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/cdefs.h>
31__FBSDID("$FreeBSD$");
32
33#include <sys/types.h>
34#include <sys/socket.h>
35#include <errno.h>
36#include <poll.h>
37#include <stddef.h>
38#include "libc_private.h"
39
40ssize_t
41recvmmsg(int s, struct mmsghdr *__restrict msgvec, size_t vlen, int flags,
42    const struct timespec *__restrict timeout)
43{
44	struct pollfd pfd[1];
45	size_t i, rcvd;
46	ssize_t ret;
47	int res;
48	short ev;
49
50	if (timeout != NULL) {
51		pfd[0].fd = s;
52		pfd[0].revents = 0;
53		pfd[0].events = ev = POLLIN | POLLRDNORM | POLLRDBAND |
54		    POLLPRI;
55		res = ppoll(&pfd[0], 1, timeout, NULL);
56		if (res == -1 || res == 0)
57			return (res);
58		if (pfd[0].revents & POLLNVAL) {
59			errno = EBADF;
60			return (-1);
61		}
62		if ((pfd[0].revents & ev) == 0) {
63			errno = ETIMEDOUT;
64			return (-1);
65		}
66	}
67
68	ret = __sys_recvmsg(s, &msgvec[0].msg_hdr, flags);
69	if (ret == -1)
70		return (ret);
71
72	msgvec[0].msg_len = ret;
73
74	/*
75	 * Do non-blocking receive for second and later messages if
76	 * WAITFORONE is set.
77	 */
78	if (flags & MSG_WAITFORONE)
79		flags |= MSG_DONTWAIT;
80
81	rcvd = 1;
82	for (i = rcvd; i < vlen; i++, rcvd++) {
83		ret = __sys_recvmsg(s, &msgvec[i].msg_hdr, flags);
84		if (ret == -1) {
85			/* We have received messages. Let caller know
86			 * about the data received, socket error is
87			 * returned on next invocation.
88			 */
89			return (rcvd);
90		}
91
92		/* Save received bytes. */
93		msgvec[i].msg_len = ret;
94	}
95
96	return (rcvd);
97}
98