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