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/*
* This file is part of PowerDNS or dnsdist.
* Copyright -- PowerDNS.COM B.V. and its contributors
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* In addition, for the avoidance of any doubt, permission is granted to
* link this program with OpenSSL and to (re)distribute the binaries
* produced as the result of such linking.
*
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
/*
* NOTE: sys/devpoll.h relies on sigset_t being already defined so we need
* to include sys/signal.h *before* including sys/devpoll.h.
*/
#include <sys/signal.h>
#include <sys/devpoll.h>
#include "mplexer.hh"
#include "sstuff.hh"
#include <iostream>
#include <unistd.h>
#include "misc.hh"
#include "namespaces.hh"
class DevPollFDMultiplexer : public FDMultiplexer
{
public:
DevPollFDMultiplexer();
~DevPollFDMultiplexer()
{
if (d_devpollfd >= 0) {
close(d_devpollfd);
}
}
int run(struct timeval* tv, int timeout = 500) override;
void getAvailableFDs(std::vector<int>& fds, int timeout) override;
void addFD(int fd, FDMultiplexer::EventKind kind) override;
void removeFD(int fd, FDMultiplexer::EventKind kind) override;
string getName() const override
{
return "/dev/poll";
}
private:
int d_devpollfd;
};
static FDMultiplexer* makeDevPoll(unsigned int)
{
return new DevPollFDMultiplexer();
}
static struct DevPollRegisterOurselves
{
DevPollRegisterOurselves()
{
FDMultiplexer::getMultiplexerMap().emplace(1, &makeDevPoll); // priority 1, so that /dev/poll is preferred over poll, but not over completion ports!
}
} doItDevPoll;
DevPollFDMultiplexer::DevPollFDMultiplexer()
{
d_devpollfd = open("/dev/poll", O_RDWR);
if (d_devpollfd < 0) {
throw FDMultiplexerException("Setting up /dev/poll: " + stringerror());
}
}
static int convertEventKind(FDMultiplexer::EventKind kind)
{
switch (kind) {
case FDMultiplexer::EventKind::Read:
return POLLIN;
case FDMultiplexer::EventKind::Write:
return POLLOUT;
case FDMultiplexer::EventKind::Both:
return POLLIN | POLLOUT;
}
throw std::runtime_error("Unhandled event kind in the /dev/poll multiplexer");
}
void DevPollFDMultiplexer::addFD(int fd, FDMultiplexer::EventKind kind)
{
struct pollfd devent;
devent.fd = fd;
devent.events = convertEventKind(kind);
devent.revents = 0;
if (write(d_devpollfd, &devent, sizeof(devent)) != sizeof(devent)) {
throw FDMultiplexerException("Adding fd to /dev/poll/ set: " + stringerror());
}
}
void DevPollFDMultiplexer::removeFD(int fd, FDMultiplexer::EventKind)
{
struct pollfd devent;
devent.fd = fd;
devent.events = POLLREMOVE;
devent.revents = 0;
if (write(d_devpollfd, &devent, sizeof(devent)) != sizeof(devent)) {
throw FDMultiplexerException("Removing fd from epoll set: " + stringerror());
}
}
void DevPollFDMultiplexer::getAvailableFDs(std::vector<int>& fds, int timeout)
{
std::vector<struct pollfd> pollfds(d_readCallbacks.size() + d_writeCallbacks.size());
struct dvpoll dvp;
dvp.dp_nfds = d_readCallbacks.size() + d_writeCallbacks.size();
dvp.dp_fds = pollfds.data();
dvp.dp_timeout = timeout;
int ret = ioctl(d_devpollfd, DP_POLL, &dvp);
if (ret < 0 && errno != EINTR) {
throw FDMultiplexerException("/dev/poll returned error: " + stringerror());
}
for (int n = 0; n < ret; ++n) {
fds.push_back(pollfds.at(n).fd);
}
}
int DevPollFDMultiplexer::run(struct timeval* now, int timeout)
{
if (d_inrun) {
throw FDMultiplexerException("FDMultiplexer::run() is not reentrant!\n");
}
std::vector<struct pollfd> fds(d_readCallbacks.size() + d_writeCallbacks.size());
struct dvpoll dvp;
dvp.dp_nfds = d_readCallbacks.size() + d_writeCallbacks.size();
dvp.dp_fds = fds.data();
dvp.dp_timeout = timeout;
int ret = ioctl(d_devpollfd, DP_POLL, &dvp);
int err = errno;
gettimeofday(now, nullptr); // MANDATORY!
if (ret < 0 && err != EINTR) {
throw FDMultiplexerException("/dev/poll returned error: " + stringerror(err));
}
if (ret < 1) { // thanks AB!
return 0;
}
d_inrun = true;
int count = 0;
for (int n = 0; n < ret; ++n) {
if ((fds.at(n).revents & POLLIN) || (fds.at(n).revents & POLLERR) || (fds.at(n).revents & POLLHUP)) {
const auto& iter = d_readCallbacks.find(fds.at(n).fd);
if (iter != d_readCallbacks.end()) {
iter->d_callback(iter->d_fd, iter->d_parameter);
count++;
}
}
if ((fds.at(n).revents & POLLOUT) || (fds.at(n).revents & POLLERR)) {
const auto& iter = d_writeCallbacks.find(fds.at(n).fd);
if (iter != d_writeCallbacks.end()) {
iter->d_callback(iter->d_fd, iter->d_parameter);
count++;
}
}
}
d_inrun = false;
return count;
}
#if 0
void acceptData(int fd, funcparam_t& parameter)
{
cout<<"Have data on fd "<<fd<<endl;
Socket* sock=funcparam_t_cast<Socket*>(parameter);
string packet;
IPEndpoint rem;
sock->recvFrom(packet, rem);
cout<<"Received "<<packet.size()<<" bytes!\n";
}
int main()
{
Socket s(AF_INET, SOCK_DGRAM);
IPEndpoint loc("0.0.0.0", 2000);
s.bind(loc);
DevPollFDMultiplexer sfm;
sfm.addReadFD(s.getHandle(), &acceptData, &s);
for(int n=0; n < 100 ; ++n) {
sfm.run();
}
sfm.removeReadFD(s.getHandle());
sfm.removeReadFD(s.getHandle());
}
#endif
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