>Okay so this means, you would prefer my proposed solution #1? 
>That was my inclination too.  

Proposed solution #1 without the errno check.

My idea :

get the service code in a loop 

for (i = 0; i < RETRIES; i++) {

        if (send_request() < 0)
                continue;

        if (read_reply() == 0)
                break;
}
        


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