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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | NOTES | HISTORY | SEE ALSO | COLOPHON |
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SD_BUS_START(3) sd_bus_start SD_BUS_START(3)
sd_bus_start - Initiate a bus connection to the D-bus broker
daemon
#include <systemd/sd-bus.h>
int sd_bus_start(sd_bus *bus);
sd_bus_start() connects an existing bus connection object to the
D-Bus broker daemon, usually dbus-daemon(1) or dbus-broker(1). The
mechanism to use for the connection must be configured before the
call to sd_bus_start(), using one of sd_bus_set_address(3),
sd_bus_set_fd(3), or sd_bus_set_exec(3). sd_bus_start() will open
the connection socket or spawn the executable as needed, and
asynchronously start a org.freedesktop.DBus.Hello() call. The
answer to the Hello call will be processed later from
sd_bus_process(3). If opening of the connection or queuing of the
asynchronous call fail, the connection will be closed with
sd_bus_close(3).
In most cases, it is better to use sd_bus_default_user(3),
sd_bus_default_system(3) or related calls instead of the more
low-level sd_bus_new() and sd_bus_start(). The higher-level
functions not only allocate a bus object but also start the
connection to a well-known bus in a single function call.
On success, this function returns a non-negative integer. On
failure, it returns a negative errno-style error code.
Errors
-EINVAL
The input parameter bus is NULL.
Added in version 246.
-ENOPKG
Bus object bus could not be resolved.
Added in version 246.
-EPERM
The input parameter bus is in a wrong state (sd_bus_start()
may only be called once on a newly-created bus object).
Added in version 246.
-ECHILD
The bus object bus was created in a different process.
Added in version 246.
In addition, other connection-related errors may be returned. See
sd_bus_send(3).
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.
sd_bus_start() was added in version 246.
systemd(1), sd-bus(3), sd_bus_default(3), sd_bus_call_async(3)
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 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 is not part of the original manual page), send a mail to
man-pages@man7.org
systemd 258~rc2 SD_BUS_START(3)
Pages that refer to this page: sd-bus(3), sd_bus_default(3), sd_bus_is_open(3), sd_bus_negotiate_fds(3), sd_bus_new(3), sd_bus_set_address(3), sd_bus_set_fd(3), sd_bus_set_server(3), systemd.directives(7), systemd.index(7)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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