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emrun_postjs.js
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/**
* @license
* Copyright 2013 The Emscripten Authors
* SPDX-License-Identifier: MIT
*/
if (typeof window === "object" && (typeof ENVIRONMENT_IS_PTHREAD === 'undefined' || !ENVIRONMENT_IS_PTHREAD)) {
var emrun_register_handlers = function() {
// When C code exit()s, we may still have remaining stdout and stderr messages in flight. In that case, we can't close
// the browser until all those XHRs have finished, so the following state variables track that all communication is done,
// after which we can close.
var emrun_num_post_messages_in_flight = 0;
var emrun_should_close_itself = false;
var postExit = function(msg) {
var http = new XMLHttpRequest();
// Don't do this immediately, this may race with the notification about the return code reaching the
// server. Send a *sync* xhr so that we know for sure that the server has gotten the return code
// before we continue.
http.open("POST", "stdio.html", false);
http.send(msg);
try {
// Try closing the current browser window, since it exit()ed itself. This can shut down the browser process
// and then emrun does not need to kill the whole browser process.
window.close();
} catch(e) {}
};
var post = function(msg) {
var http = new XMLHttpRequest();
++emrun_num_post_messages_in_flight;
http.onreadystatechange = function() {
if (http.readyState == 4 /*DONE*/) {
if (--emrun_num_post_messages_in_flight == 0 && emrun_should_close_itself) postExit('^exit^'+EXITSTATUS);
}
}
http.open("POST", "stdio.html", true);
http.send(msg);
};
// If the address contains localhost, or we are running the page from port 6931, we can assume we're running the test runner and should post stdout logs.
if (document.URL.search("localhost") != -1 || document.URL.search(":6931/") != -1) {
var emrun_http_sequence_number = 1;
var prevPrint = out;
var prevErr = err;
Module['addOnExit'](function() { if (emrun_num_post_messages_in_flight == 0) postExit('^exit^'+EXITSTATUS); else emrun_should_close_itself = true; });
out = function(text) { post('^out^'+(emrun_http_sequence_number++)+'^'+encodeURIComponent(text)); prevPrint(text); };
err = function(text) { post('^err^'+(emrun_http_sequence_number++)+'^'+encodeURIComponent(text)); prevErr(text); };
// Notify emrun web server that this browser has successfully launched the page. Note that we may need to
// wait for the server to be ready.
var tryToSendPageload = function() {
try {
post('^pageload^');
} catch (e) {
setTimeout(tryToSendPageload, 50);
}
};
tryToSendPageload();
}
};
// POSTs the given binary data represented as a (typed) array data back to the emrun-based web server.
// To use from C code, call e.g. EM_ASM({emrun_file_dump("file.dat", HEAPU8.subarray($0, $0 + $1));}, my_data_pointer, my_data_pointer_byte_length);
var emrun_file_dump = function(filename, data) {
var http = new XMLHttpRequest();
out('Dumping out file "' + filename + '" with ' + data.length + ' bytes of data.');
http.open("POST", "stdio.html?file=" + filename, true);
http.send(data); // XXX this does not work in workers, for some odd reason (issue #2681)
};
if (typeof Module !== 'undefined' && typeof document !== 'undefined') emrun_register_handlers();
}