sd_journal_seek_head, sd_journal_seek_tail, sd_journal_seek_monotonic_usec, sd_journal_seek_realtime_usec, sd_journal_seek_cursor — Seek to a position in the journal
|const char * cursor|
seeks to the beginning of the journal, i.e. the oldest
sd_journal_seek_tail() may be
used to seek to the end of the journal, i.e. the most
recent available entry.
seeks to the entry with the specified monotonic
timestamp, i.e. CLOCK_MONOTONIC. Since monotonic time
restarts on every reboot a boot ID needs to be
specified as well.
seeks to the entry with the specified realtime
(wallclock) timestamp, i.e. CLOCK_REALTIME. Note that
the realtime clock is not necessarily monotonic. If a
realtime timestamp is ambiguous it is not defined
which position is sought to.
seeks to the entry located at the specified cursor
string. For details on cursors see
no entry matching the specified cursor is found the
call will seek to the next closest entry (in terms of
time) instead. To verify whether the newly selected
entry actually matches the cursor use
Note that these calls do not actually make any entry the new current entry, this needs to be done in a separate step with a subsequent sd_journal_next(3) invocation (or a similar call). Only then entry data may be retrieved via sd_journal_get_data(3). If no entry exists that matches exactly the specified seek address the next closest is sought to. If sd_journal_next(3) is used the closest following entry will be sought to, if sd_journal_previous(3) is used the closest preceding entry is sought to.
The functions return 0 on success or a negative errno-style error code.
interfaces are available as shared library, which can
be compiled and linked to with the