Greetings!
I use c-ares library to look up the hostname for a given IP address. Following is the sequence of operations in my code.
1. Call ares_init to initialize the channel
2. Call ares_gethostbyaddr, passing all the required arguments including the callback
3. Define my fd_set and FD_ZERO it
* fd_set readers; FD_ZERO(&readers);
4. Call ares_fds to get the FDs that I can wait
Everything works fine almost all the time. But occasionally I ares_fds() function returns zero. No callback function is invoked. No other way of tracking what went wrong.
Is this expected ? What does it mean ? Should I treat it as an error ?
Thanks
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Received on 2016-06-18