node/src/node.js at master · deepu105/node · GitHub

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// 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.

// Hello, and welcome to hacking node.js!

// This file is invoked by node::Load in src/node.cc, and responsible for

// bootstrapping the node.js core. Special caution is given to the performance

// of the startup process, so many dependencies are invoked lazily.

(function(process) {

global = this;

function startup() {

var EventEmitter = NativeModule.require('events').EventEmitter;

process.__proto__ = EventEmitter.prototype;

process.EventEmitter = EventEmitter; // process.EventEmitter is deprecated

startup.globalVariables();

startup.globalTimeouts();

startup.globalConsole();

startup.processAssert();

startup.processNextTick();

startup.processStdio();

startup.processKillAndExit();

startup.processSignalHandlers();

startup.processChannel();

startup.resolveArgv0();

// There are various modes that Node can run in. The most common two

// are running from a script and running the REPL - but there are a few

// others like the debugger or running --eval arguments. Here we decide

// which mode we run in.

if (NativeModule.exists('_third_party_main')) {

// To allow people to extend Node in different ways, this hook allows

// one to drop a file lib/_third_party_main.js into the build

// directory which will be executed instead of Node's normal loading.

process.nextTick(function() {

NativeModule.require('_third_party_main');

});

} else if (process.argv[1] == 'debug') {

// Start the debugger agent

var d = NativeModule.require('_debugger');

d.start();

} else if (process._eval != null) {

// User passed '-e' or '--eval' arguments to Node.

var Module = NativeModule.require('module');

var path = NativeModule.require('path');

var cwd = process.cwd();

var module = new Module('eval');

module.filename = path.join(cwd, 'eval');

module.paths = Module._nodeModulePaths(cwd);

var result = module._compile('return eval(process._eval)', 'eval');

if (process._print_eval) console.log(result);

} else if (process.argv[1]) {

// make process.argv[1] into a full path

var path = NativeModule.require('path');

process.argv[1] = path.resolve(process.argv[1]);

// If this is a worker in cluster mode, start up the communiction

// channel.

if (process.env.NODE_UNIQUE_ID) {

var cluster = NativeModule.require('cluster');

cluster._setupWorker();

}

var Module = NativeModule.require('module');

// REMOVEME: nextTick should not be necessary. This hack to get

// test/simple/test-exception-handler2.js working.

// Main entry point into most programs:

process.nextTick(Module.runMain);

} else {

var Module = NativeModule.require('module');

// If stdin is a TTY.

if (NativeModule.require('tty').isatty(0)) {

// REPL

var repl = Module.requireRepl().start('> ', null, null, true);

} else {

// Read all of stdin - execute it.

process.stdin.resume();

process.stdin.setEncoding('utf8');

var code = '';

process.stdin.on('data', function(d) {

code += d;

});

process.stdin.on('end', function() {

new Module()._compile(code, '[stdin]');

});

}

startup.globalVariables = function() {

global.process = process;

global.global = global;

global.GLOBAL = global;

global.root = global;

global.Buffer = NativeModule.require('buffer').Buffer;

};

startup.globalTimeouts = function() {

global.setTimeout = function() {

var t = NativeModule.require('timers');

return t.setTimeout.apply(this, arguments);

};

global.setInterval = function() {

var t = NativeModule.require('timers');

return t.setInterval.apply(this, arguments);

};

global.clearTimeout = function() {

var t = NativeModule.require('timers');

return t.clearTimeout.apply(this, arguments);

};

global.clearInterval = function() {

var t = NativeModule.require('timers');

return t.clearInterval.apply(this, arguments);

};

startup.globalConsole = function() {

global.__defineGetter__('console', function() {

return NativeModule.require('console');

});

};

startup._lazyConstants = null;

startup.lazyConstants = function() {

if (!startup._lazyConstants) {

startup._lazyConstants = process.binding('constants');

}

return startup._lazyConstants;

};

var assert;

startup.processAssert = function() {

// Note that calls to assert() are pre-processed out by JS2C for the

// normal build of node. They persist only in the node_g build.

// Similarly for debug().

assert = process.assert = function(x, msg) {

if (!x) throw new Error(msg || 'assertion error');

};

startup.processNextTick = function() {

var nextTickQueue = [];

process._tickCallback = function() {

var l = nextTickQueue.length;

if (l === 0) return;

var q = nextTickQueue;

nextTickQueue = [];

try {

for (var i = 0; i < l; i++) q[i]();

}

catch (e) {

if (i + 1 < l) {

nextTickQueue = q.slice(i + 1).concat(nextTickQueue);

}

if (nextTickQueue.length) {

process._needTickCallback();

}

throw e; // process.nextTick error, or 'error' event on first tick

}

};

process.nextTick = function(callback) {

nextTickQueue.push(callback);

process._needTickCallback();

};

function errnoException(errorno, syscall) {

// TODO make this more compatible with ErrnoException from src/node.cc

// Once all of Node is using this function the ErrnoException from

// src/node.cc should be removed.

var e = new Error(syscall + ' ' + errorno);

e.errno = e.code = errorno;

e.syscall = syscall;

return e;

}

function createWritableStdioStream(fd) {

var stream;

var tty_wrap = process.binding('tty_wrap');

// Note stream._type is used for test-module-load-list.js

switch (tty_wrap.guessHandleType(fd)) {

case 'TTY':

var tty = NativeModule.require('tty');

stream = new tty.WriteStream(fd);

stream._type = 'tty';

// Hack to have stream not keep the event loop alive.

// See https://github.com/joyent/node/issues/1726

if (stream._handle && stream._handle.unref) {

stream._handle.unref();

}

break;

case 'FILE':

var fs = NativeModule.require('fs');

stream = new fs.SyncWriteStream(fd);

stream._type = 'fs';

break;

case 'PIPE':

var net = NativeModule.require('net');

stream = new net.Stream(fd);

// FIXME Should probably have an option in net.Stream to create a

// stream from an existing fd which is writable only. But for now

// we'll just add this hack and set the `readable` member to false.

// Test: ./node test/fixtures/echo.js < /etc/passwd

stream.readable = false;

stream._type = 'pipe';

// FIXME Hack to have stream not keep the event loop alive.

// See https://github.com/joyent/node/issues/1726

if (stream._handle && stream._handle.unref) {

stream._handle.unref();

}

break;

default:

// Probably an error on in uv_guess_handle()

throw new Error('Implement me. Unknown stream file type!');

}

// For supporting legacy API we put the FD here.

stream.fd = fd;

stream._isStdio = true;

return stream;

}

startup.processStdio = function() {

var stdin, stdout, stderr;

process.__defineGetter__('stdout', function() {

if (stdout) return stdout;

stdout = createWritableStdioStream(1);

stdout.destroy = stdout.destroySoon = function(er) {

er = er || new Error('process.stdout cannot be closed.');

stdout.emit('error', er);

};

return stdout;

});

process.__defineGetter__('stderr', function() {

if (stderr) return stderr;

stderr = createWritableStdioStream(2);

stderr.destroy = stderr.destroySoon = function(er) {

er = er || new Error('process.stderr cannot be closed.');

stderr.emit('error', er);

};

return stderr;

});

process.__defineGetter__('stdin', function() {

if (stdin) return stdin;

var tty_wrap = process.binding('tty_wrap');

var fd = 0;

switch (tty_wrap.guessHandleType(fd)) {

case 'TTY':

var tty = NativeModule.require('tty');

stdin = new tty.ReadStream(fd);

break;

case 'FILE':

var fs = NativeModule.require('fs');

stdin = new fs.ReadStream(null, {fd: fd});

break;

case 'PIPE':

var net = NativeModule.require('net');

stdin = new net.Stream(fd);

stdin.readable = true;

break;

default:

// Probably an error on in uv_guess_handle()

throw new Error('Implement me. Unknown stdin file type!');

}

// 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. Call pause() explicitly to unref() it.

stdin.pause();

return stdin;

});

process.openStdin = function() {

process.stdin.resume();

return process.stdin;

};

startup.processKillAndExit = function() {

var exiting = false;

process.exit = function(code) {

if (!exiting) {

exiting = true;

process.emit('exit', code || 0);

}

process.reallyExit(code || 0);

};

process.kill = function(pid, sig) {

var r;

// preserve null signal

if (0 === sig) {

r = process._kill(pid, 0);

} else {

sig = sig || 'SIGTERM';

if (startup.lazyConstants()[sig]) {

r = process._kill(pid, startup.lazyConstants()[sig]);

} else {

throw new Error('Unknown signal: ' + sig);

}

if (r) {

throw errnoException(errno, 'kill');

}

};

startup.processSignalHandlers = function() {

// Load events module in order to access prototype elements on process like

// process.addListener.

var signalWatchers = {};

var addListener = process.addListener;

var removeListener = process.removeListener;

function isSignal(event) {

return event.slice(0, 3) === 'SIG' && startup.lazyConstants()[event];

}

// Wrap addListener for the special signal types

process.on = process.addListener = function(type, listener) {

var ret = addListener.apply(this, arguments);

if (isSignal(type)) {

if (!signalWatchers.hasOwnProperty(type)) {

var b = process.binding('signal_watcher');

var w = new b.SignalWatcher(startup.lazyConstants()[type]);

w.callback = function() { process.emit(type); };

signalWatchers[type] = w;

w.start();

} else if (this.listeners(type).length === 1) {

signalWatchers[type].start();

}

return ret;

};

process.removeListener = function(type, listener) {

var ret = removeListener.apply(this, arguments);

if (isSignal(type)) {

assert(signalWatchers.hasOwnProperty(type));

if (this.listeners(type).length === 0) {

signalWatchers[type].stop();

}

return ret;

};

startup.processChannel = function() {

// If we were spawned with env NODE_CHANNEL_FD then load that up and

// start parsing data from that stream.

if (process.env.NODE_CHANNEL_FD) {

assert(parseInt(process.env.NODE_CHANNEL_FD) >= 0);

var cp = NativeModule.require('child_process');

// Load tcp_wrap to avoid situation where we might immediately receive

// a message.

// FIXME is this really necessary?

process.binding('tcp_wrap');

cp._forkChild();

assert(process.send);

}

startup.resolveArgv0 = function() {

var cwd = process.cwd();

// Make process.argv[0] into a full path, but only touch argv[0] if it's

// not a system $PATH lookup.

// TODO: Make this work on Windows as well. Note that "node" might

// execute cwd\node.exe, or some %PATH%\node.exe on Windows,

// and that every directory has its own cwd, so d:node.exe is valid.

var path = NativeModule.require('path');

process.argv[0] = path.resolve(process.argv[0]);

};

// Below you find a minimal module system, which is used to load the node

// core modules found in lib/*.js. All core modules are compiled into the

// node binary, so they can be loaded faster.

var Script = process.binding('evals').NodeScript;

var runInThisContext = Script.runInThisContext;

function NativeModule(id) {

this.filename = id + '.js';

this.id = id;

this.exports = {};

this.loaded = false;

}

NativeModule._source = process.binding('natives');

NativeModule._cache = {};

NativeModule.require = function(id) {

if (id == 'native_module') {

return NativeModule;

}

var cached = NativeModule.getCached(id);

if (cached) {

return cached.exports;

}

if (!NativeModule.exists(id)) {

throw new Error('No such native module ' + id);

}

process.moduleLoadList.push('NativeModule ' + id);

var nativeModule = new NativeModule(id);

nativeModule.compile();

nativeModule.cache();

return nativeModule.exports;

};

NativeModule.getCached = function(id) {

return NativeModule._cache[id];

}

NativeModule.exists = function(id) {

return NativeModule._source.hasOwnProperty(id);

}

NativeModule.getSource = function(id) {

return NativeModule._source[id];

}

NativeModule.wrap = function(script) {

return NativeModule.wrapper[0] + script + NativeModule.wrapper[1];

};

NativeModule.wrapper = [

'(function (exports, require, module, __filename, __dirname) { ',

'\n});'

];

NativeModule.prototype.compile = function() {

var source = NativeModule.getSource(this.id);

source = NativeModule.wrap(source);

var fn = runInThisContext(source, this.filename, true);

fn(this.exports, NativeModule.require, this, this.filename);

this.loaded = true;

};

NativeModule.prototype.cache = function() {

NativeModule._cache[this.id] = this;

};

// Wrap a core module's method in a wrapper that will warn on first use

// and then return the result of invoking the original function. After

// first being called the original method is restored.

NativeModule.prototype.deprecate = function(method, message) {

var original = this.exports[method];

var self = this;

var warned = false;

message = message || '';

Object.defineProperty(this.exports, method, {

enumerable: false,

value: function() {

if (!warned) {

warned = true;

message = self.id + '.' + method + ' is deprecated. ' + message;

var moduleIdCheck = new RegExp('\\b' + self.id + '\\b');

if (moduleIdCheck.test(process.env.NODE_DEBUG))

console.trace(message);

else

console.error(message);

self.exports[method] = original;

}

return original.apply(this, arguments);

}

});

};

startup();

});

node/src/node.js at master · deepu105/node · GitHub

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