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258 lines (229 loc) · 7.22 KB
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//
// Socket.cpp
//
// $Id: //poco/1.3/Net/src/Socket.cpp#4 $
//
// Library: Net
// Package: Sockets
// Module: Socket
//
// Copyright (c) 2005-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
//
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//
#include "Poco/Net/Socket.h"
#include "Poco/Net/StreamSocketImpl.h"
#include "Poco/Timestamp.h"
#include <algorithm>
#include <string.h> // FD_SET needs memset on some platforms, so we can't use <cstring>
#if defined(POCO_HAVE_FD_POLL)
#include "Poco/SharedPtr.h"
#include <poll.h>
typedef Poco::SharedPtr<pollfd,
Poco::ReferenceCounter,
Poco::ReleaseArrayPolicy<pollfd> > SharedPollArray;
#endif
namespace Poco {
namespace Net {
Socket::Socket():
_pImpl(new StreamSocketImpl)
{
}
Socket::Socket(SocketImpl* pImpl):
_pImpl(pImpl)
{
poco_check_ptr (_pImpl);
}
Socket::Socket(const Socket& socket):
_pImpl(socket._pImpl)
{
poco_check_ptr (_pImpl);
_pImpl->duplicate();
}
Socket& Socket::operator = (const Socket& socket)
{
if (&socket != this)
{
if (_pImpl) _pImpl->release();
_pImpl = socket._pImpl;
if (_pImpl) _pImpl->duplicate();
}
return *this;
}
Socket::~Socket()
{
_pImpl->release();
}
int Socket::poll(SocketList& readList, SocketList& writeList, SocketList& exceptList, const Poco::Timespan& timeout)
{
#if !defined(POCO_HAVE_FD_POLL)
throw NotImplementedException("poll() is only available on POSIX platforms");
#else
nfds_t nfd = readList.size() + writeList.size() + exceptList.size();
if (0 == nfd) return 0;
SharedPollArray pPollArr = new pollfd[nfd];
int idx = 0;
for (SocketList::iterator it = readList.begin(); it != readList.end(); ++it)
{
pPollArr[idx].fd = int(it->sockfd());
pPollArr[idx++].events |= POLLIN;
}
SocketList::iterator begR = readList.begin();
SocketList::iterator endR = readList.end();
for (SocketList::iterator it = writeList.begin(); it != writeList.end(); ++it)
{
SocketList::iterator pos = std::find(begR, endR, *it);
if (pos != endR)
{
pPollArr[pos-begR].events |= POLLOUT;
--nfd;
}
else
{
pPollArr[idx].fd = int(it->sockfd());
pPollArr[idx++].events |= POLLOUT;
}
}
SocketList::iterator begW = writeList.begin();
SocketList::iterator endW = writeList.end();
for (SocketList::iterator it = exceptList.begin(); it != exceptList.end(); ++it)
{
SocketList::iterator pos = std::find(begR, endR, *it);
if (pos != endR) --nfd;
else
{
SocketList::iterator pos = std::find(begW, endW, *it);
if (pos != endW) --nfd;
else pPollArr[idx++].fd = int(it->sockfd());
}
}
Poco::Timespan remainingTime(timeout);
int rc;
do
{
Poco::Timestamp start;
rc = ::poll(pPollArr, nfd, timeout.totalMilliseconds());
if (rc < 0 && SocketImpl::lastError() == POCO_EINTR)
{
Poco::Timestamp end;
Poco::Timespan waited = end - start;
if (waited < remainingTime) remainingTime -= waited;
else remainingTime = 0;
}
}
while (rc < 0 && SocketImpl::lastError() == POCO_EINTR);
if (rc < 0) SocketImpl::error();
SocketList readyReadList;
SocketList readyWriteList;
SocketList readyExceptList;
SocketList::iterator begE = exceptList.begin();
SocketList::iterator endE = exceptList.end();
for (int idx = 0; idx < nfd; ++idx)
{
SocketList::iterator slIt = std::find_if(begR, endR, Socket::FDCompare(pPollArr[idx].fd));
if (POLLIN & pPollArr[idx].revents && slIt != endR) readyReadList.push_back(*slIt);
slIt = std::find_if(begW, endW, Socket::FDCompare(pPollArr[idx].fd));
if (POLLOUT & pPollArr[idx].revents && slIt != endW) readyWriteList.push_back(*slIt);
slIt = std::find_if(begE, endE, Socket::FDCompare(pPollArr[idx].fd));
if (POLLERR & pPollArr[idx].revents && slIt != endE) readyExceptList.push_back(*slIt);
}
std::swap(readList, readyReadList);
std::swap(writeList, readyWriteList);
std::swap(exceptList, readyExceptList);
return readList.size() + writeList.size() + exceptList.size();
#endif
}
int Socket::select(SocketList& readList, SocketList& writeList, SocketList& exceptList, const Poco::Timespan& timeout)
{
fd_set fdRead;
fd_set fdWrite;
fd_set fdExcept;
int nfd = 0;
FD_ZERO(&fdRead);
for (SocketList::const_iterator it = readList.begin(); it != readList.end(); ++it)
{
if (int(it->sockfd()) > nfd)
nfd = int(it->sockfd());
FD_SET(it->sockfd(), &fdRead);
}
FD_ZERO(&fdWrite);
for (SocketList::const_iterator it = writeList.begin(); it != writeList.end(); ++it)
{
if (int(it->sockfd()) > nfd)
nfd = int(it->sockfd());
FD_SET(it->sockfd(), &fdWrite);
}
FD_ZERO(&fdExcept);
for (SocketList::const_iterator it = exceptList.begin(); it != exceptList.end(); ++it)
{
if (int(it->sockfd()) > nfd)
nfd = int(it->sockfd());
FD_SET(it->sockfd(), &fdExcept);
}
if (nfd == 0) return 0;
Poco::Timespan remainingTime(timeout);
int rc;
do
{
struct timeval tv;
tv.tv_sec = (long) remainingTime.totalSeconds();
tv.tv_usec = (long) remainingTime.useconds();
Poco::Timestamp start;
rc = ::select(nfd + 1, &fdRead, &fdWrite, &fdExcept, &tv);
if (rc < 0 && SocketImpl::lastError() == POCO_EINTR)
{
Poco::Timestamp end;
Poco::Timespan waited = end - start;
if (waited < remainingTime)
remainingTime -= waited;
else
remainingTime = 0;
}
}
while (rc < 0 && SocketImpl::lastError() == POCO_EINTR);
if (rc < 0) SocketImpl::error();
SocketList readyReadList;
for (SocketList::const_iterator it = readList.begin(); it != readList.end(); ++it)
{
if (FD_ISSET(it->sockfd(), &fdRead))
readyReadList.push_back(*it);
}
std::swap(readList, readyReadList);
SocketList readyWriteList;
for (SocketList::const_iterator it = writeList.begin(); it != writeList.end(); ++it)
{
if (FD_ISSET(it->sockfd(), &fdWrite))
readyWriteList.push_back(*it);
}
std::swap(writeList, readyWriteList);
SocketList readyExceptList;
for (SocketList::const_iterator it = exceptList.begin(); it != exceptList.end(); ++it)
{
if (FD_ISSET(it->sockfd(), &fdExcept))
readyExceptList.push_back(*it);
}
std::swap(exceptList, readyExceptList);
return rc;
}
} } // namespace Poco::Net