[Bug 293871] kern/proc: expose reaper PID and subtree root in struct kinfo_proc

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=293871

--- Comment #10 from commit-hook@FreeBSD.org ---
A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=0f89380a3d208d67698f2d35afd35257e5fdbe09

commit 0f89380a3d208d67698f2d35afd35257e5fdbe09
Author:     GenericRikka <rikka.goering@outlook.de>
AuthorDate: 2026-04-20 23:32:49 +0000
Commit:     Konstantin Belousov <kib@FreeBSD.org>
CommitDate: 2026-04-21 23:36:07 +0000

    kern/proc: expose reaper PID and subtree root in struct kinfo_proc

    Expose process reaper metadata through struct kinfo_proc so userland
    can reconstruct reaper hierarchies from kern.proc.all without adding
    a new procctl(2) operation.

    Two pid_t fields are added by carving 8 bytes from ki_sparestrings
    (46 -> 38), restoring KI_NSPARE_INT to 2 and keeping sizeof(struct
    kinfo_proc) unchanged:

      ki_reaper: PID of the owning reaper process
      ki_reapsubtree: PID of the direct child of the reaper that roots
                      the subtree the process belongs to

    fill_kinfo_proc_pgrp() populates both fields under proctree_lock.
    kvm_proclist() is updated for crash dump consumers. The freebsd32
    compat struct and freebsd32_kinfo_proc_out() are updated accordingly.

    PR:     293871
    Reviewed by:    kib
    MFC after:      1 week
    Differential revision:  https://reviews.freebsd.org/D56538

 lib/libkvm/kvm_proc.c            | 8 ++++++++
 sys/compat/freebsd32/freebsd32.h | 4 +++-
 sys/kern/kern_proc.c             | 4 ++++
 sys/sys/user.h                   | 4 +++-
 4 files changed, 18 insertions(+), 2 deletions(-)

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