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)
