From 78ef66354cd4f24c157f7688e519597a69ceff99 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Thu, 25 Apr 2024 12:44:00 +0200
Subject: [PATCH] varlink: fix varlink_get_peer_pidref() fallback

let's properly handle old kernels that have no pidfd, and use regular
pids in that case, as intended originally.
---
 src/shared/varlink.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/shared/varlink.c b/src/shared/varlink.c
index f1c00a21b61..d96967b8e6a 100644
--- a/src/shared/varlink.c
+++ b/src/shared/varlink.c
@@ -2871,7 +2871,7 @@ int varlink_get_peer_pidref(Varlink *v, PidRef *ret) {
          * authentication. */
 
         r = varlink_acquire_pidfd(v);
-        if (r < 0)
+        if (r < 0 && !ERRNO_IS_NEG_NOT_SUPPORTED(r))
                 return r;
 
         if (v->peer_pidfd < 0) {
-- 
2.47.3