1 files changed, 165 insertions, 0 deletions
diff --git a/src/socketengines/socketengine_select.cpp b/src/socketengines/socketengine_select.cpp
new file mode 100644
index 000000000..1fe138f14
--- /dev/null
+++ b/src/socketengines/socketengine_select.cpp
@@ -0,0 +1,165 @@
+/*       +------------------------------------+
+ *       | Inspire Internet Relay Chat Daemon |
+ *       +------------------------------------+
+ *
+ *  InspIRCd: (C) 2002-2007 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 <sys/select.h>
+#include "socketengines/socketengine_select.h"
+
+
+SelectEngine::SelectEngine(InspIRCd* Instance) : SocketEngine(Instance)
+{
+	EngineHandle = 0;
+	CurrentSetSize = 0;
+	memset(writeable, 0, sizeof(writeable));
+}
+
+SelectEngine::~SelectEngine()
+{
+}
+
+bool SelectEngine::AddFd(EventHandler* eh)
+{
+	int fd = eh->GetFd();
+	if ((fd < 0) || (fd > MAX_DESCRIPTORS))
+		return false;
+
+	if (GetRemainingFds() <= 1)
+		return false;
+
+	if (ref[fd])
+		return false;
+
+	fds[fd] = fd;
+	ref[fd] = eh;
+	CurrentSetSize++;
+
+	ServerInstance->Log(DEBUG,"New file descriptor: %d", fd);
+	return true;
+}
+
+void SelectEngine::WantWrite(EventHandler* eh)
+{
+	writeable[eh->GetFd()] = true;
+}
+
+bool SelectEngine::DelFd(EventHandler* eh, bool force)
+{
+	int fd = eh->GetFd();
+
+	if ((fd < 0) || (fd > MAX_DESCRIPTORS))
+		return false;
+
+	std::map<int,int>::iterator t = fds.find(fd);
+	if (t != fds.end())
+		fds.erase(t);
+
+	CurrentSetSize--;
+	ref[fd] = NULL;
+	fds[fd] = 0;
+
+	ServerInstance->Log(DEBUG,"Remove file descriptor: %d", fd);
+	return true;
+}
+
+int SelectEngine::GetMaxFds()
+{
+	return FD_SETSIZE;
+}
+
+int SelectEngine::GetRemainingFds()
+{
+	return FD_SETSIZE - CurrentSetSize;
+}
+
+int SelectEngine::DispatchEvents()
+{
+	int result = 0;
+	timeval tval;
+	int sresult = 0;
+	EventHandler* ev[MAX_DESCRIPTORS];
+	socklen_t codesize;
+	int errcode;
+
+	FD_ZERO(&wfdset);
+	FD_ZERO(&rfdset);
+	FD_ZERO(&errfdset);
+
+	for (std::map<int,int>::iterator a = fds.begin(); a != fds.end(); a++)
+	{
+		if (ref[a->second]->Readable())
+			FD_SET (a->second, &rfdset);
+		else
+			FD_SET (a->second, &wfdset);
+		if (writeable[a->second])
+			FD_SET (a->second, &wfdset);
+
+		FD_SET (a->second, &errfdset);
+	}
+	tval.tv_sec = 1;
+	tval.tv_usec = 0;
+	sresult = select(FD_SETSIZE, &rfdset, &wfdset, &errfdset, &tval);
+	if (sresult > 0)
+	{
+		for (std::map<int,int>::iterator a = fds.begin(); a != fds.end(); a++)
+		{
+			if ((FD_ISSET (a->second, &rfdset)) || (FD_ISSET (a->second, &wfdset)) || FD_ISSET (a->second, &errfdset))
+			{
+				ev[result++] = ref[a->second];
+			}
+		}
+	}
+
+	/** An event handler may remove its own descriptor from the list, therefore it is not
+	 * safe to directly iterate over the list and dispatch events there with STL iterators.
+	 * Thats a shame because it makes this code slower and more resource intensive, but maybe
+	 * the user should stop using select(), as select() smells anyway.
+	 */
+	for (int i = 0; i < result; i++)
+	{
+		if (ev[i])
+		{
+			if (FD_ISSET (ev[i]->GetFd(), &errfdset))
+			{
+				if (ev[i])
+				{
+					if (getsockopt(ev[i]->GetFd(), SOL_SOCKET, SO_ERROR, &errcode, &codesize) < 0)
+						errcode = errno;
+
+					ev[i]->HandleEvent(EVENT_ERROR, errcode);
+				}
+				continue;
+			}
+			if (ev[i])
+			{
+				if (writeable[ev[i]->GetFd()])
+				{
+					writeable[ev[i]->GetFd()] = false;
+					if (ev[i])
+						ev[i]->HandleEvent(EVENT_WRITE);
+				}
+				else
+				{
+					if (ev[i])
+						ev[i]->HandleEvent(ev[i]->Readable() ? EVENT_READ : EVENT_WRITE);
+				}
+			}
+		}
+	}
+
+	return result;
+}
+
+std::string SelectEngine::GetName()
+{
+	return "select";
+}