1SD_BUS_MESSAGE_SET_EXPECTs_dR_EbPuLsY_(m3e)ssage_set_exSpDe_cBtU_Sr_eMpElSySAGE_SET_EXPECT_REPLY(3)
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NAME

6       sd_bus_message_set_expect_reply, sd_bus_message_get_expect_reply,
7       sd_bus_message_set_auto_start, sd_bus_message_get_auto_start - Set and
8       query bus message metadata
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SYNOPSIS

11       #include <systemd/sd-bus.h>
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13       int sd_bus_message_set_expect_reply(sd_bus_message *message, int b);
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15       int sd_bus_message_get_expect_reply(sd_bus_message *message);
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17       int sd_bus_message_set_auto_start(sd_bus_message *message, int b);
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19       int sd_bus_message_get_auto_start(sd_bus_message *message);
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DESCRIPTION

22       sd_bus_message_set_expect_reply() sets or clears the NO_REPLY_EXPECTED
23       flag on the message m. This flag matters only for method call messages
24       and is used to specify that no method return or error reply is
25       expected. It is ignored for other types. Thus, for a method call
26       message, calling
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28           sd_bus_message_set_expect_reply(..., 0)
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30       sets the flag and suppresses the reply.
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32       sd_bus_message_get_expect_reply() checks if the NO_REPLY_EXPECTED flag
33       is set on the message m. It will return positive if it is not set, and
34       zero if it is.
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36       sd_bus_message_set_auto_start() sets or clears the NO_AUTO_START flag
37       on the message m. When the flag is set the bus must not launch an owner
38       for the destination name in response to this message. Calling
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40           sd_bus_message_set_auto_start(..., 0)
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42       sets the flag.
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44       sd_bus_message_get_auto_start() checks if the NO_AUTO_START flag is set
45       on the message m. It will return positive if it is not set, and zero if
46       it is.
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RETURN VALUE

49       On success, these functions return 0 or a positive integer. On failure,
50       they return a negative errno-style error code.
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52   Errors
53       Returned errors may indicate the following problems:
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55       -EINVAL
56           The message parameter is NULL.
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58       -EPERM
59           The message message is sealed when trying to set a flag.
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61           The message message has wrong type.
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NOTES

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

68       systemd(1), sd-bus(3), sd_bus_set_description(3)
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72systemd 243                                 SD_BUS_MESSAGE_SET_EXPECT_REPLY(3)
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