core: Added support for ERRNO NOTIFY_SOCKET message parsing, and added StatusErrno dbus property along StatusText to allow notification of numeric status condition while degraded service operation or any other special situation.

3 files changed, 19 insertions, 0 deletions

diff --git a/src/core/dbus-service.c b/src/core/dbus-service.c
index 093289fdf6..5a881e8249 100644
--- a/src/core/dbus-service.c
+++ b/src/core/dbus-service.c
@@ -60,6 +60,7 @@ const sd_bus_vtable bus_service_vtable[] = {
         SD_BUS_PROPERTY("ControlPID", "u", bus_property_get_pid, offsetof(Service, control_pid), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
         SD_BUS_PROPERTY("BusName", "s", NULL, offsetof(Service, bus_name), SD_BUS_VTABLE_PROPERTY_CONST),
         SD_BUS_PROPERTY("StatusText", "s", NULL, offsetof(Service, status_text), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
+        SD_BUS_PROPERTY("StatusErrno", "i", NULL, offsetof(Service, status_errno), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
         SD_BUS_PROPERTY("Result", "s", property_get_result, offsetof(Service, result), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
         BUS_EXEC_STATUS_VTABLE("ExecMain", offsetof(Service, main_exec_status), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
         BUS_EXEC_COMMAND_LIST_VTABLE("ExecStartPre", offsetof(Service, exec_command[SERVICE_EXEC_START_PRE]), SD_BUS_VTABLE_PROPERTY_EMITS_INVALIDATION),
diff --git a/src/core/service.c b/src/core/service.c
index 0b19767d9e..ace45e29ec 100644
--- a/src/core/service.c
+++ b/src/core/service.c
@@ -2637,6 +2637,23 @@ static void service_notify_message(Unit *u, pid_t pid, char **tags) {
                         free(t);
         }
 
+        /* Interpret ERRNO= */
+        e = strv_find_prefix(tags, "ERRNO=");
+        if (e) {
+                int status_errno;
+
+                if (safe_atoi(e + 6, &status_errno) < 0)
+                        log_warning_unit(u->id, "Failed to parse ERRNO= field in notification message: %s", e);
+                else {
+                        log_debug_unit(u->id, "%s: got %s", u->id, e);
+
+                        if (s->status_errno != status_errno) {
+                                s->status_errno = status_errno;
+                                notify_dbus = true;
+                        }
+                }
+        }
+
         /* Interpret WATCHDOG= */
         if (strv_find(tags, "WATCHDOG=1")) {
                 log_debug_unit(u->id, "%s: got WATCHDOG=1", u->id);
diff --git a/src/core/service.h b/src/core/service.h
index 7406d90f59..686cf4b0bd 100644
--- a/src/core/service.h
+++ b/src/core/service.h
@@ -182,6 +182,7 @@ struct Service {
         char *bus_name;
 
         char *status_text;
+        int status_errno;
 
         FailureAction failure_action;