238726 2022-04-04 00:52:02 -0700 [Unix] Add UnixFileDescriptor, use it in IPC::Semaphore 2022-04-05 06:09:23 -0700 1 1 1 Unclassified WebKit New Bugs WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED https://bugs.webkit.org/show_bug.cgi?id=238801 InRadar P2 Normal --- 238593 238733 1 zan zan annulen aperez benjamin cdumez cgarcia cmarcelo ews-watchlist gyuyoung.kim ryuan.choi sergio webkit-bug-importer zdobersek oldest_to_newest 1857761 0 zan 2022-04-04 00:52:02 -0700 [Unix] Add UnixFileDescriptor, use it in IPC::Semaphore 1857763 1 456544 zan 2022-04-04 00:53:13 -0700 Created attachment 456544 Patch 1858062 2 456544 aperez 2022-04-04 14:18:59 -0700 Comment on attachment 456544 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=456544&action=review > Source/WTF/wtf/unix/UnixFileDescriptor.h:51 > + UnixFileDescriptor& operator=(const UnixFileDescriptor&) = delete; You could replace these two with WTF_MAKE_NONCOPYABLE(UnixFileDescriptor) > Source/WTF/wtf/unix/UnixFileDescriptor.h:56 > + o.value = -1; These two lines could be replaced with: value = std::exchange(o.value, -1); > Source/WebKit/Platform/IPC/unix/IPCSemaphoreUnix.cpp:129 > + encoder << m_fd.duplicate(); I think this is duplicating the UnixFileDescriptor twice unneedlessly, because the ArgumentCoder<…>::encode() function below will take another duplicate itself. > Source/WebKit/Shared/WebCoreArgumentCoders.cpp:3298 > + auto duplicate = fd.duplicate(); …here is where the second duplicate is made during encoding. I think this one here should be the only one needed. 1858273 3 456544 zan 2022-04-05 00:24:34 -0700 Comment on attachment 456544 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=456544&action=review >> Source/WTF/wtf/unix/UnixFileDescriptor.h:51 >> + UnixFileDescriptor& operator=(const UnixFileDescriptor&) = delete; > > You could replace these two with WTF_MAKE_NONCOPYABLE(UnixFileDescriptor) They are manually deleted just like the move constructor and assignment operators are manually defined. No need to reach out for additional macros. >> Source/WebKit/Shared/WebCoreArgumentCoders.cpp:3298 >> + auto duplicate = fd.duplicate(); > > …here is where the second duplicate is made during encoding. > I think this one here should be the only one needed. No, cause the `m_fd.duplicate()` in Semaphore::encode() returns an rvalue that's then passed to ArgumentCoder<>::encode(Encoder&, WTF::UnixFileDescriptor&&), which handles the object like the temporary that it is. 1858282 4 456544 cgarcia 2022-04-05 00:45:15 -0700 Comment on attachment 456544 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=456544&action=review I like the idea, but since the destructor is closing the fd, it's somehow like a smart pointer class, so I would follow the same patterns we are already familiar with. I would make it a class instead of a struct with get method > Source/WTF/wtf/unix/UnixFileDescriptor.h:35 > +struct UnixFileDescriptor { WTF_MAKE_NONCOPYABLE > Source/WTF/wtf/unix/UnixFileDescriptor.h:44 > + enum AdoptionTag { Adopt }; > + UnixFileDescriptor(int fd, AdoptionTag) > + : value(fd) > + { } > + > + enum DuplicationTag { Duplicate }; > + UnixFileDescriptor(int fd, DuplicationTag) Why not using a single enum and the same constructor that adopts or duplicates depending on the enum value. We could also make them private and add adoptFileDescriptor/duplicateFileDescritor. >> Source/WTF/wtf/unix/UnixFileDescriptor.h:56 >> + o.value = -1; > > These two lines could be replaced with: > > value = std::exchange(o.value, -1); that's release() value = o.release(); > Source/WTF/wtf/unix/UnixFileDescriptor.h:82 > + int value { -1 }; Being this a public member of the struct you can do foo.value = fd and mess it up. > Source/WebKit/Platform/IPC/IPCSemaphore.h:84 > + WTF::UnixFileDescriptor m_fd { }; We don't need the initialization now. >> Source/WebKit/Shared/WebCoreArgumentCoders.cpp:3298 >> + auto duplicate = fd.duplicate(); > > …here is where the second duplicate is made during encoding. > I think this one here should be the only one needed. I think it would be easier of IPC::Attachment used UnixFileDescriptor instead of int. 1858284 5 456544 zan 2022-04-05 00:56:35 -0700 Comment on attachment 456544 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=456544&action=review >> Source/WTF/wtf/unix/UnixFileDescriptor.h:44 >> + UnixFileDescriptor(int fd, DuplicationTag) > > Why not using a single enum and the same constructor that adopts or duplicates depending on the enum value. We could also make them private and add adoptFileDescriptor/duplicateFileDescritor. Because that means generated branches from testing the enum value. >>>> Source/WebKit/Shared/WebCoreArgumentCoders.cpp:3298 >>>> + auto duplicate = fd.duplicate(); >>> >>> …here is where the second duplicate is made during encoding. >>> I think this one here should be the only one needed. >> >> No, cause the `m_fd.duplicate()` in Semaphore::encode() returns an rvalue that's then passed to ArgumentCoder<>::encode(Encoder&, WTF::UnixFileDescriptor&&), which handles the object like the temporary that it is. > > I think it would be easier of IPC::Attachment used UnixFileDescriptor instead of int. In a different patch, cause it will require additional changes in ConnectionUnix.cpp. 1858288 6 456681 zan 2022-04-05 01:10:47 -0700 Created attachment 456681 Patch 1858305 7 456681 cgarcia 2022-04-05 02:03:29 -0700 Comment on attachment 456681 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=456681&action=review > Source/WTF/wtf/unix/UnixFileDescriptor.h:51 > + enum DuplicationTag { Duplicate }; > + UnixFileDescriptor(int fd, DuplicationTag) > + { > + if (fd >= 0) > + m_value = dupCloseOnExec(fd); > + } I think we can keep this private for now, since it's always used from ::duplicate(). > Source/WTF/wtf/unix/UnixFileDescriptor.h:88 > + using WTF::UnixFileDescriptor > Source/WebKit/Platform/IPC/unix/IPCSemaphoreUnix.cpp:44 > + m_fd = { eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK | EFD_SEMAPHORE), WTF::UnixFileDescriptor::Adopt }; I still prefer m_fd = adoptFileDescriptor(eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK | EFD_SEMAPHORE)); but no strong opinion if you really want to expose WTF::UnixFileDescriptor::Adopt and WTF::UnixFileDescriptor::Duplicate > Source/WebKit/Shared/WebCoreArgumentCoders.h:854 > +#if USE(UNIX_DOMAIN_SOCKETS) > + > +template<> struct ArgumentCoder<WTF::UnixFileDescriptor> { > + static void encode(Encoder&, const WTF::UnixFileDescriptor&); > + static void encode(Encoder&, WTF::UnixFileDescriptor&&); > + static std::optional<WTF::UnixFileDescriptor> decode(Decoder&); > +}; > + > +#endif This doesn't really belong here, since UnixFileDescriptor is not a WebCore class. Why don't you add the encode/decode methods to UnixFileDescriptor class? 1858320 8 456681 zan 2022-04-05 03:21:25 -0700 Comment on attachment 456681 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=456681&action=review >> Source/WTF/wtf/unix/UnixFileDescriptor.h:51 >> + } > > I think we can keep this private for now, since it's always used from ::duplicate(). I need it in the next patches. >> Source/WebKit/Shared/WebCoreArgumentCoders.h:854 >> +#endif > > This doesn't really belong here, since UnixFileDescriptor is not a WebCore class. Why don't you add the encode/decode methods to UnixFileDescriptor class? I don't have IPC::Attachment in WTF. 1858321 9 456681 zan 2022-04-05 03:23:22 -0700 Comment on attachment 456681 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=456681&action=review >>> Source/WebKit/Shared/WebCoreArgumentCoders.h:854 >>> +#endif >> >> This doesn't really belong here, since UnixFileDescriptor is not a WebCore class. Why don't you add the encode/decode methods to UnixFileDescriptor class? > > I don't have IPC::Attachment in WTF. There's also WTF::MachSendRight in this file, even when the definitions are kept somewhere else. 1858326 10 456688 zan 2022-04-05 03:45:15 -0700 Created attachment 456688 Patch for landing 1858327 11 456688 zdobersek 2022-04-05 03:48:57 -0700 Comment on attachment 456688 Patch for landing Clearing flags on attachment: 456688 Committed r292389 (249254@trunk): <https://commits.webkit.org/249254@trunk> 1858328 12 zdobersek 2022-04-05 03:49:04 -0700 All reviewed patches have been landed. Closing bug. 1858329 13 webkit-bug-importer 2022-04-05 03:50:19 -0700 <rdar://problem/91286018> 456544 2022-04-04 00:53:13 -0700 2022-04-05 01:10:41 -0700 Patch bug-238726-20220404095312.patch text/plain 14080 zan U3VidmVyc2lvbiBSZXZpc2lvbjogMjkyMjc4CmRpZmYgLS1naXQgYS9Tb3VyY2UvV1RGL0NoYW5n ZUxvZyBiL1NvdXJjZS9XVEYvQ2hhbmdlTG9nCmluZGV4IDhhM2M3NzU0NWY5MTcxZWMwYzViOTMw MGRjNzg3Y2Q2ZThlNGM4NjcuLmJkMmMyODM2NjU5N2VlOWZiNWQ2OWU2YTA4YWI5ZDljOGRjOGU4 YTkgMTAwNjQ0Ci0tLSBhL1NvdXJjZS9XVEYvQ2hhbmdlTG9nCisrKyBiL1NvdXJjZS9XVEYvQ2hh bmdlTG9nCkBAIC0xLDMgKzEsMjkgQEAKKzIwMjItMDQtMDQgIFphbiBEb2JlcnNlayAgPHpkb2Jl cnNla0BpZ2FsaWEuY29tPgorCisgICAgICAgIFtVbml4XSBBZGQgVW5peEZpbGVEZXNjcmlwdG9y LCB1c2UgaXQgaW4gSVBDOjpTZW1hcGhvcmUKKyAgICAgICAgaHR0cHM6Ly9idWdzLndlYmtpdC5v cmcvc2hvd19idWcuY2dpP2lkPTIzODcyNgorCisgICAgICAgIFJldmlld2VkIGJ5IE5PQk9EWSAo T09QUyEpLgorCisgICAgICAgIEFkZCB0aGUgVW5peEZpbGVEZXNjcmlwdG9yIHN0cnVjdCwgaW50 ZW5kZWQgYXMgYSB3cmFwcGVyIGZvciBhIGZpbGUKKyAgICAgICAgZGVzY3JpcHRvciBpbnRlZ2Vy 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