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 37 ssize_t 38 recvmmsg(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