'\" t
.TH "SD\-JOURNAL" "3" "" "systemd 232" "sd-journal"
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.SH "NAME"
sd-journal \- APIs for submitting and querying log entries to and from the journal
.SH "SYNOPSIS"
.sp
.ft B
.nf
#include <systemd/sd\-journal\&.h>
.fi
.ft
.HP \w'\fBpkg\-config\ \-\-cflags\ \-\-libs\ libsystemd\fR\ 'u
\fBpkg\-config \-\-cflags \-\-libs libsystemd\fR
.SH "DESCRIPTION"
.PP
sd\-journal\&.h
provides APIs to submit and query log entries\&. The APIs exposed act both as client for the
\fBsystemd-journald.service\fR(8)
journal service and as parser for the journal files on disk\&.
.PP
See
\fBsd_journal_print\fR(3),
\fBsd_journal_stream_fd\fR(3),
\fBsd_journal_open\fR(3),
\fBsd_journal_next\fR(3),
\fBsd_journal_get_realtime_usec\fR(3),
\fBsd_journal_add_match\fR(3),
\fBsd_journal_seek_head\fR(3),
\fBsd_journal_enumerate_fields\fR(3),
\fBsd_journal_get_cursor\fR(3),
\fBsd_journal_get_cutoff_realtime_usec\fR(3),
\fBsd_journal_get_cutoff_monotonic_usec\fR(3),
\fBsd_journal_get_usage\fR(3),
\fBsd_journal_get_catalog\fR(3),
\fBsd_journal_get_fd\fR(3),
\fBsd_journal_has_runtime_files\fR(3)
and
\fBsd_journal_has_persistent_files\fR(3)
for more information about the functions implemented\&.
.PP
Command line access for submitting entries to the journal is available with the
\fBsystemd-cat\fR(1)
tool\&. Command line access for querying entries from the journal is available with the
\fBjournalctl\fR(1)
tool\&.
.SH "THREAD SAFETY"
.PP
Functions that operate on the
sd_journal
object are thread agnostic \(em given
sd_journal
pointer may only be used from one thread at a time, but multiple threads may use multiple such objects safely\&. Other functions \(em those that are used to send entries to the journal, like
\fBsd_journal_print\fR(3)
and similar, or those that are used to retrieve global information like
\fBsd_journal_stream_fd\fR(3)
and
\fBsd_journal_get_catalog_for_message_id\fR(3)
\(em are thread\-safe and may be called from multiple threads in parallel\&.
.SH "NOTES"
.PP
These APIs are implemented as a shared library, which can be compiled and linked to with the
\fBlibsystemd\fR\ \&\fBpkg-config\fR(1)
file\&.
.SH "SEE ALSO"
.PP
\fBsystemd\fR(1),
\fBsd_journal_print\fR(3),
\fBsd_journal_stream_fd\fR(3),
\fBsd_journal_open\fR(3),
\fBsd_journal_next\fR(3),
\fBsd_journal_get_data\fR(3),
\fBsd_journal_get_realtime_usec\fR(3),
\fBsd_journal_add_match\fR(3),
\fBsd_journal_seek_head\fR(3),
\fBsd_journal_enumerate_fields\fR(3),
\fBsd_journal_get_cursor\fR(3),
\fBsd_journal_get_cutoff_realtime_usec\fR(3),
\fBsd_journal_get_cutoff_monotonic_usec\fR(3),
\fBsd_journal_get_usage\fR(3),
\fBsd_journal_get_fd\fR(3),
\fBsd_journal_query_unique\fR(3),
\fBsd_journal_get_catalog\fR(3),
\fBsd_journal_has_runtime_files\fR(3),
\fBsd_journal_has_persistent_files\fR(3),
\fBjournalctl\fR(1),
\fBsd-id128\fR(3),
\fBpkg-config\fR(1)