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diff --git a/src/grp-journal/libjournal-core/test-journal-interleaving.c b/src/grp-journal/libjournal-core/test-journal-interleaving.c
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+/***
+ This file is part of systemd.
+
+ Copyright 2013 Marius Vollmer
+ Copyright 2013 Zbigniew Jędrzejewski-Szmek
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <fcntl.h>
+#include <unistd.h>
+
+#include <systemd/sd-journal.h>
+
+#include "alloc-util.h"
+#include "journal-file.h"
+#include "journal-vacuum.h"
+#include "log.h"
+#include "parse-util.h"
+#include "rm-rf.h"
+#include "util.h"
+
+/* This program tests skipping around in a multi-file journal.
+ */
+
+static bool arg_keep = false;
+
+noreturn static void log_assert_errno(const char *text, int eno, const char *file, int line, const char *func) {
+ log_internal(LOG_CRIT, 0, file, line, func,
+ "'%s' failed at %s:%u (%s): %s.",
+ text, file, line, func, strerror(eno));
+ abort();
+}
+
+#define assert_ret(expr) \
+ do { \
+ int _r_ = (expr); \
+ if (_unlikely_(_r_ < 0)) \
+ log_assert_errno(#expr, -_r_, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
+ } while (false)
+
+static JournalFile *test_open(const char *name) {
+ JournalFile *f;
+ assert_ret(journal_file_open(-1, name, O_RDWR|O_CREAT, 0644, true, false, NULL, NULL, NULL, NULL, &f));
+ return f;
+}
+
+static void test_close(JournalFile *f) {
+ (void) journal_file_close (f);
+}
+
+static void append_number(JournalFile *f, int n, uint64_t *seqnum) {
+ char *p;
+ dual_timestamp ts;
+ static dual_timestamp previous_ts = {};
+ struct iovec iovec[1];
+
+ dual_timestamp_get(&ts);
+
+ if (ts.monotonic <= previous_ts.monotonic)
+ ts.monotonic = previous_ts.monotonic + 1;
+
+ if (ts.realtime <= previous_ts.realtime)
+ ts.realtime = previous_ts.realtime + 1;
+
+ previous_ts = ts;
+
+ assert_se(asprintf(&p, "NUMBER=%d", n) >= 0);
+ iovec[0].iov_base = p;
+ iovec[0].iov_len = strlen(p);
+ assert_ret(journal_file_append_entry(f, &ts, iovec, 1, seqnum, NULL, NULL));
+ free(p);
+}
+
+static void test_check_number (sd_journal *j, int n) {
+ const void *d;
+ _cleanup_free_ char *k;
+ size_t l;
+ int x;
+
+ assert_ret(sd_journal_get_data(j, "NUMBER", &d, &l));
+ assert_se(k = strndup(d, l));
+ printf("%s\n", k);
+
+ assert_se(safe_atoi(k + 7, &x) >= 0);
+ assert_se(n == x);
+}
+
+static void test_check_numbers_down (sd_journal *j, int count) {
+ int i;
+
+ for (i = 1; i <= count; i++) {
+ int r;
+ test_check_number(j, i);
+ assert_ret(r = sd_journal_next(j));
+ if (i == count)
+ assert_se(r == 0);
+ else
+ assert_se(r == 1);
+ }
+
+}
+
+static void test_check_numbers_up (sd_journal *j, int count) {
+ for (int i = count; i >= 1; i--) {
+ int r;
+ test_check_number(j, i);
+ assert_ret(r = sd_journal_previous(j));
+ if (i == 1)
+ assert_se(r == 0);
+ else
+ assert_se(r == 1);
+ }
+
+}
+
+static void setup_sequential(void) {
+ JournalFile *one, *two;
+ one = test_open("one.journal");
+ two = test_open("two.journal");
+ append_number(one, 1, NULL);
+ append_number(one, 2, NULL);
+ append_number(two, 3, NULL);
+ append_number(two, 4, NULL);
+ test_close(one);
+ test_close(two);
+}
+
+static void setup_interleaved(void) {
+ JournalFile *one, *two;
+ one = test_open("one.journal");
+ two = test_open("two.journal");
+ append_number(one, 1, NULL);
+ append_number(two, 2, NULL);
+ append_number(one, 3, NULL);
+ append_number(two, 4, NULL);
+ test_close(one);
+ test_close(two);
+}
+
+static void test_skip(void (*setup)(void)) {
+ char t[] = "/tmp/journal-skip-XXXXXX";
+ sd_journal *j;
+ int r;
+
+ assert_se(mkdtemp(t));
+ assert_se(chdir(t) >= 0);
+
+ setup();
+
+ /* Seek to head, iterate down.
+ */
+ assert_ret(sd_journal_open_directory(&j, t, 0));
+ assert_ret(sd_journal_seek_head(j));
+ assert_ret(sd_journal_next(j));
+ test_check_numbers_down(j, 4);
+ sd_journal_close(j);
+
+ /* Seek to tail, iterate up.
+ */
+ assert_ret(sd_journal_open_directory(&j, t, 0));
+ assert_ret(sd_journal_seek_tail(j));
+ assert_ret(sd_journal_previous(j));
+ test_check_numbers_up(j, 4);
+ sd_journal_close(j);
+
+ /* Seek to tail, skip to head, iterate down.
+ */
+ assert_ret(sd_journal_open_directory(&j, t, 0));
+ assert_ret(sd_journal_seek_tail(j));
+ assert_ret(r = sd_journal_previous_skip(j, 4));
+ assert_se(r == 4);
+ test_check_numbers_down(j, 4);
+ sd_journal_close(j);
+
+ /* Seek to head, skip to tail, iterate up.
+ */
+ assert_ret(sd_journal_open_directory(&j, t, 0));
+ assert_ret(sd_journal_seek_head(j));
+ assert_ret(r = sd_journal_next_skip(j, 4));
+ assert_se(r == 4);
+ test_check_numbers_up(j, 4);
+ sd_journal_close(j);
+
+ log_info("Done...");
+
+ if (arg_keep)
+ log_info("Not removing %s", t);
+ else {
+ journal_directory_vacuum(".", 3000000, 0, 0, NULL, true);
+
+ assert_se(rm_rf(t, REMOVE_ROOT|REMOVE_PHYSICAL) >= 0);
+ }
+
+ puts("------------------------------------------------------------");
+}
+
+static void test_sequence_numbers(void) {
+
+ char t[] = "/tmp/journal-seq-XXXXXX";
+ JournalFile *one, *two;
+ uint64_t seqnum = 0;
+ sd_id128_t seqnum_id;
+
+ assert_se(mkdtemp(t));
+ assert_se(chdir(t) >= 0);
+
+ assert_se(journal_file_open(-1, "one.journal", O_RDWR|O_CREAT, 0644,
+ true, false, NULL, NULL, NULL, NULL, &one) == 0);
+
+ append_number(one, 1, &seqnum);
+ printf("seqnum=%"PRIu64"\n", seqnum);
+ assert_se(seqnum == 1);
+ append_number(one, 2, &seqnum);
+ printf("seqnum=%"PRIu64"\n", seqnum);
+ assert_se(seqnum == 2);
+
+ assert_se(one->header->state == STATE_ONLINE);
+ assert_se(!sd_id128_equal(one->header->file_id, one->header->machine_id));
+ assert_se(!sd_id128_equal(one->header->file_id, one->header->boot_id));
+ assert_se(sd_id128_equal(one->header->file_id, one->header->seqnum_id));
+
+ memcpy(&seqnum_id, &one->header->seqnum_id, sizeof(sd_id128_t));
+
+ assert_se(journal_file_open(-1, "two.journal", O_RDWR|O_CREAT, 0644,
+ true, false, NULL, NULL, NULL, one, &two) == 0);
+
+ assert_se(two->header->state == STATE_ONLINE);
+ assert_se(!sd_id128_equal(two->header->file_id, one->header->file_id));
+ assert_se(sd_id128_equal(one->header->machine_id, one->header->machine_id));
+ assert_se(sd_id128_equal(one->header->boot_id, one->header->boot_id));
+ assert_se(sd_id128_equal(one->header->seqnum_id, one->header->seqnum_id));
+
+ append_number(two, 3, &seqnum);
+ printf("seqnum=%"PRIu64"\n", seqnum);
+ assert_se(seqnum == 3);
+ append_number(two, 4, &seqnum);
+ printf("seqnum=%"PRIu64"\n", seqnum);
+ assert_se(seqnum == 4);
+
+ test_close(two);
+
+ append_number(one, 5, &seqnum);
+ printf("seqnum=%"PRIu64"\n", seqnum);
+ assert_se(seqnum == 5);
+
+ append_number(one, 6, &seqnum);
+ printf("seqnum=%"PRIu64"\n", seqnum);
+ assert_se(seqnum == 6);
+
+ test_close(one);
+
+ /* restart server */
+ seqnum = 0;
+
+ assert_se(journal_file_open(-1, "two.journal", O_RDWR, 0,
+ true, false, NULL, NULL, NULL, NULL, &two) == 0);
+
+ assert_se(sd_id128_equal(two->header->seqnum_id, seqnum_id));
+
+ append_number(two, 7, &seqnum);
+ printf("seqnum=%"PRIu64"\n", seqnum);
+ assert_se(seqnum == 5);
+
+ /* So..., here we have the same seqnum in two files with the
+ * same seqnum_id. */
+
+ test_close(two);
+
+ log_info("Done...");
+
+ if (arg_keep)
+ log_info("Not removing %s", t);
+ else {
+ journal_directory_vacuum(".", 3000000, 0, 0, NULL, true);
+
+ assert_se(rm_rf(t, REMOVE_ROOT|REMOVE_PHYSICAL) >= 0);
+ }
+}
+
+int main(int argc, char *argv[]) {
+ log_set_max_level(LOG_DEBUG);
+
+ /* journal_file_open requires a valid machine id */
+ if (access("/etc/machine-id", F_OK) != 0)
+ return EXIT_TEST_SKIP;
+
+ arg_keep = argc > 1;
+
+ test_skip(setup_sequential);
+ test_skip(setup_interleaved);
+
+ test_sequence_numbers();
+
+ return 0;
+}
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