Current File : //proc/self/root/usr/src/node-v0.10.4/src/node.js
// 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) {
this.global = this;
function startup() {
var EventEmitter = NativeModule.require('events').EventEmitter;
process.__proto__ = Object.create(EventEmitter.prototype, {
constructor: {
value: process.constructor
}
});
EventEmitter.call(process);
process.EventEmitter = EventEmitter; // process.EventEmitter is deprecated
// do this good and early, since it handles errors.
startup.processFatal();
startup.globalVariables();
startup.globalTimeouts();
startup.globalConsole();
startup.processAssert();
startup.processConfig();
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.
evalScript('[eval]');
} 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();
// Make sure it's not accidentally inherited by child processes.
delete process.env.NODE_UNIQUE_ID;
}
var Module = NativeModule.require('module');
if (global.v8debug &&
process.execArgv.some(function(arg) {
return arg.match(/^--debug-brk(=[0-9]*)?$/);
})) {
// XXX Fix this terrible hack!
//
// Give the client program a few ticks to connect.
// Otherwise, there's a race condition where `node debug foo.js`
// will not be able to connect in time to catch the first
// breakpoint message on line 1.
//
// A better fix would be to somehow get a message from the
// global.v8debug object about a connection, and runMain when
// that occurs. --isaacs
var debugTimeout = +process.env.NODE_DEBUG_TIMEOUT || 50;
setTimeout(Module.runMain, debugTimeout);
} else {
// Main entry point into most programs:
Module.runMain();
}
} else {
var Module = NativeModule.require('module');
// If -i or --interactive were passed, or stdin is a TTY.
if (process._forceRepl || NativeModule.require('tty').isatty(0)) {
// REPL
var opts = {
useGlobal: true,
ignoreUndefined: false
};
if (parseInt(process.env['NODE_NO_READLINE'], 10)) {
opts.terminal = false;
}
if (parseInt(process.env['NODE_DISABLE_COLORS'], 10)) {
opts.useColors = false;
}
var repl = Module.requireRepl().start(opts);
repl.on('exit', function() {
process.exit();
});
} else {
// Read all of stdin - execute it.
process.stdin.setEncoding('utf8');
var code = '';
process.stdin.on('data', function(d) {
code += d;
});
process.stdin.on('end', function() {
process._eval = code;
evalScript('[stdin]');
});
}
}
}
startup.globalVariables = function() {
global.process = process;
global.global = global;
global.GLOBAL = global;
global.root = global;
global.Buffer = NativeModule.require('buffer').Buffer;
process.binding('buffer').setFastBufferConstructor(global.Buffer);
process.domain = null;
process._exiting = false;
};
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);
};
global.setImmediate = function() {
var t = NativeModule.require('timers');
return t.setImmediate.apply(this, arguments);
};
global.clearImmediate = function() {
var t = NativeModule.require('timers');
return t.clearImmediate.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;
};
startup.processFatal = function() {
// call into the active domain, or emit uncaughtException,
// and exit if there are no listeners.
process._fatalException = function(er) {
var caught = false;
if (process.domain) {
var domain = process.domain;
var domainModule = NativeModule.require('domain');
var domainStack = domainModule._stack;
// ignore errors on disposed domains.
//
// XXX This is a bit stupid. We should probably get rid of
// domain.dispose() altogether. It's almost always a terrible
// idea. --isaacs
if (domain._disposed)
return true;
er.domain = domain;
er.domainThrown = true;
// wrap this in a try/catch so we don't get infinite throwing
try {
// One of three things will happen here.
//
// 1. There is a handler, caught = true
// 2. There is no handler, caught = false
// 3. It throws, caught = false
//
// If caught is false after this, then there's no need to exit()
// the domain, because we're going to crash the process anyway.
caught = domain.emit('error', er);
// Exit all domains on the stack. Uncaught exceptions end the
// current tick and no domains should be left on the stack
// between ticks.
var domainModule = NativeModule.require('domain');
domainStack.length = 0;
domainModule.active = process.domain = null;
} catch (er2) {
// The domain error handler threw! oh no!
// See if another domain can catch THIS error,
// or else crash on the original one.
// If the user already exited it, then don't double-exit.
if (domain === domainModule.active)
domainStack.pop();
if (domainStack.length) {
var parentDomain = domainStack[domainStack.length - 1];
process.domain = domainModule.active = parentDomain;
caught = process._fatalException(er2);
} else
caught = false;
}
} else {
caught = process.emit('uncaughtException', er);
}
// if someone handled it, then great. otherwise, die in C++ land
// since that means that we'll exit the process, emit the 'exit' event
if (!caught) {
try {
if (!process._exiting) {
process._exiting = true;
process.emit('exit', 1);
}
} catch (er) {
// nothing to be done about it at this point.
}
}
// if we handled an error, then make sure any ticks get processed
if (caught)
process._needTickCallback();
return caught;
};
};
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.processConfig = function() {
// used for `process.config`, but not a real module
var config = NativeModule._source.config;
delete NativeModule._source.config;
// strip the gyp comment line at the beginning
config = config.split('\n').slice(1).join('\n').replace(/'/g, '"');
process.config = JSON.parse(config, function(key, value) {
if (value === 'true') return true;
if (value === 'false') return false;
return value;
});
};
startup.processNextTick = function() {
var _needTickCallback = process._needTickCallback;
var nextTickQueue = [];
var needSpinner = true;
var inTick = false;
// this infobox thing is used so that the C++ code in src/node.cc
// can have easy accesss to our nextTick state, and avoid unnecessary
// calls into process._tickCallback.
// order is [length, index, depth]
// Never write code like this without very good reason!
var infoBox = process._tickInfoBox;
var length = 0;
var index = 1;
var depth = 2;
process.nextTick = nextTick;
// needs to be accessible from cc land
process._nextDomainTick = _nextDomainTick;
process._tickCallback = _tickCallback;
process._tickDomainCallback = _tickDomainCallback;
process._tickFromSpinner = _tickFromSpinner;
// the maximum number of times it'll process something like
// nextTick(function f(){nextTick(f)})
// It's unlikely, but not illegal, to hit this limit. When
// that happens, it yields to libuv's tick spinner.
// This is a loop counter, not a stack depth, so we aren't using
// up lots of memory here. I/O can sneak in before nextTick if this
// limit is hit, which is not ideal, but not terrible.
process.maxTickDepth = 1000;
function tickDone(tickDepth_) {
if (infoBox[length] !== 0) {
if (infoBox[length] <= infoBox[index]) {
nextTickQueue = [];
infoBox[length] = 0;
} else {
nextTickQueue.splice(0, infoBox[index]);
infoBox[length] = nextTickQueue.length;
if (needSpinner) {
_needTickCallback();
needSpinner = false;
}
}
}
inTick = false;
infoBox[index] = 0;
infoBox[depth] = tickDepth_;
}
function maxTickWarn() {
// XXX Remove all this maxTickDepth stuff in 0.11
var msg = '(node) warning: Recursive process.nextTick detected. ' +
'This will break in the next version of node. ' +
'Please use setImmediate for recursive deferral.';
if (process.throwDeprecation)
throw new Error(msg);
else if (process.traceDeprecation)
console.trace(msg);
else
console.error(msg);
}
function _tickFromSpinner() {
needSpinner = true;
// coming from spinner, reset!
if (infoBox[depth] !== 0)
infoBox[depth] = 0;
// no callbacks to run
if (infoBox[length] === 0)
return infoBox[index] = infoBox[depth] = 0;
process._tickCallback();
}
// run callbacks that have no domain
// using domains will cause this to be overridden
function _tickCallback() {
var callback, nextTickLength, threw;
if (inTick) return;
if (infoBox[length] === 0) {
infoBox[index] = 0;
infoBox[depth] = 0;
return;
}
inTick = true;
while (infoBox[depth]++ < process.maxTickDepth) {
nextTickLength = infoBox[length];
if (infoBox[index] === nextTickLength)
return tickDone(0);
while (infoBox[index] < nextTickLength) {
callback = nextTickQueue[infoBox[index]++].callback;
threw = true;
try {
callback();
threw = false;
} finally {
if (threw) tickDone(infoBox[depth]);
}
}
}
tickDone(0);
}
function _tickDomainCallback() {
var nextTickLength, tock, callback, threw;
// if you add a nextTick in a domain's error handler, then
// it's possible to cycle indefinitely. Normally, the tickDone
// in the finally{} block below will prevent this, however if
// that error handler ALSO triggers multiple MakeCallbacks, then
// it'll try to keep clearing the queue, since the finally block
// fires *before* the error hits the top level and is handled.
if (infoBox[depth] >= process.maxTickDepth)
return _needTickCallback();
if (inTick) return;
inTick = true;
// always do this at least once. otherwise if process.maxTickDepth
// is set to some negative value, or if there were repeated errors
// preventing depth from being cleared, we'd never process any
// of them.
while (infoBox[depth]++ < process.maxTickDepth) {
nextTickLength = infoBox[length];
if (infoBox[index] === nextTickLength)
return tickDone(0);
while (infoBox[index] < nextTickLength) {
tock = nextTickQueue[infoBox[index]++];
callback = tock.callback;
if (tock.domain) {
if (tock.domain._disposed) continue;
tock.domain.enter();
}
threw = true;
try {
callback();
threw = false;
} finally {
// finally blocks fire before the error hits the top level,
// so we can't clear the depth at this point.
if (threw) tickDone(infoBox[depth]);
}
if (tock.domain) {
tock.domain.exit();
}
}
}
tickDone(0);
}
function nextTick(callback) {
// on the way out, don't bother. it won't get fired anyway.
if (process._exiting)
return;
if (infoBox[depth] >= process.maxTickDepth)
maxTickWarn();
var obj = { callback: callback, domain: null };
nextTickQueue.push(obj);
infoBox[length]++;
if (needSpinner) {
_needTickCallback();
needSpinner = false;
}
}
function _nextDomainTick(callback) {
// on the way out, don't bother. it won't get fired anyway.
if (process._exiting)
return;
if (infoBox[depth] >= process.maxTickDepth)
maxTickWarn();
var obj = { callback: callback, domain: process.domain };
nextTickQueue.push(obj);
infoBox[length]++;
if (needSpinner) {
_needTickCallback();
needSpinner = false;
}
}
};
function evalScript(name) {
var Module = NativeModule.require('module');
var path = NativeModule.require('path');
var cwd = process.cwd();
var module = new Module(name);
module.filename = path.join(cwd, name);
module.paths = Module._nodeModulePaths(cwd);
var script = process._eval;
if (!Module._contextLoad) {
var body = script;
script = 'global.__filename = ' + JSON.stringify(name) + ';\n' +
'global.exports = exports;\n' +
'global.module = module;\n' +
'global.__dirname = __dirname;\n' +
'global.require = require;\n' +
'return require("vm").runInThisContext(' +
JSON.stringify(body) + ', ' +
JSON.stringify(name) + ', true);\n';
}
var result = module._compile(script, name + '-wrapper');
if (process._print_eval) console.log(result);
}
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':
case 'TCP':
var net = NativeModule.require('net');
stream = new net.Socket({
fd: fd,
readable: false,
writable: true
});
// FIXME Should probably have an option in net.Socket 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.read = null;
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);
};
if (stdout.isTTY) {
process.on('SIGWINCH', function() {
stdout._refreshSize();
});
}
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, {
highWaterMark: 0,
readable: true,
writable: false
});
break;
case 'FILE':
var fs = NativeModule.require('fs');
stdin = new fs.ReadStream(null, { fd: fd });
break;
case 'PIPE':
case 'TCP':
var net = NativeModule.require('net');
stdin = new net.Socket({
fd: fd,
readable: true,
writable: false
});
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. 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
// immediately, so that the process can close down.
stdin.on('pause', function() {
if (!stdin._handle)
return;
stdin._readableState.reading = false;
stdin._handle.reading = false;
stdin._handle.readStop();
});
return stdin;
});
process.openStdin = function() {
process.stdin.resume();
return process.stdin;
};
};
startup.processKillAndExit = function() {
process.exit = function(code) {
if (!process._exiting) {
process._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(process._errno, 'kill');
}
return true;
};
};
startup.processSignalHandlers = function() {
// Load events module in order to access prototype elements on process like
// process.addListener.
var signalWraps = {};
var addListener = process.addListener;
var removeListener = process.removeListener;
function isSignal(event) {
return event.slice(0, 3) === 'SIG' &&
startup.lazyConstants().hasOwnProperty(event);
}
// Wrap addListener for the special signal types
process.on = process.addListener = function(type, listener) {
if (isSignal(type) &&
!signalWraps.hasOwnProperty(type)) {
var Signal = process.binding('signal_wrap').Signal;
var wrap = new Signal();
wrap.unref();
wrap.onsignal = function() { process.emit(type); };
var signum = startup.lazyConstants()[type];
var r = wrap.start(signum);
if (r) {
wrap.close();
throw errnoException(process._errno, 'uv_signal_start');
}
signalWraps[type] = wrap;
}
return addListener.apply(this, arguments);
};
process.removeListener = function(type, listener) {
var ret = removeListener.apply(this, arguments);
if (isSignal(type)) {
assert(signalWraps.hasOwnProperty(type));
if (this.listeners(type).length === 0) {
signalWraps[type].close();
delete signalWraps[type];
}
}
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) {
var fd = parseInt(process.env.NODE_CHANNEL_FD, 10);
assert(fd >= 0);
// Make sure it's not accidentally inherited by child processes.
delete process.env.NODE_CHANNEL_FD;
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(fd);
assert(process.send);
}
}
startup.resolveArgv0 = function() {
var cwd = process.cwd();
var isWindows = process.platform === 'win32';
// 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 argv0 = process.argv[0];
if (!isWindows && argv0.indexOf('/') !== -1 && argv0.charAt(0) !== '/') {
var path = NativeModule.require('path');
process.argv[0] = path.join(cwd, 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.cache();
nativeModule.compile();
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;
};
startup();
});
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