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NAME | SYNOPSIS | DESCRIPTION | THREAD SAFETY | NOTES | SEE ALSO | COLOPHON |
SD-JOURNAL(3) sd-journal 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
sd-journal.h provides APIs to submit and query log entries. The APIs
exposed act both as client for the systemd-journald.service(8)
journal service and as parser for the journal files on disk.
See sd_journal_print(3), sd_journal_stream_fd(3), sd_journal_open(3),
sd_journal_next(3), sd_journal_get_realtime_usec(3),
sd_journal_add_match(3), sd_journal_seek_head(3),
sd_journal_enumerate_fields(3), sd_journal_get_cursor(3),
sd_journal_get_cutoff_realtime_usec(3),
sd_journal_get_cutoff_monotonic_usec(3), sd_journal_get_usage(3),
sd_journal_get_catalog(3), sd_journal_get_fd(3),
sd_journal_has_runtime_files(3) and
sd_journal_has_persistent_files(3) for more information about the
functions implemented.
Command line access for submitting entries to the journal is
available with the systemd-cat(1) tool. Command line access for
querying entries from the journal is available with the journalctl(1)
tool.
Functions that operate on the sd_journal object are thread agnostic —
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 — those that are used to send entries to the journal, like
sd_journal_print(3) and similar, or those that are used to retrieve
global information like sd_journal_stream_fd(3) and
sd_journal_get_catalog_for_message_id(3) — are thread-safe and may be
called from multiple threads in parallel.
These APIs are implemented as a shared library, which can be compiled
and linked to with the libsystemd pkg-config(1) file.
systemd(1), sd_journal_print(3), sd_journal_stream_fd(3),
sd_journal_open(3), sd_journal_next(3), sd_journal_get_data(3),
sd_journal_get_realtime_usec(3), sd_journal_add_match(3),
sd_journal_seek_head(3), sd_journal_enumerate_fields(3),
sd_journal_get_cursor(3), sd_journal_get_cutoff_realtime_usec(3),
sd_journal_get_cutoff_monotonic_usec(3), sd_journal_get_usage(3),
sd_journal_get_fd(3), sd_journal_query_unique(3),
sd_journal_get_catalog(3), sd_journal_has_runtime_files(3),
sd_journal_has_persistent_files(3), journalctl(1), sd-id128(3),
pkg-config(1)
This page is part of the systemd (systemd system and service manager)
project. Information about the project can be found at
⟨http://www.freedesktop.org/wiki/Software/systemd⟩. If you have a bug
report for this manual page, see
⟨http://www.freedesktop.org/wiki/Software/systemd/#bugreports⟩. This
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⟨https://github.com/systemd/systemd.git⟩ on 2017-07-05. If you dis‐
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you have corrections or improvements to the information in this
COLOPHON (which is not part of the original manual page), send a mail
to man-pages@man7.org
systemd 234 SD-JOURNAL(3)
Pages that refer to this page: sd_journal_add_match(3), sd_journal_enumerate_fields(3), sd_journal_get_catalog(3), sd_journal_get_cursor(3), sd_journal_get_cutoff_realtime_usec(3), sd_journal_get_data(3), sd_journal_get_fd(3), sd_journal_get_realtime_usec(3), sd_journal_get_usage(3), sd_journal_has_runtime_files(3), sd_journal_next(3), sd_journal_open(3), sd_journal_print(3), sd_journal_query_unique(3), sd_journal_seek_head(3), sd_journal_stream_fd(3), systemd.directives(7), systemd.index(7), systemd.journal-fields(7), systemd-journald.service(8)