lib: create a transparent union sockunion
#14736
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About to use this for sockunion, which is not a prefix. `uniontype` makes more sense, the macros are for defining transparent unions after all. (clang-format off thrown in as it otherwise wrecks formatting.) Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
As with "prefixptr"/"prefixconstptr", this allows function prototypes to say "just give me any sockaddr" typing-wise, without having the compiler complain that a "struct sockaddr_in" is not a "struct sockaddr". (Split off from other changes that start using this.) Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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This is GCC extension magic, it allows defining functions that accept different types of arguments. We already have
prefixptr(acceptsstruct prefix *,struct prefix_ipv4 *etc.), this adds one that accepts the variousstruct sockaddr_… *