sd_bus_message_set_expect_reply

systemd
sd_bus_message_set_expect_reply 3
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

    #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.

## See Also

systemd 1, sd-bus 3, sd_bus_set_description 3