|
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | NOTES | SEE ALSO | COLOPHON |
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.
-ENOPKG
Bus object bus could not be resolved.
-EPERM
The input parameter bus is in a wrong state (sd_bus_start() may
only be called once on a newly-created bus object).
-ECHILD
The bus object bus was created in a different process.
In addition, other connection-related errors may be returned. See
sd_bus_send(3).
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-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 2020-08-13. (At that
time, the date of the most recent commit that was found in the repos‐
itory was 2020-08-11.) If you discover any rendering problems in
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more up-to-date source for the page, or you have corrections or
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of the original manual page), send a mail to man-pages@man7.org
systemd 246 SD_BUS_START(3)
Pages that refer to this page: sd-bus(3) , sd_bus_close_unref(3) , sd_bus_close_unrefp(3) , sd_bus_default(3) , sd_bus_default_system(3) , sd_bus_default_user(3) , sd_bus_flush_close_unref(3) , sd_bus_flush_close_unrefp(3) , sd_bus_get_address(3) , sd_bus_get_bus_id(3) , sd_bus_get_creds_mask(3) , sd_bus_is_bus_client(3) , sd_bus_is_monitor(3) , sd_bus_is_open(3) , sd_bus_is_ready(3) , sd_bus_is_server(3) , sd_bus_negotiate_creds(3) , sd_bus_negotiate_fds(3) , sd_bus_negotiate_timestamp(3) , sd_bus_new(3) , sd_bus_open(3) , sd_bus_open_system(3) , sd_bus_open_system_machine(3) , sd_bus_open_system_remote(3) , sd_bus_open_system_with_description(3) , sd_bus_open_user(3) , sd_bus_open_user_with_description(3) , sd_bus_open_with_description(3) , sd_bus_ref(3) , sd_bus_set_address(3) , sd_bus_set_bus_client(3) , sd_bus_set_exec(3) , sd_bus_set_monitor(3) , sd_bus_set_server(3) , sd_bus_unref(3) , sd_bus_unrefp(3) , 30-systemd-environment-d-generator(7) , systemd.directives(7) , systemd.index(7)