sd_bus_call_method

systemd

sd_bus_call_method

sd_bus_call_methodv

sd_bus_call_method_async

sd_bus_call_method_asyncv

Initialize a bus message object and invoke the corresponding D-Bus method call

#include <systemd/sd-bus.h>

int

sd_bus_call_method

sd_bus *

bus

const char *

destination

const char *

path

const char *

interface

const char *

member

sd_bus_error *

ret_error

sd_bus_message **

const char *

types

...

int

sd_bus_call_methodv

sd_bus *

bus

const char *

destination

const char *

path

const char *

interface

const char *

member

sd_bus_error *

ret_error

sd_bus_message **

const char *

types

va_list

int

sd_bus_call_method_async

sd_bus *

bus

sd_bus_slot **

slot

const char *

destination

const char *

path

const char *

interface

const char *

member

sd_bus_message_handler_t

callback

void *

userdata

const char *

types

...

int

sd_bus_call_method_asyncv

sd_bus *

bus

sd_bus_slot **

slot

const char *

destination

const char *

path

const char *

interface

const char *

member

sd_bus_message_handler_t

callback

void *

userdata

const char *

types

va_list

Description

sd_bus_call_method() is a convenience function for initializing a bus message object and calling the corresponding D-Bus method. It combines the sd_bus_message_new_method_call(3), sd_bus_message_append(3) and sd_bus_call(3) functions into a single function call.

sd_bus_call_method_async() is a convenience function for initializing a bus message object and calling the corresponding D-Bus method asynchronously. It combines the sd_bus_message_new_method_call(3), sd_bus_message_append(3) and sd_bus_call_async(3) functions into a single function call.

Return Value

On success, these functions return a non-negative integer. On failure, they return a negative errno-style error code.

Errors

See the man pages of sd_bus_message_new_method_call(3), sd_bus_message_append(3), sd_bus_call(3) and sd_bus_call_async(3) for a list of possible errors.

Examples

Make a call to a D-Bus method that takes a single parameter

This defines a minimally useful program that will open a connection to the bus, call a method, wait for the reply, and finally extract and print the answer. It does error handling and proper memory management.

History

sd_bus_call_method(), and sd_bus_call_method_async() were added in version 221.

sd_bus_call_methodv(), sd_bus_call_method_asyncv() were added in version 246.