1/* 2 * libjingle 3 * Copyright 2004--2005, Google Inc. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright notice, 9 * this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright notice, 11 * this list of conditions and the following disclaimer in the documentation 12 * and/or other materials provided with the distribution. 13 * 3. The name of the author may not be used to endorse or promote products 14 * derived from this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO 19 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28#ifndef TALK_BASE_PHYSICALSOCKETSERVER_H__ 29#define TALK_BASE_PHYSICALSOCKETSERVER_H__ 30 31#include <vector> 32 33#include "talk/base/asyncfile.h" 34#include "talk/base/scoped_ptr.h" 35#include "talk/base/socketserver.h" 36#include "talk/base/criticalsection.h" 37 38#ifdef POSIX 39typedef int SOCKET; 40#endif // POSIX 41 42namespace talk_base { 43 44// Event constants for the Dispatcher class. 45enum DispatcherEvent { 46 DE_READ = 0x0001, 47 DE_WRITE = 0x0002, 48 DE_CONNECT = 0x0004, 49 DE_CLOSE = 0x0008, 50 DE_ACCEPT = 0x0010, 51}; 52 53class Signaler; 54#ifdef POSIX 55class PosixSignalDispatcher; 56#endif 57 58class Dispatcher { 59 public: 60 virtual ~Dispatcher() {} 61 virtual uint32 GetRequestedEvents() = 0; 62 virtual void OnPreEvent(uint32 ff) = 0; 63 virtual void OnEvent(uint32 ff, int err) = 0; 64#ifdef WIN32 65 virtual WSAEVENT GetWSAEvent() = 0; 66 virtual SOCKET GetSocket() = 0; 67 virtual bool CheckSignalClose() = 0; 68#elif POSIX 69 virtual int GetDescriptor() = 0; 70 virtual bool IsDescriptorClosed() = 0; 71#endif 72}; 73 74// A socket server that provides the real sockets of the underlying OS. 75class PhysicalSocketServer : public SocketServer { 76 public: 77 PhysicalSocketServer(); 78 virtual ~PhysicalSocketServer(); 79 80 // SocketFactory: 81 virtual Socket* CreateSocket(int type); 82 virtual Socket* CreateSocket(int family, int type); 83 84 virtual AsyncSocket* CreateAsyncSocket(int type); 85 virtual AsyncSocket* CreateAsyncSocket(int family, int type); 86 87 // Internal Factory for Accept 88 AsyncSocket* WrapSocket(SOCKET s); 89 90 // SocketServer: 91 virtual bool Wait(int cms, bool process_io); 92 virtual void WakeUp(); 93 94 void Add(Dispatcher* dispatcher); 95 void Remove(Dispatcher* dispatcher); 96 97#ifdef POSIX 98 AsyncFile* CreateFile(int fd); 99 100 // Sets the function to be executed in response to the specified POSIX signal. 101 // The function is executed from inside Wait() using the "self-pipe trick"-- 102 // regardless of which thread receives the signal--and hence can safely 103 // manipulate user-level data structures. 104 // "handler" may be SIG_IGN, SIG_DFL, or a user-specified function, just like 105 // with signal(2). 106 // Only one PhysicalSocketServer should have user-level signal handlers. 107 // Dispatching signals on multiple PhysicalSocketServers is not reliable. 108 // The signal mask is not modified. It is the caller's responsibily to 109 // maintain it as desired. 110 virtual bool SetPosixSignalHandler(int signum, void (*handler)(int)); 111 112 protected: 113 Dispatcher* signal_dispatcher(); 114#endif 115 116 private: 117 typedef std::vector<Dispatcher*> DispatcherList; 118 typedef std::vector<size_t*> IteratorList; 119 120#ifdef POSIX 121 static bool InstallSignal(int signum, void (*handler)(int)); 122 123 scoped_ptr<PosixSignalDispatcher> signal_dispatcher_; 124#endif 125 DispatcherList dispatchers_; 126 IteratorList iterators_; 127 Signaler* signal_wakeup_; 128 CriticalSection crit_; 129 bool fWait_; 130 uint32 last_tick_tracked_; 131 int last_tick_dispatch_count_; 132#ifdef WIN32 133 WSAEVENT socket_ev_; 134#endif 135}; 136 137} // namespace talk_base 138 139#endif // TALK_BASE_PHYSICALSOCKETSERVER_H__ 140