| SD_JOURNAL_QUERY_UNIQUE(3) | sd_journal_query_unique | SD_JOURNAL_QUERY_UNIQUE(3) |
sd_journal_query_unique, sd_journal_enumerate_unique, sd_journal_enumerate_available_unique, sd_journal_restart_unique, SD_JOURNAL_FOREACH_UNIQUE - Read unique data fields from the journal
#include <elogind/sd-journal.h>
int sd_journal_query_unique(sd_journal *j, const char *field);
int sd_journal_enumerate_available_unique(sd_journal *j, const void **data, size_t *length);
int sd_journal_enumerate_unique(sd_journal *j, const void **data, size_t *length);
void sd_journal_restart_unique(sd_journal *j);
SD_JOURNAL_FOREACH_UNIQUE(sd_journal *j, const void *data, size_t length);
sd_journal_query_unique() is not needed in elogind and does nothing.
sd_journal_enumerate_unique() can not do anything in elogind, as there is no systemd-journal on elogind powered systems.
sd_journal_restart_unique() resets the data enumeration index to the beginning of the list, which effectively does nothing.
Note that the SD_JOURNAL_FOREACH_UNIQUE() macro will therefore never do anything.
sd_journal_query_unique() returns 0 on success or a negative errno-style error code. sd_journal_enumerate_unique() and and
sd_journal_query_available_unique() always return 0.
sd_journal_restart_unique() doesn't return anything.
These APIs are implemented as a shared library, which can be compiled and linked to with the libelogind pkg-config(1) file.
elogind(8), elogind.journal-fields(7),
sd_journal_open(3), sd_journal_enumerate_fields(3), sd_journal_get_data(3), sd_journal_add_match(3)
| elogind 246.10 |