qt5base-lts/config.tests/unix/getaddrinfo/getaddrinfotest.cpp

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/* Sample program for configure to test for getaddrinfo on the unix
     platform. we check for all structures and functions required. */

#include <stdio.h>
#include <stdlib.h>
#ifdef __MINGW32__
#include <winsock2.h>
#include <ws2tcpip.h>
#else
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#endif

int main()
{
    addrinfo *res = 0;
    if (getaddrinfo("foo", 0, 0, &res) == 0)
        freeaddrinfo(res);
    gai_strerror(0);

    return 0;
}