src/socketengines/socketengine_ports.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2009 InspIRCd Development Team
   6  * See: http://wiki.inspircd.org/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 <port.h>
  17 #include "socketengines/socketengine_ports.h"
  18 #include <ulimit.h>
  19
  20 PortsEngine::PortsEngine()
  21 {
  22         int max = ulimit(4, 0);
  23         if (max > 0)
  24         {
  25                 MAX_DESCRIPTORS = max;
  26                 return max;
  27         }
  28         else
  29         {
  30                 ServerInstance->Logs->Log("SOCKET", DEFAULT, "ERROR: Can't determine maximum number of open sockets!");
  31                 printf("ERROR: Can't determine maximum number of open sockets!\n");
  32                 ServerInstance->Exit(EXIT_STATUS_SOCKETENGINE);
  33         }
  34         EngineHandle = port_create();
  35
  36         if (EngineHandle == -1)
  37         {
  38                 ServerInstance->Logs->Log("SOCKET",SPARSE,"ERROR: Could not initialize socket engine: %s", strerror(errno));
  39                 ServerInstance->Logs->Log("SOCKET",SPARSE,"ERROR: This is a fatal error, exiting now.");
  40                 printf("ERROR: Could not initialize socket engine: %s\n", strerror(errno));
  41                 printf("ERROR: This is a fatal error, exiting now.\n");
  42                 ServerInstance->Exit(EXIT_STATUS_SOCKETENGINE);
  43         }
  44         CurrentSetSize = 0;
  45
  46         ref = new EventHandler* [GetMaxFds()];
  47         events = new port_event_t[GetMaxFds()];
  48         memset(ref, 0, GetMaxFds() * sizeof(EventHandler*));
  49 }
  50
  51 PortsEngine::~PortsEngine()
  52 {
  53         this->Close(EngineHandle);
  54         delete[] ref;
  55         delete[] events;
  56 }
  57
  58 static int mask_to_events(int event_mask)
  59 {
  60         int rv = 0;
  61         if (event_mask & (FD_WANT_POLL_READ | FD_WANT_FAST_READ))
  62                 rv |= POLLRDNORM;
  63         if (event_mask & (FD_WANT_POLL_WRITE | FD_WANT_FAST_WRITE | FD_WANT_SINGLE_WRITE))
  64                 rv |= POLLWRNORM;
  65         return rv;
  66 }
  67
  68 bool PortsEngine::AddFd(EventHandler* eh, int event_mask)
  69 {
  70         int fd = eh->GetFd();
  71         if ((fd < 0) || (fd > GetMaxFds() - 1))
  72                 return false;
  73
  74         if (ref[fd])
  75                 return false;
  76
  77         ref[fd] = eh;
  78         SocketEngine::SetEventMask(eh, event_mask);
  79         port_associate(EngineHandle, PORT_SOURCE_FD, fd, mask_to_events(event_mask), eh);
  80
  81         ServerInstance->Logs->Log("SOCKET",DEBUG,"New file descriptor: %d", fd);
  82         CurrentSetSize++;
  83         return true;
  84 }
  85
  86 void PortsEngine::WantWrite(EventHandler* eh, int old_mask, int new_mask)
  87 {
  88         if (mask_to_events(new_mask) != mask_to_events(old_mask))
  89                 port_associate(EngineHandle, PORT_SOURCE_FD, eh->GetFd(), mask_to_events(new_mask), eh);
  90 }
  91
  92 bool PortsEngine::DelFd(EventHandler* eh, bool force)
  93 {
  94         int fd = eh->GetFd();
  95         if ((fd < 0) || (fd > GetMaxFds() - 1))
  96                 return false;
  97
  98         port_dissociate(EngineHandle, PORT_SOURCE_FD, fd);
  99
 100         CurrentSetSize--;
 101         ref[fd] = NULL;
 102
 103         ServerInstance->Logs->Log("SOCKET",DEBUG,"Remove file descriptor: %d", fd);
 104         return true;
 105 }
 106
 107 int PortsEngine::DispatchEvents()
 108 {
 109         struct timespec poll_time;
 110
 111         poll_time.tv_sec = 1;
 112         poll_time.tv_nsec = 0;
 113
 114         unsigned int nget = 1; // used to denote a retrieve request.
 115         int i = port_getn(EngineHandle, this->events, GetMaxFds() - 1, &nget, &poll_time);
 116
 117         // first handle an error condition
 118         if (i == -1)
 119                 return i;
 120
 121         TotalEvents += nget;
 122
 123         for (i = 0; i < nget; i++)
 124         {
 125                 switch (this->events[i].portev_source)
 126                 {
 127                         case PORT_SOURCE_FD:
 128                         {
 129                                 int fd = this->events[i].portev_object;
 130                                 EventHandler* eh = ref[fd];
 131                                 if (eh)
 132                                 {
 133                                         int mask = eh->GetEventMask();
 134                                         if (events[i].portev_events & POLLWRNORM)
 135                                                 mask &= ~(FD_WRITE_WILL_BLOCK | FD_WANT_FAST_WRITE | FD_WANT_SINGLE_WRITE);
 136                                         if (events[i].portev_events & POLLRDNORM)
 137                                                 mask &= ~FD_READ_WILL_BLOCK;
 138                                         // reinsert port for next time around, pretending to be one-shot for writes
 139                                         SetEventMask(ev, mask);
 140                                         port_associate(EngineHandle, PORT_SOURCE_FD, fd, mask_to_events(mask), eh);
 141                                         if (events[i].portev_events & POLLRDNORM)
 142                                         {
 143                                                 ReadEvents++;
 144                                                 eh->HandleEvent(EVENT_READ);
 145                                         }
 146                                         if (events[i].portev_events & POLLWRNORM)
 147                                         {
 148                                                 WriteEvents++;
 149                                                 eh->HandleEvent(EVENT_WRITE);
 150                                         }
 151                                 }
 152                         }
 153                         default:
 154                         break;
 155                 }
 156         }
 157
 158         return i;
 159 }
 160
 161 std::string PortsEngine::GetName()
 162 {
 163         return "ports";
 164 }
 165