Forward-port poll socket engine as it seems reasonably stable, and half-hack it into configure. If someone could help me (easily) add it via our wonderful configure macros so it's built, that would be swell.

git-svn-id: http://svn.inspircd.org/repository/trunk/inspircd@10264 e03df62e-2008-0410-955e-edbf42e46eb7

1 files changed, 180 insertions, 0 deletions

diff --git a/src/socketengines/socketengine_poll.cpp b/src/socketengines/socketengine_poll.cpp
new file mode 100644
index 000000000..ddeb057d6
--- /dev/null
+++ b/src/socketengines/socketengine_poll.cpp
@@ -0,0 +1,180 @@
+/*       +------------------------------------+
+ *       | Inspire Internet Relay Chat Daemon |
+ *       +------------------------------------+
+ *
+ *  InspIRCd: (C) 2002-2008 InspIRCd Development Team
+ * See: http://www.inspircd.org/wiki/index.php/Credits
+ *
+ * This program is free but copyrighted software; see
+ *            the file COPYING for details.
+ *
+ * ---------------------------------------------------
+ */
+
+#include "inspircd.h"
+#include "exitcodes.h"
+#include "socketengines/socketengine_poll.h"
+
+PollEngine::PollEngine(InspIRCd* Instance) : SocketEngine(Instance)
+{
+	// Poll requires no special setup (which is nice).
+	CurrentSetSize = 0;
+
+	ref = new EventHandler* [GetMaxFds()];
+	events = new struct epoll_event[GetMaxFds()];
+
+	memset(&events, 0, GetMaxFds() * sizeof(struct pollfds*));
+}
+
+PollEngine::~PollEngine()
+{
+	// No destruction required, either.
+	delete[] ref;
+	delete[] events;
+}
+
+bool PollEngine::AddFd(EventHandler* eh)
+{
+	int fd = eh->GetFd();
+	if ((fd < 0) || (fd > GetMaxFds() - 1))
+	{
+		ServerInstance->Logs->Log("SOCKET",DEBUG,"AddFd out of range: (fd: %d, max: %d)", fd, GetMaxFds());
+		return false;
+	}
+
+	if (GetRemainingFds() <= 1)
+	{
+		ServerInstance->Logs->Log("SOCKET",DEBUG,"No remaining FDs cannot add fd: %d", fd);
+		return false;
+	}
+
+	if (ref[fd])
+	{
+		ServerInstance->Logs->Log("SOCKET",DEBUG,"Attempt to add duplicate fd: %d", fd);
+		return false;
+	}
+
+	ref[fd] = eh;
+	events[fd]->fd = fd;
+	if (eh->Readable())
+	{
+		events[fd]->events = POLLIN;
+	}
+	else
+	{
+		events[fd]->events = POLLOUT;
+	}
+
+	ServerInstance->Log(DEBUG,"New file descriptor: %d (%d)", fd, events[fd]->events);
+	CurrentSetSize++;
+	return true;
+}
+
+void PollEngine::WantWrite(EventHandler* eh)
+{
+	events[eh->GetFd()]->events = POLLIN | POLLOUT;
+}
+
+bool PollEngine::DelFd(EventHandler* eh, bool force)
+{
+	int fd = eh->GetFd();
+	if ((fd < 0) || (fd > MAX_DESCRIPTORS))
+	{
+		ServerInstance->Logs->Log("SOCKET",DEBUG,"DelFd out of range: (fd: %d, max: %d)", fd, GetMaxFds());
+		return false;
+	}
+
+	events[fd]->fd = -1;
+	events[fd]->events = 0;
+
+	CurrentSetSize--;
+	ref[fd] = NULL;
+
+	ServerInstance->Log(DEBUG,"Remove file descriptor: %d", fd);
+	return true;
+}
+
+int PollEngine::GetMaxFds()
+{
+	if (MAX_DESCRIPTORS)
+		return MAX_DESCRIPTORS;
+
+	int max = ulimit(4, 0);
+	if (max > 0)
+	{
+		MAX_DESCRIPTORS = max;
+		return max;
+	}
+	else
+	{
+		ServerInstance->Logs->Log("SOCKET", DEFAULT, "ERROR: Can't determine maximum number of open sockets!");
+		printf("ERROR: Can't determine maximum number of open sockets!\n");
+		ServerInstance->Exit(EXIT_STATUS_SOCKETENGINE);
+	}
+	return 0;
+}
+
+int PollEngine::GetRemainingFds()
+{
+	return MAX_DESCRIPTORS - CurrentSetSize;
+}
+
+int PollEngine::DispatchEvents()
+{
+	int i = poll(events, GetMaxFds() - 1, 1000);
+	int fd = 0;
+	socklen_t codesize = sizeof(int);
+	int errcode;
+	int processed = 0;
+
+	if (i > 0)
+	{
+		for (fd = 0; fd < GetMaxFds() - 1 && processed != i; fd++)
+		{
+			if (events[fd].revents)
+				processed++;
+
+			if (events[fd].revents & POLLHUP)
+			{
+				if (ref[fd])
+					ref[fd]->HandleEvent(EVENT_ERROR, 0);
+				continue;
+			}
+
+			if (events[fd].revents & POLLERR)
+			{
+				// Get error number
+				if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &errcode, &codesize) < 0)
+					errcode = errno;
+				if (ref[fd])
+					ref[fd]->HandleEvent(EVENT_ERROR, errcode);
+				continue;
+			}
+
+			if (events[fd].revents & POLLOUT)
+			{
+				// Switch to wanting read again
+				// event handlers have to request to write again if they need it
+				events[fd].events = POLLIN;
+
+
+				if (ref[fd])
+					ref[fd]->HandleEvent(EVENT_WRITE);
+			}
+
+			if (events[fd].revents & POLLIN)
+			{
+				if (ref[fd])
+					ref[fd]->HandleEvent(EVENT_READ);
+			}
+		}
+	}
+
+	return i;
+}
+
+std::string PollEngine::GetName()
+{
+	return "poll";
+}
+