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);
}
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;
}
int Socket::select(SocketList& readList, SocketList& writeList, SocketList& exceptList, const Poco::Timespan& timeout)
{
#if defined(POCO_HAVE_FD_EPOLL)
int epollSize = readList.size() + writeList.size() + exceptList.size();
if (epollSize == 0) return 0;
int epollfd = -1;
{
struct epoll_event eventsIn[epollSize];
memset(eventsIn, 0, sizeof(eventsIn));
struct epoll_event* eventLast = eventsIn;
for (SocketList::iterator it = readList.begin(); it != readList.end(); ++it)
{
poco_socket_t sockfd = it->sockfd();
if (sockfd != POCO_INVALID_SOCKET)
{
struct epoll_event* e = eventsIn;
for (; e != eventLast; ++e)
{
if (reinterpret_cast<Socket*>(e->data.ptr)->sockfd() == sockfd)
break;
}
if (e == eventLast)
{
e->data.ptr = &(*it);
++eventLast;
}
e->events |= EPOLLIN;
}
}
for (SocketList::iterator it = writeList.begin(); it != writeList.end(); ++it)
{
poco_socket_t sockfd = it->sockfd();
if (sockfd != POCO_INVALID_SOCKET)
{
struct epoll_event* e = eventsIn;
for (; e != eventLast; ++e)
{
if (reinterpret_cast<Socket*>(e->data.ptr)->sockfd() == sockfd)
break;
}
if (e == eventLast)
{
e->data.ptr = &(*it);
++eventLast;
}
e->events |= EPOLLOUT;
}
}
for (SocketList::iterator it = exceptList.begin(); it != exceptList.end(); ++it)
{
poco_socket_t sockfd = it->sockfd();
if (sockfd != POCO_INVALID_SOCKET)
{
struct epoll_event* e = eventsIn;
for (; e != eventLast; ++e)
{
if (reinterpret_cast<Socket*>(e->data.ptr)->sockfd() == sockfd)
break;
}
if (e == eventLast)
{
e->data.ptr = &(*it);
++eventLast;
}
e->events |= EPOLLERR;
}
}
epollSize = eventLast - eventsIn;
epollfd = epoll_create(epollSize);
if (epollfd < 0)
{
char buf[1024];
strerror_r(errno, buf, sizeof(buf));
SocketImpl::error(std::string("Can't create epoll queue: ") + buf);
}
for (struct epoll_event* e = eventsIn; e != eventLast; ++e)
{
poco_socket_t sockfd = reinterpret_cast<Socket*>(e->data.ptr)->sockfd();
if (sockfd != POCO_INVALID_SOCKET)
{
if (epoll_ctl(epollfd, EPOLL_CTL_ADD, sockfd, e) < 0)
{
char buf[1024];
strerror_r(errno, buf, sizeof(buf));
::close(epollfd);
SocketImpl::error(std::string("Can't insert socket to epoll queue: ") + buf);
}
}
}
}
struct epoll_event eventsOut[epollSize];
memset(eventsOut, 0, sizeof(eventsOut));
Poco::Timespan remainingTime(timeout);
int rc;
do
{
Poco::Timestamp start;
rc = epoll_wait(epollfd, eventsOut, epollSize, remainingTime.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);
::close(epollfd);
if (rc < 0) SocketImpl::error();
SocketList readyReadList;
SocketList readyWriteList;
SocketList readyExceptList;
for (int n = 0; n < rc; ++n)
{
if (eventsOut[n].events & EPOLLERR)
readyExceptList.push_back(*reinterpret_cast<Socket*>(eventsOut[n].data.ptr));
if (eventsOut[n].events & EPOLLIN)
readyReadList.push_back(*reinterpret_cast<Socket*>(eventsOut[n].data.ptr));
if (eventsOut[n].events & EPOLLOUT)
readyWriteList.push_back(*reinterpret_cast<Socket*>(eventsOut[n].data.ptr));
}
std::swap(readList, readyReadList);
std::swap(writeList, readyWriteList);
std::swap(exceptList, readyExceptList);
return readList.size() + writeList.size() + exceptList.size();
#elif defined(POCO_HAVE_FD_POLL)
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();
#else
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)
{
poco_socket_t fd = it->sockfd();
if (fd != POCO_INVALID_SOCKET)
{
if (int(fd) > nfd)
nfd = int(fd);
FD_SET(fd, &fdRead);
}
}
FD_ZERO(&fdWrite);
for (SocketList::const_iterator it = writeList.begin(); it != writeList.end(); ++it)
{
poco_socket_t fd = it->sockfd();
if (fd != POCO_INVALID_SOCKET)
{
if (int(fd) > nfd)
nfd = int(fd);
FD_SET(fd, &fdWrite);
}
}
FD_ZERO(&fdExcept);
for (SocketList::const_iterator it = exceptList.begin(); it != exceptList.end(); ++it)
{
poco_socket_t fd = it->sockfd();
if (fd != POCO_INVALID_SOCKET)
{
if (int(fd) > nfd)
nfd = int(fd);
FD_SET(fd, &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)
{
poco_socket_t fd = it->sockfd();
if (fd != POCO_INVALID_SOCKET)
{
if (FD_ISSET(fd, &fdRead))
readyReadList.push_back(*it);
}
}
std::swap(readList, readyReadList);
SocketList readyWriteList;
for (SocketList::const_iterator it = writeList.begin(); it != writeList.end(); ++it)
{
poco_socket_t fd = it->sockfd();
if (fd != POCO_INVALID_SOCKET)
{
if (FD_ISSET(fd, &fdWrite))
readyWriteList.push_back(*it);
}
}
std::swap(writeList, readyWriteList);
SocketList readyExceptList;
for (SocketList::const_iterator it = exceptList.begin(); it != exceptList.end(); ++it)
{
poco_socket_t fd = it->sockfd();
if (fd != POCO_INVALID_SOCKET)
{
if (FD_ISSET(fd, &fdExcept))
readyExceptList.push_back(*it);
}
}
std::swap(exceptList, readyExceptList);
return rc;
#endif // POCO_HAVE_FD_EPOLL
}