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net: Handle sync writable streams synchronously
This fixes the case where stderr doesn't flush before the process exits.
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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. | ||
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// Make sure that sync writes to stderr get processed before exiting. | ||
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var common = require('../common.js'); | ||
var assert = require('assert'); | ||
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function parent() { | ||
var spawn = require('child_process').spawn; | ||
var assert = require('assert'); | ||
var i = 0; | ||
children.forEach(function(_, c) { | ||
var child = spawn(process.execPath, [__filename, '' + c]); | ||
var err = ''; | ||
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child.stderr.on('data', function(c) { | ||
err += c; | ||
}); | ||
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child.on('close', function() { | ||
assert.equal(err, 'child ' + c + '\nfoo\nbar\nbaz\n'); | ||
console.log('ok %d child #%d', ++i, c); | ||
if (i === children.length) | ||
console.log('1..' + i); | ||
}); | ||
}); | ||
} | ||
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function child0() { | ||
// Just a very simple wrapper around TTY(2) | ||
// Essentially the same as stderr, but without all the net stuff. | ||
var Writable = require('stream').Writable; | ||
var util = require('util'); | ||
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// a lowlevel stderr writer | ||
var TTY = process.binding('tty_wrap').TTY; | ||
var handle = new TTY(2, false); | ||
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util.inherits(W, Writable); | ||
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function W(opts) { | ||
Writable.call(this, opts); | ||
} | ||
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W.prototype._write = function(chunk, cb) { | ||
var req = handle.writeUtf8String(chunk.toString() + '\n'); | ||
// here's the problem. | ||
// it needs to tell the Writable machinery that it's ok to write | ||
// more, but that the current buffer length is handle.writeQueueSize | ||
req.oncomplete = afterWrite | ||
if (req.writeQueueSize === 0) | ||
req.cb = cb; | ||
else | ||
cb(); | ||
} | ||
function afterWrite(status, handle, req) { | ||
if (req.cb) | ||
req.cb(); | ||
} | ||
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var w = new W | ||
w.write('child 0'); | ||
w.write('foo'); | ||
w.write('bar'); | ||
w.write('baz'); | ||
} | ||
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// using console.error | ||
function child1() { | ||
console.error('child 1'); | ||
console.error('foo'); | ||
console.error('bar'); | ||
console.error('baz'); | ||
} | ||
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// using process.stderr | ||
function child2() { | ||
process.stderr.write('child 2\n'); | ||
process.stderr.write('foo\n'); | ||
process.stderr.write('bar\n'); | ||
process.stderr.write('baz\n'); | ||
} | ||
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// using a net socket | ||
function child3() { | ||
var net = require('net'); | ||
var socket = new net.Socket({ fd: 2 }); | ||
socket.write('child 3\n'); | ||
socket.write('foo\n'); | ||
socket.write('bar\n'); | ||
socket.write('baz\n'); | ||
} | ||
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function child4() { | ||
console.error('child 4\nfoo\nbar\nbaz'); | ||
} | ||
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function child5() { | ||
process.stderr.write('child 5\nfoo\nbar\nbaz\n'); | ||
} | ||
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var children = [ child0, child1, child2, child3, child4, child5 ]; | ||
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if (!process.argv[2]) { | ||
parent(); | ||
} else { | ||
children[process.argv[2]](); | ||
// immediate process.exit to kill any waiting stuff. | ||
process.exit(); | ||
} |