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65f438471b
Commit 5579388d removed code that supplied a fallback implementation of getaddrinfo(), which was dead code on modern systems. One tiny piece of the removed code was still doing something useful on Windows, though: that OS's own gai_strerror()/gai_strerrorA() function returns a pointer to a static buffer that it overwrites each time, so it's not thread-safe. In rare circumstances, a multi-threaded client program could get an incorrect or corrupted error message. Restore the replacement gai_strerror() function, though now that it's only for Windows we can put it into a win32-specific file and cut it down to the errors that Windows documents. The error messages here are taken from FreeBSD, because Windows' own messages seemed too verbose. Back-patch to 16. Reviewed-by: Kyotaro Horiguchi <horikyota.ntt@gmail.com> Discussion: https://postgr.es/m/CA%2BhUKGKz%2BF9d2PTiXwfYV7qJw%2BWg2jzACgSDgPizUw7UG%3Di58A%40mail.gmail.com