networkd: move event loop handling out of the manager (#4723)

This will allow us to have several managers sharing an event loop
and running in parallel, as if they were running in separate processes.

The long term-aim is to allow networkd to be split into separate
processes, so restructure the code to make this simpler.

For now we drop the exit-on-idle logic, as this was anyway severely
restricted at the moment. Once split, we will revisit this as it may
then make more sense again.

1 files changed, 20 insertions, 3 deletions

diff --git a/src/network/networkd.c b/src/network/networkd.c
index 2851432eff..fe60f1ed14 100644
--- a/src/network/networkd.c
+++ b/src/network/networkd.c
@@ -18,6 +18,7 @@
 ***/
 
 #include "sd-daemon.h"
+#include "sd-event.h"
 
 #include "capability-util.h"
 #include "networkd-conf.h"
@@ -26,6 +27,7 @@
 #include "user-util.h"
 
 int main(int argc, char *argv[]) {
+        sd_event *event = NULL;
         _cleanup_manager_free_ Manager *m = NULL;
         const char *user = "systemd-network";
         uid_t uid;
@@ -78,7 +80,15 @@ int main(int argc, char *argv[]) {
 
         assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, -1) >= 0);
 
-        r = manager_new(&m);
+        r = sd_event_default(&event);
+        if (r < 0)
+                goto out;
+
+        sd_event_set_watchdog(event, true);
+        sd_event_add_signal(event, NULL, SIGTERM, NULL, NULL);
+        sd_event_add_signal(event, NULL, SIGINT, NULL, NULL);
+
+        r = manager_new(&m, event);
         if (r < 0) {
                 log_error_errno(r, "Could not create manager: %m");
                 goto out;
@@ -118,22 +128,29 @@ int main(int argc, char *argv[]) {
                 goto out;
         }
 
+        r = manager_start(m);
+        if (r < 0) {
+                log_error_errno(r, "Could not start manager: %m");
+                goto out;
+        }
+
         log_info("Enumeration completed");
 
         sd_notify(false,
                   "READY=1\n"
                   "STATUS=Processing requests...");
 
-        r = manager_run(m);
+        r = sd_event_loop(event);
         if (r < 0) {
                 log_error_errno(r, "Event loop failed: %m");
                 goto out;
         }
-
 out:
         sd_notify(false,
                   "STOPPING=1\n"
                   "STATUS=Shutting down...");
 
+        sd_event_unref(event);
+
         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 }