# DF-4749 baseline (PRE-FIX nmdm.ko) evidence — DragonFly 6.5-DEVELOPMENT x86_64 guest
# /dev/nmdm0A,B created by `kldload nmdm` -> nmdminit() -> make_dev(...,0666) (nmdm.c:127-130)

## Part A — unprivileged UNJAILED baseline (uid 1001 maxx):
uid=1001(maxx) gid=1001(maxx) groups=1001(maxx)
== DF-4749: reopen of an open nmdm half ==
open#1(/dev/nmdm0A)          = 3  [ok, TS_ISOPEN set]
open#2(/dev/nmdm0A)          = 4  [correct: reopen allowed]
open#3 after close(#1)       = 3  [ok: fresh first-open works]
    => for unjailed users the prison check (nmdm.c:211) is INERT:
       pt_prison==NULL == cr_prison==NULL (kern_prot.c:1223) -> never EBUSY.

## Part B — jailed holder + same-jail reopen (rigorous, pre-fix):
== starting jailed holder on /dev/nmdm0A ==
holder: open(/dev/nmdm0A)=3 holding 60s
== jailed process reopens own jail half:
== DF-4749: reopen of an open nmdm half ==
FAIL setup: open#1(/dev/nmdm0A): Device busy
    => BUG direction 1: pt_prison(NULL) != cr_prison(&jail) ALWAYS true for
       jailed openers (nmdm.c:211) — a jail cannot even reopen its own half.

== jail pid check: holder alive? ==
1278 /tmp/holder /dev/nmdm0A
holder: open(/dev/nmdm0A)=3 holding 60s

== unprivileged UNJAILED attach while jail holds the half (user maxx) ==
holder: open(/dev/nmdm0A)=3 holding 60s
    => BUG direction 2: intended prison affinity never fires for the
       unjailed side — unprivileged host user shares the jail's tty half.