1SD_BUS_MESSAGE_GET_SIGNATUsRdE_(b3u)s_message_get_signSaDt_uBrUeS_MESSAGE_GET_SIGNATURE(3)
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NAME

6       sd_bus_message_get_signature, sd_bus_message_is_empty,
7       sd_bus_message_has_signature - Query bus message signature
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SYNOPSIS

10       #include <systemd/sd-bus.h>
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12       const char* sd_bus_message_get_signature(sd_bus_message *message,
13                                                int complete);
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15       int sd_bus_message_is_empty(sd_bus_message *message);
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17       int sd_bus_message_has_signature(sd_bus_message *message,
18                                        const char *signature);
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DESCRIPTION

21       sd_bus_message_get_signature() returns the signature of message
22       message. If complete is true, the signature of the whole message is
23       returned, and just the signature of the currently open container
24       otherwise.
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26       sd_bus_message_is_empty() returns true if the message is empty, i.e.
27       when its signature is empty.
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29       sd_bus_message_has_signature() returns true if the signature of the
30       message message matches given signature. Parameter signature may be
31       NULL, this is treated the same as an empty string, which is equivalent
32       to calling sd_bus_message_is_empty().
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RETURN VALUE

35       On success, sd_bus_message_get_signature() returns the signature, and
36       NULL on error.
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38       The other functions return 0 or a positive integer on success. On
39       failure, they return a negative errno-style error code.
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41   Errors
42       Returned errors may indicate the following problems:
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44       -EINVAL
45           The message parameter is NULL.
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47       NULL
48           The message parameter is NULL.
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NOTES

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

55       systemd(1), sd-bus(3), sd_bus_message_new(3)
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59systemd 243                                    SD_BUS_MESSAGE_GET_SIGNATURE(3)
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