Namespace node.process

Field Detail

    // print process.argv
    process.argv.forEach(function (val, index, array) {
      console.log(index + ': ' + val);
    });

    $ node process-2.js one two=three four
    0: node
    1: /Users/mjr/work/node/process-2.js
    2: one
    3: two=three
    4: four

    /usr/local/bin/node

    console.log('Prefix: ' + process.installPrefix);

    console.log('This process is pid ' + process.pid);

    console.log('This platform is ' + process.platform);

    process.stdin.resume();
    process.stdin.setEncoding('utf8');

    process.stdin.on('data', function (chunk) {
      process.stdout.write('data: ' + chunk);
    });

    process.stdin.on('end', function () {
      process.stdout.write('end');
    });

    console.log = function (d) {
      process.stdout.write(d + '\n');
    };

    console.log('Version: ' + process.version);

Method Detail

• static node.process.addListener(type, listener)

  Parameters:

  {string} type

  {string} listener
• static node.process.assert()
• static node.process.binding()
• static node.process.chdir()
  Changes the current working directory of the process or throws an exception if that fails.

      console.log('Starting directory: ' + process.cwd());
      try {
        process.chdir('/tmp');
        console.log('New directory: ' + process.cwd());
      }
      catch (err) {
        console.log('chdir: ' + err);
      }
  
• static node.process.compile()
• static node.process.createChildProcess()
• static node.process.cwd()
  Returns the current working directory of the process.

      console.log('Current directory: ' + process.cwd());
  
• static node.process.debug()
• static node.process.dlopen()
• static node.process.emit(type)

  Parameters:

  {string} type
• static node.process.error()
• static node.process.exit(code)
  Ends the process with the specified code. If omitted, exit uses the 'success' code 0. To exit with a 'failure' code:

      process.exit(1);
  

  The shell that executed node should see the exit code as 1.

  Parameters:

  {string} code
• static node.process.getgid()
  Gets the group identity of the process. (See getgid(2).) This is the numerical group id, not the group name.

      console.log('Current gid: ' + process.getgid());
  
• static node.process.getuid()
  Gets the user identity of the process. (See getuid(2).) This is the numerical userid, not the username.

      console.log('Current uid: ' + process.getuid());
  
• static node.process.inherits()
• static node.process.kill(pid, sig)
  Send a signal to a process. pid is the process id and signal is the string describing the signal to send. Signal names are strings like 'SIGINT' or 'SIGUSR1'. If omitted, the signal will be 'SIGTERM'. See kill(2) for more information. Note that just because the name of this function is process.kill, it is really just a signal sender, like the kill system call. The signal sent may do something other than kill the target process. Example of sending a signal to yourself:

      process.on('SIGHUP', function () {
        console.log('Got SIGHUP signal.');
      });
  
      setTimeout(function () {
        console.log('Exiting.');
        process.exit(0);
      }, 100);
  
      process.kill(process.pid, 'SIGHUP');
  

  Parameters:

  {string} pid

  {string} sig
• static node.process.listeners(type)

  Parameters:

  {string} type
• static node.process.memoryUsage()
  Returns an object describing the memory usage of the Node process.

      var util = require('util');
  
      console.log(util.inspect(process.memoryUsage()));
  

  This will generate:

      { rss: 4935680,
        vsize: 41893888,
        heapTotal: 1826816,
        heapUsed: 650472 }
  

  heapTotal and heapUsed refer to V8's memory usage.
• static node.process.mixin()
• static node.process.nextTick(callback)
  On the next loop around the event loop call this callback. This is *not* a simple alias to setTimeout(fn, 0), it's much more efficient.

      process.nextTick(function () {
        console.log('nextTick callback');
      });
  

  Parameters:

  {function(Error?|...[*]):undefined=} callback
• static node.process.on(type, listener)

  Parameters:

  {string} type

  {string} listener
• static node.process.once(type, listener)

  Parameters:

  {string} type

  {string} listener
• static node.process.openStdin()
• static node.process.reallyExit()
• static node.process.removeAllListeners(type)

  Parameters:

  {string} type
• static node.process.removeListener(type, listener)

  Parameters:

  {string} type

  {string} listener
• static node.process.setgid()
  Sets the group identity of the process. (See setgid(2).) This accepts either a numerical ID or a groupname string. If a groupname is specified, this method blocks while resolving it to a numerical ID.

      console.log('Current gid: ' + process.getgid());
      try {
        process.setgid(501);
        console.log('New gid: ' + process.getgid());
      }
      catch (err) {
        console.log('Failed to set gid: ' + err);
      }
  
• static node.process.setMaxListeners(n)

  Parameters:

  {string} n
• static node.process.setuid()
  Sets the user identity of the process. (See setuid(2).) This accepts either a numerical ID or a username string. If a username is specified, this method blocks while resolving it to a numerical ID.

      console.log('Current uid: ' + process.getuid());
      try {
        process.setuid(501);
        console.log('New uid: ' + process.getuid());
      }
      catch (err) {
        console.log('Failed to set uid: ' + err);
      }
  
• static node.process.umask()
  Sets or reads the process's file mode creation mask. Child processes inherit the mask from the parent process. Returns the old mask if mask argument is given, otherwise returns the current mask.

      var oldmask, newmask = 0644;
  
      oldmask = process.umask(newmask);
      console.log('Changed umask from: ' + oldmask.toString(8) +
                  ' to ' + newmask.toString(8));
  
• static node.process.unwatchFile()
• static node.process.watchFile()