NAME

       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

SYNOPSIS

       #include <systemd/sd-bus.h>

       typedef int (*sd_bus_message_handler_t)(sd_bus_message *m, void *userdata,
                                               sd_bus_error *ret_error);

       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 **reply, 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 **reply,
                               const char *types, va_list ap);

       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 ap);

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.

NOTES

       These APIs are implemented as a shared library, which can be compiled and linked to with
       the libsystemd pkg-config(1) file.

SEE ALSO

       systemd(1), sd-bus(3), sd_bus_message_new_method_call(3), sd_bus_message_append(3),
       sd_bus_call(3), sd_bus_set_property(3), sd_bus_emit_signal(3)