query on dns resolver

[SIMON BABY]

I was looking at the openssl 1.0.2j code and trying to find how it resolves
the dns domain name IP address from name.

1. Does it use the OS supported utilities like nslookup, gethostip etc?
2. Do we need a recursive dns server IP address to define in resolv.conf?
3. Can I  know the APIs and files where I can start looking (for the dns
resolution).

Thank you for your time.

Regards
Simon
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