Isn't struct sockadr_in supposed to work for both IPv4 and IPv6?

Question

Specifically sin_addr seems to be located on different memory locations for IPv4 and IPv6 socket addressed. This results in weirdness:

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Answer 1

No, for ipv6 you need to use

in6_addr // is used to store the 128-bit network address

and

sockaddr_in6

Details can be referenced here

For writing code which supports dual stack i.e. ipv4 and 6 along use this