Get the cursor position

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sd_journal_test_cursor

SD_JOURNAL_GET_CURSOR(3)				       sd_journal_get_cursor					  SD_JOURNAL_GET_CURSOR(3)

NAME

       sd_journal_get_cursor, sd_journal_test_cursor - Get cursor string for or test cursor string against the current journal entry

SYNOPSIS

       #include <systemd/sd-journal.h>

       int sd_journal_get_cursor(sd_journal* j, char ** cursor);

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

DESCRIPTION

       sd_journal_get_cursor() 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 sd_journal_seek_cursor(3). 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 malloc(3) and should be freed after use with free(3).

       Note that sd_journal_get_cursor() will not work before sd_journal_next(3) (or related call) has been called at least once, in order to
       position the read pointer at a valid entry.

       sd_journal_test_cursor() 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 sd_journal_seek_cursor(3) whether the entry being
       sought to was actually found in the journal or the next closest entry was used instead.

RETURN VALUE

       sd_journal_get_cursor() returns 0 on success or a negative errno-style error code.  sd_journal_test_cursor() 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.

NOTES

       The sd_journal_get_cursor() and sd_journal_test_cursor() interfaces are available as a shared library, which can be compiled and linked to
       with the libsystemd-journal pkg-config(1) file.

SEE ALSO

       systemd(1), sd-journal(3), sd_journal_open(3), sd_journal_seek_cursor(3)

systemd 208														  SD_JOURNAL_GET_CURSOR(3)

Shell Programming and Scripting