Call back function in c programming

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I'm currently developing a zigbee stack . Have a lot of basic doubts in C .

void zb_mlme_get_request(zb_uint8_t param) ZB_CALLBACK;

I dont understand the above mentioned prototype .

I do understand this is a void function .

zb_uint8_t

is nothing but a typedef for unsigned char. Char is a parameter . My doubt is what it means when you add

ZB_CALLBACK

after parameters .

ZB_CALLBACK

is my doubt . Can anyone guide me ?

Posted 21-Dec-12 2:58am

steven8Gerrard

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Fredrik Bornander 21-Dec-12 9:45am

Can you see what the ZB_CALLBACK macro does? I'm guessing it's just a marker so that they know what is callbacks.

Jochen Arndt 21-Dec-12 9:53am

Can't help you really but all uppercase letters is usally a definition. Have a look in the API header files. It must be defined somewhere.

steven8Gerrard 21-Dec-12 10:11am

have searched it cant find the macro. It is not defined as far i know . say if i have defined. What it means? Does it link? What the macro does here?

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Mike Hankey · Answer 1 · 2012-12-21T11:14:00

Solution 1

Check out the API information here[^].
ZB_CALLBACK is a macro set up to allow you to define a C callback function when I'm assuming a request of some kind is made.

Posted 21-Dec-12 11:14am

Mike Hankey