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nodejs/test/pummel/test-dtrace-jsstack.js
Gibson Fahnestock 7a0e462f9f test: use eslint to fix var->const/let
Manually fix issues that eslint --fix couldn't do automatically.

PR-URL: https://github.com/nodejs/node/pull/10685
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Roman Reiss <me@silverwind.io>
2017-01-11 11:43:52 +00:00

83 lines
1.9 KiB
JavaScript

'use strict';
const common = require('../common');
const assert = require('assert');
const os = require('os');
if (!common.isSunOS) {
common.skip('no DTRACE support');
return;
}
/*
* Some functions to create a recognizable stack.
*/
const frames = [ 'stalloogle', 'bagnoogle', 'doogle' ];
const stalloogle = function(str) {
global.expected = str;
os.loadavg();
};
const bagnoogle = function(arg0, arg1) {
stalloogle(arg0 + ' is ' + arg1 + ' except that it is read-only');
};
let done = false;
const doogle = function() {
if (!done)
setTimeout(doogle, 10);
bagnoogle('The bfs command', '(almost) like ed(1)');
};
const spawn = require('child_process').spawn;
/*
* We're going to use DTrace to stop us, gcore us, and set us running again
* when we call getloadavg() -- with the implicit assumption that our
* deepest function is the only caller of os.loadavg().
*/
const dtrace = spawn('dtrace', [ '-qwn', 'syscall::getloadavg:entry/pid == ' +
process.pid + '/{ustack(100, 8192); exit(0); }' ]);
let output = '';
dtrace.stderr.on('data', function(data) {
console.log('dtrace: ' + data);
});
dtrace.stdout.on('data', function(data) {
output += data;
});
dtrace.on('exit', function(code) {
if (code !== 0) {
console.error('dtrace exited with code ' + code);
process.exit(code);
}
done = true;
const sentinel = '(anon) as ';
const lines = output.split('\n');
for (let i = 0; i < lines.length; i++) {
const line = lines[i];
if (line.indexOf(sentinel) === -1 || frames.length === 0)
continue;
const frame = line.substr(line.indexOf(sentinel) + sentinel.length);
const top = frames.shift();
assert.equal(frame.indexOf(top), 0, 'unexpected frame where ' +
top + ' was expected');
}
assert.equal(frames.length, 0, 'did not find expected frame ' + frames[0]);
process.exit(0);
});
setTimeout(doogle, 10);