sd_journal_get_catalog, sd_journal_get_catalog_for_message_id - Retrieve message
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_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).
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.
- Journal Message Catalogs