1 files changed, 29 insertions, 0 deletions
diff --git a/man/journal-iterate-unique.c b/man/journal-iterate-unique.c
new file mode 100644
index 0000000..5fe98b3
--- /dev/null
+++ b/man/journal-iterate-unique.c
@@ -0,0 +1,29 @@
+/* SPDX-License-Identifier: MIT-0 */
+
+#include <errno.h>
+#include <stdio.h>
+#include <systemd/sd-journal.h>
+
+int main(int argc, char *argv[]) {
+  sd_journal *j;
+  const void *d;
+  size_t l;
+  int r;
+
+  r = sd_journal_open(&j, SD_JOURNAL_LOCAL_ONLY);
+  if (r < 0) {
+    errno = -r;
+    fprintf(stderr, "Failed to open journal: %m\n");
+    return 1;
+  }
+  r = sd_journal_query_unique(j, "_SYSTEMD_UNIT");
+  if (r < 0) {
+    errno = -r;
+    fprintf(stderr, "Failed to query journal: %m\n");
+    return 1;
+  }
+  SD_JOURNAL_FOREACH_UNIQUE(j, d, l)
+    printf("%.*s\n", (int) l, (const char*) d);
+  sd_journal_close(j);
+  return 0;
+}