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 - Set and query bus message
       metadata

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);

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.

RETURN VALUE

       On success, these functions return 0 or a positive 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.

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_set_description(3)