man/journal-iterate-unique.c

   1 #include <stdio.h>
   2 #include <string.h>
   3 #include <systemd/sd-journal.h>
   4
   5 int main(int argc, char *argv[]) {
   6   sd_journal *j;
   7   const void *d;
   8   size_t l;
   9   int r;
  10
  11   r = sd_journal_open(&j, SD_JOURNAL_LOCAL_ONLY);
  12   if (r < 0) {
  13     fprintf(stderr, "Failed to open journal: %s\n", strerror(-r));
  14     return 1;
  15   }
  16   r = sd_journal_query_unique(j, "_SYSTEMD_UNIT");
  17   if (r < 0) {
  18     fprintf(stderr, "Failed to query journal: %s\n", strerror(-r));
  19     return 1;
  20   }
  21   SD_JOURNAL_FOREACH_UNIQUE(j, d, l)
  22     printf("%.*s\n", (int) l, (const char*) d);
  23   sd_journal_close(j);
  24   return 0;
  25 }