#include <stdio.h>
#include <stdlib.h>
#include <systemd/sd-journal.h>

int main(void) {
    sd_journal *j;
    int ret;

    sd_journal_open(&j, SD_JOURNAL_LOCAL_ONLY);
    sd_journal_seek_tail(j);
    //sd_journal_previous(j);

    for (;;) {
        sd_journal_wait(j, (uint64_t) -1);
        while (sd_journal_next(j) > 0) {
            const char *d;
            size_t l;

            if (sd_journal_get_data(j, "MESSAGE", (const void **)&d, &l) >= 0) {
                printf("%.*s\n", (int)l, d);
            }
        }
    }

    sd_journal_close(j);

    return 0;
}