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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/183176">183176</a></dd>
<dt>Author</dt> <dd>carlosgc@webkit.org</dd>
<dt>Date</dt> <dd>2015-04-23 00:28:48 -0700 (Thu, 23 Apr 2015)</dd>
</dl>
<h3>Log Message</h3>
<pre>[UNIX] Simplify the file descriptor handling in SharedMemory
https://bugs.webkit.org/show_bug.cgi?id=144046
Reviewed by Darin Adler.
Simplify the file descriptor handling and clarify its ownership by
using IPC::Attachment in SharedMemory::Handle instead of fd and
size members. SharedMemory::Handle::adoptFromAttachment() has been
renamed as SharedMemory::Handle::adoptAttachment() and receives an
IPC::Attachment. And SharedMemory::Handle::releaseToAttachment()
has been renamed as SharedMemory::Handle::releaseAttachment().
* Platform/IPC/Attachment.h: Add move constructor and move assigned operator.
* Platform/IPC/Connection.h:
(IPC::Connection::identifierIsNull): A file descriptor is null
when it's -1 no 0.
* Platform/IPC/unix/AttachmentUnix.cpp:
(IPC::Attachment::Attachment):
(IPC::Attachment::operator=):
(IPC::Attachment::dispose): Reset the file descriptor after
closing it.
* Platform/IPC/unix/ConnectionUnix.cpp:
(IPC::Connection::processMessage): Use
SharedMemory::Handle::adoptAttachment() that receives an
IPC::Attachment now.
(IPC::Connection::sendOutgoingMessage): Use
SharedMemory::Handle::releaseAttachment().
* Platform/SharedMemory.h:
* Platform/unix/SharedMemoryUnix.cpp:
(WebKit::SharedMemory::Handle::Handle): Remove initializers for
file descriptor and size members.
(WebKit::SharedMemory::Handle::clear): Dispose the attachment.
(WebKit::SharedMemory::Handle::isNull): Handle is null if the
attachment file descriptor is -1.
(WebKit::SharedMemory::Handle::encode): Use releaseAttachment().
(WebKit::SharedMemory::Handle::decode): Use adoptAttachment().
(WebKit::SharedMemory::Handle::releaseAttachment): Implement it
using move.
(WebKit::SharedMemory::Handle::adoptAttachment): Ditto.
(WebKit::SharedMemory::map): Use
IPC::Attachment::releaseFileDescriptor() instead of manually
changing the member.
(WebKit::SharedMemory::createHandle): Initialize the handle
attachment with the duplicated file descriptor and size.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkSourceWebKit2ChangeLog">trunk/Source/WebKit2/ChangeLog</a></li>
<li><a href="#trunkSourceWebKit2PlatformIPCAttachmenth">trunk/Source/WebKit2/Platform/IPC/Attachment.h</a></li>
<li><a href="#trunkSourceWebKit2PlatformIPCConnectionh">trunk/Source/WebKit2/Platform/IPC/Connection.h</a></li>
<li><a href="#trunkSourceWebKit2PlatformIPCunixAttachmentUnixcpp">trunk/Source/WebKit2/Platform/IPC/unix/AttachmentUnix.cpp</a></li>
<li><a href="#trunkSourceWebKit2PlatformIPCunixConnectionUnixcpp">trunk/Source/WebKit2/Platform/IPC/unix/ConnectionUnix.cpp</a></li>
<li><a href="#trunkSourceWebKit2PlatformSharedMemoryh">trunk/Source/WebKit2/Platform/SharedMemory.h</a></li>
<li><a href="#trunkSourceWebKit2PlatformunixSharedMemoryUnixcpp">trunk/Source/WebKit2/Platform/unix/SharedMemoryUnix.cpp</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkSourceWebKit2ChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebKit2/ChangeLog (183175 => 183176)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebKit2/ChangeLog 2015-04-23 07:24:57 UTC (rev 183175)
+++ trunk/Source/WebKit2/ChangeLog 2015-04-23 07:28:48 UTC (rev 183176)
</span><span class="lines">@@ -1,3 +1,50 @@
</span><ins>+2015-04-23 Carlos Garcia Campos <cgarcia@igalia.com>
+
+ [UNIX] Simplify the file descriptor handling in SharedMemory
+ https://bugs.webkit.org/show_bug.cgi?id=144046
+
+ Reviewed by Darin Adler.
+
+ Simplify the file descriptor handling and clarify its ownership by
+ using IPC::Attachment in SharedMemory::Handle instead of fd and
+ size members. SharedMemory::Handle::adoptFromAttachment() has been
+ renamed as SharedMemory::Handle::adoptAttachment() and receives an
+ IPC::Attachment. And SharedMemory::Handle::releaseToAttachment()
+ has been renamed as SharedMemory::Handle::releaseAttachment().
+
+ * Platform/IPC/Attachment.h: Add move constructor and move assigned operator.
+ * Platform/IPC/Connection.h:
+ (IPC::Connection::identifierIsNull): A file descriptor is null
+ when it's -1 no 0.
+ * Platform/IPC/unix/AttachmentUnix.cpp:
+ (IPC::Attachment::Attachment):
+ (IPC::Attachment::operator=):
+ (IPC::Attachment::dispose): Reset the file descriptor after
+ closing it.
+ * Platform/IPC/unix/ConnectionUnix.cpp:
+ (IPC::Connection::processMessage): Use
+ SharedMemory::Handle::adoptAttachment() that receives an
+ IPC::Attachment now.
+ (IPC::Connection::sendOutgoingMessage): Use
+ SharedMemory::Handle::releaseAttachment().
+ * Platform/SharedMemory.h:
+ * Platform/unix/SharedMemoryUnix.cpp:
+ (WebKit::SharedMemory::Handle::Handle): Remove initializers for
+ file descriptor and size members.
+ (WebKit::SharedMemory::Handle::clear): Dispose the attachment.
+ (WebKit::SharedMemory::Handle::isNull): Handle is null if the
+ attachment file descriptor is -1.
+ (WebKit::SharedMemory::Handle::encode): Use releaseAttachment().
+ (WebKit::SharedMemory::Handle::decode): Use adoptAttachment().
+ (WebKit::SharedMemory::Handle::releaseAttachment): Implement it
+ using move.
+ (WebKit::SharedMemory::Handle::adoptAttachment): Ditto.
+ (WebKit::SharedMemory::map): Use
+ IPC::Attachment::releaseFileDescriptor() instead of manually
+ changing the member.
+ (WebKit::SharedMemory::createHandle): Initialize the handle
+ attachment with the duplicated file descriptor and size.
+
</ins><span class="cx"> 2015-04-22 Darin Adler <darin@apple.com>
</span><span class="cx">
</span><span class="cx"> Remove OwnPtr and PassOwnPtr use from WebKit/cf, WebKit/mac, and WebKit2
</span></span></pre></div>
<a id="trunkSourceWebKit2PlatformIPCAttachmenth"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebKit2/Platform/IPC/Attachment.h (183175 => 183176)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebKit2/Platform/IPC/Attachment.h 2015-04-23 07:24:57 UTC (rev 183175)
+++ trunk/Source/WebKit2/Platform/IPC/Attachment.h 2015-04-23 07:28:48 UTC (rev 183176)
</span><span class="lines">@@ -53,6 +53,10 @@
</span><span class="cx"> #if OS(DARWIN)
</span><span class="cx"> Attachment(mach_port_name_t port, mach_msg_type_name_t disposition);
</span><span class="cx"> #elif USE(UNIX_DOMAIN_SOCKETS)
</span><ins>+ Attachment(Attachment&&);
+ Attachment& operator=(Attachment&&);
+ Attachment(const Attachment&) = default;
+ Attachment& operator=(Attachment&) = default;
</ins><span class="cx"> Attachment(int fileDescriptor, size_t);
</span><span class="cx"> Attachment(int fileDescriptor);
</span><span class="cx"> #endif
</span><span class="lines">@@ -85,7 +89,7 @@
</span><span class="cx"> mach_port_name_t m_port;
</span><span class="cx"> mach_msg_type_name_t m_disposition;
</span><span class="cx"> #elif USE(UNIX_DOMAIN_SOCKETS)
</span><del>- int m_fileDescriptor;
</del><ins>+ int m_fileDescriptor { -1 };
</ins><span class="cx"> size_t m_size;
</span><span class="cx"> #endif
</span><span class="cx"> };
</span></span></pre></div>
<a id="trunkSourceWebKit2PlatformIPCConnectionh"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebKit2/Platform/IPC/Connection.h (183175 => 183176)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebKit2/Platform/IPC/Connection.h 2015-04-23 07:24:57 UTC (rev 183175)
+++ trunk/Source/WebKit2/Platform/IPC/Connection.h 2015-04-23 07:28:48 UTC (rev 183176)
</span><span class="lines">@@ -129,7 +129,7 @@
</span><span class="cx"> pid_t remoteProcessID() const;
</span><span class="cx"> #elif USE(UNIX_DOMAIN_SOCKETS)
</span><span class="cx"> typedef int Identifier;
</span><del>- static bool identifierIsNull(Identifier identifier) { return !identifier; }
</del><ins>+ static bool identifierIsNull(Identifier identifier) { return identifier == -1; }
</ins><span class="cx">
</span><span class="cx"> struct SocketPair {
</span><span class="cx"> int client;
</span></span></pre></div>
<a id="trunkSourceWebKit2PlatformIPCunixAttachmentUnixcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebKit2/Platform/IPC/unix/AttachmentUnix.cpp (183175 => 183176)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebKit2/Platform/IPC/unix/AttachmentUnix.cpp 2015-04-23 07:24:57 UTC (rev 183175)
+++ trunk/Source/WebKit2/Platform/IPC/unix/AttachmentUnix.cpp 2015-04-23 07:28:48 UTC (rev 183176)
</span><span class="lines">@@ -45,10 +45,35 @@
</span><span class="cx"> {
</span><span class="cx"> }
</span><span class="cx">
</span><ins>+Attachment::Attachment(Attachment&& attachment)
+ : m_type(attachment.m_type)
+ , m_fileDescriptor(attachment.m_fileDescriptor)
+ , m_size(attachment.m_size)
+{
+ attachment.m_type = Uninitialized;
+ attachment.m_fileDescriptor = -1;
+ attachment.m_size = 0;
+}
+
+Attachment& Attachment::operator=(Attachment&& attachment)
+{
+ m_type = attachment.m_type;
+ attachment.m_type = Uninitialized;
+ m_fileDescriptor = attachment.m_fileDescriptor;
+ attachment.m_fileDescriptor = -1;
+ m_size = attachment.m_size;
+ attachment.m_size = 0;
+
+ return *this;
+}
+
</ins><span class="cx"> void Attachment::dispose()
</span><span class="cx"> {
</span><del>- if (m_fileDescriptor != -1)
- closeWithRetry(m_fileDescriptor);
</del><ins>+ if (m_fileDescriptor == -1)
+ return;
+
+ closeWithRetry(m_fileDescriptor);
+ m_fileDescriptor = -1;
</ins><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> } // namespace IPC
</span></span></pre></div>
<a id="trunkSourceWebKit2PlatformIPCunixConnectionUnixcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebKit2/Platform/IPC/unix/ConnectionUnix.cpp (183175 => 183176)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebKit2/Platform/IPC/unix/ConnectionUnix.cpp 2015-04-23 07:24:57 UTC (rev 183175)
+++ trunk/Source/WebKit2/Platform/IPC/unix/ConnectionUnix.cpp 2015-04-23 07:28:48 UTC (rev 183176)
</span><span class="lines">@@ -247,7 +247,7 @@
</span><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> WebKit::SharedMemory::Handle handle;
</span><del>- handle.adoptFromAttachment(m_fileDescriptors[attachmentFileDescriptorCount - 1], attachmentInfo[attachmentCount].getSize());
</del><ins>+ handle.adoptAttachment(IPC::Attachment(m_fileDescriptors[attachmentFileDescriptorCount - 1], attachmentInfo[attachmentCount].getSize()));
</ins><span class="cx">
</span><span class="cx"> oolMessageBody = WebKit::SharedMemory::map(handle, WebKit::SharedMemory::Protection::ReadOnly);
</span><span class="cx"> if (!oolMessageBody) {
</span><span class="lines">@@ -445,7 +445,7 @@
</span><span class="cx">
</span><span class="cx"> memcpy(oolMessageBody->data(), encoder->buffer(), encoder->bufferSize());
</span><span class="cx">
</span><del>- attachments.append(handle.releaseToAttachment());
</del><ins>+ attachments.append(handle.releaseAttachment());
</ins><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> struct msghdr message;
</span></span></pre></div>
<a id="trunkSourceWebKit2PlatformSharedMemoryh"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebKit2/Platform/SharedMemory.h (183175 => 183176)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebKit2/Platform/SharedMemory.h 2015-04-23 07:24:57 UTC (rev 183175)
+++ trunk/Source/WebKit2/Platform/SharedMemory.h 2015-04-23 07:28:48 UTC (rev 183176)
</span><span class="lines">@@ -69,17 +69,17 @@
</span><span class="cx"> static bool decode(IPC::ArgumentDecoder&, Handle&);
</span><span class="cx">
</span><span class="cx"> #if USE(UNIX_DOMAIN_SOCKETS)
</span><del>- IPC::Attachment releaseToAttachment() const;
- void adoptFromAttachment(int fileDescriptor, size_t);
</del><ins>+ IPC::Attachment releaseAttachment() const;
+ void adoptAttachment(IPC::Attachment&&);
</ins><span class="cx"> #endif
</span><span class="cx"> private:
</span><span class="cx"> friend class SharedMemory;
</span><span class="cx"> #if OS(DARWIN)
</span><span class="cx"> mutable mach_port_t m_port;
</span><ins>+ size_t m_size;
</ins><span class="cx"> #elif USE(UNIX_DOMAIN_SOCKETS)
</span><del>- mutable int m_fileDescriptor;
</del><ins>+ mutable IPC::Attachment m_attachment;
</ins><span class="cx"> #endif
</span><del>- size_t m_size;
</del><span class="cx"> };
</span><span class="cx">
</span><span class="cx"> static RefPtr<SharedMemory> allocate(size_t);
</span></span></pre></div>
<a id="trunkSourceWebKit2PlatformunixSharedMemoryUnixcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebKit2/Platform/unix/SharedMemoryUnix.cpp (183175 => 183176)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebKit2/Platform/unix/SharedMemoryUnix.cpp 2015-04-23 07:24:57 UTC (rev 183175)
+++ trunk/Source/WebKit2/Platform/unix/SharedMemoryUnix.cpp 2015-04-23 07:28:48 UTC (rev 183176)
</span><span class="lines">@@ -47,8 +47,6 @@
</span><span class="cx"> namespace WebKit {
</span><span class="cx">
</span><span class="cx"> SharedMemory::Handle::Handle()
</span><del>- : m_fileDescriptor(-1)
- , m_size(0)
</del><span class="cx"> {
</span><span class="cx"> }
</span><span class="cx">
</span><span class="lines">@@ -59,18 +57,17 @@
</span><span class="cx">
</span><span class="cx"> void SharedMemory::Handle::clear()
</span><span class="cx"> {
</span><del>- if (!isNull())
- closeWithRetry(m_fileDescriptor);
</del><ins>+ m_attachment.dispose();
</ins><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> bool SharedMemory::Handle::isNull() const
</span><span class="cx"> {
</span><del>- return m_fileDescriptor == -1;
</del><ins>+ return m_attachment.fileDescriptor() == -1;
</ins><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> void SharedMemory::Handle::encode(IPC::ArgumentEncoder& encoder) const
</span><span class="cx"> {
</span><del>- encoder << releaseToAttachment();
</del><ins>+ encoder << releaseAttachment();
</ins><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> bool SharedMemory::Handle::decode(IPC::ArgumentDecoder& decoder, Handle& handle)
</span><span class="lines">@@ -82,24 +79,21 @@
</span><span class="cx"> if (!decoder.decode(attachment))
</span><span class="cx"> return false;
</span><span class="cx">
</span><del>- handle.adoptFromAttachment(attachment.releaseFileDescriptor(), attachment.size());
</del><ins>+ handle.adoptAttachment(WTF::move(attachment));
</ins><span class="cx"> return true;
</span><span class="cx"> }
</span><span class="cx">
</span><del>-IPC::Attachment SharedMemory::Handle::releaseToAttachment() const
</del><ins>+IPC::Attachment SharedMemory::Handle::releaseAttachment() const
</ins><span class="cx"> {
</span><del>- int temp = m_fileDescriptor;
- m_fileDescriptor = -1;
- return IPC::Attachment(temp, m_size);
</del><ins>+ ASSERT(!isNull());
+ return WTF::move(m_attachment);
</ins><span class="cx"> }
</span><span class="cx">
</span><del>-void SharedMemory::Handle::adoptFromAttachment(int fileDescriptor, size_t size)
</del><ins>+void SharedMemory::Handle::adoptAttachment(IPC::Attachment&& attachment)
</ins><span class="cx"> {
</span><del>- ASSERT(!m_size);
</del><span class="cx"> ASSERT(isNull());
</span><span class="cx">
</span><del>- m_fileDescriptor = fileDescriptor;
- m_size = size;
</del><ins>+ m_attachment = WTF::move(attachment);
</ins><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> RefPtr<SharedMemory> SharedMemory::allocate(size_t size)
</span><span class="lines">@@ -161,15 +155,14 @@
</span><span class="cx"> {
</span><span class="cx"> ASSERT(!handle.isNull());
</span><span class="cx">
</span><del>- void* data = mmap(0, handle.m_size, accessModeMMap(protection), MAP_SHARED, handle.m_fileDescriptor, 0);
</del><ins>+ void* data = mmap(0, handle.m_attachment.size(), accessModeMMap(protection), MAP_SHARED, handle.m_attachment.fileDescriptor(), 0);
</ins><span class="cx"> if (data == MAP_FAILED)
</span><del>- return 0;
</del><ins>+ return nullptr;
</ins><span class="cx">
</span><span class="cx"> RefPtr<SharedMemory> instance = adoptRef(new SharedMemory());
</span><span class="cx"> instance->m_data = data;
</span><del>- instance->m_fileDescriptor = handle.m_fileDescriptor;
- instance->m_size = handle.m_size;
- handle.m_fileDescriptor = -1;
</del><ins>+ instance->m_fileDescriptor = handle.m_attachment.releaseFileDescriptor();
+ instance->m_size = handle.m_attachment.size();
</ins><span class="cx"> return instance;
</span><span class="cx"> }
</span><span class="cx">
</span><span class="lines">@@ -202,8 +195,7 @@
</span><span class="cx"> return false;
</span><span class="cx"> }
</span><span class="cx"> }
</span><del>- handle.m_fileDescriptor = duplicatedHandle;
- handle.m_size = m_size;
</del><ins>+ handle.m_attachment = IPC::Attachment(duplicatedHandle, m_size);
</ins><span class="cx"> return true;
</span><span class="cx"> }
</span><span class="cx">
</span></span></pre>
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