override _destroy so that the fd is never actually closed.
stdout._destroy = dummyDestroy;
if (stdout.isTTY) {
process.on('SIGWINCH', () => stdout._refreshSize());
}
return stdout;
}
function getStderr() {
if (stderr) return stderr;
stderr = createWritableStdioStream(2);
stderr.destroySoon = stderr.destroy;
// Override _destroy so that the fd is never actually closed.
stderr._destroy = dummyDestroy;
if (stderr.isTTY) {
process.on('SIGWINCH', () => stderr._refreshSize());
}
return stderr;
}
function getStdin() {
if (stdin) return stdin;
const fd = 0;
switch (guessHandleType(fd)) {
case 'TTY':
const tty = require('tty');
stdin = new tty.ReadStream(fd, {
highWaterMark: 0,
readable: true,
writable: false
});
break;
case 'FILE':
const fs = require('fs');
stdin = new fs.ReadStream(null, { fd: fd, autoClose: false });
break;
case 'PIPE':
case 'TCP':
const net = require('net');
// It could be that process has been started with an IPC channel
// sitting on fd=0, in such case the pipe for this fd is already
// present and creating a new one will lead to the assertion failure
// in libuv.
if (process.channel && process.channel.fd === fd) {
stdin = new net.Socket({
handle: process.channel,
readable: true,
writable: false,
manualStart: true
});
} else {
stdin = new net.Socket({
fd: fd,
readable: true,
writable: false,
manualStart: true
});
}
// Make sure the stdin can't be `.end()`-ed
stdin._writableState.ended = true;
break;
default:
// Provide a dummy contentless input for e.g. non-console
// Windows applications.
const { Readable } = require('stream');
stdin = new Readable({ read() {} });
stdin.push(null);
}
// For supporting legacy API we put the FD here.
stdin.fd = fd;
// `stdin` starts out life in a paused state, but node doesn't
// know yet. Explicitly to readStop() it to put it in the
// not-reading state.
if (stdin._handle && stdin._handle.readStop) {
stdin._handle.reading = false;
stdin._readableState.reading = false;
stdin._handle.readStop();
}
// If the user calls stdin.pause(), then we need to stop reading
// once the stream implementation does so (one nextTick later),
// so that the process can close down.
stdin.on('pause', () => {
process.nextTick(onpause);
});
function onpause() {
if (!stdin._handle)
return;
if (stdin._handle.reading && !stdin.readableFlowing) {
stdin._readableState.reading = false;
stdin._handle.reading = false;
stdin._handle.readStop();
}
}
return stdin;
}
exports.resetStdioForTesting = function() {
stdin = undefined;
stdout = undefined;
stderr = undefined;
};
return {
getStdout,
getStderr,
getStdin
};
}
function createWritableStdioStream(fd) {
let stream;
// Note stream._type is used for test-module-load-list.js
switch (guessHandleType(fd)) {
case 'TTY':
const tty = require('tty');
stream = new tty.WriteStream(fd);
stream._type = 'tty';
break;
case 'FILE':
const SyncWriteStream = require('internal/fs/sync_write_stream');
stream = new SyncWriteStream(fd, { autoClose: false });
stream._type = 'fs';
break;
case 'PIPE':
case 'TCP':
const net = require('net');
// If fd is already being used for the IPC channel, libuv will return
// an error when trying to use it again. In that case, create the socket
// using the existing handle instead of the fd.
if (process.channel && process.channel.fd === fd) {
stream = new net.Socket({
handle: process.channel,
readable: false,
writable: true
});
} else {
stream = new net.Socket({
fd,
readable: false,
writable: true
});
}
stream._type = 'pipe';
break;
default:
// Provide a dummy black-hole output for e.g. non-console
// Windows applications.
const { Writable } = require('stream');
stream = new Writable({
write(buf, enc, cb) {
cb();
}
});
}
// For supporting legacy API we put the FD here.
stream.fd = fd;
stream._isStdio = true;
return stream;
}
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