получить запись из каталога сообщений (Retrieve message catalog entry)
Имя (Name)
sd_journal_get_catalog, sd_journal_get_catalog_for_message_id -
Retrieve message catalog entry
Синопсис (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);
Описание (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
Возвращаемое значение (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).
Примечание (Note)
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.
Смотри также (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)
Примечание (Note)
1. Journal Message Catalogs
https://www.freedesktop.org/wiki/Software/systemd/catalog
