From b42c441ee0c41d493dbf154713c69855cc2f74f5 Mon Sep 17 00:00:00 2001
From: Benny Baumann <BenBE@geshi.org>
Date: Sun, 15 Aug 2021 10:15:16 +0200
Subject: [PATCH] Use proper metric to detect kernel threads

Querying kernel threads with `ps -o pid,lid,flags,state,lname -sp 0`
gives that kernel threads have state `K` and flags have mask `0x20000` set.
This corresponds to `LW_SYSTEM` in kernel which is mapped as `L_SYSTEM`/`P_SYSTEM` for userspace.
---
 netbsd/NetBSDProcessList.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/netbsd/NetBSDProcessList.c b/netbsd/NetBSDProcessList.c
index 3d3ba294..73c4f0f7 100644
--- a/netbsd/NetBSDProcessList.c
+++ b/netbsd/NetBSDProcessList.c
@@ -281,7 +281,7 @@ static void NetBSDProcessList_scanProcs(NetBSDProcessList* this) {
          proc->session = kproc->p_sid;
          proc->tty_nr = kproc->p_tdev;
          proc->pgrp = kproc->p__pgid;
-         proc->isKernelThread = proc->pgrp == 0;
+         proc->isKernelThread = !!(kproc->p_flag & P_SYSTEM);
          proc->isUserlandThread = proc->pid != proc->tgid;
          proc->starttime_ctime = kproc->p_ustart_sec;
          Process_fillStarttimeBuffer(proc);