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Why include multiple headers for a single POSIX function?

According to the man page getaddrinfo(3)I need

#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>

use function getaddrinfo. Or, according to the standard :

#include <sys/socket.h>
#include <netdb.h>

I understand, I need things like AF_INETand SOCK_STEAMfrom <sys/socket.h>. But I still have the following questions.

Suppose I will only use a function getaddrinfo, should I have a #include <sys/socket.h>standard match? If so, why <netdb.h>not include it yourself? If not, why does this man page contain a summary of it?

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Source: https://habr.com/ru/post/1650107/

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