diff options
| author | GenericRikka <rikka.goering@outlook.de> | 2026-04-20 23:32:49 +0000 |
|---|---|---|
| committer | Konstantin Belousov <kib@FreeBSD.org> | 2026-04-21 23:36:07 +0000 |
| commit | 0f89380a3d208d67698f2d35afd35257e5fdbe09 (patch) | |
| tree | 3cc739d6314e72b20b85617168c97eb24463c1cb /lib/libkvm | |
| parent | 5c89d661a023c83a2001cf5b354b09c7d3ac91d8 (diff) | |
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
Diffstat (limited to 'lib/libkvm')
| -rw-r--r-- | lib/libkvm/kvm_proc.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/lib/libkvm/kvm_proc.c b/lib/libkvm/kvm_proc.c index fed483978e62..a952888c9ef0 100644 --- a/lib/libkvm/kvm_proc.c +++ b/lib/libkvm/kvm_proc.c @@ -121,6 +121,7 @@ kvm_proclist(kvm_t *kd, int what, int arg, struct proc *p, struct thread mtd; struct proc proc; struct proc pproc; + struct proc rproc; struct sysentvec sysent; char svname[KI_EMULNAMELEN]; struct thread *td = NULL; @@ -365,6 +366,13 @@ nopgrp: kp->ki_xstat = KW_EXITCODE(proc.p_xexit, proc.p_xsig); kp->ki_acflag = proc.p_acflag; kp->ki_lock = proc.p_lock; + if (KREAD(kd, (u_long)proc.p_reaper, &rproc)) { + _kvm_err(kd, kd->program, + "can't read reaper at %p", proc.p_reaper); + return (-1); + } + kp->ki_reaper = rproc.p_pid; + kp->ki_reapsubtree = proc.p_reapsubtree; kp->ki_tdev_freebsd11 = kp->ki_tdev; /* truncate */ /* Per-thread items; iterate as appropriate. */ |