зеркало из https://github.com/mozilla/gecko-dev.git
74 строки
1.8 KiB
C++
74 строки
1.8 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "gtest/gtest.h"
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#include <sys/eventfd.h>
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#include <sched.h>
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#include "nsCOMPtr.h"
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#include "nsIFile.h"
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#include "nsProfileLock.h"
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#include "nsString.h"
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TEST(ProfileLock, RetryLock)
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{
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char templ[] = "/tmp/profilelocktest.XXXXXX";
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char* tmpdir = mkdtemp(templ);
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ASSERT_NE(tmpdir, nullptr);
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nsProfileLock myLock;
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nsProfileLock myLock2;
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nsresult rv;
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nsCOMPtr<nsIFile> dir(do_CreateInstance(NS_LOCAL_FILE_CONTRACTID, &rv));
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ASSERT_EQ(NS_SUCCEEDED(rv), true);
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rv = dir->InitWithNativePath(nsCString(tmpdir));
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ASSERT_EQ(NS_SUCCEEDED(rv), true);
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int eventfd_fd = eventfd(0, 0);
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ASSERT_GE(eventfd_fd, 0);
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// fcntl advisory locks are per process, so it's hard
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// to avoid using fork here.
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pid_t childpid = fork();
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if (childpid) {
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// parent
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// blocking read causing us to lose the race
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eventfd_t value;
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EXPECT_EQ(0, eventfd_read(eventfd_fd, &value));
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rv = myLock2.Lock(dir, nullptr);
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EXPECT_EQ(NS_ERROR_FILE_ACCESS_DENIED, rv);
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// kill the child
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EXPECT_EQ(0, kill(childpid, SIGTERM));
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// reap zombie (required to collect the lock)
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int status;
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EXPECT_EQ(childpid, waitpid(childpid, &status, 0));
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rv = myLock2.Lock(dir, nullptr);
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EXPECT_EQ(NS_SUCCEEDED(rv), true);
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} else {
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// child
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rv = myLock.Lock(dir, nullptr);
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ASSERT_EQ(NS_SUCCEEDED(rv), true);
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// unblock parent
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EXPECT_EQ(0, eventfd_write(eventfd_fd, 1));
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// parent will kill us
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for (;;) sleep(1);
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}
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close(eventfd_fd);
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myLock.Cleanup();
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myLock2.Cleanup();
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}
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