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
40 ssize_t
recvmmsg(int s,struct mmsghdr * __restrict msgvec,size_t vlen,int flags,const struct timespec * __restrict timeout)41 recvmmsg(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