5e825d1073
This commit adds the ability to enable userspace tracing with lttng in io.js. It adds tracepoints for all the equivalent dtrace and ETW tracepoints. To use these tracepoints enable --with-lttng on linux. PR-URL: https://github.com/iojs/io.js/pull/702 Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl> Reviewed-By: Ryan Graham <ryan@strongloop.com> Reviewed-By: Stephen Belanger <admin@stephenbelanger.com>
71 lines
1.8 KiB
JavaScript
71 lines
1.8 KiB
JavaScript
var common = require('../common');
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var assert = require('assert');
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if (process.argv[2] === 'child')
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child();
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else
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parent();
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function parent() {
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test('foo,tud,bar', true);
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test('foo,tud', true);
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test('tud,bar', true);
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test('tud', true);
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test('foo,bar', false);
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test('', false);
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}
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function test(environ, shouldWrite) {
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var expectErr = '';
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if (shouldWrite) {
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expectErr = 'TUD %PID%: this { is: \'a\' } /debugging/\n' +
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'TUD %PID%: number=1234 string=asdf obj={"foo":"bar"}\n';
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}
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var expectOut = 'ok\n';
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var didTest = false;
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var spawn = require('child_process').spawn;
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var child = spawn(process.execPath, [__filename, 'child'], {
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// Lttng requires the HOME env variable or it prints to stderr,
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// This is not really ideal, as it breaks this test, so the HOME
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// env variable is passed to the child to make the test pass.
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// this is fixed in the next version of lttng (2.7+), so we can
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// remove it at sometime in the future.
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env: { NODE_DEBUG: environ, HOME: process.env.HOME }
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});
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expectErr = expectErr.split('%PID%').join(child.pid);
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var err = '';
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child.stderr.setEncoding('utf8');
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child.stderr.on('data', function(c) {
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err += c;
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});
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var out = '';
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child.stdout.setEncoding('utf8');
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child.stdout.on('data', function(c) {
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out += c;
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});
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child.on('close', function(c) {
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assert(!c);
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assert.equal(err, expectErr);
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assert.equal(out, expectOut);
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didTest = true;
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console.log('ok %j %j', environ, shouldWrite);
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});
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process.on('exit', function() {
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assert(didTest);
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});
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}
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function child() {
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var util = require('util');
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var debug = util.debuglog('tud');
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debug('this', { is: 'a' }, /debugging/);
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debug('number=%d string=%s obj=%j', 1234, 'asdf', { foo: 'bar' });
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console.log('ok');
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}
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