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Diffstat (limited to 'man/sd_journal_seek_head.xml')
| -rw-r--r-- | man/sd_journal_seek_head.xml | 299 |
1 files changed, 146 insertions, 153 deletions
diff --git a/man/sd_journal_seek_head.xml b/man/sd_journal_seek_head.xml index 2ef37e5288..d74c2d5bbc 100644 --- a/man/sd_journal_seek_head.xml +++ b/man/sd_journal_seek_head.xml @@ -1,6 +1,6 @@ <?xml version='1.0'?> <!--*-nxml-*--> <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" - "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> + "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> <!-- This file is part of systemd. @@ -23,157 +23,150 @@ <refentry id="sd_journal_seek_head"> - <refentryinfo> - <title>sd_journal_seek_head</title> - <productname>systemd</productname> - - <authorgroup> - <author> - <contrib>Developer</contrib> - <firstname>Lennart</firstname> - <surname>Poettering</surname> - <email>lennart@poettering.net</email> - </author> - </authorgroup> - </refentryinfo> - - <refmeta> - <refentrytitle>sd_journal_seek_head</refentrytitle> - <manvolnum>3</manvolnum> - </refmeta> - - <refnamediv> - <refname>sd_journal_seek_head</refname> - <refname>sd_journal_seek_tail</refname> - <refname>sd_journal_seek_monotonic_usec</refname> - <refname>sd_journal_seek_realtime_usec</refname> - <refname>sd_journal_seek_cursor</refname> - <refpurpose>Seek to a position in the - journal</refpurpose> - </refnamediv> - - <refsynopsisdiv> - <funcsynopsis> - <funcsynopsisinfo>#include <systemd/sd-journal.h></funcsynopsisinfo> - - <funcprototype> - <funcdef>int <function>sd_journal_seek_head</function></funcdef> - <paramdef>sd_journal *<parameter>j</parameter></paramdef> - </funcprototype> - - <funcprototype> - <funcdef>int <function>sd_journal_seek_tail</function></funcdef> - <paramdef>sd_journal *<parameter>j</parameter></paramdef> - </funcprototype> - - <funcprototype> - <funcdef>int <function>sd_journal_seek_monotonic_usec</function></funcdef> - <paramdef>sd_journal *<parameter>j</parameter></paramdef> - <paramdef>sd_id128_t <parameter>boot_id</parameter></paramdef> - <paramdef>uint64_t <parameter>usec</parameter></paramdef> - </funcprototype> - - <funcprototype> - <funcdef>int <function>sd_journal_seek_realtime_usec</function></funcdef> - <paramdef>sd_journal *<parameter>j</parameter></paramdef> - <paramdef>uint64_t <parameter>usec</parameter></paramdef> - </funcprototype> - - <funcprototype> - <funcdef>int <function>sd_journal_seek_cursor</function></funcdef> - <paramdef>sd_journal *<parameter>j</parameter></paramdef> - <paramdef>const char *<parameter>cursor</parameter></paramdef> - </funcprototype> - </funcsynopsis> - </refsynopsisdiv> - - <refsect1> - <title>Description</title> - - <para><function>sd_journal_seek_head()</function> - seeks to the beginning of the journal, i.e. the oldest - available entry.</para> - - <para>Similarly, - <function>sd_journal_seek_tail()</function> may be - used to seek to the end of the journal, i.e. the most - recent available entry.</para> - - <para><function>sd_journal_seek_monotonic_usec()</function> - seeks to the entry with the specified monotonic - timestamp, - i.e. <constant>CLOCK_MONOTONIC</constant>. Since - monotonic time restarts on every reboot a boot ID - needs to be specified as well.</para> - - <para><function>sd_journal_seek_realtime_usec()</function> - seeks to the entry with the specified realtime - (wallclock) timestamp, - i.e. <constant>CLOCK_REALTIME</constant>. Note that - the realtime clock is not necessarily monotonic. If a - realtime timestamp is ambiguous, it is not defined - which position is sought to.</para> - - <para><function>sd_journal_seek_cursor()</function> - seeks to the entry located at the specified cursor - string. For details on cursors, see - <citerefentry><refentrytitle>sd_journal_get_cursor</refentrytitle><manvolnum>3</manvolnum></citerefentry>. 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 - <citerefentry><refentrytitle>sd_journal_test_cursor</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para> - - <para>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 - <citerefentry><refentrytitle>sd_journal_next</refentrytitle><manvolnum>3</manvolnum></citerefentry> - invocation (or a similar call). Only then, entry data - may be retrieved via - <citerefentry><refentrytitle>sd_journal_get_data</refentrytitle><manvolnum>3</manvolnum></citerefentry>. If - no entry exists that matches exactly the specified - seek address, the next closest is sought to. If - <citerefentry><refentrytitle>sd_journal_next</refentrytitle><manvolnum>3</manvolnum></citerefentry> - is used, the closest following entry will be sought to, - if - <citerefentry><refentrytitle>sd_journal_previous</refentrytitle><manvolnum>3</manvolnum></citerefentry> - is used the closest preceding entry is sought - to.</para> - </refsect1> - - <refsect1> - <title>Return Value</title> - - <para>The functions return 0 on success or a negative - errno-style error code.</para> - </refsect1> - - <refsect1> - <title>Notes</title> - - <para>The <function>sd_journal_seek_head()</function>, - <function>sd_journal_seek_tail()</function>, - <function>sd_journal_seek_monotonic_usec()</function>, - <function>sd_journal_seek_realtime_usec()</function>, - and <function>sd_journal_seek_cursor()</function> - interfaces are available as a shared library, which can - be compiled and linked to with the - <constant>libsystemd</constant> <citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry> - file.</para> - </refsect1> - - <refsect1> - <title>See Also</title> - - <para> - <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, - <citerefentry><refentrytitle>sd-journal</refentrytitle><manvolnum>3</manvolnum></citerefentry>, - <citerefentry><refentrytitle>sd_journal_open</refentrytitle><manvolnum>3</manvolnum></citerefentry>, - <citerefentry><refentrytitle>sd_journal_next</refentrytitle><manvolnum>3</manvolnum></citerefentry>, - <citerefentry><refentrytitle>sd_journal_get_data</refentrytitle><manvolnum>3</manvolnum></citerefentry>, - <citerefentry><refentrytitle>sd_journal_get_cursor</refentrytitle><manvolnum>3</manvolnum></citerefentry>, - <citerefentry><refentrytitle>sd_journal_get_realtime_usec</refentrytitle><manvolnum>3</manvolnum></citerefentry> - </para> - </refsect1> + <refentryinfo> + <title>sd_journal_seek_head</title> + <productname>systemd</productname> + + <authorgroup> + <author> + <contrib>Developer</contrib> + <firstname>Lennart</firstname> + <surname>Poettering</surname> + <email>lennart@poettering.net</email> + </author> + </authorgroup> + </refentryinfo> + + <refmeta> + <refentrytitle>sd_journal_seek_head</refentrytitle> + <manvolnum>3</manvolnum> + </refmeta> + + <refnamediv> + <refname>sd_journal_seek_head</refname> + <refname>sd_journal_seek_tail</refname> + <refname>sd_journal_seek_monotonic_usec</refname> + <refname>sd_journal_seek_realtime_usec</refname> + <refname>sd_journal_seek_cursor</refname> + <refpurpose>Seek to a position in the + journal</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcsynopsisinfo>#include <systemd/sd-journal.h></funcsynopsisinfo> + + <funcprototype> + <funcdef>int <function>sd_journal_seek_head</function></funcdef> + <paramdef>sd_journal *<parameter>j</parameter></paramdef> + </funcprototype> + + <funcprototype> + <funcdef>int <function>sd_journal_seek_tail</function></funcdef> + <paramdef>sd_journal *<parameter>j</parameter></paramdef> + </funcprototype> + + <funcprototype> + <funcdef>int <function>sd_journal_seek_monotonic_usec</function></funcdef> + <paramdef>sd_journal *<parameter>j</parameter></paramdef> + <paramdef>sd_id128_t <parameter>boot_id</parameter></paramdef> + <paramdef>uint64_t <parameter>usec</parameter></paramdef> + </funcprototype> + + <funcprototype> + <funcdef>int <function>sd_journal_seek_realtime_usec</function></funcdef> + <paramdef>sd_journal *<parameter>j</parameter></paramdef> + <paramdef>uint64_t <parameter>usec</parameter></paramdef> + </funcprototype> + + <funcprototype> + <funcdef>int <function>sd_journal_seek_cursor</function></funcdef> + <paramdef>sd_journal *<parameter>j</parameter></paramdef> + <paramdef>const char *<parameter>cursor</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Description</title> + + <para><function>sd_journal_seek_head()</function> seeks to the + beginning of the journal, i.e. the oldest available entry.</para> + + <para>Similarly, <function>sd_journal_seek_tail()</function> may + be used to seek to the end of the journal, i.e. the most recent + available entry.</para> + + <para><function>sd_journal_seek_monotonic_usec()</function> seeks + to the entry with the specified monotonic timestamp, i.e. + <constant>CLOCK_MONOTONIC</constant>. Since monotonic time + restarts on every reboot a boot ID needs to be specified as + well.</para> + + <para><function>sd_journal_seek_realtime_usec()</function> seeks + to the entry with the specified realtime (wallclock) timestamp, + i.e. <constant>CLOCK_REALTIME</constant>. Note that the realtime + clock is not necessarily monotonic. If a realtime timestamp is + ambiguous, it is not defined which position is sought to.</para> + + <para><function>sd_journal_seek_cursor()</function> seeks to the + entry located at the specified cursor string. For details on + cursors, see + <citerefentry><refentrytitle>sd_journal_get_cursor</refentrytitle><manvolnum>3</manvolnum></citerefentry>. + 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 + <citerefentry><refentrytitle>sd_journal_test_cursor</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para> + + <para>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 + <citerefentry><refentrytitle>sd_journal_next</refentrytitle><manvolnum>3</manvolnum></citerefentry> + invocation (or a similar call). Only then, entry data may be + retrieved via + <citerefentry><refentrytitle>sd_journal_get_data</refentrytitle><manvolnum>3</manvolnum></citerefentry>. + If no entry exists that matches exactly the specified seek + address, the next closest is sought to. If + <citerefentry><refentrytitle>sd_journal_next</refentrytitle><manvolnum>3</manvolnum></citerefentry> + is used, the closest following entry will be sought to, if + <citerefentry><refentrytitle>sd_journal_previous</refentrytitle><manvolnum>3</manvolnum></citerefentry> + is used the closest preceding entry is sought to.</para> + </refsect1> + + <refsect1> + <title>Return Value</title> + + <para>The functions return 0 on success or a negative errno-style + error code.</para> + </refsect1> + + <refsect1> + <title>Notes</title> + + <para>The <function>sd_journal_seek_head()</function>, + <function>sd_journal_seek_tail()</function>, + <function>sd_journal_seek_monotonic_usec()</function>, + <function>sd_journal_seek_realtime_usec()</function>, + and <function>sd_journal_seek_cursor()</function> + interfaces are available as a shared library, which can + be compiled and linked to with the + <constant>libsystemd</constant> <citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry> + file.</para> + </refsect1> + + <refsect1> + <title>See Also</title> + + <para> + <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sd-journal</refentrytitle><manvolnum>3</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sd_journal_open</refentrytitle><manvolnum>3</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sd_journal_next</refentrytitle><manvolnum>3</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sd_journal_get_data</refentrytitle><manvolnum>3</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sd_journal_get_cursor</refentrytitle><manvolnum>3</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sd_journal_get_realtime_usec</refentrytitle><manvolnum>3</manvolnum></citerefentry> + </para> + </refsect1> </refentry> |