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         ref[fd] = type;
  54         if (readable)
  55         {
  56                 log(DEBUG,"Set readbit");
  57                 ref[fd] |= X_READBIT;
  58         }
  59         log(DEBUG,"Add socket %d",fd);
  60
  61         CurrentSetSize++;
  62         return true;
  63 }
  64
  65 bool SelectEngine::DelFd(int fd)
  66 {
  67         log(DEBUG,"SelectEngine::DelFd(%d)",fd);
  68
  69         if ((fd < 0) || (fd > MAX_DESCRIPTORS))
  70                 return false;
  71
  72         std::map<int,int>::iterator t = fds.find(fd);
  73         if (t != fds.end())
  74         {
  75                 fds.erase(t);
  76                 log(DEBUG,"Deleted fd %d",fd);
  77         }
  78
  79         CurrentSetSize--;
  80         ref[fd] = 0;
  81         return true;
  82 }
  83
  84 int SelectEngine::GetMaxFds()
  85 {
  86         return FD_SETSIZE;
  87 }
  88
  89 int SelectEngine::GetRemainingFds()
  90 {
  91         return FD_SETSIZE - CurrentSetSize;
  92 }
  93
  94 int SelectEngine::Wait(int* fdlist)
  95 {
  96         int result = 0;
  97
  98         FD_ZERO(&wfdset);
  99         FD_ZERO(&rfdset);
 100         timeval tval;
 101         int sresult;
 102         for (std::map<int,int>::iterator a = fds.begin(); a != fds.end(); a++)
 103         {
 104                 if (ref[a->second] & X_READBIT)
 105                 {
 106                         FD_SET (a->second, &rfdset);
 107                 }
 108                 else
 109                 {
 110                         FD_SET (a->second, &wfdset);
 111                 }
 112
 113         }
 114         tval.tv_sec = 0;
 115         tval.tv_usec = 50L;
 116         sresult = select(FD_SETSIZE, &rfdset, &wfdset, NULL, &tval);
 117         if (sresult > 0)
 118         {
 119                 for (std::map<int,int>::iterator a = fds.begin(); a != fds.end(); a++)
 120                 {
 121                         if ((FD_ISSET (a->second, &rfdset)) || (FD_ISSET (a->second, &wfdset)))
 122                                 fdlist[result++] = a->second;
 123                 }
 124         }
 125
 126         return result;
 127 }
 128
 129 std::string SelectEngine::GetName()
 130 {
 131         return "select";
 132 }