[xXPBSXx]

What

The guest queue of pending signals kept only a bit per signal, and FillSiginfo always wrote si_code 0 (and the caller's pid). FreeBSD 11.4 stamps the signal with the sender: kill with SI_USER (0x10001, sys/kern/kern_sig.c:1788), thr_kill (so raise and pthread_kill) with SI_LWP (0x10007, kern_thr.c:401, lib/libc/gen/raise.c:52), and the interval-timer expiry with SI_KERNEL (0x10006) and pid 0 (kern_time.c:899, kern_sig.c:2087). Each pending signal now stores its code when it is marked, and sigwaitinfo/sigtimedwait return it. The expectations in guest_sigtimedwait that pinned 0 change accordingly.
Fixes #8496
The expectations of guest_sigtimedwait that #4138 set to 0 change here; #4138 took the siginfo_t layout from FreeBSD 11 and did not measure si_code on a console, as far as its description says. Overlap: #7192 (open) touches Signals.cpp and the siginfo fill; git merge-tree is clean for it and for #8407, #8411, #8414 and #8467, and has conflicts with #3986 (3), #6044 (26) and #7201 (25). pr_overlap was not run.

Tested

Windows 10 (19045), MinGW-w64 GCC 15.2.0, Release, on upstream/main cabd80f + this commit:

• guest_sigtimedwait: Exit code 0xc0000409 with System/src/Signals.cpp taken back to main (new expectations kept), passes with the change (3 of 3 runs). Cases: raise and pthread_kill from another thread give si_code 0x10007; kill(getpid(), SIGINT) gives 0x10001 with the caller's pid; a blocked SIGALRM from alarm(1) gives 0x10006 and pid 0.
• guest_signals, guest_itimer, guest_itimer_pending_default, guest_kill, guest_signal_sets, guest_sigaltstack, guest_getitimer pass.
• python tools/check_conventions.py --base upstream/main: passes.
• Not tested: Linux (shared code, not built there), a console (values come from the FreeBSD source, not measured), a title run; no title is known to read si_code. Signals that arrive asynchronously from the host keep SI_LWP.

Checklist

• Based on current main; no other open PR implements the same functions
• One topic per PR; follow-ups go in a new PR
• No comments in code except technical debt
• Unimplemented paths throw; no silent stubs added
• No notes, investigation .md files or images added to the repository
• New third-party code is a submodule built from source (none added)
• Generic behaviour, not specific to one title
• Depends on: none
• Unblocks: none
• AI-assisted: yes

AI-assisted (Claude Code).

🤖 Generated with Claude Code

[github-actions]

Some comparisons could not be completed because a pull request conflicts with the base branch. Review these shared files manually before concluding that there is no overlap.

Pull request	Shared files not compared
PR 3986	core/libs/prx/libkernel/System/src/Signals.cpp
PR 6044	core/libs/tests/GuestSigtimedwait.cpp
PR 7201	core/libs/prx/libkernel/System/src/Signals.cpp
PR 7622	core/libs/prx/libkernel/System/src/Signals.cpp