`getpeername()` is currently handled in ntdll. This merge request changes ntdll to forward `getpeername()` to wineserver. The implementation utilises new `peer_addr` and `peer_addr_len` fields in wineserver's `struct sock`.
This fixes multiple `todo_wine`s in `ws2_32/tests` and allows for more accurate peer names to be provided in case the address the socket is bound to on the Unix side does not match what `bind()` was called with on the Windows side.
*This merge request was originally intended to be included in !2786 (Add support for AF_UNIX sockets) but was split into its own merge request because this is not an insignificant change.*
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v3: ws2_32/tests: Remove todo_wine from now-successful tests.
https://gitlab.winehq.org/wine/wine/-/merge_requests/3074
Valgrind support requires a fork, which I've published to https://gitlab.winehq.org/rbernon/valgrind. The fork implements loading DWARF debug info from PE files, instead of the old and broken upstream PDB support. I've tried to upstream these changes a long time ago but didn't receive any feedback.
I think we could maybe consider keeping a fork, which I'm happy to maintain, as the changes aren't too large. We may want to investigate adding 32-on-64 support, which may require a bit more changes (to VEX specifically, because its amd64 guest doesn't support segment register manipulation).
The changes here are not all related to Valgrind, and I'll create separate MR for those which may make sense independently from Valgrind / GDB.
Also included is a suppression file to silent some annoying false positives, many of which are coming from the cross-stack accesses during syscalls, which are confusing Valgrind's stack heuristics. One can try this out with something like:
`WINELOADERNOEXEC=1 valgrind --suppressions=tools/valgrind.supp wine64/loader/wine64 wine64/programs/winecfg/winecfg.exe`
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v9: ntdll: Avoid writing to invalid memory in i386 unix dispatcher.
ntdll: Fix incorrect i386 call_user_mode_callback CFI.
ntdll: Avoid marking freed block header as undefined for valgrind.
ntdll: Force HEAP_TAIL_CHECKING_ENABLED flag with valgrind.
ntdll: Fix valgrind notifications from ntdll.so.
ntdll: Import valgrind headers for PE side ntdll.
ntdll: Maintain a PE module link map and expose it to GDB.
ntdll: Pass a UNICODE_STRING to load_builtin and virtual_map_image.
loader: Expose a shadow copy of ld.so link map to GDB.
ntdll: Add .cfi_signal_frame to __wine_syscall_dispatcher.
https://gitlab.winehq.org/wine/wine/-/merge_requests/1074