src/socketengine_select.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd is copyright (C) 2002-2006 ChatSpike-Dev.
   6  *                       E-mail:
   7  *                <brain@chatspike.net>
   8  *                <Craig@chatspike.net>
   9  *
  10  * Written by Craig Edwards, Craig McLure, and others.
  11  * This program is free but copyrighted software; see
  12  *            the file COPYING for details.
  13  *
  14  * ---------------------------------------------------
  15  */
  16
  17 #include "inspircd_config.h"
  18 #include "globals.h"
  19 #include "inspircd.h"
  20 #include <vector>
  21 #include <string>
  22 #include <sys/select.h>
  23 #include "socketengine_select.h"
  24 #include "helperfuncs.h"
  25
  26 SelectEngine::SelectEngine()
  27 {
  28         log(DEBUG,"SelectEngine::SelectEngine()");
  29         EngineHandle = 0;
  30         CurrentSetSize = 0;
  31 }
  32
  33 SelectEngine::~SelectEngine()
  34 {
  35         log(DEBUG,"SelectEngine::~SelectEngine()");
  36 }
  37
  38 bool SelectEngine::AddFd(int fd, bool readable, char type)
  39 {
  40         if ((fd < 0) || (fd > MAX_DESCRIPTORS))
  41         {
  42                 log(DEFAULT,"ERROR: FD of %d added above max of %d",fd,MAX_DESCRIPTORS);
  43                 return false;
  44         }
  45         if (GetRemainingFds() <= 1)
  46         {
  47                 log(DEFAULT,"ERROR: System out of file descriptors!");
  48                 return false;
  49         }
  50
  51         fds[fd] = fd;
  52
  53         if (ref[fd])
  54                 return false;
  55
  56         ref[fd] = type;
  57         if (readable)
  58         {
  59                 log(DEBUG,"Set readbit");
  60                 ref[fd] |= X_READBIT;
  61         }
  62         log(DEBUG,"Add socket %d",fd);
  63
  64         CurrentSetSize++;
  65         return true;
  66 }
  67
  68 bool SelectEngine::DelFd(int fd)
  69 {
  70         log(DEBUG,"SelectEngine::DelFd(%d)",fd);
  71
  72         if ((fd < 0) || (fd > MAX_DESCRIPTORS))
  73                 return false;
  74
  75         std::map<int,int>::iterator t = fds.find(fd);
  76         if (t != fds.end())
  77         {
  78                 fds.erase(t);
  79                 log(DEBUG,"Deleted fd %d",fd);
  80         }
  81
  82         CurrentSetSize--;
  83         ref[fd] = 0;
  84         return true;
  85 }
  86
  87 int SelectEngine::GetMaxFds()
  88 {
  89         return FD_SETSIZE;
  90 }
  91
  92 int SelectEngine::GetRemainingFds()
  93 {
  94         return FD_SETSIZE - CurrentSetSize;
  95 }
  96
  97 int SelectEngine::Wait(int* fdlist)
  98 {
  99         int result = 0;
 100
 101         FD_ZERO(&wfdset);
 102         FD_ZERO(&rfdset);
 103         timeval tval;
 104         int sresult;
 105         for (std::map<int,int>::iterator a = fds.begin(); a != fds.end(); a++)
 106         {
 107                 if (ref[a->second] & X_READBIT)
 108                 {
 109                         FD_SET (a->second, &rfdset);
 110                 }
 111                 else
 112                 {
 113                         FD_SET (a->second, &wfdset);
 114                 }
 115
 116         }
 117         tval.tv_sec = 0;
 118         tval.tv_usec = 50L;
 119         sresult = select(FD_SETSIZE, &rfdset, &wfdset, NULL, &tval);
 120         if (sresult > 0)
 121         {
 122                 for (std::map<int,int>::iterator a = fds.begin(); a != fds.end(); a++)
 123                 {
 124                         if ((FD_ISSET (a->second, &rfdset)) || (FD_ISSET (a->second, &wfdset)))
 125                                 fdlist[result++] = a->second;
 126                 }
 127         }
 128
 129         return result;
 130 }
 131
 132 std::string SelectEngine::GetName()
 133 {
 134         return "select";
 135 }