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/* -*- Mode: indent-tabs-mode: nil; js-indent-level: 2 -*- */
/* vim: set sts=2 sw=2 et tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
import {
BaseProcess,
PromiseWorker,
} from "resource://gre/modules/subprocess/subprocess_common.sys.mjs";
const { ctypes } = ChromeUtils.import("resource://gre/modules/ctypes.jsm");
var obj = { ctypes };
Services.scriptloader.loadSubScript(
"resource://gre/modules/subprocess/subprocess_shared.js",
obj
);
Services.scriptloader.loadSubScript(
"resource://gre/modules/subprocess/subprocess_shared_unix.js",
obj
);
const { SubprocessConstants, LIBC } = obj;
// libc is exported for tests.
export var libc = obj.libc;
class UnixPromiseWorker extends PromiseWorker {
constructor(...args) {
super(...args);
let fds = ctypes.int.array(2)();
let res = libc.pipe(fds);
if (res == -1) {
throw new Error("Unable to create pipe");
}
this.signalFd = fds[1];
libc.fcntl(fds[0], LIBC.F_SETFL, LIBC.O_NONBLOCK);
libc.fcntl(fds[0], LIBC.F_SETFD, LIBC.FD_CLOEXEC);
libc.fcntl(fds[1], LIBC.F_SETFD, LIBC.FD_CLOEXEC);
this.call("init", [{ signalFd: fds[0] }]);
}
closePipe() {
if (this.signalFd) {
libc.close(this.signalFd);
this.signalFd = null;
}
}
onClose() {
this.closePipe();
super.onClose();
}
signalWorker() {
libc.write(this.signalFd, new ArrayBuffer(1), 1);
}
postMessage(...args) {
this.signalWorker();
return super.postMessage(...args);
}
}
class Process extends BaseProcess {
static get WORKER_URL() {
return "resource://gre/modules/subprocess/subprocess_worker_unix.js";
}
static get WorkerClass() {
return UnixPromiseWorker;
}
}
// Convert a null-terminated char pointer into a sized char array, and then
// convert that into a JS typed array.
// The resulting array will not be null-terminated.
function ptrToUint8Array(input) {
let { cast, uint8_t } = ctypes;
let len = 0;
for (
let ptr = cast(input, uint8_t.ptr);
ptr.contents;
ptr = ptr.increment()
) {
len++;
}
let aryPtr = cast(input, uint8_t.array(len).ptr);
return new Uint8Array(aryPtr.contents);
}
var SubprocessUnix = {
Process,
call(options) {
return Process.create(options);
},
*getEnvironment() {
let environ;
if (Services.appinfo.OS === "Darwin") {
environ = libc._NSGetEnviron().contents;
} else {
environ = libc.environ;
}
const EQUAL = "=".charCodeAt(0);
let decoder = new TextDecoder("utf-8", { fatal: true });
function decode(array) {
try {
return decoder.decode(array);
} catch (e) {
return array;
}
}
for (
let envp = environ;
!envp.isNull() && !envp.contents.isNull();
envp = envp.increment()
) {
let buf = ptrToUint8Array(envp.contents);
for (let i = 0; i < buf.length; i++) {
if (buf[i] == EQUAL) {
yield [decode(buf.subarray(0, i)), decode(buf.subarray(i + 1))];
break;
}
}
}
},
isExecutableFile: async function isExecutable(path) {
if (!PathUtils.isAbsolute(path)) {
return false;
}
try {
let info = await IOUtils.stat(path);
// FIXME: We really want access(path, X_OK) here, but IOUtils does not
// support it.
return info.type !== "directory" && info.permissions & 0o111;
} catch (e) {
return false;
}
},
/**
* Searches for the given executable file in the system executable
* file paths as specified by the PATH environment variable.
*
* On Windows, if the unadorned filename cannot be found, the
* extensions in the semicolon-separated list in the PATHEXT
* environment variable are successively appended to the original
* name and searched for in turn.
*
* @param {string} bin
* The name of the executable to find.
* @param {object} environment
* An object containing a key for each environment variable to be used
* in the search.
* @returns {Promise<string>}
*/
async pathSearch(bin, environment) {
if (PathUtils.isAbsolute(bin)) {
if (await this.isExecutableFile(bin)) {
return bin;
}
let error = new Error(
`File at path "${bin}" does not exist, or is not executable`
);
error.errorCode = SubprocessConstants.ERROR_BAD_EXECUTABLE;
throw error;
}
let dirs = [];
if (typeof environment.PATH === "string") {
dirs = environment.PATH.split(":");
}
for (let dir of dirs) {
let path = PathUtils.join(dir, bin);
if (await this.isExecutableFile(path)) {
return path;
}
}
let error = new Error(`Executable not found: ${bin}`);
error.errorCode = SubprocessConstants.ERROR_BAD_EXECUTABLE;
throw error;
},
};
export var SubprocessImpl = SubprocessUnix;
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