[MarcZX10]

What

Carries the getpriority implementation from #3632, preserving the original commit author. For the single guest process, it follows FreeBSD 11.4: PRIO_PROCESS and PRIO_PGRP for id 0 or the current pid, and PRIO_USER for id 0 or the guest uid, return nice 0. Unknown which returns EINVAL; other ids return ESRCH. Successful calls leave guest errno unchanged. The console nice value remains unmeasured and is documented in docs/dev/debt/libkernel.md.

PPSA99420 reaches this import after chflags is resolved by #4379 (issue #1578). This PR covers only getpriority; the other exports from #3632 remain separate work.

Tested

• Before this current-main rebase, Linux GCC 12.2 Release built guest_sched_priority_tests; CTest passed 1/1, and conventions and diff checks passed.
• The current-main rebase has not been built or tested locally. CI/reviewer validation should rerun against this head.

Checklist

• Based on current main; no other open PR implements the same function
• One topic: getpriority
• No comments in code except technical debt
• No notes or investigation files added
• Generic behavior, not title-specific
• Depends on: feat(libkernel): carry chflags implementation #4379
• Unblocks: PPSA99420 Four open-source homebrew titles stop at start-up on unresolved imports (sysctl, pthread_set_name_np, isatty, mkstemp, signal sets, Opus decoders) #1578, after feat(libkernel): carry chflags implementation #4379
• AI-assisted: yes; original implementation author preserved

[github-actions]

Progress report (8d98e88 → 1ba0a81)

📈 System libraries: 88.17% (+0.01%, +1 implemented functions)

✅ 1 implemented

Library	Name
libkernel	getpriority_nid_postfix

[xXPBSXx]

Windows test: head 46614e273 merged onto current main 3d8ffeb27 (clean merge, no conflicts). Windows 10, MinGW GCC (WinLibs), Ninja Release, -j4: full build 0 errors; ctest with the filter guest_sched_priority: guest_sched_priority passed (1 test(s), 0 failed); python tools/check_conventions.py --base upstream/main passed. I did not run the new tests against main without the change.

AI-assisted (Claude Code).

[blawesom]

Rebase handoff — rebased onto current main, authorship unchanged.

One conflict in Process.cpp: both sides add constants at the same spot — kept main's rlimit constants and this PR's priority/nice constants together. TechnicalDebt.md unioned.

Verified on Linux (CachyOS, kernel 7.2.9, GCC 16.2.1, Ninja, Release, BUILD_TESTING=ON, AMD RX 9070 XT / RADV):

• builds; tools/check_conventions.py --base origin/main passes
• full suite: 955/955 passed

To pick it up:

git fetch https://github.com/blawesom/AnyPS5 rebase/4374
git checkout <your branch>
git merge --ff-only FETCH_HEAD

Head is de2677b43.

[screamm]

Windows validation with title evidence (Windows 11 Pro 26220, WinLibs MinGW-w64 GCC 15.2.0 r7, Ninja, Release, BUILD_TESTING=ON, full build including libs; base main 2a2a3dc6): 66cd9382 merges cleanly and builds without warnings in the touched files; guest_sched_priority 3/3; suite 688/689, the only failure being patched_libraries, broken on main until #5025; conventions and git diff --check pass. PS5MC (PPSA99420) alone still stops earlier at chflags (ixrw0h2tWuI, #4379); stacked on #4379 it moves from FAIL: unresolved ELF import miQ1wVwSexE from libkernel.prx to FAIL: unresolved ELF import hpoDTzy9Yy0 from libkernel.prx (sigpending, #4383). The only overlap with #4379 is both appending a bullet to docs/dev/debt/libkernel.md.

[p3n1cillin]

Title run with this PR: Windows 11, MinGW GCC 15.2.0 (WinLibs), Release. Built on main 3faa9cb40 merged with this PR and the other open PRs that the catalog titles below need (#4377, #4379, #4374, #4383, #3798, #4863, #4105, my #5013/#5061/#5078/#5098/#5009 and the carries #5183/#5186, plus screamm's chroot branch from #3632); every title converted from its catalog release, eboot.bin kept in app0, 60 s runs.

• PS5MC (PPSA99420): with this PR, feat(libkernel): carry chflags implementation #4379, feat(libkernel): implement sigpending #4383 and feat(libkernel): add clock_settime with FreeBSD argument checks #5183 it loads (no absent imports) and, with feat(libkernel): report vm.overcommit through sysctlbyname #5184/feat(libkernel): report _SC_CLK_TCK through sysconf #5185/fix(libkernel): handle FIOCLEX and FIONCLEX in ioctl #5186, Kodi reaches its GUI and runs 90 s. This PR's getpriority conflicts textually with feat(libkernel): add getdtablesize #5061's getdtablesize in Process.cpp and docs/dev/debt/libkernel.md (both add a function after getrlimit); keeping both is enough.

AI-assisted (Claude Code).

[github-actions]

Other open pull requests touch the same code. Merging one will break the other, or both implement the same thing. If this one builds on them, list them in Depends on.

Pull request	Conflicting files (lines on main)	Same exports	Same new files
#5061	core/libs/prx/libkernel/System/src/Process.cpp L550

[oneandonlydean]

Rebased onto main after #4379 and pushed here, author kept. The only conflict was docs/dev/debt/libkernel.md, where both entries are kept (chflags from #4379, getpriority from this PR). Merging on a green full build.