+int sd_journal_process(sd_journal *j);
+
+#define SD_JOURNAL_FOREACH(j) \
+ if (sd_journal_seek_head(j) >= 0) \
+ while (sd_journal_next(j) > 0)
+
+#define SD_JOURNAL_FOREACH_BACKWARDS(j) \
+ if (sd_journal_seek_tail(j) >= 0) \
+ while (sd_journal_previous(j) > 0)
+
+#define SD_JOURNAL_FOREACH_DATA(j, data, l) \
+ for (sd_journal_restart_data(j); sd_journal_enumerate_data((j), &(data), &(l)) > 0; )
+
+#define SD_JOURNAL_FOREACH_UNIQUE(j, data, l) \
+ for (sd_journal_restart_unique(j); sd_journal_enumerate_data((j), &(data), &(l)) > 0; )