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libsystemd(3) — Linux manual page

LIBSYSTEMD(3)                   libsystemdLIBSYSTEMD(3)

NAME        top

       libsystemd - Functions for implementing services and interacting       with systemd

SYNOPSIS        top

       #include <systemd/sd-bus.h>       #include <systemd/sd-daemon.h>       #include <systemd/sd-device.h>       #include <systemd/sd-event.h>       #include <systemd/sd-gpt.h>       #include <systemd/sd-hwdb.h>       #include <systemd/sd-id128.h>       #include <systemd/sd-journal.h>       #include <systemd/sd-json.h>       #include <systemd/sd-login.h>       #include <systemd/sd-messages.h>       #include <systemd/sd-path.h>       #include <systemd/sd-varlink.h>pkg-config --cflags --libs libsystemd

DESCRIPTION        top

       The libsystemd library provides functions that allow interacting       with various interfaces provided by thesystemd(1) service       manager, as well as various other functions and constants useful       for implementing services in general.       Seesd-bus(3),sd-bus-errors(3),sd-daemon(3),sd-device(3),sd-event(3),sd-hwdb(3),sd-id128(3),sd-journal(3),sd-json(3),sd-login(3) andsd-varlink(3) for information about different       parts of the library interface.

INTERFACE STABILITY        top

       Strict backwards-compatibility is maintained for the API       (application programming interface) and ABI (application binary       interface). Symbol versioning is used, with symbols only added and       never removed.

NOTES        top

       Functions described here are available as a shared library, which       can be compiled against and linked to with thelibsystemd pkg-config(1) file.       The code described here usesgetenv(3), which is declared to be       not multi-thread-safe. This means that the code calling the       functions described here must not callsetenv(3) from a parallel       thread. It is recommended to only do calls tosetenv()from an       early phase of the program when no other threads have been       started.

SEE ALSO        top

systemd(1),libudev(3),pkg-config(1),Interface Portability andStability Promise[1]

NOTES        top

        1. Interface Portability and Stability Promisehttps://systemd.io/PORTABILITY_AND_STABILITY/

COLOPHON        top

       This page is part of thesystemd (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 page was obtained from the project's upstream Git repository       ⟨https://github.com/systemd/systemd.git⟩ on 2025-08-11.  (At that       time, the date of the most recent commit that was found in the       repository was 2025-08-11.)  If you discover any rendering       problems in this HTML version of the page, or you believe there is       a better or more up-to-date source for the page, or you have       corrections or improvements to the information in this COLOPHON       (which isnot part of the original manual page), send a mail to       man-pages@man7.orgsystemd 258~rc2LIBSYSTEMD(3)

Pages that refer to this page:sd-bus(3), sd-bus-errors(3), sd-daemon(3), sd-device(3), sd-event(3), sd-hwdb(3), sd-id128(3), sd-journal(3), sd-json(3), sd-login(3), sd-varlink(3), systemd.service(5), systemd.directives(7), systemd.index(7)

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