SD_BUS_MESSAGE_GET_SIGNATURE - Online Linux Manual PageSection : 3
Updated :
Source : systemd 250
Note : sd_bus_message_get_signature

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NAMEsd_bus_message_get_signature, sd_bus_message_is_empty, sd_bus_message_has_signature − Query bus message signature

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SYNOPSIS#include <systemd/sd−bus​.h>const char* sd_bus_message_get_signature(sd_bus_message *message, int complete); int sd_bus_message_is_empty(sd_bus_message *message); int sd_bus_message_has_signature(sd_bus_message *message, const char *signature);

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DESCRIPTIONsd_bus_message_get_signature() returns the signature of message message​. If complete is true, the signature of the whole message is returned, and just the signature of the currently open container otherwise​. sd_bus_message_is_empty() returns true if the message is empty, i​.e​. when its signature is empty​. sd_bus_message_has_signature() returns true if the signature of the message message matches given signature​. Parameter signature may be NULL, this is treated the same as an empty string, which is equivalent to calling sd_bus_message_is_empty()​.

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RETURN VALUEOn success, sd_bus_message_get_signature() returns the signature, and NULL on error​. The other functions return 0 or a positive integer on success​. On failure, they return a negative errno−style error code​.

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ErrorsReturned errors may indicate the following problems: −EINVAL The message parameter is NULL​. NULL The message parameter is NULL​.

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NOTESThese APIs are implemented as a shared library, which can be compiled and linked to with the libsystemd ​pkg-config(1) file​.

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SEE ALSOsystemd(1), sd-bus(3), sd_bus_message_new(3) 0

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