1) SD_JOURNAL_APPEND
2) sd_journal_append
3) sd_journal_get_events
4) sd_journal_get_fd
5) sd_journal_get_timeout
6) SD_JOURNAL_INVALIDATE
7) sd_journal_invalidate
8) SD_JOURNAL_NOP
9) sd_journal_nop
10) sd_journal_process
11) sd_journal_reliable_fd
12) sd_journal_wait
