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Diffstat (limited to 'man/sd_journal_get_cursor.xml')
| -rw-r--r-- | man/sd_journal_get_cursor.xml | 242 |
1 files changed, 118 insertions, 124 deletions
diff --git a/man/sd_journal_get_cursor.xml b/man/sd_journal_get_cursor.xml index 3f5483bbda..2b7f443f29 100644 --- a/man/sd_journal_get_cursor.xml +++ b/man/sd_journal_get_cursor.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. @@ -23,128 +23,122 @@ <refentry id="sd_journal_get_cursor"> - <refentryinfo> - <title>sd_journal_get_cursor</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_get_cursor</refentrytitle> - <manvolnum>3</manvolnum> - </refmeta> - - <refnamediv> - <refname>sd_journal_get_cursor</refname> - <refname>sd_journal_test_cursor</refname> - <refpurpose>Get cursor string for or test cursor string against the current journal entry</refpurpose> - </refnamediv> - - <refsynopsisdiv> - <funcsynopsis> - <funcsynopsisinfo>#include <systemd/sd-journal.h></funcsynopsisinfo> - - <funcprototype> - <funcdef>int <function>sd_journal_get_cursor</function></funcdef> - <paramdef>sd_journal *<parameter>j</parameter></paramdef> - <paramdef>char **<parameter>cursor</parameter></paramdef> - </funcprototype> - - <funcprototype> - <funcdef>int <function>sd_journal_test_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_get_cursor()</function> - returns a cursor string for the current journal - entry. A cursor is a serialization of the current - journal position formatted as text. The string only - contains printable characters and can be passed around - in text form. The cursor identifies a journal entry - globally and in a stable way and may be used to later - seek to it via - <citerefentry><refentrytitle>sd_journal_seek_cursor</refentrytitle><manvolnum>3</manvolnum></citerefentry>. The - cursor string should be considered opaque and not be - parsed by clients. Seeking to a cursor position - without the specific entry being available locally - will seek to the next closest (in terms of time) - available entry. The call takes two arguments: a - journal context object and a pointer to a string - pointer where the cursor string will be placed. The - string is allocated via libc - <citerefentry><refentrytitle>malloc</refentrytitle><manvolnum>3</manvolnum></citerefentry> - and should be freed after use with - <citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para> - - <para>Note that - <function>sd_journal_get_cursor()</function> will not - work before - <citerefentry><refentrytitle>sd_journal_next</refentrytitle><manvolnum>3</manvolnum></citerefentry> - (or related call) has been called at least once, in - order to position the read pointer at a valid - entry.</para> - - <para><function>sd_journal_test_cursor()</function> - may be used to check whether the current position in - the journal matches the specified cursor. This is - useful since cursor strings do not uniquely identify - an entry: the same entry might be referred to by - multiple different cursor strings, and hence string - comparing cursors is not possible. Use this call to - verify after an invocation of - <citerefentry><refentrytitle>sd_journal_seek_cursor</refentrytitle><manvolnum>3</manvolnum></citerefentry> - whether the entry being sought to was actually found - in the journal or the next closest entry was used - instead.</para> - </refsect1> - - <refsect1> - <title>Return Value</title> - - <para><function>sd_journal_get_cursor()</function> - returns 0 on success or a negative errno-style error - code. <function>sd_journal_test_cursor()</function> - returns positive if the current entry matches the - specified cursor, 0 if it does not match the specified - cursor or a negative errno-style error code on - failure.</para> - </refsect1> - - <refsect1> - <title>Notes</title> - - <para>The <function>sd_journal_get_cursor()</function> - and <function>sd_journal_test_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_seek_cursor</refentrytitle><manvolnum>3</manvolnum></citerefentry> - </para> - </refsect1> + <refentryinfo> + <title>sd_journal_get_cursor</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_get_cursor</refentrytitle> + <manvolnum>3</manvolnum> + </refmeta> + + <refnamediv> + <refname>sd_journal_get_cursor</refname> + <refname>sd_journal_test_cursor</refname> + <refpurpose>Get cursor string for or test cursor string against the current journal entry</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcsynopsisinfo>#include <systemd/sd-journal.h></funcsynopsisinfo> + + <funcprototype> + <funcdef>int <function>sd_journal_get_cursor</function></funcdef> + <paramdef>sd_journal *<parameter>j</parameter></paramdef> + <paramdef>char **<parameter>cursor</parameter></paramdef> + </funcprototype> + + <funcprototype> + <funcdef>int <function>sd_journal_test_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_get_cursor()</function> returns a + cursor string for the current journal entry. A cursor is a + serialization of the current journal position formatted as text. + The string only contains printable characters and can be passed + around in text form. The cursor identifies a journal entry + globally and in a stable way and may be used to later seek to it + via + <citerefentry><refentrytitle>sd_journal_seek_cursor</refentrytitle><manvolnum>3</manvolnum></citerefentry>. + The cursor string should be considered opaque and not be parsed by + clients. Seeking to a cursor position without the specific entry + being available locally will seek to the next closest (in terms of + time) available entry. The call takes two arguments: a journal + context object and a pointer to a string pointer where the cursor + string will be placed. The string is allocated via libc + <citerefentry><refentrytitle>malloc</refentrytitle><manvolnum>3</manvolnum></citerefentry> + and should be freed after use with + <citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para> + + <para>Note that <function>sd_journal_get_cursor()</function> will + not work before + <citerefentry><refentrytitle>sd_journal_next</refentrytitle><manvolnum>3</manvolnum></citerefentry> + (or related call) has been called at least once, in order to + position the read pointer at a valid entry.</para> + + <para><function>sd_journal_test_cursor()</function> + may be used to check whether the current position in + the journal matches the specified cursor. This is + useful since cursor strings do not uniquely identify + an entry: the same entry might be referred to by + multiple different cursor strings, and hence string + comparing cursors is not possible. Use this call to + verify after an invocation of + <citerefentry><refentrytitle>sd_journal_seek_cursor</refentrytitle><manvolnum>3</manvolnum></citerefentry> + whether the entry being sought to was actually found + in the journal or the next closest entry was used + instead.</para> + </refsect1> + + <refsect1> + <title>Return Value</title> + + <para><function>sd_journal_get_cursor()</function> returns 0 on + success or a negative errno-style error code. + <function>sd_journal_test_cursor()</function> returns positive if + the current entry matches the specified cursor, 0 if it does not + match the specified cursor or a negative errno-style error code on + failure.</para> + </refsect1> + + <refsect1> + <title>Notes</title> + + <para>The <function>sd_journal_get_cursor()</function> and + <function>sd_journal_test_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_seek_cursor</refentrytitle><manvolnum>3</manvolnum></citerefentry> + </para> + </refsect1> </refentry> |