227740 2021-07-07 03:07:59 -0700 Allow custom IPC::Attachment messaging in ConnectionUnix.cpp 2022-05-05 02:57:39 -0700 1 1 1 Unclassified WebKit WPE WebKit WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED P2 Normal --- 1 ifernandez ifernandez bugs-noreply kkinnunen mcatanzaro webkit-bug-importer zdobersek oldest_to_newest 1775234 0 ifernandez 2021-07-07 03:07:59 -0700 We need to pass AHardwareBuffer instance from the UIProcess to the WebProcess, which requires calling functions such as AHardwareBuffer_sendHandleToUnixSocket(). By adding custom IPC::Attachmentmessaging we can call the AHardwareBuffer helper functions to pass and get AHardwareBuffers via IPC 1775236 1 433021 ifernandez 2021-07-07 03:11:54 -0700 Created attachment 433021 Patch 1775560 2 433021 mcatanzaro 2021-07-07 18:04:28 -0700 Comment on attachment 433021 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=433021&action=review > Source/WebKit/Platform/IPC/unix/ConnectionUnix.cpp:59 > -#endif // SOCK_SEQPACKET > +#endif // SOCK_SEQPACKET > > -namespace IPC { > +namespace IPC { I assume there was some accident with this patch? :) 1776310 3 ifernandez 2021-07-12 07:23:10 -0700 yes, it was just a compilation test to discard what it looked like a intermittent compilation error bug 226919 I'll upload the real patch soon :) 1781637 4 434836 ifernandez 2021-08-03 09:49:35 -0700 Created attachment 434836 Patch Implement CustomWriterType Attachment 1781638 5 ifernandez 2021-08-03 09:54:58 -0700 This is an example of how the API can be used to send aHardwareBuffer via IPC: void ArgumentCoder<PlatformXR::AHardwareBufferWrapper>::encode(Encoder& encoder, const PlatformXR::AHardwareBufferWrapper& wrapper) { auto hardwarebuffer = wrapper.hardwarebuffer; Attachment attachment(Attachment::CustomWriter { [hardwarebuffer](int socketDescriptor) { while (true) { int ret = AHardwareBuffer_sendHandleToUnixSocket(hardwarebuffer, socketDescriptor); if (!ret || ret != -EAGAIN) break; } }}); encoder << attachment; } bool ArgumentCoder<PlatformXR::AHardwareBufferWrapper>::decode(Decoder& decoder, PlatformXR::AHardwareBufferWrapper& wrapper) { Attachment attachment; if (!decoder.decode(attachment)) return false; auto socketDescriptor = WTF::get<Attachment::SocketDescriptor>(attachment.customWriter()); while (true) { auto ret = AHardwareBuffer_recvHandleFromUnixSocket(socketDescriptor, &wrapper.hardwarebuffer); if (!ret || ret != -EAGAIN) break; } return true; } 1782489 6 435068 ifernandez 2021-08-06 08:08:30 -0700 Created attachment 435068 Patch Use WTF::function instead of std::function 1782494 7 435068 zdobersek 2021-08-06 08:40:26 -0700 Comment on attachment 435068 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=435068&action=review > Source/WebKit/Platform/IPC/unix/ConnectionUnix.cpp:593 > + for (size_t i = 0; i < attachments.size(); ++i) { for (auto& attachment : attachments) 1782851 8 435176 ifernandez 2021-08-09 02:24:00 -0700 Created attachment 435176 Patch for landing 1782852 9 435177 ifernandez 2021-08-09 02:25:35 -0700 Created attachment 435177 Patch for landing 1782856 10 ews-feeder 2021-08-09 02:58:30 -0700 Committed r280769 (240353@main): <https://commits.webkit.org/240353@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 435177. 1866796 11 kkinnunen 2022-05-05 02:57:39 -0700 Did the client for this ever land? I think this is a fair deviation of the intended purpose of Attachment, and maybe forms undue cognitive overhead while maintenance. Hanging arbitrary function closure to the IPC message attachment is cumbersome as it's unclear what is the contract to call the function. What thread is it ok to call? Is it ok to call many times? What's the lifetime of the closed variables? In the example in the comments, there's a potential to try to access a already freed ANB. Message send can be delayed, and as such it's not guaranteed that the ANB pointer closed by the function is alive at the time of actual message send. Some time in the future the non-Cocoa and Cocoa parts could/should/must share more of the implementation. In these cases, it's not ok to run arbitrary code, as the send may happen in other thread. The intended use of IPC::Attachment is that all objects that cannot be transferred as pure data are stored in IPC::Attachment. In this case, it'd be better to store an owning reference to a ANB in the Attachment, and then explicitly say "Connection knows how to transfer UnixFileDescriptor" (e.g this is already there) "Connection knows how to transfer ANB" (e.g. you make ConnectionUnix.cpp call AHardwareBuffer_sendHandleToUnixSocket et al) So Unix variant of Connection would have class Attachment { std::variant<UnixFileDescriptor #if USE(ANDROID_NATIVE_BUFFER) , Ref<AHardwareBuffer> #endif > }; (Ref<AHardwareBuffer> uses AHardwareBuffer_acquire, AHardwareBuffer_release to implement ref(), unref()) 433021 2021-07-07 03:11:54 -0700 2021-08-03 09:49:30 -0700 Patch bug-227740-20210707121153.patch text/plain 1286 ifernandez U3VidmVyc2lvbiBSZXZpc2lvbjogMjc5NTgwCmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViS2l0L0No YW5nZUxvZyBiL1NvdXJjZS9XZWJLaXQvQ2hhbmdlTG9nCmluZGV4IDI3NDcxZjhkZTg5ODA4Yjk2 MGE0ZTQ2OThmZTdjN2ZjN2JlMzU2MzEuLjUzOWU0NTFlZjVlNTQ2YjUzYjU4OWNmMDYzYmQ4Y2Fh 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