TestProfileLockRetry.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* 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/. */

#include "gtest/gtest.h"

#include <sys/eventfd.h>

#include <sched.h>

#include "nsComponentManagerUtils.h"

#include "nsCOMPtr.h"

#include "nsIFile.h"

#include "nsProfileLock.h"

#include "nsString.h"

TEST(ProfileLock, RetryLock)

  char templ[] = "/tmp/profilelocktest.XXXXXX";

  char* tmpdir = mkdtemp(templ);

  ASSERT_NE(tmpdir, nullptr);

  nsProfileLock myLock;

  nsProfileLock myLock2;

  nsresult rv;

  nsCOMPtr<nsIFile> dir;

  rv = NS_NewNativeLocalFile(nsCString(tmpdir), getter_AddRefs(dir));

  ASSERT_EQ(NS_SUCCEEDED(rv), true);

  int eventfd_fd = eventfd(0, 0);

  ASSERT_GE(eventfd_fd, 0);

  // fcntl advisory locks are per process, so it's hard

  // to avoid using fork here.

  pid_t childpid = fork();

  if (childpid) {

    // parent

    // blocking read causing us to lose the race

    eventfd_t value;

    EXPECT_EQ(0, eventfd_read(eventfd_fd, &value));

    rv = myLock2.Lock(dir, nullptr);

    EXPECT_EQ(NS_ERROR_FILE_ACCESS_DENIED, rv);

    // kill the child

    EXPECT_EQ(0, kill(childpid, SIGTERM));

    // reap zombie (required to collect the lock)

    int status;

    EXPECT_EQ(childpid, waitpid(childpid, &status, 0));

    rv = myLock2.Lock(dir, nullptr);

    EXPECT_EQ(NS_SUCCEEDED(rv), true);

  } else {

    // child

    rv = myLock.Lock(dir, nullptr);

    ASSERT_EQ(NS_SUCCEEDED(rv), true);

    // unblock parent

    EXPECT_EQ(0, eventfd_write(eventfd_fd, 1));

    // parent will kill us

    for (;;) sleep(1);

  close(eventfd_fd);

  myLock.Cleanup();

  myLock2.Cleanup();