NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | NOTES | SEE ALSO | COLOPHON

SD_JOURNAL_SEEK_HEAD(3)     sd_journal_seek_head     SD_JOURNAL_SEEK_HEAD(3)

NAME         top

       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

SYNOPSIS         top

       #include <systemd/sd-journal.h>

       int sd_journal_seek_head(sd_journal *j);

       int sd_journal_seek_tail(sd_journal *j);

       int sd_journal_seek_monotonic_usec(sd_journal *j, sd_id128_t boot_id,
                                          uint64_t usec);

       int sd_journal_seek_realtime_usec(sd_journal *j, uint64_t usec);

       int sd_journal_seek_cursor(sd_journal *j, const char *cursor);

DESCRIPTION         top

       sd_journal_seek_head() seeks to the beginning of the journal, i.e.
       the oldest available entry.

       Similarly, sd_journal_seek_tail() may be used to seek to the end of
       the journal, i.e. the most recent available entry.

       sd_journal_seek_monotonic_usec() 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.

       sd_journal_seek_realtime_usec() 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.

       sd_journal_seek_cursor() seeks to the entry located at the specified
       cursor string. For details on cursors, see sd_journal_get_cursor(3).
       If 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
       sd_journal_test_cursor(3).

       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.

RETURN VALUE         top

       The functions return 0 on success or a negative errno-style error
       code.

NOTES         top

       The sd_journal_seek_head(), sd_journal_seek_tail(),
       sd_journal_seek_monotonic_usec(), sd_journal_seek_realtime_usec(),
       and sd_journal_seek_cursor() interfaces are available as a shared
       library, which can be compiled and linked to with the
       libsystemd pkg-config(1) file.

SEE ALSO         top

       systemd(1), sd-journal(3), sd_journal_open(3), sd_journal_next(3),
       sd_journal_get_data(3), sd_journal_get_cursor(3),
       sd_journal_get_realtime_usec(3)

COLOPHON         top

       This page is part of the systemd (systemd system and service manager)
       project.  Information about the project can be found at 
       ⟨http://www.freedesktop.org/wiki/Software/systemd⟩.  If you have a bug
       report for this manual page, see 
       ⟨http://www.freedesktop.org/wiki/Software/systemd/#bugreports⟩.  This
       page was obtained from the project's upstream Git repository 
       ⟨https://github.com/systemd/systemd.git⟩ on 2016-07-16.  If you dis‐
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       you have corrections or improvements to the information in this
       COLOPHON (which is not part of the original manual page), send a mail
       to man-pages@man7.org

systemd 230                                          SD_JOURNAL_SEEK_HEAD(3)