|
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | NOTES | SEE ALSO | NOTES | COLOPHON |
SD_BUS_SET_SERVER(3) sd_bus_set_server SD_BUS_SET_SERVER(3)
sd_bus_set_server, sd_bus_is_server, sd_bus_get_bus_id,
sd_bus_set_bus_client, sd_bus_is_bus_client, sd_bus_set_monitor,
sd_bus_is_monitor - Configure connection mode for a bus object
#include <systemd/sd-bus.h>
int sd_bus_set_server(sd_bus *bus, int b, sd_id128_t id);
int sd_bus_is_server(sd_bus *bus);
int sd_bus_get_bus_id(sd_bus *bus, sd_id128_t *id);
int sd_bus_set_bus_client(sd_bus *bus, int b);
int sd_bus_is_bus_client(sd_bus *bus);
int sd_bus_set_monitor(sd_bus *bus, int b);
int sd_bus_is_monitor(sd_bus *bus);
sd_bus_set_server() configures the bus object as a server for direct
D-Bus connections. b enables/disables the server mode. If zero, the
server mode is disabled. Otherwise, the server mode is enabled.
Configuring a bus object as a server is required to allow
establishing direct connections between two peers without going via
the D-Bus daemon. id must contain a 128-bit integer id for the
server. If clients add a guid field to their D-Bus address string,
the server id must match this guid or the D-Bus authentication
handshake will fail. If no specific id is defined for the server,
sd_id128_randomize(3) can be used to generate a random id instead.
sd_bus_is_server() returns whether the server mode is enabled for the
given bus object.
sd_bus_get_bus_id() stores the D-Bus server id configured using
sd_bus_set_server() (for server bus objects) or received during D-Bus
authentication (for client bus objects) in id.
sd_bus_set_bus_client() configures the bus object as a D-Bus daemon
client. b enables/disables the client mode. If zero, the client mode
is disabled and the bus object should connect directly to a D-Bus
server. Otherwise, the client mode is enabled and the bus object
should connect to a D-Bus daemon. When connecting to an existing bus
using any of the functions in the sd_bus_open(3) family of functions
or any of the functions in the sd_bus_default(3) family of functions,
the bus object is automatically configured as a bus client. However,
when connecting to a D-Bus daemon by calling sd_bus_set_address(3)
followed by sd_bus_start(3), the bus object should be manually
configured as a bus client using sd_bus_set_bus_client(). By default,
a bus object is not configured as a D-Bus daemon client.
sd_bus_is_bus_client() returns whether the client mode is
enabled/disabled for the given bus object.
sd_bus_set_monitor() configures the bus object as a D-Bus monitor
object. b enables/disables the monitor mode. If zero, the monitor
mode is disabled. If non-zero, the monitor mode is enabled. When the
monitor mode is enabled, no messages may be sent via the bus object
and it may not expose any objects on the bus. To start monitoring
messages, call the org.freedesktop.DBus.Monitoring.BecomeMonitor
method of the D-Bus daemon and pass a list of matches indicating
which messages to intercept. See The D-Bus specification[1] for more
information.
sd_bus_is_monitor() returns whether the monitor mode is
enabled/disabled for the given bus object.
On success, sd_bus_set_server(), sd_bus_get_bus_id(),
sd_bus_set_bus_client() and sd_bus_set_monitor() return a
non-negative integer. On failure, they return a negative errno-style
error code.
sd_bus_is_server(), sd_bus_is_bus_client() and sd_bus_is_monitor()
return a positive integer when the server or client mode is enabled,
respectively. Otherwise, they return zero.
Errors
Returned errors may indicate the following problems:
-ECHILD
The bus connection has been created in a different process.
-EPERM
The bus connection has already been started.
-ENOPKG
The bus cannot be resolved.
-EINVAL
A required parameter was NULL or b was zero and id did not equal
SD_ID128_NULL.
-ENOTCONN
The bus is not connected.
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)
1. The D-Bus specification
https://dbus.freedesktop.org/doc/dbus-specification.html#bus-messages-become-monitor
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
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 246 SD_BUS_SET_SERVER(3)
Pages that refer to this page: sd-bus(3) , 30-systemd-environment-d-generator(7) , systemd.directives(7) , systemd.index(7)