source: rtems/cpukit/libnetworking/libc/getnameinfo.c @ 0e16fa45

#include <machine/rtems-bsd-user-space.h>

/*
 * Copyright (c) 2016 embedded brains GmbH.  All rights reserved.
 *
 *  embedded brains GmbH
 *  Dornierstr. 4
 *  82178 Puchheim
 *  Germany
 *  <rtems@embedded-brains.de>
 *
 * The license and distribution terms for this file may be
 * found in the file LICENSE in this distribution or at
 * http://www.rtems.org/license/LICENSE.
 */

#include <netdb.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdio.h>

int
getnameinfo(const struct sockaddr *sa, socklen_t salen, char *node,
    size_t nodelen, char *service, size_t servicelen, int flags)
{
        int af;
        const struct sockaddr_in *sa_in = (const struct sockaddr_in *)sa;

        (void) salen;

        af = sa->sa_family;
        if (af != AF_INET) {
                return EAI_FAMILY;
        }

        if ((flags & NI_NAMEREQD) != 0) {
                return EAI_NONAME;
        }

        /* FIXME: This return just the address value. Try resolving instead. */
        if (node != NULL && nodelen > 0) {
                if (inet_ntop(af, &sa_in->sin_addr, node, nodelen) == NULL) {
                        return EAI_FAIL;
                }
        }

        if (service != NULL && servicelen > 0) {
                in_port_t port = ntohs(sa_in->sin_port);
                int rv;

                rv = snprintf(service, servicelen, "%u", port);
                if (rv <= 0) {
                        return EAI_FAIL;
                } else if ((unsigned)rv >= servicelen) {
                        return EAI_OVERFLOW;
                }
        }

        return 0;
}