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   sd_bus_message_set_expect_reply    ( 3 )

установка и запрос метаданных сообщения шины (set and query bus message metadata)

Имя (Name)

sd_bus_message_set_expect_reply, sd_bus_message_get_expect_reply,
       sd_bus_message_set_auto_start, sd_bus_message_get_auto_start,
       sd_bus_message_set_allow_interactive_authorization,
       sd_bus_message_get_allow_interactive_authorization - Set and
       query bus message metadata

Синопсис (Synopsis)

#include <systemd/sd-bus.h>

int sd_bus_message_set_expect_reply(sd_bus_message *message, int b);

int sd_bus_message_get_expect_reply(sd_bus_message *message);

int sd_bus_message_set_auto_start(sd_bus_message *message, int b);

int sd_bus_message_get_auto_start(sd_bus_message *message);

int sd_bus_message_set_allow_interactive_authorization(sd_bus_message *message, int b);

int sd_bus_message_get_allow_interactive_authorization(sd_bus_message *message);


Описание (Description)

sd_bus_message_set_expect_reply() sets or clears the
       NO_REPLY_EXPECTED flag on the message m. This flag matters only
       for method call messages and is used to specify that no method
       return or error reply is expected. It is ignored for other types.
       Thus, for a method call message, calling

sd_bus_message_set_expect_reply(..., 0)

sets the flag and suppresses the reply.

sd_bus_message_get_expect_reply() checks if the NO_REPLY_EXPECTED flag is set on the message m. It will return positive if it is not set, and zero if it is.

sd_bus_message_set_auto_start() sets or clears the NO_AUTO_START flag on the message m. When the flag is set, the bus must not launch an owner for the destination name in response to this message. Calling

sd_bus_message_set_auto_start(..., 0)

sets the flag.

sd_bus_message_get_auto_start() checks if the NO_AUTO_START flag is set on the message m. It will return positive if it is not set, and zero if it is.

sd_bus_message_set_allow_interactive_authorization() sets or clears the ALLOW_INTERACTIVE_AUTHORIZATION flag on the message m. Setting this flag informs the receiver that the caller is prepared to wait for interactive authorization via polkit or a similar framework. Note that setting this flag does not guarantee that the receiver will actually perform interactive authorization. Also, make sure to set a suitable message timeout when using this flag since interactive authorization could potentially take a long time as it depends on user input. If b is non-zero, the flag is set.

sd_bus_message_get_allow_interactive_authorization() checks if the ALLOW_INTERACTIVE_AUTHORIZATION flag is set on the message m. It will return a positive integer if the flag is set. Otherwise, it returns zero.


Возвращаемое значение (Return value)

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

Errors Returned errors may indicate the following problems:

-EINVAL The message parameter is NULL.

-EPERM The message message is sealed when trying to set a flag.

The message message has wrong type.


Примечание (Note)

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

Смотри также (See also)

systemd(1), sd-bus(3), sd_bus_set_description(3)