man/journal-enumerate-fields.c


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/* 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 char *field;
  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;
  }
  SD_JOURNAL_FOREACH_FIELD(j, field)
    printf("%s\n", field);
  sd_journal_close(j);
  return 0;
}