Add epoll support

gsock.cpp

@@ -38,6 +38,7 @@
 #include <sys/socket.h>
 #include <unistd.h>
 #include <fcntl.h>
+#include <sys/epoll.h>
 #define closesocket close
 using BYTE = unsigned char;
 #define WSAGetLastError() errno
@@ -1066,6 +1067,35 @@ bool selector::is_error(const vsock& v)
 	return FD_ISSET(v._vp->sfd, &_pp->errorset);
 }
 
+#ifdef WIN32 // Windows: IOCP. Coming soon...
+
+#else // Linux: epoll
+epoll::epoll()
+{
+	_fd=epoll_create(1024); // this parameter is useless.
+}
+epoll::~epoll()
+{
+	close(_fd);
+}
+int epoll::add(const vsock& v,epoll_event* event)
+{
+	return epoll_ctl(_fd,EPOLL_CTL_ADD,v._vp->sfd,event);
+}
+int epoll::mod(const vsock& v,epoll_event* event)
+{
+	return epoll_ctl(_fd,EPOLL_CTL_MOD,v._vp->sfd,event);
+}
+int epoll::del(const vsock& v,epoll_event* event)
+{
+	return epoll_ctl(_fd,EPOLL_CTL_DEL,v._vp->sfd,event);
+}
+int epoll::wait(epoll_event* events,int maxsize,int timeout)
+{
+	return epoll_wait(_fd,events,maxsize,timeout);
+}
+#endif
+
 int DNSResolve(const std::string& HostName, std::vector<std::string>& _out_IPStrVec)
 {
 	std::vector<std::string> vec;

gsock.h

@@ -39,6 +39,11 @@ protected:
 	_impl* _vp;
 
 	friend class selector;
+#ifdef WIN32
+
+#else
+    friend class epoll;
+#endif
 };
 
 class sock : public vsock
@@ -220,6 +225,29 @@ private:
 	_impl* _pp;
 };
 
+#ifdef WIN32 // Windows: IOCP. Coming soon...
+
+#else // Linux: epoll
+class epoll
+{
+public:
+    epoll();
+    int add(const vsock& v,epoll_event* event);
+    int mod(const vsock& v,epoll_event* event);
+    int del(const vsock& v,epoll_event* event);
+
+    // >0: event counts.
+    // =0: Time up.
+    // <0: Error.
+    // Set timeout to -1 for infinity waiting.
+    int wait(epoll_event* events,int maxsize,int timeout);
+
+    ~epoll();
+private:
+    int _fd;
+};
+#endif // End of Platform specific
+
 /// Net Tools
 
 // Return: