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subprocess_worker_unix.js
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278 lines (234 loc) · 8.84 KB
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/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public
* License Version 1.1 (the "MPL"); you may not use this file
* except in compliance with the MPL. You may obtain a copy of
* the MPL at http://www.mozilla.org/MPL/
*
* Software distributed under the MPL is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the MPL for the specific language governing
* rights and limitations under the MPL.
*
* The Original Code is subprocess.jsm.
*
* The Initial Developer of this code is Patrick Brunschwig.
* Portions created by Patrick Brunschwig <[email protected]>
* are Copyright (C) 2011 Patrick Brunschwig.
* All Rights Reserved.
*
* Contributor(s):
* Jan Gerber <[email protected]>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
* ***** END LICENSE BLOCK ***** */
/*
* ChromeWorker Object subprocess.jsm on Unix-like systems (Linux, Mac OS X, ...)
* to process stdin/stdout/stderr on separate threads.
*
*/
// Being a ChromeWorker object, implicitly uses the following:
// Cu.import("resource://gre/modules/ctypes.jsm");
'use strict';
const BufferSize = 1024;
var libc = null;
var libcFunc = {};
/*
struct pollfd {
int fd; // file descriptor
short events; // events to look for
short revents; // events returned
};
*/
var pollfd = new ctypes.StructType("pollfd",
[ {'fd': ctypes.int},
{'events': ctypes.short},
{'revents': ctypes.short}
]);
var WriteBuffer = ctypes.uint8_t.array(BufferSize);
var ReadBuffer = ctypes.char.array(BufferSize);
const POLLIN = 0x0001;
const POLLOUT = 0x0004;
const POLLERR = 0x0008; // some poll error occurred
const POLLHUP = 0x0010; // file descriptor was "hung up"
const POLLNVAL = 0x0020; // requested events "invalid"
const WNOHANG = 0x01;
const pid_t = ctypes.int32_t;
const INDEFINITE = -1;
const NOWAIT = 0;
const WAITTIME = 200 // wait time for poll() in ms
function initLibc(libName) {
postMessage({msg: "debug", data: "initialising library with "+ libName});
libc = ctypes.open(libName);
libcFunc.pollFds = pollfd.array(1);
// int poll(struct pollfd fds[], nfds_t nfds, int timeout);
libcFunc.poll = libc.declare("poll",
ctypes.default_abi,
ctypes.int,
libcFunc.pollFds,
ctypes.unsigned_int,
ctypes.int);
//ssize_t write(int fd, const void *buf, size_t count);
// NOTE: buf is declared as array of unsigned int8 instead of char to avoid
// implicit charset conversion
libcFunc.write = libc.declare("write",
ctypes.default_abi,
ctypes.int,
ctypes.int,
WriteBuffer,
ctypes.int);
//int read(int fd, void *buf, size_t count);
libcFunc.read = libc.declare("read",
ctypes.default_abi,
ctypes.int,
ctypes.int,
ReadBuffer,
ctypes.int);
//int pipe(int pipefd[2]);
libcFunc.pipefd = ctypes.int.array(2);
//int close(int fd);
libcFunc.close = libc.declare("close",
ctypes.default_abi,
ctypes.int,
ctypes.int);
//pid_t waitpid(pid_t pid, int *status, int options);
libcFunc.waitpid = libc.declare("waitpid",
ctypes.default_abi,
pid_t,
pid_t,
ctypes.int.ptr,
ctypes.int);
}
function closePipe(pipe) {
libcFunc.close(pipe);
}
function writePipe(pipe, data) {
postMessage({msg: "debug", data: "trying to write to "+pipe});
let numChunks = Math.floor(data.length / BufferSize);
let pData = new WriteBuffer();
for (var chunk = 0; chunk <= numChunks; chunk ++) {
let numBytes = chunk < numChunks ? BufferSize : data.length - chunk * BufferSize;
for (var i=0; i < numBytes; i++) {
pData[i] = data.charCodeAt(chunk * BufferSize + i) % 256;
}
let bytesWritten = libcFunc.write(pipe, pData, numBytes);
if (bytesWritten != numBytes) {
closePipe(pipe);
postMessage({ msg: "error", data: "error: wrote "+bytesWritten+" instead of "+numBytes+" bytes"});
close();
}
}
postMessage({msg: "info", data: "wrote "+data.length+" bytes of data"});
}
function readString(data, length, charset) {
var string = '', bytes = [];
for(var i = 0;i < length; i++) {
if(data[i] == 0 && charset != "null") // stop on NULL character for non-binary data
break;
bytes.push(data[i]);
}
return bytes;
}
function readPipe(pipe, charset, pid) {
var p = new libcFunc.pollFds;
p[0].fd = pipe;
p[0].events = POLLIN | POLLERR | POLLHUP;
p[0].revents = 0;
var pollTimeout = WAITTIME;
var exitCode = -1;
var readCount = 0;
var result, status = ctypes.int();
result = 0;
const i=0;
while (true) {
if (result == 0) {
result = libcFunc.waitpid(pid, status.address(), WNOHANG);
if (result > 0) {
pollTimeout = NOWAIT;
exitCode = parseInt(status.value);
postMessage({msg: "debug", data: "waitpid signaled subprocess stop, exitcode="+status.value });
}
}
var r = libcFunc.poll(p, 1, pollTimeout);
if (r > 0) {
if (p[i].revents & POLLIN) {
postMessage({msg: "debug", data: "reading next chunk"});
readCount = readPolledFd(p[i].fd, charset);
if (readCount == 0) break;
}
if (p[i].revents & POLLHUP) {
postMessage({msg: "debug", data: "poll returned HUP"});
break;
}
else if (p[i].revents & POLLERR) {
postMessage({msg: "error", data: "poll returned error"});
break;
}
else if (p[i].revents != POLLIN) {
postMessage({msg: "error", data: "poll returned "+p[i]});
break;
}
}
else
if (pollTimeout == 0 || r < 0) break;
}
// continue reading until the buffer is empty
while (readCount > 0) {
readCount = readPolledFd(pipe, charset);
}
libcFunc.close(pipe);
postMessage({msg: "done", data: exitCode });
libc.close();
close();
}
function readPolledFd(pipe, charset) {
var line = new ReadBuffer();
var r = libcFunc.read(pipe, line, BufferSize);
if (r > 0) {
var c = readString(line, r, charset);
postMessage({msg: "data", data: c, count: c.length});
}
return r;
}
onmessage = function (event) {
switch (event.data.msg) {
case "init":
initLibc(event.data.libc);
break;
case "read":
initLibc(event.data.libc);
readPipe(event.data.pipe, event.data.charset, event.data.pid);
break;
case "write":
// data contents:
// msg: 'write'
// data: the data (string) to write
// pipe: ptr to pipe
writePipe(event.data.pipe, event.data.data);
postMessage({msg: "info", data: "WriteOK"});
break;
case "close":
postMessage({msg: "debug", data: "closing stdin\n"});
closePipe(event.data.pipe);
postMessage({msg: "info", data: "ClosedOK"});
break;
case "stop":
libc.close(); // do not use libc after this point
close();
break;
default:
throw("error: Unknown command"+event.data.msg+"\n");
}
return;
};