src/socketengine_epoll.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2007 InspIRCd Development Team
   6  * See: http://www.inspircd.org/wiki/index.php/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include "inspircd.h"
  15 #include "exitcodes.h"
  16 #include <sys/epoll.h>
  17 #include "socketengine_epoll.h"
  18
  19 EPollEngine::EPollEngine(InspIRCd* Instance) : SocketEngine(Instance)
  20 {
  21         EngineHandle = epoll_create(MAX_DESCRIPTORS);
  22
  23         if (EngineHandle == -1)
  24         {
  25                 ServerInstance->Log(SPARSE,"ERROR: Could not initialize socket engine: %s", strerror(errno));
  26                 ServerInstance->Log(SPARSE,"ERROR: Your kernel probably does not have the proper features. This is a fatal error, exiting now.");
  27                 printf("ERROR: Could not initialize socket engine: %s\n", strerror(errno));
  28                 printf("ERROR: Your kernel probably does not have the proper features. This is a fatal error, exiting now.\n");
  29                 InspIRCd::Exit(EXIT_STATUS_SOCKETENGINE);
  30         }
  31         CurrentSetSize = 0;
  32 }
  33
  34 EPollEngine::~EPollEngine()
  35 {
  36         close(EngineHandle);
  37 }
  38
  39 bool EPollEngine::AddFd(EventHandler* eh)
  40 {
  41         int fd = eh->GetFd();
  42         if ((fd < 0) || (fd > MAX_DESCRIPTORS))
  43                 return false;
  44
  45         if (GetRemainingFds() <= 1)
  46                 return false;
  47
  48         if (ref[fd])
  49                 return false;
  50
  51         ref[fd] = eh;
  52         struct epoll_event ev;
  53         memset(&ev,0,sizeof(struct epoll_event));
  54         eh->Readable() ? ev.events = EPOLLIN : ev.events = EPOLLOUT;
  55         ev.data.fd = fd;
  56         int i = epoll_ctl(EngineHandle, EPOLL_CTL_ADD, fd, &ev);
  57         if (i < 0)
  58         {
  59                 return false;
  60         }
  61
  62         ServerInstance->Log(DEBUG,"New file descriptor: %d", fd);
  63         CurrentSetSize++;
  64         return true;
  65 }
  66
  67 void EPollEngine::WantWrite(EventHandler* eh)
  68 {
  69         /** Use oneshot so that the system removes the writeable
  70          * status for us and saves us a call.
  71          */
  72         struct epoll_event ev;
  73         memset(&ev,0,sizeof(struct epoll_event));
  74         ev.events = EPOLLOUT;
  75         ev.data.fd = eh->GetFd();
  76         epoll_ctl(EngineHandle, EPOLL_CTL_MOD, eh->GetFd(), &ev);
  77 }
  78
  79 bool EPollEngine::DelFd(EventHandler* eh, bool force)
  80 {
  81         int fd = eh->GetFd();
  82         if ((fd < 0) || (fd > MAX_DESCRIPTORS))
  83                 return false;
  84
  85         struct epoll_event ev;
  86         memset(&ev,0,sizeof(struct epoll_event));
  87         eh->Readable() ? ev.events = EPOLLIN : ev.events = EPOLLOUT;
  88         ev.data.fd = fd;
  89         int i = epoll_ctl(EngineHandle, EPOLL_CTL_DEL, fd, &ev);
  90
  91         if (i < 0 && !force)
  92                 return false;
  93
  94         CurrentSetSize--;
  95         ref[fd] = NULL;
  96
  97         ServerInstance->Log(DEBUG,"Remove file descriptor: %d", fd);
  98         return true;
  99 }
 100
 101 int EPollEngine::GetMaxFds()
 102 {
 103         return MAX_DESCRIPTORS;
 104 }
 105
 106 int EPollEngine::GetRemainingFds()
 107 {
 108         return MAX_DESCRIPTORS - CurrentSetSize;
 109 }
 110
 111 int EPollEngine::DispatchEvents()
 112 {
 113         socklen_t codesize;
 114         int errcode;
 115         int i = epoll_wait(EngineHandle, events, MAX_DESCRIPTORS, 1000);
 116         for (int j = 0; j < i; j++)
 117         {
 118                 if (events[j].events & EPOLLHUP)
 119                 {
 120                         if (ref[events[j].data.fd])
 121                                 ref[events[j].data.fd]->HandleEvent(EVENT_ERROR, 0);
 122                         continue;
 123                 }
 124                 if (events[j].events & EPOLLERR)
 125                 {
 126                         /* Get error number */
 127                         if (getsockopt(events[j].data.fd, SOL_SOCKET, SO_ERROR, &errcode, &codesize) < 0)
 128                                 errcode = errno;
 129                         if (ref[events[j].data.fd])
 130                                 ref[events[j].data.fd]->HandleEvent(EVENT_ERROR, errcode);
 131                         continue;
 132                 }
 133                 if (events[j].events & EPOLLOUT)
 134                 {
 135                         struct epoll_event ev;
 136                         memset(&ev,0,sizeof(struct epoll_event));
 137                         ev.events = EPOLLIN;
 138                         ev.data.fd = events[j].data.fd;
 139                         epoll_ctl(EngineHandle, EPOLL_CTL_MOD, events[j].data.fd, &ev);
 140                         if (ref[events[j].data.fd])
 141                                 ref[events[j].data.fd]->HandleEvent(EVENT_WRITE);
 142                 }
 143                 else
 144                 {
 145                         if (ref[events[j].data.fd])
 146                                 ref[events[j].data.fd]->HandleEvent(EVENT_READ);
 147                 }
 148         }
 149
 150         return i;
 151 }
 152
 153 std::string EPollEngine::GetName()
 154 {
 155         return "epoll";
 156 }
 157