/*
 * Copyright (c) 2016 Boris Astardzhiev, Smartcom-Bulgaria AD
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice(s), this list of conditions and the following disclaimer as
 *    the first lines of this file unmodified other than the possible
 *    addition of one or more copyright notices.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice(s), this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/types.h>
#include <sys/socket.h>
#include <errno.h>
#include <poll.h>
#include <stddef.h>
#include <ssp/ssp.h>
#include "libc_private.h"

ssize_t
__ssp_real(recvmmsg)(int s, struct mmsghdr *__restrict msgvec, size_t vlen,
    int flags, const struct timespec *__restrict timeout)
{
        struct pollfd pfd[1];
        size_t i, rcvd;
        ssize_t ret;
        int res;
        short ev;

        if (timeout != NULL) {
                pfd[0].fd = s;
                pfd[0].revents = 0;
                pfd[0].events = ev = POLLIN | POLLRDNORM | POLLRDBAND |
                    POLLPRI;
                res = ppoll(&pfd[0], 1, timeout, NULL);
                if (res == -1 || res == 0)
                        return (res);
                if (pfd[0].revents & POLLNVAL) {
                        errno = EBADF;
                        return (-1);
                }
                if ((pfd[0].revents & ev) == 0) {
                        errno = ETIMEDOUT;
                        return (-1);
                }
        }

        ret = __sys_recvmsg(s, &msgvec[0].msg_hdr, flags);
        if (ret == -1)
                return (ret);

        msgvec[0].msg_len = ret;

        /* 
         * Do non-blocking receive for second and later messages if
         * WAITFORONE is set.
         */
        if (flags & MSG_WAITFORONE)
                flags |= MSG_DONTWAIT;

        rcvd = 1;
        for (i = rcvd; i < vlen; i++, rcvd++) {
                ret = __sys_recvmsg(s, &msgvec[i].msg_hdr, flags);
                if (ret == -1) {
                        /* We have received messages. Let caller know
                         * about the data received, socket error is
                         * returned on next invocation.
                         */
                        return (rcvd);
                }

                /* Save received bytes. */
                msgvec[i].msg_len = ret;
        }

        return (rcvd);
}