sd_bus_set_address, sd_bus_get_address, sd_bus_set_exec - Set or query the
address of the bus connection
int sd_bus_set_address(sd_bus *bus,
const char *address);
int sd_bus_get_address(sd_bus *bus,
const char **address);
int sd_bus_set_exec(sd_bus *bus,
const char *path,
char *const *argv);
sd_bus_set_address() configures a list of addresses of bus brokers to try
to connect to from a subsequent sd_bus_start(3) call. The argument is a
";"-separated list of addresses to try. Each item must be one of the
•A unix socket address specified as
"unix:guid=guid,abstract=path". Exactly one of the
path= and abstract= keys must be present, while guid= is
•A TCP socket address specified as
One or both of the host= and port= keys must be present, while
the rest is optional. family may be either ipv4 or
•An executable to spawn specified as
The path= key must be present, while guid= is optional.
•A machine (container) to connect to specified as
Exactly one of the machine=
keys must be present, while
is optional. machine
is the name of a local container. See
for more information about the "machine"
concept. "machine=.host" may be used to specify the host machine. A
connection to the standard system bus socket inside of the specified machine
will be created.
In all cases, parameter guid is an identifier of the remote
peer, in the syntax accepted by sd_id128_from_string(3). If
specified, the identifier returned by the peer after the connection is
established will be checked and the connection will be rejected in case of a
Note that the addresses passed to sd_bus_set_address() may
not be verified immediately. If they are invalid, an error may be returned
e.g. from a subsequent call to sd_bus_start(3).
sd_bus_get_address() returns any previously set addresses.
In addition to being explicitly set by sd_bus_set_address(), the
address will also be set automatically by sd_bus_open(3) and similar
calls, based on environment variables or built-in defaults.
sd_bus_set_exec() is a shorthand function for setting a
"unixexec" address that spawns the given executable with the given
arguments. If argv is NULL, the given executable is spawned
without any extra arguments.
On success, these functions return a non-negative integer. On failure, they
return a negative errno-style error code.
Returned errors may indicate the following problems:
The input parameters bus or address are
The bus object bus could not be resolved.
The input parameter bus is in a wrong state
(sd_bus_set_address() may only be called once on a newly-created bus
The bus object bus was created in a different
The bus object bus has no address
These APIs are implemented as a shared library, which can be compiled and linked
to with the libsystemd pkg-config(1) file.