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 documentation page.
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
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systemd 231 SD_JOURNAL_GET_CATALOG(3)