Function getStdin

lib/internal/bootstrap/switches/is_main_thread.js:194–284

()

}

function getStdin() {
  if (stdin) return stdin;
  const fd = 0;

  switch (guessHandleType(fd)) {
    case 'TTY': {
      const tty = require('tty');
      stdin = new tty.ReadStream(fd);
      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