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fix(libkernel): accept NOTE_EXTEND on a directory watch on Windows 

FreeBSD's vfs_kqfilter checks neither the vnode type nor fflags, so the
registration is valid; it is only delivered for a move between directories,
which the Windows directory handle cannot tell from a removal plus an addition.
Also moves the TechnicalDebt entries to docs/dev/debt after main split the file.

Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
Adrià Franch 2026-10-12 22:37:31 +02:00
parent 28043ff928
commit b7c67a3364
3 changed files with 3 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
core/libs/prx/libkernel/Equeue/src/FileEvent.cpp
View File

@ -288,9 +288,6 @@ void RunHostWatch(std::shared_ptr<VnodeWatch> watch, HostWatch host) {
int OpenHostWatch(int descriptor, std::uint32_t notes, HostWatch& host) {
if (const auto directory = File::DirectoryDescriptorPath(descriptor)) {
if ((notes & NOTE_EXTEND) != 0) {
NotImplemented_nid_no_patch("EVFILT_VNODE: NOTE_EXTEND on a directory");
}
host.directory = true;
host.target = ::CreateFileW(directory->wstring().c_str(), FILE_LIST_DIRECTORY | FILE_READ_ATTRIBUTES,
FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, nullptr, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, nullptr);

2
docs/dev/debt/libSceNet.md
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@ -2,7 +2,7 @@
### Unknown function info
- PPSA01530, PPSA23827 and PPSA13356 imports declared without parameters, signatures unknown, added without an implementation because the titles fail to load without them: [sceNetShowIfconfig](../../../core/libs/prx/libSceNet/Export.cpp) (libSceNet), [sce::Json::Value::setNullAccessCallBack](../../../core/libs/prx/libSceJson2/Export.cpp) (libSceJson2), [kqueue and kevent](../../../core/libs/prx/libkernel/Equeue/Equeue.cpp) (libkernel), and [scePadUnknown_n3kSX62fgNo](../../../core/libs/prx/libScePad/Export.cpp) (libScePad), whose real name is unknown. [_sceUltWaitingQueueResourcePoolCreate, _sceUltSemaphoreCreate, _sceUltMutexOptParamInitialize, _sceUltMutexCreate, _sceUltQueueDataResourcePoolCreate and _sceUltQueueCreate](../../../core/libs/prx/libSceUlt/Export.cpp) (libSceUlt) forward to the exports without the underscore; that their argument lists match is inferred from the other underscore Ult exports, not measured.
- PPSA01530 and PPSA13356 imports declared without parameters, signatures unknown, added without an implementation because the titles fail to load without them: [sceNetShowIfconfig](../../../core/libs/prx/libSceNet/Export.cpp) (libSceNet), [sce::Json::Value::setNullAccessCallBack](../../../core/libs/prx/libSceJson2/Export.cpp) (libSceJson2), and [scePadUnknown_n3kSX62fgNo](../../../core/libs/prx/libScePad/Export.cpp) (libScePad), whose real name is unknown. [_sceUltWaitingQueueResourcePoolCreate, _sceUltSemaphoreCreate, _sceUltMutexOptParamInitialize, _sceUltMutexCreate, _sceUltQueueDataResourcePoolCreate and _sceUltQueueCreate](../../../core/libs/prx/libSceUlt/Export.cpp) (libSceUlt) forward to the exports without the underscore; that their argument lists match is inferred from the other underscore Ult exports, not measured.
- [sceHttp2GetMemoryPoolStats, sceSslGetMemoryPoolStats, sceNetGetMemoryPoolStats](../../../core/libs/prx/libSceNet/Export.cpp) (libSceHttp2, libSceSsl, libSceNet) - the signatures `(int id, stats*)`, the layouts (pool size, peak and current use, and for Http2 and Ssl a 32-bit reserved field) and the error codes were measured on a PS5 (firmware 13.60). The pool size is the one given at init or pool creation; nothing is allocated from these pools, so the peak and current use are 0, where the console already reports use right after initialization (0x15C0 bytes for Ssl, 0x1640 for Http2 and 4 for a Net pool)
- [sceNetShowNetstat](../../../core/libs/prx/libSceNet/Export.cpp) (libSceNet) - imported by PPSA11386 and not called during its start-up; unknown signature, declared without parameters

2
docs/dev/debt/libkernel.md
View File

@ -91,6 +91,8 @@
### Functional
- [JIT shared memory](../../../core/libs/prx/libkernel/DirectMemory/Jit.cpp) (libkernel) - `sceKernelJitCreateSharedMemory`, `sceKernelJitCreateAliasOfSharedMemory` and `sceKernelJitMapSharedMemory` take the signatures of [Orbital](https://github.com/AlexAltea/orbital)'s `tools/ida/db_types.json` (name, length, maximum protection, descriptor out; descriptor, maximum protection, descriptor out; descriptor, protection, address in and out), which ps4sdk, ps5-jar-loader and the call sites in RetroArch PPSA99169, XPSemu PPSA97358 and VLC PPSA85300 match; SharpProspero declares the alias as returning the descriptor. The object is a host anonymous file shared by its descriptors (a `memfd` on Linux, a delete-on-close temporary file mapped as an executable section on Windows), the alias is a duplicate descriptor, and every map maps the whole object, so writes through one view show through the others; a non-null address is a hint, as in `mmap` without `MAP_FIXED`. Not measured on the console: a length that is zero or not a multiple of 16 KiB and protection bits other than CPU read, write and execute are `EINVAL`; an alias or a map asking for more than the descriptor's maximum protection (write and execute counting as read) is `EACCES`, as FreeBSD 11's `vm_map_protect` treats a protection past `max_protection`; a descriptor that is not a JIT object is `EBADF`. The name is ignored, the objects do not count against the flexible memory budget, `mprotect` of a view is not limited to the maximum protection, and `mmap` of the descriptors is unsupported, as for `shm_open`. On Linux the `memfd` is created without `MFD_EXEC`, which Linux 6.3 added and older kernels reject with `EINVAL`, and relies on the protection of the mapping: the flag only sets the file's execute permission bits, and the direct memory `memfd` is mapped executable the same way; a host with `vm.memfd_noexec` set to 2 refuses the creation and the call throws
- [kqueue and kevent](../../../core/libs/prx/libkernel/Equeue/src/Kqueue.cpp) (libkernel) follow FreeBSD 11's [`kern_event.c`](https://github.com/freebsd/freebsd-src/blob/34bd34750187bae02a0086402c78c031c59dd8b3/sys/kern/kern_event.c) (`kqueue_kevent`, `kqueue_register`, `kqueue_scan`, the timer and user filters) over the event queue; nothing is measured on a console. The descriptor is a host null device registered as the kqueue: `close` and `sceKernelClose` close the queue and `dup`/`dup2` of it throw, but `read`, `write` and `fstat` act on the null device instead of failing with `EOPNOTSUPP` or reporting `S_IFIFO`. Read and write events are supported on guest sockets only, plus the timer, user and [vnode](../../../core/libs/prx/libkernel/Equeue/src/FileEvent.cpp) filters; other filters, `EV_DISABLE`, `EV_DISPATCH`, `EV_FORCEONESHOT`, `NOTE_LOWAT`, `EV_CLEAR` on a socket, `EVFILT_READ` on another kqueue, a `NOTE_NSECONDS` period above one second with a fraction (11.0 converts the fraction with the microsecond macro), any change to an existing timer (11.0 keeps the armed expiry and applies the new period after it, 11.4's `filt_timertouch` restarts it) and a negative `nevents` throw. A new user event keeps its `fflags` unmasked and is not triggered by `NOTE_TRIGGER`, because `filt_userattach` reads the already cleared `kn_fflags`. The timer limit `kq_calloutmax` (`ENOMEM`) is not enforced, and closing a kqueue wakes a thread waiting on it in `kevent` with `EBADF`, where `kqueue_drain` makes the close wait for that thread. A level-triggered event is reported once per call and moved behind the other events, as in `kqueue_scan`; the `sceKernel*Equeue` calls keep their own collection loop
- [EVFILT_VNODE, sceKernelAddFileEvent and sceKernelDeleteFileEvent](../../../core/libs/prx/libkernel/Equeue/src/FileEvent.cpp) (libkernel) watch the host file or directory behind the descriptor and turn host changes into FreeBSD 11 vnode hints, which [`filt_vfsvnode`](https://github.com/freebsd/freebsd-src/blob/34bd34750187bae02a0086402c78c031c59dd8b3/sys/kern/vfs_subr.c#L5032) adds whole when they share a bit with the requested `fflags`: a write that grows a file is `NOTE_WRITE | NOTE_EXTEND`, another write `NOTE_WRITE`, a shrinking truncate or an attribute change `NOTE_ATTRIB`, a higher link count `NOTE_LINK`, a lower one or a pending delete `NOTE_DELETE`, a new path `NOTE_RENAME`; in a directory, an entry created, removed or renamed is `NOTE_WRITE`, with `NOTE_LINK` for a subdirectory, and on Linux an entry moved from or to another directory adds `NOTE_EXTEND`; a directory registered with `NOTE_EXTEND` on Windows is accepted, as `vfs_kqfilter` does not check it, but never receives it, because the directory handle cannot tell a move between directories from a removal plus an addition. FreeBSD's hints depend on the filesystem and the console's filesystems are not known: a growing `ftruncate` reports `NOTE_WRITE | NOTE_EXTEND` where `vop_setattr_post` reports `NOTE_ATTRIB`, and on Windows `utimes` on a file reports `NOTE_WRITE`. Windows uses `FindFirstChangeNotification` on the parent directory (and on a watched directory itself) and compares `GetFileInformationByHandleEx` snapshots at least every 50 ms, because a write through an open handle is reported only when the handle is flushed or closed, so file hints can arrive 50 ms late; Linux uses inotify on the file and is not run. `NOTE_REVOKE`, `NOTE_OPEN`, `NOTE_CLOSE`, `NOTE_CLOSE_WRITE`, `NOTE_READ`, unknown bits and descriptors other than files, directories, pipes and sockets throw. `sceKernelAddFileEvent(eq, fd, watch, udata)` and `sceKernelDeleteFileEvent(eq, fd)` take the [OpenOrbis](https://github.com/OpenOrbis/OpenOrbis-PS4-Toolchain/blob/0a1aaf9d/include/orbis/libkernel.h#L35) and [SharpProspero](https://github.com/SvenGDK/SharpProspero/blob/5dfdb4b0/src/SharpProspero/Interop/Kernel/KernelEqueue.cs#L164) signatures; `watch` is taken as the `fflags` and the event is added with `EV_CLEAR`, neither confirmed on a title
- [sem_timedwait](../../../core/libs/prx/libkernel/Pthread/Posix/Sem.cpp) (libkernel) consumes an available count before checking the timeout and waits indefinitely for a null timeout, following FreeBSD 11's `sem_timedwait`. Console behavior for null and invalid timeouts when a count is available is unverified.
- [tcsendbreak, tcdrain, tcflush, tcflow, tcgetpgrp, tcsetpgrp](../../../core/libs/prx/libkernel/File/src/Terminal.cpp) (libkernel) follow FreeBSD 11.4's [`termios.c`](https://github.com/freebsd/freebsd-src/blob/8c639945a44588f6cfdddfb057bb5aad88735da0/lib/libc/gen/termios.c): `tcflush` answers `EINVAL` for a queue other than `TCIFLUSH`, `TCOFLUSH` or `TCIOFLUSH` and `tcflow` for an action outside `TCOOFF`..`TCION` before the descriptor is looked at, and every other call fails as its terminal ioctl does on a descriptor that is not a terminal, with the errors `tcgetattr` gives, so `tcsendbreak` never reaches its 0.4 s pause. FreeBSD's `pipe_ioctl` answers `TIOCGPGRP` and `TIOCSPGRP` on a pipe or FIFO with the descriptor's SIGIO owner, which is not modelled, so `tcgetpgrp` and `tcsetpgrp` throw on a host pipe or FIFO above descriptor 2; descriptors 0 to 2 are taken as non-terminals that are not pipes, whatever the host attaches to them, so a pipe the guest creates on a freed descriptor 0 to 2 gets `ENOTTY` there. The PS5 `libkernel` is assumed to use this FreeBSD code, and `tcdrain` is not a cancellation point here
- [Windows file timestamps](../../../core/libs/prx/libkernel/File/include/WindowsFileTime.hpp) use the host filesystem's timestamp range and resolution. `utimes` and `futimes` reject timestamps outside nonnegative signed 64-bit Windows file-time ticks with `EINVAL`, including exactly 1601-01-01 00:00:00 UTC, whose zero value means "leave unchanged" to `SetFileTime`. Guest directory descriptors still resolve through their recorded path. Filesystems with coarser timestamp resolution cannot retain every guest microsecond