src/socketengines/socketengine_epoll.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2008 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 "socketengines/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->Logs->Log("SOCKET",DEFAULT, "ERROR: Could not initialize socket engine: %s", strerror(errno));
  26                 ServerInstance->Logs->Log("SOCKET",DEFAULT, "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                 ServerInstance->Exit(EXIT_STATUS_SOCKETENGINE);
  30         }
  31         CurrentSetSize = 0;
  32 }
  33
  34 EPollEngine::~EPollEngine()
  35 {
  36         this->Close(EngineHandle);
  37 }
  38
  39 bool EPollEngine::AddFd(EventHandler* eh)
  40 {
  41         int fd = eh->GetFd();
  42         if ((fd < 0) || (fd > MAX_DESCRIPTORS))
  43         {
  44                 ServerInstance->Logs->Log("SOCKET",DEBUG,"Out of range FD");
  45                 return false;
  46         }
  47
  48         if (GetRemainingFds() <= 1)
  49                 return false;
  50
  51         if (ref[fd])
  52                 return false;
  53
  54         struct epoll_event ev;
  55         memset(&ev,0,sizeof(struct epoll_event));
  56         eh->Readable() ? ev.events = EPOLLIN : ev.events = EPOLLOUT;
  57         ev.data.fd = fd;
  58         int i = epoll_ctl(EngineHandle, EPOLL_CTL_ADD, fd, &ev);
  59         if (i < 0)
  60         {
  61                 return false;
  62         }
  63
  64         ServerInstance->Logs->Log("SOCKET",DEBUG,"New file descriptor: %d", fd);
  65
  66         ref[fd] = eh;
  67         CurrentSetSize++;
  68         return true;
  69 }
  70
  71 void EPollEngine::WantWrite(EventHandler* eh)
  72 {
  73         /** Use oneshot so that the system removes the writeable
  74          * status for us and saves us a call.
  75          */
  76         struct epoll_event ev;
  77         memset(&ev,0,sizeof(struct epoll_event));
  78         ev.events = EPOLLOUT;
  79         ev.data.fd = eh->GetFd();
  80         epoll_ctl(EngineHandle, EPOLL_CTL_MOD, eh->GetFd(), &ev);
  81 }
  82
  83 bool EPollEngine::DelFd(EventHandler* eh, bool force)
  84 {
  85         int fd = eh->GetFd();
  86         if ((fd < 0) || (fd > MAX_DESCRIPTORS))
  87                 return false;
  88
  89         struct epoll_event ev;
  90         memset(&ev,0,sizeof(struct epoll_event));
  91         eh->Readable() ? ev.events = EPOLLIN : ev.events = EPOLLOUT;
  92         ev.data.fd = fd;
  93         int i = epoll_ctl(EngineHandle, EPOLL_CTL_DEL, fd, &ev);
  94
  95         if (i < 0 && !force)
  96         {
  97                 ServerInstance->Logs->Log("SOCKET",DEBUG,"Cant remove socket: %s", strerror(errno));
  98                 return false;
  99         }
 100
 101         ref[fd] = NULL;
 102         CurrentSetSize--;
 103
 104         ServerInstance->Logs->Log("SOCKET",DEBUG,"Remove file descriptor: %d", fd);
 105         return true;
 106 }
 107
 108 int EPollEngine::GetMaxFds()
 109 {
 110         return MAX_DESCRIPTORS;
 111 }
 112
 113 int EPollEngine::GetRemainingFds()
 114 {
 115         return MAX_DESCRIPTORS - CurrentSetSize;
 116 }
 117
 118 int EPollEngine::DispatchEvents()
 119 {
 120         socklen_t codesize;
 121         int errcode;
 122         int i = epoll_wait(EngineHandle, events, MAX_DESCRIPTORS, 1000);
 123
 124         TotalEvents += i;
 125
 126         for (int j = 0; j < i; j++)
 127         {
 128                 if (events[j].events & EPOLLHUP)
 129                 {
 130                         ErrorEvents++;
 131                         if (ref[events[j].data.fd])
 132                                 ref[events[j].data.fd]->HandleEvent(EVENT_ERROR, 0);
 133                         continue;
 134                 }
 135                 if (events[j].events & EPOLLERR)
 136                 {
 137                         ErrorEvents++;
 138                         /* Get error number */
 139                         if (getsockopt(events[j].data.fd, SOL_SOCKET, SO_ERROR, &errcode, &codesize) < 0)
 140                                 errcode = errno;
 141                         if (ref[events[j].data.fd])
 142                                 ref[events[j].data.fd]->HandleEvent(EVENT_ERROR, errcode);
 143                         continue;
 144                 }
 145                 if (events[j].events & EPOLLOUT)
 146                 {
 147                         WriteEvents++;
 148                         struct epoll_event ev;
 149                         memset(&ev,0,sizeof(struct epoll_event));
 150                         ev.events = EPOLLIN;
 151                         ev.data.fd = events[j].data.fd;
 152                         epoll_ctl(EngineHandle, EPOLL_CTL_MOD, events[j].data.fd, &ev);
 153                         if (ref[events[j].data.fd])
 154                                 ref[events[j].data.fd]->HandleEvent(EVENT_WRITE);
 155                 }
 156                 else
 157                 {
 158                         ReadEvents++;
 159                         if (ref[events[j].data.fd])
 160                                 ref[events[j].data.fd]->HandleEvent(EVENT_READ);
 161                 }
 162         }
 163
 164         return i;
 165 }
 166
 167 std::string EPollEngine::GetName()
 168 {
 169         return "epoll";
 170 }
 171