SD-VARLINK(3)                     sd-varlink                     SD-VARLINK(3)

NAME
       sd-varlink - APIs for Varlink IPC

SYNOPSIS
       #include <systemd/sd-varlink.h>

       pkg-config --cflags --libs libsystemd

DESCRIPTION
       sd-varlink.h is part of libsystemd(3) and provides APIs for
       implementing Varlink IPC clients and services. See https://varlink.org/
       for more information about Varlink IPC.

       Varlink IPC uses JSON[1] as marshalling format. The sd-varlink API
       relies on the sd-json(3) API for JSON serialization, deserialization
       and manipulation.

       The varlinkctl(1) tool makes the functionality implemented by
       sd-varlink available from the command line.

NOTES
       Functions described here are available as a shared library, which can
       be compiled against and linked to with the libsystemd pkg-config(1)
       file.

       The code described here uses getenv(3), which is declared to be not
       multi-thread-safe. This means that the code calling the functions
       described here must not call setenv(3) from a parallel thread. It is
       recommended to only do calls to setenv() from an early phase of the
       program when no other threads have been started.

SEE ALSO
       systemd(1), sd-event(3), sd-json(3), varlinkctl(1), sd-bus(3), pkg-
       config(1)

NOTES
        1. JSON
           https://json.org/

systemd 257                                                      SD-VARLINK(3)