1/*
2 * Copyright (c) 2016 Boris Astardzhiev, Smartcom-Bulgaria AD
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice(s), this list of conditions and the following disclaimer as
10 *    the first lines of this file unmodified other than the possible
11 *    addition of one or more copyright notices.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice(s), this list of conditions and the following disclaimer in
14 *    the documentation and/or other materials provided with the
15 *    distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
20 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
21 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
24 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
26 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
27 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30#include <sys/types.h>
31#include <sys/socket.h>
32#include <errno.h>
33#include <poll.h>
34#include <stddef.h>
35#include "libc_private.h"
36
37ssize_t
38recvmmsg(int s, struct mmsghdr *__restrict msgvec, size_t vlen, int flags,
39    const struct timespec *__restrict timeout)
40{
41	struct pollfd pfd[1];
42	size_t i, rcvd;
43	ssize_t ret;
44	int res;
45	short ev;
46
47	if (timeout != NULL) {
48		pfd[0].fd = s;
49		pfd[0].revents = 0;
50		pfd[0].events = ev = POLLIN | POLLRDNORM | POLLRDBAND |
51		    POLLPRI;
52		res = ppoll(&pfd[0], 1, timeout, NULL);
53		if (res == -1 || res == 0)
54			return (res);
55		if (pfd[0].revents & POLLNVAL) {
56			errno = EBADF;
57			return (-1);
58		}
59		if ((pfd[0].revents & ev) == 0) {
60			errno = ETIMEDOUT;
61			return (-1);
62		}
63	}
64
65	ret = __sys_recvmsg(s, &msgvec[0].msg_hdr, flags);
66	if (ret == -1)
67		return (ret);
68
69	msgvec[0].msg_len = ret;
70
71	/*
72	 * Do non-blocking receive for second and later messages if
73	 * WAITFORONE is set.
74	 */
75	if (flags & MSG_WAITFORONE)
76		flags |= MSG_DONTWAIT;
77
78	rcvd = 1;
79	for (i = rcvd; i < vlen; i++, rcvd++) {
80		ret = __sys_recvmsg(s, &msgvec[i].msg_hdr, flags);
81		if (ret == -1) {
82			/* We have received messages. Let caller know
83			 * about the data received, socket error is
84			 * returned on next invocation.
85			 */
86			return (rcvd);
87		}
88
89		/* Save received bytes. */
90		msgvec[i].msg_len = ret;
91	}
92
93	return (rcvd);
94}
95