test_subprocess_pipe_flags.js

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/* 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";

// fcntl commands for reading the flags set by the subprocess modules. The

// values are the same on Linux and macOS but are not exposed by

// ChromeUtils.getLibcConstants().

const F_GETFD = 1;

const F_GETFL = 3;

add_task(async function test_subprocess_pipe_flags() {

  const { getSubprocessImplForTest } = ChromeUtils.importESModule(

    "resource://gre/modules/Subprocess.sys.mjs"

);

  const { libc } = ChromeUtils.importESModule(

    "resource://gre/modules/subprocess/subprocess_unix.sys.mjs"

);

  const { FD_CLOEXEC, O_NONBLOCK } = ChromeUtils.getLibcConstants();

  const worker = getSubprocessImplForTest().Process.getWorker();

  equal(

    libc.fcntl(worker.signalFd, F_GETFD),

    FD_CLOEXEC,

    "The main-thread signal pipe has exactly FD_CLOEXEC set"

);

  const proc = await Subprocess.call({

    command: await Subprocess.pathSearch("cat"),

    stderr: "pipe",

});

  const fds = await worker.call("getFds", [proc.id]);

ok(

    fds.every(Number.isInteger),

    "The worker owns the stdin, stdout and stderr pipes"

);

  for (const fd of fds) {

    equal(

      libc.fcntl(fd, F_GETFD),

      FD_CLOEXEC,

      "Worker pipes have exactly FD_CLOEXEC set"

);

    equal(

      libc.fcntl(fd, F_GETFL) & O_NONBLOCK,

      O_NONBLOCK,

      "Worker pipes are nonblocking"

);

  const output = proc.stdout.readString(5);

  await proc.stdin.write("hello");

  equal(await output, "hello", "The subprocess pipes transfer data");

  await proc.stdin.close();

  equal((await proc.wait()).exitCode, 0, "The subprocess exits cleanly");

});