1 | /* $Id: RTWinPoll.cpp 106061 2024-09-16 14:03:52Z vboxsync $ */
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2 | /** @file
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3 | * NAT Network - poll(2) implementation for winsock.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2013-2024 Oracle and/or its affiliates.
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8 | *
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9 | * This file is part of VirtualBox base platform packages, as
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10 | * available from https://www.virtualbox.org.
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11 | *
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12 | * This program is free software; you can redistribute it and/or
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13 | * modify it under the terms of the GNU General Public License
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14 | * as published by the Free Software Foundation, in version 3 of the
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15 | * License.
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16 | *
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17 | * This program is distributed in the hope that it will be useful, but
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18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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20 | * General Public License for more details.
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21 | *
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22 | * You should have received a copy of the GNU General Public License
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23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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24 | *
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25 | * SPDX-License-Identifier: GPL-3.0-only
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26 | */
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27 | #define LOG_GROUP LOG_GROUP_NAT_SERVICE
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28 |
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29 | #include <iprt/asm.h>
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30 | #include <iprt/assert.h>
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31 | #include <iprt/cdefs.h>
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32 | #include <iprt/errcore.h>
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33 | #include <iprt/string.h>
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34 |
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35 | #include <iprt/errcore.h>
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36 | #include <VBox/log.h>
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37 |
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38 | #include <iprt/win/winsock2.h>
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39 | #include <iprt/win/windows.h>
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40 | #include "winpoll.h"
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41 |
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42 | static HANDLE g_hNetworkEvent;
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43 |
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44 | int
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45 | RTWinPoll(struct pollfd *pFds, unsigned int nfds, int timeout, int *pNready)
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46 | {
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47 | AssertPtrReturn(pFds, VERR_INVALID_PARAMETER);
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48 |
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49 | if (g_hNetworkEvent == WSA_INVALID_EVENT)
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50 | {
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51 | g_hNetworkEvent = WSACreateEvent();
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52 | AssertReturn(g_hNetworkEvent != WSA_INVALID_EVENT, VERR_INTERNAL_ERROR);
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53 | }
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54 |
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55 | for (unsigned int i = 0; i < nfds; ++i)
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56 | {
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57 | long eventMask = 0;
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58 | short pollEvents = pFds[i].events;
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59 |
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60 | /* clean revents */
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61 | pFds[i].revents = 0;
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62 |
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63 | /* ignore invalid sockets */
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64 | if (pFds[i].fd == INVALID_SOCKET)
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65 | continue;
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66 |
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67 | /*
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68 | * POLLIN Data other than high priority data may be read without blocking.
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69 | * This is equivalent to ( POLLRDNORM | POLLRDBAND ).
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70 | * POLLRDBAND Priority data may be read without blocking.
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71 | * POLLRDNORM Normal data may be read without blocking.
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72 | */
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73 | if (pollEvents & POLLIN)
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74 | eventMask |= FD_READ | FD_ACCEPT;
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75 |
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76 | /*
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77 | * POLLOUT Normal data may be written without blocking. This is equivalent
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78 | * to POLLWRNORM.
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79 | * POLLWRNORM Normal data may be written without blocking.
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80 | */
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81 | if (pollEvents & POLLOUT)
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82 | eventMask |= FD_WRITE | FD_CONNECT;
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83 |
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84 | /*
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85 | * This is "moral" equivalent to POLLHUP.
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86 | */
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87 | eventMask |= FD_CLOSE;
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88 | WSAEventSelect(pFds[i].fd, g_hNetworkEvent, eventMask);
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89 | }
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90 |
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91 | DWORD index = WSAWaitForMultipleEvents(1,
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92 | &g_hNetworkEvent,
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93 | FALSE,
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94 | timeout == RT_INDEFINITE_WAIT ? WSA_INFINITE : timeout,
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95 | FALSE);
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96 | if (index != WSA_WAIT_EVENT_0)
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97 | {
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98 | if (index == WSA_WAIT_TIMEOUT)
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99 | return VERR_TIMEOUT;
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100 | }
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101 |
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102 | int nready = 0;
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103 | for (unsigned int i = 0; i < nfds; ++i)
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104 | {
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105 | short revents = 0;
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106 | WSANETWORKEVENTS NetworkEvents;
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107 | int err;
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108 |
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109 | if (pFds[i].fd == INVALID_SOCKET)
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110 | continue;
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111 |
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112 | RT_ZERO(NetworkEvents);
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113 |
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114 | err = WSAEnumNetworkEvents(pFds[i].fd,
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115 | g_hNetworkEvent,
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116 | &NetworkEvents);
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117 |
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118 | if (err == SOCKET_ERROR)
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119 | {
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120 | if (WSAGetLastError() == WSAENOTSOCK)
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121 | {
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122 | pFds[i].revents = POLLNVAL;
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123 | ++nready;
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124 | }
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125 | continue;
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126 | }
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127 |
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128 | /* deassociate socket with event */
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129 | WSAEventSelect(pFds[i].fd, g_hNetworkEvent, 0);
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130 |
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131 | #define WSA_TO_POLL(_wsaev, _pollev) \
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132 | do { \
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133 | if (NetworkEvents.lNetworkEvents & (_wsaev)) { \
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134 | revents |= (_pollev); \
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135 | if (NetworkEvents.iErrorCode[_wsaev##_BIT] != 0) { \
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136 | Log2(("sock %d: %s: %R[sockerr]\n", \
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137 | pFds[i].fd, #_wsaev, \
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138 | NetworkEvents.iErrorCode[_wsaev##_BIT])); \
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139 | revents |= POLLERR; \
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140 | } \
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141 | } \
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142 | } while (0)
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143 |
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144 | WSA_TO_POLL(FD_READ, POLLIN);
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145 | WSA_TO_POLL(FD_ACCEPT, POLLIN);
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146 | WSA_TO_POLL(FD_WRITE, POLLOUT);
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147 | WSA_TO_POLL(FD_CONNECT, POLLOUT);
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148 | WSA_TO_POLL(FD_CLOSE, POLLHUP | (pFds[i].events & POLLIN));
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149 |
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150 | Assert((revents & ~(pFds[i].events | POLLHUP | POLLERR)) == 0);
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151 |
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152 | if (revents != 0)
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153 | {
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154 | pFds[i].revents = revents;
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155 | ++nready;
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156 | }
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157 | }
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158 | WSAResetEvent(g_hNetworkEvent);
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159 |
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160 | if (pNready)
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161 | *pNready = nready;
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162 |
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163 | return VINF_SUCCESS;
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164 | }
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