SD_BUS_MESSAGE_GET_COOKIE - Online Linux Manual PageSection : 3
Updated :
Source : systemd 250
Note : sd_bus_message_get_cookie

NAMEsd_bus_message_get_cookie, sd_bus_message_get_reply_cookie − Returns the transaction cookie of a message

SYNOPSIS#include <systemd/sd−bus​.h>int sd_bus_message_get_cookie(sd_bus_message *message, uint64_t *cookie); int sd_bus_message_get_reply_cookie(sd_bus_message *message, uint64_t *cookie);

DESCRIPTIONsd_bus_message_get_cookie() returns the transaction cookie of a message​. The cookie uniquely identifies a message within each bus peer, but is not globally unique​. It is assigned when a message is sent​. sd_bus_message_get_reply_cookie() returns the transaction cookie of the message the specified message is a response to​. When a reply message is generated for a method call message, its cookie is copied over into this field​. Note that while every message that is transferred is identified by a cookie, only response messages carry a reply cookie field​. Both functions take a message object as first parameter and a place to store the 64−bit cookie in​.

RETURN VALUEOn success, these calls return 0 or a positive integer​. On failure, they return a negative errno−style error code​. On success, the cookie/reply cookie is returned in the specified 64−bit unsigned integer variable​.

ErrorsReturned errors may indicate the following problems: −EINVAL A specified parameter is invalid​. −ENODATA No cookie has been assigned to this message​. This either indicates that the message has not been sent yet and hence has no cookie assigned, or that the message is not a method response message and hence carries a reply cookie field​.

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

SEE ALSOsystemd(1), sd-bus(3), sd_bus_new(3)
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