systemd Developer Lennart Poettering lennart@poettering.net sd-journal 3 sd-journal APIs for submitting and querying log entries to and from the journal #include <systemd/sd-journal.h> pkg-config --cflags --libs libsystemd-journal sd-journal.h provides APIs to submit and query log entries. The APIs exposed act both as client for the systemd-journald.service8 journal service and as parser for the journal files on disk. See sd_journal_print3, sd_journal_stream_fd3, sd_journal_open3, sd_journal_next3, sd_journal_get_realtime_usec3, sd_journal_add_match3, sd_journal_seek_head3, sd_journal_get_cursor3, sd_journal_cutoff_realtime_usec3, sd_journal_get_usage3, sd_journal_get_catalog3 and sd_journal_get_fd3 for more information about the functions implemented. Command line access for submitting entries to the journal is available with the systemd-cat1 tool. Command line access for querying entries from the journal is available with the journalctl1 tool. These APIs are implemented as shared library, which can be compiled and linked to with the libsystemd-journal pkg-config1 file. systemd1, sd_journal_print3, sd_journal_stream_fd3, sd_journal_open3, sd_journal_next3, sd_journal_get_data3, sd_journal_get_realtime_usec3, sd_journal_add_match3, sd_journal_seek_head3, sd_journal_get_cursor3, sd_journal_cutoff_realtime_usec3, sd_journal_get_usage3, sd_journal_get_fd3, sd_journal_query_unique3, sd_journal_get_catalog3, journalctl1, sd-id1283, pkg-config1