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/* $Id: RTWinPoll.cpp $ */
/** @file
* NAT Network - poll(2) implementation for winsock.
*/
/*
* Copyright (C) 2013-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* SPDX-License-Identifier: GPL-3.0-only
*/
#define LOG_GROUP LOG_GROUP_NAT_SERVICE
#include <iprt/asm.h>
#include <iprt/assert.h>
#include <iprt/cdefs.h>
#include <iprt/errcore.h>
#include <iprt/string.h>
#include <iprt/errcore.h>
#include <VBox/log.h>
#include <iprt/win/winsock2.h>
#include <iprt/win/windows.h>
#include "winpoll.h"
static HANDLE g_hNetworkEvent;
int
RTWinPoll(struct pollfd *pFds, unsigned int nfds, int timeout, int *pNready)
{
AssertPtrReturn(pFds, VERR_INVALID_PARAMETER);
if (g_hNetworkEvent == WSA_INVALID_EVENT)
{
g_hNetworkEvent = WSACreateEvent();
AssertReturn(g_hNetworkEvent != WSA_INVALID_EVENT, VERR_INTERNAL_ERROR);
}
for (unsigned int i = 0; i < nfds; ++i)
{
long eventMask = 0;
short pollEvents = pFds[i].events;
/* clean revents */
pFds[i].revents = 0;
/* ignore invalid sockets */
if (pFds[i].fd == INVALID_SOCKET)
continue;
/*
* POLLIN Data other than high priority data may be read without blocking.
* This is equivalent to ( POLLRDNORM | POLLRDBAND ).
* POLLRDBAND Priority data may be read without blocking.
* POLLRDNORM Normal data may be read without blocking.
*/
if (pollEvents & POLLIN)
eventMask |= FD_READ | FD_ACCEPT;
/*
* POLLOUT Normal data may be written without blocking. This is equivalent
* to POLLWRNORM.
* POLLWRNORM Normal data may be written without blocking.
*/
if (pollEvents & POLLOUT)
eventMask |= FD_WRITE | FD_CONNECT;
/*
* This is "moral" equivalent to POLLHUP.
*/
eventMask |= FD_CLOSE;
WSAEventSelect(pFds[i].fd, g_hNetworkEvent, eventMask);
}
DWORD index = WSAWaitForMultipleEvents(1,
&g_hNetworkEvent,
FALSE,
timeout == RT_INDEFINITE_WAIT ? WSA_INFINITE : timeout,
FALSE);
if (index != WSA_WAIT_EVENT_0)
{
if (index == WSA_WAIT_TIMEOUT)
return VERR_TIMEOUT;
}
int nready = 0;
for (unsigned int i = 0; i < nfds; ++i)
{
short revents = 0;
WSANETWORKEVENTS NetworkEvents;
int err;
if (pFds[i].fd == INVALID_SOCKET)
continue;
RT_ZERO(NetworkEvents);
err = WSAEnumNetworkEvents(pFds[i].fd,
g_hNetworkEvent,
&NetworkEvents);
if (err == SOCKET_ERROR)
{
if (WSAGetLastError() == WSAENOTSOCK)
{
pFds[i].revents = POLLNVAL;
++nready;
}
continue;
}
/* deassociate socket with event */
WSAEventSelect(pFds[i].fd, g_hNetworkEvent, 0);
#define WSA_TO_POLL(_wsaev, _pollev) \
do { \
if (NetworkEvents.lNetworkEvents & (_wsaev)) { \
revents |= (_pollev); \
if (NetworkEvents.iErrorCode[_wsaev##_BIT] != 0) { \
Log2(("sock %d: %s: %R[sockerr]\n", \
pFds[i].fd, #_wsaev, \
NetworkEvents.iErrorCode[_wsaev##_BIT])); \
revents |= POLLERR; \
} \
} \
} while (0)
WSA_TO_POLL(FD_READ, POLLIN);
WSA_TO_POLL(FD_ACCEPT, POLLIN);
WSA_TO_POLL(FD_WRITE, POLLOUT);
WSA_TO_POLL(FD_CONNECT, POLLOUT);
WSA_TO_POLL(FD_CLOSE, POLLHUP | (pFds[i].events & POLLIN));
Assert((revents & ~(pFds[i].events | POLLHUP | POLLERR)) == 0);
if (revents != 0)
{
pFds[i].revents = revents;
++nready;
}
}
WSAResetEvent(g_hNetworkEvent);
if (pNready)
*pNready = nready;
return VINF_SUCCESS;
}
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