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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /toolkit/modules/subprocess/subprocess_worker_unix.js
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'toolkit/modules/subprocess/subprocess_worker_unix.js')
-rw-r--r--toolkit/modules/subprocess/subprocess_worker_unix.js609
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diff --git a/toolkit/modules/subprocess/subprocess_worker_unix.js b/toolkit/modules/subprocess/subprocess_worker_unix.js
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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/. */
+"use strict";
+
+/* exported Process */
+/* globals BaseProcess, BasePipe */
+
+importScripts("resource://gre/modules/subprocess/subprocess_shared.js",
+ "resource://gre/modules/subprocess/subprocess_shared_unix.js",
+ "resource://gre/modules/subprocess/subprocess_worker_common.js");
+
+const POLL_TIMEOUT = 5000;
+
+let io;
+
+let nextPipeId = 0;
+
+class Pipe extends BasePipe {
+ constructor(process, fd) {
+ super();
+
+ this.process = process;
+ this.fd = fd;
+ this.id = nextPipeId++;
+ }
+
+ get pollEvents() {
+ throw new Error("Not implemented");
+ }
+
+ /**
+ * Closes the file descriptor.
+ *
+ * @param {boolean} [force=false]
+ * If true, the file descriptor is closed immediately. If false, the
+ * file descriptor is closed after all current pending IO operations
+ * have completed.
+ *
+ * @returns {Promise<void>}
+ * Resolves when the file descriptor has been closed.
+ */
+ close(force = false) {
+ if (!force && this.pending.length) {
+ this.closing = true;
+ return this.closedPromise;
+ }
+
+ for (let {reject} of this.pending) {
+ let error = new Error("File closed");
+ error.errorCode = SubprocessConstants.ERROR_END_OF_FILE;
+ reject(error);
+ }
+ this.pending.length = 0;
+
+ if (!this.closed) {
+ this.fd.dispose();
+
+ this.closed = true;
+ this.resolveClosed();
+
+ io.pipes.delete(this.id);
+ io.updatePollFds();
+ }
+ return this.closedPromise;
+ }
+
+ /**
+ * Called when an error occurred while polling our file descriptor.
+ */
+ onError() {
+ this.close(true);
+ this.process.wait();
+ }
+}
+
+class InputPipe extends Pipe {
+ /**
+ * A bit mask of poll() events which we currently wish to be notified of on
+ * this file descriptor.
+ */
+ get pollEvents() {
+ if (this.pending.length) {
+ return LIBC.POLLIN;
+ }
+ return 0;
+ }
+
+ /**
+ * Asynchronously reads at most `length` bytes of binary data from the file
+ * descriptor into an ArrayBuffer of the same size. Returns a promise which
+ * resolves when the operation is complete.
+ *
+ * @param {integer} length
+ * The number of bytes to read.
+ *
+ * @returns {Promise<ArrayBuffer>}
+ */
+ read(length) {
+ if (this.closing || this.closed) {
+ throw new Error("Attempt to read from closed pipe");
+ }
+
+ return new Promise((resolve, reject) => {
+ this.pending.push({resolve, reject, length});
+ io.updatePollFds();
+ });
+ }
+
+ /**
+ * Synchronously reads at most `count` bytes of binary data into an
+ * ArrayBuffer, and returns that buffer. If no data can be read without
+ * blocking, returns null instead.
+ *
+ * @param {integer} count
+ * The number of bytes to read.
+ *
+ * @returns {ArrayBuffer|null}
+ */
+ readBuffer(count) {
+ let buffer = new ArrayBuffer(count);
+
+ let read = +libc.read(this.fd, buffer, buffer.byteLength);
+ if (read < 0 && ctypes.errno != LIBC.EAGAIN) {
+ this.onError();
+ }
+
+ if (read <= 0) {
+ return null;
+ }
+
+ if (read < buffer.byteLength) {
+ return ArrayBuffer.transfer(buffer, read);
+ }
+
+ return buffer;
+ }
+
+ /**
+ * Called when one of the IO operations matching the `pollEvents` mask may be
+ * performed without blocking.
+ *
+ * @returns {boolean}
+ * True if any data was successfully read.
+ */
+ onReady() {
+ let result = false;
+ let reads = this.pending;
+ while (reads.length) {
+ let {resolve, length} = reads[0];
+
+ let buffer = this.readBuffer(length);
+ if (buffer) {
+ result = true;
+ this.shiftPending();
+ resolve(buffer);
+ } else {
+ break;
+ }
+ }
+
+ if (reads.length == 0) {
+ io.updatePollFds();
+ }
+ return result;
+ }
+}
+
+class OutputPipe extends Pipe {
+ /**
+ * A bit mask of poll() events which we currently wish to be notified of on
+ * this file discriptor.
+ */
+ get pollEvents() {
+ if (this.pending.length) {
+ return LIBC.POLLOUT;
+ }
+ return 0;
+ }
+
+ /**
+ * Asynchronously writes the given buffer to our file descriptor, and returns
+ * a promise which resolves when the operation is complete.
+ *
+ * @param {ArrayBuffer} buffer
+ * The buffer to write.
+ *
+ * @returns {Promise<integer>}
+ * Resolves to the number of bytes written when the operation is
+ * complete.
+ */
+ write(buffer) {
+ if (this.closing || this.closed) {
+ throw new Error("Attempt to write to closed pipe");
+ }
+
+ return new Promise((resolve, reject) => {
+ this.pending.push({resolve, reject, buffer, length: buffer.byteLength});
+ io.updatePollFds();
+ });
+ }
+
+ /**
+ * Attempts to synchronously write the given buffer to our file descriptor.
+ * Writes only as many bytes as can be written without blocking, and returns
+ * the number of byes successfully written.
+ *
+ * Closes the file descriptor if an IO error occurs.
+ *
+ * @param {ArrayBuffer} buffer
+ * The buffer to write.
+ *
+ * @returns {integer}
+ * The number of bytes successfully written.
+ */
+ writeBuffer(buffer) {
+ let bytesWritten = libc.write(this.fd, buffer, buffer.byteLength);
+
+ if (bytesWritten < 0 && ctypes.errno != LIBC.EAGAIN) {
+ this.onError();
+ }
+
+ return bytesWritten;
+ }
+
+ /**
+ * Called when one of the IO operations matching the `pollEvents` mask may be
+ * performed without blocking.
+ */
+ onReady() {
+ let writes = this.pending;
+ while (writes.length) {
+ let {buffer, resolve, length} = writes[0];
+
+ let written = this.writeBuffer(buffer);
+
+ if (written == buffer.byteLength) {
+ resolve(length);
+ this.shiftPending();
+ } else if (written > 0) {
+ writes[0].buffer = buffer.slice(written);
+ } else {
+ break;
+ }
+ }
+
+ if (writes.length == 0) {
+ io.updatePollFds();
+ }
+ }
+}
+
+class Signal {
+ constructor(fd) {
+ this.fd = fd;
+ }
+
+ cleanup() {
+ libc.close(this.fd);
+ this.fd = null;
+ }
+
+ get pollEvents() {
+ return LIBC.POLLIN;
+ }
+
+ /**
+ * Called when an error occurred while polling our file descriptor.
+ */
+ onError() {
+ io.shutdown();
+ }
+
+ /**
+ * Called when one of the IO operations matching the `pollEvents` mask may be
+ * performed without blocking.
+ */
+ onReady() {
+ let buffer = new ArrayBuffer(16);
+ let count = +libc.read(this.fd, buffer, buffer.byteLength);
+ if (count > 0) {
+ io.messageCount += count;
+ }
+ }
+}
+
+class Process extends BaseProcess {
+ /**
+ * Each Process object opens an additional pipe from the target object, which
+ * will be automatically closed when the process exits, but otherwise
+ * carries no data.
+ *
+ * This property contains a bit mask of poll() events which we wish to be
+ * notified of on this descriptor. We're not expecting any input from this
+ * pipe, but we need to poll for input until the process exits in order to be
+ * notified when the pipe closes.
+ */
+ get pollEvents() {
+ if (this.exitCode === null) {
+ return LIBC.POLLIN;
+ }
+ return 0;
+ }
+
+ /**
+ * Kills the process with the given signal.
+ *
+ * @param {integer} signal
+ */
+ kill(signal) {
+ libc.kill(this.pid, signal);
+ this.wait();
+ }
+
+ /**
+ * Initializes the IO pipes for use as standard input, output, and error
+ * descriptors in the spawned process.
+ *
+ * @param {object} options
+ * The Subprocess options object for this process.
+ * @returns {unix.Fd[]}
+ * The array of file descriptors belonging to the spawned process.
+ */
+ initPipes(options) {
+ let stderr = options.stderr;
+
+ let our_pipes = [];
+ let their_pipes = new Map();
+
+ let pipe = input => {
+ let fds = ctypes.int.array(2)();
+
+ let res = libc.pipe(fds);
+ if (res == -1) {
+ throw new Error("Unable to create pipe");
+ }
+
+ fds = Array.from(fds, unix.Fd);
+
+ if (input) {
+ fds.reverse();
+ }
+
+ if (input) {
+ our_pipes.push(new InputPipe(this, fds[1]));
+ } else {
+ our_pipes.push(new OutputPipe(this, fds[1]));
+ }
+
+ libc.fcntl(fds[0], LIBC.F_SETFD, LIBC.FD_CLOEXEC);
+ libc.fcntl(fds[1], LIBC.F_SETFD, LIBC.FD_CLOEXEC);
+ libc.fcntl(fds[1], LIBC.F_SETFL, LIBC.O_NONBLOCK);
+
+ return fds[0];
+ };
+
+ their_pipes.set(0, pipe(false));
+ their_pipes.set(1, pipe(true));
+
+ if (stderr == "pipe") {
+ their_pipes.set(2, pipe(true));
+ } else if (stderr == "stdout") {
+ their_pipes.set(2, their_pipes.get(1));
+ }
+
+ // Create an additional pipe that we can use to monitor for process exit.
+ their_pipes.set(3, pipe(true));
+ this.fd = our_pipes.pop().fd;
+
+ this.pipes = our_pipes;
+
+ return their_pipes;
+ }
+
+ spawn(options) {
+ let {command, arguments: args} = options;
+
+ let argv = this.stringArray(args);
+ let envp = this.stringArray(options.environment);
+
+ let actions = unix.posix_spawn_file_actions_t();
+ let actionsp = actions.address();
+
+ let fds = this.initPipes(options);
+
+ let cwd;
+ try {
+ if (options.workdir) {
+ cwd = ctypes.char.array(LIBC.PATH_MAX)();
+ libc.getcwd(cwd, cwd.length);
+
+ if (libc.chdir(options.workdir) < 0) {
+ throw new Error(`Unable to change working directory to ${options.workdir}`);
+ }
+ }
+
+ libc.posix_spawn_file_actions_init(actionsp);
+ for (let [i, fd] of fds.entries()) {
+ libc.posix_spawn_file_actions_adddup2(actionsp, fd, i);
+ }
+
+ let pid = unix.pid_t();
+ let rv = libc.posix_spawn(pid.address(), command, actionsp, null, argv, envp);
+
+ if (rv != 0) {
+ for (let pipe of this.pipes) {
+ pipe.close();
+ }
+ throw new Error(`Failed to execute command "${command}"`);
+ }
+
+ this.pid = pid.value;
+ } finally {
+ libc.posix_spawn_file_actions_destroy(actionsp);
+
+ this.stringArrays.length = 0;
+
+ if (cwd) {
+ libc.chdir(cwd);
+ }
+ for (let fd of new Set(fds.values())) {
+ fd.dispose();
+ }
+ }
+ }
+
+ /**
+ * Called when input is available on our sentinel file descriptor.
+ *
+ * @see pollEvents
+ */
+ onReady() {
+ // We're not actually expecting any input on this pipe. If we get any, we
+ // can't poll the pipe any further without reading it.
+ if (this.wait() == undefined) {
+ this.kill(9);
+ }
+ }
+
+ /**
+ * Called when an error occurred while polling our sentinel file descriptor.
+ *
+ * @see pollEvents
+ */
+ onError() {
+ this.wait();
+ }
+
+ /**
+ * Attempts to wait for the process's exit status, without blocking. If
+ * successful, resolves the `exitPromise` to the process's exit value.
+ *
+ * @returns {integer|null}
+ * The process's exit status, if it has already exited.
+ */
+ wait() {
+ if (this.exitCode !== null) {
+ return this.exitCode;
+ }
+
+ let status = ctypes.int();
+
+ let res = libc.waitpid(this.pid, status.address(), LIBC.WNOHANG);
+ if (res == this.pid) {
+ let sig = unix.WTERMSIG(status.value);
+ if (sig) {
+ this.exitCode = -sig;
+ } else {
+ this.exitCode = unix.WEXITSTATUS(status.value);
+ }
+
+ this.fd.dispose();
+ io.updatePollFds();
+ this.resolveExit(this.exitCode);
+ return this.exitCode;
+ }
+ }
+}
+
+io = {
+ pollFds: null,
+ pollHandlers: null,
+
+ pipes: new Map(),
+
+ processes: new Map(),
+
+ messageCount: 0,
+
+ running: true,
+
+ init(details) {
+ this.signal = new Signal(details.signalFd);
+ this.updatePollFds();
+
+ setTimeout(this.loop.bind(this), 0);
+ },
+
+ shutdown() {
+ if (this.running) {
+ this.running = false;
+
+ this.signal.cleanup();
+ this.signal = null;
+
+ self.postMessage({msg: "close"});
+ self.close();
+ }
+ },
+
+ getPipe(pipeId) {
+ let pipe = this.pipes.get(pipeId);
+
+ if (!pipe) {
+ let error = new Error("File closed");
+ error.errorCode = SubprocessConstants.ERROR_END_OF_FILE;
+ throw error;
+ }
+ return pipe;
+ },
+
+ getProcess(processId) {
+ let process = this.processes.get(processId);
+
+ if (!process) {
+ throw new Error(`Invalid process ID: ${processId}`);
+ }
+ return process;
+ },
+
+ updatePollFds() {
+ let handlers = [this.signal,
+ ...this.pipes.values(),
+ ...this.processes.values()];
+
+ handlers = handlers.filter(handler => handler.pollEvents);
+
+ let pollfds = unix.pollfd.array(handlers.length)();
+
+ for (let [i, handler] of handlers.entries()) {
+ let pollfd = pollfds[i];
+
+ pollfd.fd = handler.fd;
+ pollfd.events = handler.pollEvents;
+ pollfd.revents = 0;
+ }
+
+ this.pollFds = pollfds;
+ this.pollHandlers = handlers;
+ },
+
+ loop() {
+ this.poll();
+ if (this.running) {
+ setTimeout(this.loop.bind(this), 0);
+ }
+ },
+
+ poll() {
+ let handlers = this.pollHandlers;
+ let pollfds = this.pollFds;
+
+ let timeout = this.messageCount > 0 ? 0 : POLL_TIMEOUT;
+ let count = libc.poll(pollfds, pollfds.length, timeout);
+
+ for (let i = 0; count && i < pollfds.length; i++) {
+ let pollfd = pollfds[i];
+ if (pollfd.revents) {
+ count--;
+
+ let handler = handlers[i];
+ try {
+ let success = false;
+ if (pollfd.revents & handler.pollEvents) {
+ success = handler.onReady();
+ }
+ // Only call the error handler in this iteration if we didn't also
+ // have a success. This is necessary because Linux systems set POLLHUP
+ // on a pipe when it's closed but there's still buffered data to be
+ // read, and Darwin sets POLLIN and POLLHUP on a closed pipe, even
+ // when there's no data to be read.
+ if (!success && (pollfd.revents & (LIBC.POLLERR | LIBC.POLLHUP | LIBC.POLLNVAL))) {
+ handler.onError();
+ }
+ } catch (e) {
+ console.error(e);
+ debug(`Worker error: ${e} :: ${e.stack}`);
+ handler.onError();
+ }
+
+ pollfd.revents = 0;
+ }
+ }
+ },
+
+ addProcess(process) {
+ this.processes.set(process.id, process);
+
+ for (let pipe of process.pipes) {
+ this.pipes.set(pipe.id, pipe);
+ }
+ },
+
+ cleanupProcess(process) {
+ this.processes.delete(process.id);
+ },
+};