bus: parse and expose kdbus message timestamps

src/libsystemd-bus/bus-kernel.c

@@ -225,6 +225,7 @@ static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k, sd_bus_mess
         struct bus_header *h = NULL;
         size_t total, n_bytes = 0, idx = 0;
         struct kdbus_creds *creds = NULL;
+        uint64_t nsec = 0;
         int r;
 
         assert(bus);
@@ -266,6 +267,8 @@ static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k, sd_bus_mess
 
                 } else if (d->type == KDBUS_MSG_SRC_CREDS)
                         creds = &d->creds;
+                else if (d->type == KDBUS_MSG_TIMESTAMP)
+                        nsec = d->ts_ns;
         }
 
         if (!h)
@@ -313,6 +316,8 @@ static int bus_kernel_make_message(sd_bus *bus, struct kdbus_msg *k, sd_bus_mess
                 m->uid_valid = m->gid_valid = true;
         }
 
+        m->timestamp = nsec / NSEC_PER_USEC;
+
         r = bus_message_parse_fields(m);
         if (r < 0) {
                 sd_bus_message_unref(m);

src/libsystemd-bus/bus-message.c

@@ -709,6 +709,17 @@ const char *sd_bus_message_get_label(sd_bus_message *m) {
         return m->label;
 }
 
+int sd_bus_message_get_timestamp(sd_bus_message *m, uint64_t *usec) {
+        if (!m)
+                return -EINVAL;
+
+        if (m->timestamp <= 0)
+                return -ENOENT;
+
+        *usec = m->timestamp;
+        return 0;
+}
+
 int sd_bus_message_is_signal(sd_bus_message *m, const char *interface, const char *member) {
         if (!m)
                 return -EINVAL;
@@ -2922,6 +2933,8 @@ int bus_message_dump(sd_bus_message *m) {
                 printf("\tgid=%lu\n", (unsigned long) m->gid);
         if (m->pid_starttime != 0)
                 printf("\tpid_starttime=%llu\n", (unsigned long long) m->pid_starttime);
+        if (m->timestamp)
+                printf("\ttimestamp=%llu\n", (unsigned long long) m->timestamp);
 
         r = sd_bus_message_rewind(m, true);
         if (r < 0) {

src/libsystemd-bus/bus-message.h

@@ -68,6 +68,7 @@ struct sd_bus_message {
         pid_t pid;
         pid_t tid;
         usec_t pid_starttime;
+        usec_t timestamp;
 
         bool sealed:1;
         bool dont_send:1;

src/systemd/sd-bus.h

@@ -127,6 +127,7 @@ int sd_bus_message_get_pid(sd_bus_message *m, pid_t *pid);
 int sd_bus_message_get_tid(sd_bus_message *m, pid_t *tid);
 int sd_bus_message_get_pid_starttime(sd_bus_message *m, uint64_t *usec);
 const char *sd_bus_message_get_label(sd_bus_message *m);
+int sd_bus_message_get_timestamp(sd_bus_message *m, uint64_t *usec);
 
 int sd_bus_message_is_signal(sd_bus_message *m, const char *interface, const char *member);
 int sd_bus_message_is_method_call(sd_bus_message *m, const char *interface, const char *member);