1 | /* |
2 | * Copyright (C) 2013 Apple Inc. All rights reserved. |
3 | * |
4 | * Redistribution and use in source and binary forms, with or without |
5 | * modification, are permitted provided that the following conditions |
6 | * are met: |
7 | * 1. Redistributions of source code must retain the above copyright |
8 | * notice, this list of conditions and the following disclaimer. |
9 | * 2. Redistributions in binary form must reproduce the above copyright |
10 | * notice, this list of conditions and the following disclaimer in the |
11 | * documentation and/or other materials provided with the distribution. |
12 | * |
13 | * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
14 | * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
15 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
16 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
17 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
18 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
19 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
20 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
21 | * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
22 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
23 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
24 | */ |
25 | |
26 | #include "config.h" |
27 | #include "OriginLock.h" |
28 | |
29 | namespace WebCore { |
30 | |
31 | String OriginLock::lockFileNameForPath(String originPath) |
32 | { |
33 | return FileSystem::pathByAppendingComponent(originPath, ".lock"_s ); |
34 | } |
35 | |
36 | OriginLock::OriginLock(String originPath) |
37 | : m_lockFileName(lockFileNameForPath(originPath).isolatedCopy()) |
38 | #if USE(FILE_LOCK) |
39 | , m_lockHandle(FileSystem::invalidPlatformFileHandle) |
40 | #endif |
41 | { |
42 | } |
43 | |
44 | OriginLock::~OriginLock() = default; |
45 | |
46 | void OriginLock::lock() |
47 | { |
48 | m_mutex.lock(); |
49 | |
50 | #if USE(FILE_LOCK) |
51 | m_lockHandle = FileSystem::openAndLockFile(m_lockFileName, FileSystem::FileOpenMode::Write); |
52 | if (m_lockHandle == FileSystem::invalidPlatformFileHandle) { |
53 | // The only way we can get here is if the directory containing the lock |
54 | // has been deleted or we were given a path to a non-existant directory. |
55 | // In that case, there's nothing we can do but cleanup and return. |
56 | m_mutex.unlock(); |
57 | return; |
58 | } |
59 | #endif |
60 | } |
61 | |
62 | void OriginLock::unlock() |
63 | { |
64 | #if USE(FILE_LOCK) |
65 | // If the file descriptor was uninitialized, then that means the directory |
66 | // containing the lock has been deleted before we opened the lock file, or |
67 | // we were given a path to a non-existant directory. Which, in turn, means |
68 | // that there's nothing to unlock. |
69 | if (m_lockHandle == FileSystem::invalidPlatformFileHandle) |
70 | return; |
71 | |
72 | FileSystem::unlockAndCloseFile(m_lockHandle); |
73 | m_lockHandle = FileSystem::invalidPlatformFileHandle; |
74 | #endif |
75 | |
76 | m_mutex.unlock(); |
77 | } |
78 | |
79 | void OriginLock::deleteLockFile(String originPath) |
80 | { |
81 | UNUSED_PARAM(originPath); |
82 | #if USE(FILE_LOCK) |
83 | String lockFileName = OriginLock::lockFileNameForPath(originPath); |
84 | FileSystem::deleteFile(lockFileName); |
85 | #endif |
86 | } |
87 | |
88 | } // namespace WebCore |
89 | |