[xonotic/darkplaces.git] / host.c

/*
Copyright (C) 1996-1997 Id Software, Inc.

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/
// host.c -- coordinates spawning and killing of local servers

#include "quakedef.h"

#include <time.h>
#include "libcurl.h"
#include "cdaudio.h"
#include "cl_video.h"
#include "progsvm.h"
#include "csprogs.h"
#include "sv_demo.h"
#include "snd_main.h"
#include "thread.h"

/*

A server can always be started, even if the system started out as a client
to a remote system.

A client can NOT be started if the system started as a dedicated server.

Memory is cleared / released when a server or client begins, not when they end.

*/

// how many frames have occurred
// (checked by Host_Error and Host_SaveConfig_f)
int host_framecount = 0;
// LordHavoc: set when quit is executed
qboolean host_shuttingdown = false;

// the real time since application started, without any slowmo or clamping
double realtime;

// current client
client_t *host_client;

jmp_buf host_abortframe;
double host_starttime = 0;

// pretend frames take this amount of time (in seconds), 0 = realtime
cvar_t host_framerate = {0, "host_framerate","0", "locks frame timing to this value in seconds, 0.05 is 20fps for example, note that this can easily run too fast, use cl_maxfps if you want to limit your framerate instead, or sys_ticrate to limit server speed"};
cvar_t cl_maxphysicsframesperserverframe = {0, "cl_maxphysicsframesperserverframe","10", "maximum number of physics frames per server frame"};
// shows time used by certain subsystems
cvar_t host_speeds = {0, "host_speeds","0", "reports how much time is used in server/graphics/sound"};
cvar_t host_maxwait = {0, "host_maxwait","1000", "maximum sleep time requested from the operating system in millisecond. Larger sleeps will be done using multiple host_maxwait length sleeps. Lowering this value will increase CPU load, but may help working around problems with accuracy of sleep times."};
cvar_t cl_minfps = {CVAR_SAVE, "cl_minfps", "40", "minimum fps target - while the rendering performance is below this, it will drift toward lower quality"};
cvar_t cl_minfps_fade = {CVAR_SAVE, "cl_minfps_fade", "0.2", "how fast the quality adapts to varying framerate"};
cvar_t cl_minfps_qualitymax = {CVAR_SAVE, "cl_minfps_qualitymax", "1", "highest allowed drawdistance multiplier"};
cvar_t cl_minfps_qualitymin = {CVAR_SAVE, "cl_minfps_qualitymin", "0.25", "lowest allowed drawdistance multiplier"};
cvar_t cl_minfps_qualitypower = {CVAR_SAVE, "cl_minfps_qualitypower", "4", "raises quality value to a power of itself, higher values make quality drop more sharply in relation to framerate"};
cvar_t cl_minfps_qualityscale = {CVAR_SAVE, "cl_minfps_qualityscale", "0.5", "multiplier for quality"};
cvar_t cl_maxfps = {CVAR_SAVE, "cl_maxfps", "0", "maximum fps cap, 0 = unlimited, if game is running faster than this it will wait before running another frame (useful to make cpu time available to other programs)"};
cvar_t cl_maxfps_alwayssleep = {0, "cl_maxfps_alwayssleep","1", "gives up some processing time to other applications each frame, value in milliseconds, disabled if cl_maxfps is 0"};
cvar_t cl_maxidlefps = {CVAR_SAVE, "cl_maxidlefps", "20", "maximum fps cap when the game is not the active window (makes cpu time available to other programs"};

cvar_t developer = {CVAR_SAVE, "developer","0", "shows debugging messages and information (recommended for all developers and level designers); the value -1 also suppresses buffering and logging these messages"};
cvar_t developer_extra = {0, "developer_extra", "0", "prints additional debugging messages, often very verbose!"};
cvar_t developer_insane = {0, "developer_insane", "0", "prints huge streams of information about internal workings, entire contents of files being read/written, etc.  Not recommended!"};
cvar_t developer_loadfile = {0, "developer_loadfile","0", "prints name and size of every file loaded via the FS_LoadFile function (which is almost everything)"};
cvar_t developer_loading = {0, "developer_loading","0", "prints information about files as they are loaded or unloaded successfully"};
cvar_t developer_entityparsing = {0, "developer_entityparsing", "0", "prints detailed network entities information each time a packet is received"};

cvar_t timestamps = {CVAR_SAVE, "timestamps", "0", "prints timestamps on console messages"};
cvar_t timeformat = {CVAR_SAVE, "timeformat", "[%Y-%m-%d %H:%M:%S] ", "time format to use on timestamped console messages"};

cvar_t sessionid = {CVAR_READONLY, "sessionid", "", "ID of the current session (use the -sessionid parameter to set it); this is always either empty or begins with a dot (.)"};
cvar_t locksession = {0, "locksession", "0", "Lock the session? 0 = no, 1 = yes and abort on failure, 2 = yes and continue on failure"};

/*
================
Host_AbortCurrentFrame

aborts the current host frame and goes on with the next one
================
*/
void Host_AbortCurrentFrame(void)
{
        // in case we were previously nice, make us mean again
        Sys_MakeProcessMean();

        longjmp (host_abortframe, 1);
}

/*
================
Host_Error

This shuts down both the client and server
================
*/
void Host_Error (const char *error, ...)
{
        static char hosterrorstring1[MAX_INPUTLINE];
        static char hosterrorstring2[MAX_INPUTLINE];
        static qboolean hosterror = false;
        va_list argptr;

        // turn off rcon redirect if it was active when the crash occurred
        // to prevent loops when it is a networking problem
        Con_Rcon_Redirect_Abort();

        va_start (argptr,error);
        dpvsnprintf (hosterrorstring1,sizeof(hosterrorstring1),error,argptr);
        va_end (argptr);

        Con_Printf("Host_Error: %s\n", hosterrorstring1);

        // LordHavoc: if crashing very early, or currently shutting down, do
        // Sys_Error instead
        if (host_framecount < 3 || host_shuttingdown)
                Sys_Error ("Host_Error: %s", hosterrorstring1);

        if (hosterror)
                Sys_Error ("Host_Error: recursively entered (original error was: %s    new error is: %s)", hosterrorstring2, hosterrorstring1);
        hosterror = true;

        strlcpy(hosterrorstring2, hosterrorstring1, sizeof(hosterrorstring2));

        CL_Parse_DumpPacket();

        CL_Parse_ErrorCleanUp();

        //PR_Crash();

        // print out where the crash happened, if it was caused by QC (and do a cleanup)
        PRVM_Crash();


        Host_ShutdownServer ();

        if (cls.state == ca_dedicated)
                Sys_Error ("Host_Error: %s",hosterrorstring2);  // dedicated servers exit

        CL_Disconnect ();
        cls.demonum = -1;

        hosterror = false;

        Host_AbortCurrentFrame();
}

void Host_ServerOptions (void)
{
        int i;

        // general default
        svs.maxclients = 8;

// COMMANDLINEOPTION: Server: -dedicated [playerlimit] starts a dedicated server (with a command console), default playerlimit is 8
// COMMANDLINEOPTION: Server: -listen [playerlimit] starts a multiplayer server with graphical client, like singleplayer but other players can connect, default playerlimit is 8
        // if no client is in the executable or -dedicated is specified on
        // commandline, start a dedicated server
        i = COM_CheckParm ("-dedicated");
        if (i || !cl_available)
        {
                cls.state = ca_dedicated;
                // check for -dedicated specifying how many players
                if (i && i + 1 < com_argc && atoi (com_argv[i+1]) >= 1)
                        svs.maxclients = atoi (com_argv[i+1]);
                if (COM_CheckParm ("-listen"))
                        Con_Printf ("Only one of -dedicated or -listen can be specified\n");
                // default sv_public on for dedicated servers (often hosted by serious administrators), off for listen servers (often hosted by clueless users)
                Cvar_SetValue("sv_public", 1);
        }
        else if (cl_available)
        {
                // client exists and not dedicated, check if -listen is specified
                cls.state = ca_disconnected;
                i = COM_CheckParm ("-listen");
                if (i)
                {
                        // default players unless specified
                        if (i + 1 < com_argc && atoi (com_argv[i+1]) >= 1)
                                svs.maxclients = atoi (com_argv[i+1]);
                }
                else
                {
                        // default players in some games, singleplayer in most
                        if (gamemode != GAME_GOODVSBAD2 && gamemode != GAME_NEXUIZ && gamemode != GAME_XONOTIC && gamemode != GAME_BATTLEMECH)
                                svs.maxclients = 1;
                }
        }

        svs.maxclients = svs.maxclients_next = bound(1, svs.maxclients, MAX_SCOREBOARD);

        svs.clients = (client_t *)Mem_Alloc(sv_mempool, sizeof(client_t) * svs.maxclients);

        if (svs.maxclients > 1 && !deathmatch.integer && !coop.integer)
                Cvar_SetValueQuick(&deathmatch, 1);
}

/*
=======================
Host_InitLocal
======================
*/
void Host_SaveConfig_f(void);
void Host_LoadConfig_f(void);
extern cvar_t sv_writepicture_quality;
extern cvar_t r_texture_jpeg_fastpicmip;
static void Host_InitLocal (void)
{
        Cmd_AddCommand("saveconfig", Host_SaveConfig_f, "save settings to config.cfg (or a specified filename) immediately (also automatic when quitting)");
        Cmd_AddCommand("loadconfig", Host_LoadConfig_f, "reset everything and reload configs");

        Cvar_RegisterVariable (&cl_maxphysicsframesperserverframe);
        Cvar_RegisterVariable (&host_framerate);
        Cvar_RegisterVariable (&host_speeds);
        Cvar_RegisterVariable (&host_maxwait);
        Cvar_RegisterVariable (&cl_minfps);
        Cvar_RegisterVariable (&cl_minfps_fade);
        Cvar_RegisterVariable (&cl_minfps_qualitymax);
        Cvar_RegisterVariable (&cl_minfps_qualitymin);
        Cvar_RegisterVariable (&cl_minfps_qualitypower);
        Cvar_RegisterVariable (&cl_minfps_qualityscale);
        Cvar_RegisterVariable (&cl_maxfps);
        Cvar_RegisterVariable (&cl_maxfps_alwayssleep);
        Cvar_RegisterVariable (&cl_maxidlefps);

        Cvar_RegisterVariable (&developer);
        Cvar_RegisterVariable (&developer_extra);
        Cvar_RegisterVariable (&developer_insane);
        Cvar_RegisterVariable (&developer_loadfile);
        Cvar_RegisterVariable (&developer_loading);
        Cvar_RegisterVariable (&developer_entityparsing);

        Cvar_RegisterVariable (&timestamps);
        Cvar_RegisterVariable (&timeformat);

        Cvar_RegisterVariable (&sv_writepicture_quality);
        Cvar_RegisterVariable (&r_texture_jpeg_fastpicmip);
}


/*
===============
Host_SaveConfig_f

Writes key bindings and archived cvars to config.cfg
===============
*/
void Host_SaveConfig_to(const char *file)
{
        qfile_t *f;

// dedicated servers initialize the host but don't parse and set the
// config.cfg cvars
        // LordHavoc: don't save a config if it crashed in startup
        if (host_framecount >= 3 && cls.state != ca_dedicated && !COM_CheckParm("-benchmark") && !COM_CheckParm("-capturedemo"))
        {
                f = FS_OpenRealFile(file, "wb", false);
                if (!f)
                {
                        Con_Printf("Couldn't write %s.\n", file);
                        return;
                }

                Key_WriteBindings (f);
                Cvar_WriteVariables (f);

                FS_Close (f);
        }
}
void Host_SaveConfig(void)
{
        Host_SaveConfig_to(CONFIGFILENAME);
}
void Host_SaveConfig_f(void)
{
        const char *file = CONFIGFILENAME;

        if(Cmd_Argc() >= 2) {
                file = Cmd_Argv(1);
                Con_Printf("Saving to %s\n", file);
        }

        Host_SaveConfig_to(file);
}

void Host_AddConfigText(void)
{
        // set up the default startmap_sp and startmap_dm aliases (mods can
        // override these) and then execute the quake.rc startup script
        if (gamemode == GAME_NEHAHRA)
                Cbuf_InsertText("alias startmap_sp \"map nehstart\"\nalias startmap_dm \"map nehstart\"\nexec " STARTCONFIGFILENAME "\n");
        else if (gamemode == GAME_TRANSFUSION)
                Cbuf_InsertText("alias startmap_sp \"map e1m1\"\n""alias startmap_dm \"map bb1\"\nexec " STARTCONFIGFILENAME "\n");
        else if (gamemode == GAME_TEU)
                Cbuf_InsertText("alias startmap_sp \"map start\"\nalias startmap_dm \"map start\"\nexec teu.rc\n");
        else
                Cbuf_InsertText("alias startmap_sp \"map start\"\nalias startmap_dm \"map start\"\nexec " STARTCONFIGFILENAME "\n");
}

/*
===============
Host_LoadConfig_f

Resets key bindings and cvars to defaults and then reloads scripts
===============
*/
void Host_LoadConfig_f(void)
{
        // reset all cvars, commands and aliases to init values
        Cmd_RestoreInitState();
        // prepend a menu restart command to execute after the config
        Cbuf_InsertText("\nmenu_restart\n");
        // reset cvars to their defaults, and then exec startup scripts again
        Host_AddConfigText();
}

/*
=================
SV_ClientPrint

Sends text across to be displayed
FIXME: make this just a stuffed echo?
=================
*/
void SV_ClientPrint(const char *msg)
{
        if (host_client->netconnection)
        {
                MSG_WriteByte(&host_client->netconnection->message, svc_print);
                MSG_WriteString(&host_client->netconnection->message, msg);
        }
}

/*
=================
SV_ClientPrintf

Sends text across to be displayed
FIXME: make this just a stuffed echo?
=================
*/
void SV_ClientPrintf(const char *fmt, ...)
{
        va_list argptr;
        char msg[MAX_INPUTLINE];

        va_start(argptr,fmt);
        dpvsnprintf(msg,sizeof(msg),fmt,argptr);
        va_end(argptr);

        SV_ClientPrint(msg);
}

/*
=================
SV_BroadcastPrint

Sends text to all active clients
=================
*/
void SV_BroadcastPrint(const char *msg)
{
        int i;
        client_t *client;

        for (i = 0, client = svs.clients;i < svs.maxclients;i++, client++)
        {
                if (client->active && client->netconnection)
                {
                        MSG_WriteByte(&client->netconnection->message, svc_print);
                        MSG_WriteString(&client->netconnection->message, msg);
                }
        }

        if (sv_echobprint.integer && cls.state == ca_dedicated)
                Con_Print(msg);
}

/*
=================
SV_BroadcastPrintf

Sends text to all active clients
=================
*/
void SV_BroadcastPrintf(const char *fmt, ...)
{
        va_list argptr;
        char msg[MAX_INPUTLINE];

        va_start(argptr,fmt);
        dpvsnprintf(msg,sizeof(msg),fmt,argptr);
        va_end(argptr);

        SV_BroadcastPrint(msg);
}

/*
=================
Host_ClientCommands

Send text over to the client to be executed
=================
*/
void Host_ClientCommands(const char *fmt, ...)
{
        va_list argptr;
        char string[MAX_INPUTLINE];

        if (!host_client->netconnection)
                return;

        va_start(argptr,fmt);
        dpvsnprintf(string, sizeof(string), fmt, argptr);
        va_end(argptr);

        MSG_WriteByte(&host_client->netconnection->message, svc_stufftext);
        MSG_WriteString(&host_client->netconnection->message, string);
}

/*
=====================
SV_DropClient

Called when the player is getting totally kicked off the host
if (crash = true), don't bother sending signofs
=====================
*/
void SV_DropClient(qboolean crash)
{
        int i;
        Con_Printf("Client \"%s\" dropped\n", host_client->name);

        SV_StopDemoRecording(host_client);

        // make sure edict is not corrupt (from a level change for example)
        host_client->edict = PRVM_EDICT_NUM(host_client - svs.clients + 1);

        if (host_client->netconnection)
        {
                // tell the client to be gone
                if (!crash)
                {
                        // LordHavoc: no opportunity for resending, so use unreliable 3 times
                        unsigned char bufdata[8];
                        sizebuf_t buf;
                        memset(&buf, 0, sizeof(buf));
                        buf.data = bufdata;
                        buf.maxsize = sizeof(bufdata);
                        MSG_WriteByte(&buf, svc_disconnect);
                        NetConn_SendUnreliableMessage(host_client->netconnection, &buf, sv.protocol, 10000, false);
                        NetConn_SendUnreliableMessage(host_client->netconnection, &buf, sv.protocol, 10000, false);
                        NetConn_SendUnreliableMessage(host_client->netconnection, &buf, sv.protocol, 10000, false);
                }
        }

        // call qc ClientDisconnect function
        // LordHavoc: don't call QC if server is dead (avoids recursive
        // Host_Error in some mods when they run out of edicts)
        if (host_client->clientconnectcalled && sv.active && host_client->edict)
        {
                // call the prog function for removing a client
                // this will set the body to a dead frame, among other things
                int saveSelf = PRVM_serverglobaledict(self);
                host_client->clientconnectcalled = false;
                PRVM_serverglobaledict(self) = PRVM_EDICT_TO_PROG(host_client->edict);
                PRVM_ExecuteProgram(PRVM_serverfunction(ClientDisconnect), "QC function ClientDisconnect is missing");
                PRVM_serverglobaledict(self) = saveSelf;
        }

        if (host_client->netconnection)
        {
                // break the net connection
                NetConn_Close(host_client->netconnection);
                host_client->netconnection = NULL;
        }

        // if a download is active, close it
        if (host_client->download_file)
        {
                Con_DPrintf("Download of %s aborted when %s dropped\n", host_client->download_name, host_client->name);
                FS_Close(host_client->download_file);
                host_client->download_file = NULL;
                host_client->download_name[0] = 0;
                host_client->download_expectedposition = 0;
                host_client->download_started = false;
        }

        // remove leaving player from scoreboard
        host_client->name[0] = 0;
        host_client->colors = 0;
        host_client->frags = 0;
        // send notification to all clients
        // get number of client manually just to make sure we get it right...
        i = host_client - svs.clients;
        MSG_WriteByte (&sv.reliable_datagram, svc_updatename);
        MSG_WriteByte (&sv.reliable_datagram, i);
        MSG_WriteString (&sv.reliable_datagram, host_client->name);
        MSG_WriteByte (&sv.reliable_datagram, svc_updatecolors);
        MSG_WriteByte (&sv.reliable_datagram, i);
        MSG_WriteByte (&sv.reliable_datagram, host_client->colors);
        MSG_WriteByte (&sv.reliable_datagram, svc_updatefrags);
        MSG_WriteByte (&sv.reliable_datagram, i);
        MSG_WriteShort (&sv.reliable_datagram, host_client->frags);

        // free the client now
        if (host_client->entitydatabase)
                EntityFrame_FreeDatabase(host_client->entitydatabase);
        if (host_client->entitydatabase4)
                EntityFrame4_FreeDatabase(host_client->entitydatabase4);
        if (host_client->entitydatabase5)
                EntityFrame5_FreeDatabase(host_client->entitydatabase5);

        if (sv.active)
        {
                // clear a fields that matter to DP_SV_CLIENTNAME and DP_SV_CLIENTCOLORS, and also frags
                PRVM_ED_ClearEdict(host_client->edict);
        }

        // clear the client struct (this sets active to false)
        memset(host_client, 0, sizeof(*host_client));

        // update server listing on the master because player count changed
        // (which the master uses for filtering empty/full servers)
        NetConn_Heartbeat(1);

        if (sv.loadgame)
        {
                for (i = 0;i < svs.maxclients;i++)
                        if (svs.clients[i].active && !svs.clients[i].spawned)
                                break;
                if (i == svs.maxclients)
                {
                        Con_Printf("Loaded game, everyone rejoined - unpausing\n");
                        sv.paused = sv.loadgame = false; // we're basically done with loading now
                }
        }
}

/*
==================
Host_ShutdownServer

This only happens at the end of a game, not between levels
==================
*/
void Host_ShutdownServer(void)
{
        int i;

        Con_DPrintf("Host_ShutdownServer\n");

        if (!sv.active)
                return;

        NetConn_Heartbeat(2);
        NetConn_Heartbeat(2);

// make sure all the clients know we're disconnecting
        SV_VM_Begin();
        World_End(&sv.world);
        if(prog->loaded)
                if(PRVM_serverfunction(SV_Shutdown))
                {
                        func_t s = PRVM_serverfunction(SV_Shutdown);
                        PRVM_serverfunction(SV_Shutdown) = 0; // prevent it from getting called again
                        PRVM_ExecuteProgram(s,"SV_Shutdown() required");
                }
        for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
                if (host_client->active)
                        SV_DropClient(false); // server shutdown
        SV_VM_End();

        NetConn_CloseServerPorts();

        sv.active = false;
//
// clear structures
//
        memset(&sv, 0, sizeof(sv));
        memset(svs.clients, 0, svs.maxclients*sizeof(client_t));
}


//============================================================================

/*
===================
Host_GetConsoleCommands

Add them exactly as if they had been typed at the console
===================
*/
void Host_GetConsoleCommands (void)
{
        char *cmd;

        while (1)
        {
                cmd = Sys_ConsoleInput ();
                if (!cmd)
                        break;
                Cbuf_AddText (cmd);
        }
}

/*
==================
Host_TimeReport

Returns a time report string, for example for
==================
*/
const char *Host_TimingReport(void)
{
        return va("%.1f%% CPU, %.2f%% lost, offset avg %.1fms, max %.1fms, sdev %.1fms", svs.perf_cpuload * 100, svs.perf_lost * 100, svs.perf_offset_avg * 1000, svs.perf_offset_max * 1000, svs.perf_offset_sdev * 1000);
}

/*
==================
Host_Frame

Runs all active servers
==================
*/
static void Host_Init(void);
void Host_Main(void)
{
        double time1 = 0;
        double time2 = 0;
        double time3 = 0;
        double cl_timer, sv_timer;
        double clframetime, deltarealtime, oldrealtime;
        double wait;
        int pass1, pass2, pass3, i;

        Host_Init();

        cl_timer = 0;
        sv_timer = 0;

        realtime = host_starttime = Sys_DoubleTime();
        for (;;)
        {
                if (setjmp(host_abortframe))
                {
                        SCR_ClearLoadingScreen(false);
                        continue;                       // something bad happened, or the server disconnected
                }

                oldrealtime = realtime;
                realtime = Sys_DoubleTime();

                deltarealtime = realtime - oldrealtime;
                cl_timer += deltarealtime;
                sv_timer += deltarealtime;

                svs.perf_acc_realtime += deltarealtime;

                // Look for clients who have spawned
                for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
                        if(host_client->spawned)
                                if(host_client->netconnection)
                                        break;
                if(i == svs.maxclients)
                {
                        // Nobody is looking? Then we won't do timing...
                        // Instead, reset it to zero
                        svs.perf_acc_realtime = svs.perf_acc_sleeptime = svs.perf_acc_lost = svs.perf_acc_offset = svs.perf_acc_offset_squared = svs.perf_acc_offset_max = svs.perf_acc_offset_samples = 0;
                }
                else if(svs.perf_acc_realtime > 5)
                {
                        svs.perf_cpuload = 1 - svs.perf_acc_sleeptime / svs.perf_acc_realtime;
                        svs.perf_lost = svs.perf_acc_lost / svs.perf_acc_realtime;
                        if(svs.perf_acc_offset_samples > 0)
                        {
                                svs.perf_offset_max = svs.perf_acc_offset_max;
                                svs.perf_offset_avg = svs.perf_acc_offset / svs.perf_acc_offset_samples;
                                svs.perf_offset_sdev = sqrt(svs.perf_acc_offset_squared / svs.perf_acc_offset_samples - svs.perf_offset_avg * svs.perf_offset_avg);
                        }
                        if(svs.perf_lost > 0 && developer_extra.integer)
                                Con_DPrintf("Server can't keep up: %s\n", Host_TimingReport());
                        svs.perf_acc_realtime = svs.perf_acc_sleeptime = svs.perf_acc_lost = svs.perf_acc_offset = svs.perf_acc_offset_squared = svs.perf_acc_offset_max = svs.perf_acc_offset_samples = 0;
                }

                if (slowmo.value < 0.00001 && slowmo.value != 0)
                        Cvar_SetValue("slowmo", 0);
                if (host_framerate.value < 0.00001 && host_framerate.value != 0)
                        Cvar_SetValue("host_framerate", 0);

                // keep the random time dependent, but not when playing demos/benchmarking
                if(!*sv_random_seed.string && !cls.demoplayback)
                        rand();

                cl.islocalgame = NetConn_IsLocalGame();

                // get new key events
                Key_EventQueue_Unblock();
                SndSys_SendKeyEvents();
                Sys_SendKeyEvents();

                NetConn_UpdateSockets();

                Log_DestBuffer_Flush();

                // receive packets on each main loop iteration, as the main loop may
                // be undersleeping due to select() detecting a new packet
                if (sv.active)
                        NetConn_ServerFrame();

                Curl_Run();

                // check for commands typed to the host
                Host_GetConsoleCommands();

                // when a server is running we only execute console commands on server frames
                // (this mainly allows frikbot .way config files to work properly by staying in sync with the server qc)
                // otherwise we execute them on client frames
                if (sv.active ? sv_timer > 0 : cl_timer > 0)
                {
                        // process console commands
//                      R_TimeReport("preconsole");
                        CL_VM_PreventInformationLeaks();
                        Cbuf_Execute();
//                      R_TimeReport("console");
                }

                //Con_Printf("%6.0f %6.0f\n", cl_timer * 1000000.0, sv_timer * 1000000.0);

                // if the accumulators haven't become positive yet, wait a while
                if (cls.state == ca_dedicated)
                        wait = sv_timer * -1000000.0;
                else if (!sv.active)
                        wait = cl_timer * -1000000.0;
                else
                        wait = max(cl_timer, sv_timer) * -1000000.0;

                if (!cls.timedemo && wait >= 1)
                {
                        double time0;

                        if(host_maxwait.value <= 0)
                                wait = min(wait, 1000000.0);
                        else
                                wait = min(wait, host_maxwait.value * 1000.0);
                        if(wait < 1)
                                wait = 1; // because we cast to int

                        time0 = Sys_DoubleTime();
                        if (sv_checkforpacketsduringsleep.integer && !sys_usenoclockbutbenchmark.integer)
                                NetConn_SleepMicroseconds((int)wait);
                        else
                                Sys_Sleep((int)wait);
                        svs.perf_acc_sleeptime += Sys_DoubleTime() - time0;
//                      R_TimeReport("sleep");
                        continue;
                }

                R_TimeReport("---");

        //-------------------
        //
        // server operations
        //
        //-------------------

                // limit the frametime steps to no more than 100ms each
                if (cl_timer > 0.1)
                        cl_timer = 0.1;
                if (sv_timer > 0.1)
                {
                        svs.perf_acc_lost += (sv_timer - 0.1);
                        sv_timer = 0.1;
                }

                if (sv.active && sv_timer > 0)
                {
                        // execute one or more server frames, with an upper limit on how much
                        // execution time to spend on server frames to avoid freezing the game if
                        // the server is overloaded, this execution time limit means the game will
                        // slow down if the server is taking too long.
                        int framecount, framelimit = 1;
                        double advancetime, aborttime = 0;
                        float offset;

                        if (cls.state == ca_dedicated)
                                Collision_Cache_NewFrame();

                        // run the world state
                        // don't allow simulation to run too fast or too slow or logic glitches can occur

                        // stop running server frames if the wall time reaches this value
                        if (sys_ticrate.value <= 0)
                                advancetime = sv_timer;
                        else if (cl.islocalgame && !sv_fixedframeratesingleplayer.integer)
                        {
                                // synchronize to the client frametime, but no less than 10ms and no more than 100ms
                                advancetime = bound(0.01, cl_timer, 0.1);
                        }
                        else
                        {
                                advancetime = sys_ticrate.value;
                                // listen servers can run multiple server frames per client frame
                                framelimit = cl_maxphysicsframesperserverframe.integer;
                                aborttime = realtime + 0.1;
                        }
                        if(slowmo.value > 0 && slowmo.value < 1)
                                advancetime = min(advancetime, 0.1 / slowmo.value);
                        else
                                advancetime = min(advancetime, 0.1);

                        if(advancetime > 0)
                        {
                                offset = sv_timer + (Sys_DoubleTime() - realtime);
                                ++svs.perf_acc_offset_samples;
                                svs.perf_acc_offset += offset;
                                svs.perf_acc_offset_squared += offset * offset;
                                if(svs.perf_acc_offset_max < offset)
                                        svs.perf_acc_offset_max = offset;
                        }

                        // only advance time if not paused
                        // the game also pauses in singleplayer when menu or console is used
                        sv.frametime = advancetime * slowmo.value;
                        if (host_framerate.value)
                                sv.frametime = host_framerate.value;
                        if (sv.paused || (cl.islocalgame && (key_dest != key_game || key_consoleactive || cl.csqc_paused)))
                                sv.frametime = 0;

                        // setup the VM frame
                        SV_VM_Begin();

                        for (framecount = 0;framecount < framelimit && sv_timer > 0;framecount++)
                        {
                                sv_timer -= advancetime;

                                // move things around and think unless paused
                                if (sv.frametime)
                                        SV_Physics();

                                // if this server frame took too long, break out of the loop
                                if (framelimit > 1 && Sys_DoubleTime() >= aborttime)
                                        break;
                        }
                        R_TimeReport("serverphysics");

                        // send all messages to the clients
                        SV_SendClientMessages();
                        
                        if (sv.paused == 1 && realtime > sv.pausedstart && sv.pausedstart > 0) {
                                prog->globals.generic[OFS_PARM0] = realtime - sv.pausedstart;
                                PRVM_ExecuteProgram(PRVM_serverfunction(SV_PausedTic), "QC function SV_PausedTic is missing");
                        }

                        // end the server VM frame
                        SV_VM_End();

                        // send an heartbeat if enough time has passed since the last one
                        NetConn_Heartbeat(0);
                        R_TimeReport("servernetwork");
                }
                else
                {
                        // don't let r_speeds display jump around
                        R_TimeReport("serverphysics");
                        R_TimeReport("servernetwork");
                }

        //-------------------
        //
        // client operations
        //
        //-------------------

                if (cls.state != ca_dedicated && (cl_timer > 0 || cls.timedemo || ((vid_activewindow ? cl_maxfps : cl_maxidlefps).value < 1)))
                {
                        R_TimeReport("---");
                        Collision_Cache_NewFrame();
                        R_TimeReport("collisioncache");
                        // decide the simulation time
                        if (cls.capturevideo.active)
                        {
                                //***
                                if (cls.capturevideo.realtime)
                                        clframetime = cl.realframetime = max(cl_timer, 1.0 / cls.capturevideo.framerate);
                                else
                                {
                                        clframetime = 1.0 / cls.capturevideo.framerate;
                                        cl.realframetime = max(cl_timer, clframetime);
                                }
                        }
                        else if (vid_activewindow && cl_maxfps.value >= 1 && !cls.timedemo)
                        {
                                clframetime = cl.realframetime = max(cl_timer, 1.0 / cl_maxfps.value);
                                // when running slow, we need to sleep to keep input responsive
                                wait = bound(0, cl_maxfps_alwayssleep.value * 1000, 100000);
                                if (wait > 0)
                                        Sys_Sleep((int)wait);
                        }
                        else if (!vid_activewindow && cl_maxidlefps.value >= 1 && !cls.timedemo)
                                clframetime = cl.realframetime = max(cl_timer, 1.0 / cl_maxidlefps.value);
                        else
                                clframetime = cl.realframetime = cl_timer;

                        // apply slowmo scaling
                        clframetime *= cl.movevars_timescale;
                        // scale playback speed of demos by slowmo cvar
                        if (cls.demoplayback)
                        {
                                clframetime *= slowmo.value;
                                // if demo playback is paused, don't advance time at all
                                if (cls.demopaused)
                                        clframetime = 0;
                        }

                        // host_framerate overrides all else
                        if (host_framerate.value)
                                clframetime = host_framerate.value;

                        if (cl.paused || (cl.islocalgame && (key_dest != key_game || key_consoleactive || cl.csqc_paused)))
                                clframetime = 0;

                        if (cls.timedemo)
                                clframetime = cl.realframetime = cl_timer;

                        // deduct the frame time from the accumulator
                        cl_timer -= cl.realframetime;

                        cl.oldtime = cl.time;
                        cl.time += clframetime;

                        // update video
                        if (host_speeds.integer)
                                time1 = Sys_DoubleTime();
                        R_TimeReport("pre-input");

                        // Collect input into cmd
                        CL_Input();

                        R_TimeReport("input");

                        // check for new packets
                        NetConn_ClientFrame();

                        // read a new frame from a demo if needed
                        CL_ReadDemoMessage();
                        R_TimeReport("clientnetwork");

                        // now that packets have been read, send input to server
                        CL_SendMove();
                        R_TimeReport("sendmove");

                        // update client world (interpolate entities, create trails, etc)
                        CL_UpdateWorld();
                        R_TimeReport("lerpworld");

                        CL_Video_Frame();

                        R_TimeReport("client");

                        CL_UpdateScreen();
                        R_TimeReport("render");

                        if (host_speeds.integer)
                                time2 = Sys_DoubleTime();

                        // update audio
                        if(cl.csqc_usecsqclistener)
                        {
                                S_Update(&cl.csqc_listenermatrix);
                                cl.csqc_usecsqclistener = false;
                        }
                        else
                                S_Update(&r_refdef.view.matrix);

                        CDAudio_Update();
                        R_TimeReport("audio");

                        // reset gathering of mouse input
                        in_mouse_x = in_mouse_y = 0;

                        if (host_speeds.integer)
                        {
                                pass1 = (int)((time1 - time3)*1000000);
                                time3 = Sys_DoubleTime();
                                pass2 = (int)((time2 - time1)*1000000);
                                pass3 = (int)((time3 - time2)*1000000);
                                Con_Printf("%6ius total %6ius server %6ius gfx %6ius snd\n",
                                                        pass1+pass2+pass3, pass1, pass2, pass3);
                        }
                }

#if MEMPARANOIA
                Mem_CheckSentinelsGlobal();
#else
                if (developer_memorydebug.integer)
                        Mem_CheckSentinelsGlobal();
#endif

                // if there is some time remaining from this frame, reset the timers
                if (cl_timer >= 0)
                        cl_timer = 0;
                if (sv_timer >= 0)
                {
                        svs.perf_acc_lost += sv_timer;
                        sv_timer = 0;
                }

                host_framecount++;
        }
}

//============================================================================

qboolean vid_opened = false;
void Host_StartVideo(void)
{
        if (!vid_opened && cls.state != ca_dedicated)
        {
                vid_opened = true;
                // make sure we open sockets before opening video because the Windows Firewall "unblock?" dialog can screw up the graphics context on some graphics drivers
                NetConn_UpdateSockets();
                VID_Start();
                CDAudio_Startup();
        }
}

char engineversion[128];

qboolean sys_nostdout = false;

extern void u8_Init(void);
extern void Render_Init(void);
extern void Mathlib_Init(void);
extern void FS_Init_SelfPack(void);
extern void FS_Init(void);
extern void FS_Shutdown(void);
extern void PR_Cmd_Init(void);
extern void COM_Init_Commands(void);
extern void FS_Init_Commands(void);
extern qboolean host_stuffcmdsrun;

static qfile_t *locksession_fh = NULL;
static qboolean locksession_run = false;
static void Host_InitSession(void)
{
        int i;
        Cvar_RegisterVariable(&sessionid);
        Cvar_RegisterVariable(&locksession);

        // load the session ID into the read-only cvar
        if ((i = COM_CheckParm("-sessionid")) && (i + 1 < com_argc))
        {
                if(com_argv[i+1][0] == '.')
                        Cvar_SetQuick(&sessionid, com_argv[i+1]);
                else
                        Cvar_SetQuick(&sessionid, va(".%s", com_argv[i+1]));
        }
}
void Host_LockSession(void)
{
        if(locksession_run)
                return;
        locksession_run = true;
        if(locksession.integer != 0)
        {
                locksession_fh = FS_SysOpen(va("%slock%s", *fs_userdir ? fs_userdir : fs_basedir, sessionid.string), "wl", false);
                // TODO maybe write the pid into the lockfile, while we are at it? may help server management tools
                if(!locksession_fh)
                {
                        if(locksession.integer == 2)
                        {
                                Con_Printf("WARNING: session lock %slock%s could not be acquired. Please run with -sessionid and an unique session name. Continuing anyway.\n", *fs_userdir ? fs_userdir : fs_basedir, sessionid.string);
                        }
                        else
                        {
                                Sys_Error("session lock %slock%s could not be acquired. Please run with -sessionid and an unique session name.\n", *fs_userdir ? fs_userdir : fs_basedir, sessionid.string);
                        }
                }
        }
}
void Host_UnlockSession(void)
{
        if(!locksession_run)
                return;
        locksession_run = false;

        if(locksession_fh)
        {
                FS_Close(locksession_fh);
                // NOTE: we can NOT unlink the lock here, as doing so would
                // create a race condition if another process created it
                // between our close and our unlink
                locksession_fh = NULL;
        }
}

/*
====================
Host_Init
====================
*/
static void Host_Init (void)
{
        int i;
        const char* os;

        if (COM_CheckParm("-profilegameonly"))
                Sys_AllowProfiling(false);

        // LordHavoc: quake never seeded the random number generator before... heh
        if (COM_CheckParm("-benchmark"))
                srand(0); // predictable random sequence for -benchmark
        else
                srand((unsigned int)time(NULL));

        // FIXME: this is evil, but possibly temporary
        // LordHavoc: doesn't seem very temporary...
        // LordHavoc: made this a saved cvar
// COMMANDLINEOPTION: Console: -developer enables warnings and other notices (RECOMMENDED for mod developers)
        if (COM_CheckParm("-developer"))
        {
                developer.value = developer.integer = 1;
                developer.string = "1";
        }

        if (COM_CheckParm("-developer2") || COM_CheckParm("-developer3"))
        {
                developer.value = developer.integer = 1;
                developer.string = "1";
                developer_extra.value = developer_extra.integer = 1;
                developer_extra.string = "1";
                developer_insane.value = developer_insane.integer = 1;
                developer_insane.string = "1";
                developer_memory.value = developer_memory.integer = 1;
                developer_memory.string = "1";
                developer_memorydebug.value = developer_memorydebug.integer = 1;
                developer_memorydebug.string = "1";
        }

        if (COM_CheckParm("-developer3"))
        {
                gl_paranoid.integer = 1;gl_paranoid.string = "1";
                gl_printcheckerror.integer = 1;gl_printcheckerror.string = "1";
        }

// COMMANDLINEOPTION: Console: -nostdout disables text output to the terminal the game was launched from
        if (COM_CheckParm("-nostdout"))
                sys_nostdout = 1;

        // used by everything
        Memory_Init();

        // initialize console command/cvar/alias/command execution systems
        Cmd_Init();

        // initialize memory subsystem cvars/commands
        Memory_Init_Commands();

        // initialize console and logging and its cvars/commands
        Con_Init();

        // initialize various cvars that could not be initialized earlier
        u8_Init();
        Curl_Init_Commands();
        Cmd_Init_Commands();
        Sys_Init_Commands();
        COM_Init_Commands();
        FS_Init_Commands();

        // initialize console window (only used by sys_win.c)
        Sys_InitConsole();

        // initialize the self-pack (must be before COM_InitGameType as it may add command line options)
        FS_Init_SelfPack();

        // detect gamemode from commandline options or executable name
        COM_InitGameType();

        // construct a version string for the corner of the console
        os = DP_OS_NAME;
        dpsnprintf (engineversion, sizeof (engineversion), "%s %s %s", gamename, os, buildstring);
        Con_Printf("%s\n", engineversion);

        // initialize process nice level
        Sys_InitProcessNice();

        // initialize ixtable
        Mathlib_Init();

        // initialize filesystem (including fs_basedir, fs_gamedir, -game, scr_screenshot_name)
        FS_Init();

        // register the cvars for session locking
        Host_InitSession();

        // must be after FS_Init
        Crypto_Init();
        Crypto_Init_Commands();

        NetConn_Init();
        Curl_Init();
        //PR_Init();
        //PR_Cmd_Init();
        PRVM_Init();
        Mod_Init();
        World_Init();
        SV_Init();
        V_Init(); // some cvars needed by server player physics (cl_rollangle etc)
        Host_InitCommands();
        Host_InitLocal();
        Host_ServerOptions();

        Thread_Init();

        if (cls.state == ca_dedicated)
                Cmd_AddCommand ("disconnect", CL_Disconnect_f, "disconnect from server (or disconnect all clients if running a server)");
        else
        {
                Con_DPrintf("Initializing client\n");

                R_Modules_Init();
                Palette_Init();
                MR_Init_Commands();
                VID_Shared_Init();
                VID_Init();
                Render_Init();
                S_Init();
                CDAudio_Init();
                Key_Init();
                CL_Init();
        }

        // save off current state of aliases, commands and cvars for later restore if FS_GameDir_f is called
        // NOTE: menu commands are freed by Cmd_RestoreInitState
        Cmd_SaveInitState();

        // FIXME: put this into some neat design, but the menu should be allowed to crash
        // without crashing the whole game, so this should just be a short-time solution

        // here comes the not so critical stuff
        if (setjmp(host_abortframe)) {
                return;
        }

        Host_AddConfigText();
        Cbuf_Execute();

        // if stuffcmds wasn't run, then quake.rc is probably missing, use default
        if (!host_stuffcmdsrun)
        {
                Cbuf_AddText("exec default.cfg\nexec " CONFIGFILENAME "\nexec autoexec.cfg\nstuffcmds\n");
                Cbuf_Execute();
        }

        // put up the loading image so the user doesn't stare at a black screen...
        SCR_BeginLoadingPlaque();

        if (cls.state != ca_dedicated)
        {
                MR_Init();
        }

        // check for special benchmark mode
// COMMANDLINEOPTION: Client: -benchmark <demoname> runs a timedemo and quits, results of any timedemo can be found in gamedir/benchmark.log (for example id1/benchmark.log)
        i = COM_CheckParm("-benchmark");
        if (i && i + 1 < com_argc)
        if (!sv.active && !cls.demoplayback && !cls.connect_trying)
        {
                Cbuf_AddText(va("timedemo %s\n", com_argv[i + 1]));
                Cbuf_Execute();
        }

        // check for special demo mode
// COMMANDLINEOPTION: Client: -demo <demoname> runs a playdemo and quits
        i = COM_CheckParm("-demo");
        if (i && i + 1 < com_argc)
        if (!sv.active && !cls.demoplayback && !cls.connect_trying)
        {
                Cbuf_AddText(va("playdemo %s\n", com_argv[i + 1]));
                Cbuf_Execute();
        }

// COMMANDLINEOPTION: Client: -capturedemo <demoname> captures a playdemo and quits
        i = COM_CheckParm("-capturedemo");
        if (i && i + 1 < com_argc)
        if (!sv.active && !cls.demoplayback && !cls.connect_trying)
        {
                Cbuf_AddText(va("playdemo %s\ncl_capturevideo 1\n", com_argv[i + 1]));
                Cbuf_Execute();
        }

        if (cls.state == ca_dedicated || COM_CheckParm("-listen"))
        if (!sv.active && !cls.demoplayback && !cls.connect_trying)
        {
                Cbuf_AddText("startmap_dm\n");
                Cbuf_Execute();
        }

        if (!sv.active && !cls.demoplayback && !cls.connect_trying)
        {
                Cbuf_AddText("togglemenu\n");
                Cbuf_Execute();
        }

        Con_DPrint("========Initialized=========\n");

        //Host_StartVideo();
}


/*
===============
Host_Shutdown

FIXME: this is a callback from Sys_Quit and Sys_Error.  It would be better
to run quit through here before the final handoff to the sys code.
===============
*/
void Host_Shutdown(void)
{
        static qboolean isdown = false;

        if (isdown)
        {
                Con_Print("recursive shutdown\n");
                return;
        }
        if (setjmp(host_abortframe))
        {
                Con_Print("aborted the quitting frame?!?\n");
                return;
        }
        isdown = true;

        // be quiet while shutting down
        S_StopAllSounds();

        // disconnect client from server if active
        CL_Disconnect();

        // shut down local server if active
        Host_ShutdownServer ();

        // Shutdown menu
        if(MR_Shutdown)
                MR_Shutdown();

        // AK shutdown PRVM
        // AK hmm, no PRVM_Shutdown(); yet

        CL_Video_Shutdown();

        Host_SaveConfig();

        CDAudio_Shutdown ();
        S_Terminate ();
        Curl_Shutdown ();
        NetConn_Shutdown ();
        //PR_Shutdown ();

        if (cls.state != ca_dedicated)
        {
                R_Modules_Shutdown();
                VID_Shutdown();
        }

        Thread_Shutdown();
        Cmd_Shutdown();
        Key_Shutdown();
        CL_Shutdown();
        Sys_Shutdown();
        Log_Close();
        Crypto_Shutdown();

        Host_UnlockSession();

        S_Shutdown();
        Con_Shutdown();
        Memory_Shutdown();
}