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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(do_CreateInstance(NS_LOCAL_FILE_CONTRACTID, &rv));
ASSERT_EQ(NS_SUCCEEDED(rv), true);
rv = dir->InitWithNativePath(nsCString(tmpdir));
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();
}