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