resolved: port to stat_inode_unmodified()

src/resolve/resolved-manager.h

@@ -1,6 +1,8 @@
 /* SPDX-License-Identifier: LGPL-2.1+ */
 #pragma once
 
+#include <sys/stat.h>
+
 #include "sd-event.h"
 #include "sd-netlink.h"
 #include "sd-network.h"
@@ -71,7 +73,7 @@ struct Manager {
         bool need_builtin_fallbacks:1;
 
         bool read_resolv_conf:1;
-        usec_t resolv_conf_mtime;
+        struct stat resolv_conf_stat;
 
         DnsTrustAnchor trust_anchor;
 

src/resolve/resolved-resolv-conf.c

@@ -14,6 +14,7 @@
 #include "resolved-conf.h"
 #include "resolved-dns-server.h"
 #include "resolved-resolv-conf.h"
+#include "stat-util.h"
 #include "string-util.h"
 #include "strv.h"
 #include "tmpfile-util-label.h"
@@ -93,7 +94,7 @@ int manager_read_resolv_conf(Manager *m) {
         }
 
         /* Have we already seen the file? */
-        if (timespec_load(&st.st_mtim) == m->resolv_conf_mtime)
+        if (stat_inode_unmodified(&st, &m->resolv_conf_stat))
                 return 0;
 
         if (file_is_our_own(&st))
@@ -159,7 +160,7 @@ int manager_read_resolv_conf(Manager *m) {
                 log_syntax(NULL, LOG_DEBUG, "/etc/resolv.conf", n, 0, "Ignoring resolv.conf line: %s", l);
         }
 
-        m->resolv_conf_mtime = timespec_load(&st.st_mtim);
+        m->resolv_conf_stat = st;
 
         /* Flush out all servers and search domains that are still
          * marked. Those are then ones that didn't appear in the new