NAME

       sd_journal_get_catalog, sd_journal_get_catalog_for_message_id - Retrieve message catalog
       entry

SYNOPSIS

       #include <systemd/sd-journal.h>

       int sd_journal_get_catalog(sd_journal *j, char **ret);

       int sd_journal_get_catalog_for_message_id(sd_id128_t id, char **ret);

DESCRIPTION

       sd_journal_get_catalog() retrieves a message catalog entry for the current journal entry.
       This will look up an entry in the message catalog by using the "MESSAGE_ID=" field of the
       current journal entry. Before returning the entry all journal field names in the catalog
       entry text enclosed in "@" will be replaced by the respective field values of the current
       entry. If a field name referenced in the message catalog entry does not exist, in the
       current journal entry, the "@" will be removed, but the field name otherwise left
       untouched.

       sd_journal_get_catalog_for_message_id() works similar to sd_journal_get_catalog() but the
       entry is looked up by the specified message ID (no open journal context is necessary for
       this), and no field substitution is performed.

       For more information about the journal message catalog please refer to the Journal Message
       Catalogs[1] documentation page.

RETURN VALUE

       sd_journal_get_catalog() and sd_journal_get_catalog_for_message_id() return 0 on success
       or a negative errno-style error code. If no matching message catalog entry is found,
       -ENOENT is returned.

       On successful return, ret points to a new string, which must be freed with free(3).

NOTES

       Function sd_journal_get_catalog() is thread-agnostic and only a single specific thread may
       operate on a given object during its entire lifetime. It's safe to allocate multiple
       independent objects and use each from a specific thread in parallel. However, it's not
       safe to allocate such an object in one thread, and operate or free it from any other, even
       if locking is used to ensure these threads don't operate on it at the very same time.

       Function sd_journal_get_catalog_for_message_id() is are thread-safe and may be called in
       parallel from multiple threads.

       These APIs are implemented as a shared library, which can be compiled and linked to with
       the libsystemd pkg-config(1) file.

SEE ALSO

       systemd(1), systemd.journal-fields(7), sd-journal(3), sd_journal_open(3),
       sd_journal_next(3), sd_journal_get_data(3), malloc(3)

NOTES

        1. Journal Message Catalogs
           https://www.freedesktop.org/wiki/Software/systemd/catalog