File: sys.h

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/*
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.

*/
// sys.h -- non-portable functions

#ifndef SYS_H
#define SYS_H

extern cvar_t sys_usenoclockbutbenchmark;

//
// DLL management
//

// Win32 specific
#ifdef WIN32
# include <windows.h>
typedef HMODULE dllhandle_t;

// Other platforms
#else
  typedef void* dllhandle_t;
#endif

typedef struct dllfunction_s
{
	const char *name;
	void **funcvariable;
}
dllfunction_t;

/*! Loads a library. 
 * \param dllnames a NULL terminated array of possible names for the DLL you want to load.
 * \param handle
 * \param fcts
 */
qboolean Sys_LoadLibrary (const char** dllnames, dllhandle_t* handle, const dllfunction_t *fcts) __attribute__ ((__warning__ ("in Debian, please link shared libraries at build time")));
void Sys_UnloadLibrary (dllhandle_t* handle);
void* Sys_GetProcAddress (dllhandle_t handle, const char* name);

/// called early in Host_Init
void Sys_InitConsole (void);
/// called after command system is initialized but before first Con_Print
void Sys_Init_Commands (void);


/// \returns current timestamp
char *Sys_TimeString(const char *timeformat);

//
// system IO interface (these are the sys functions that need to be implemented in a new driver atm)
//

/// an error will cause the entire program to exit
void Sys_Error (const char *error, ...) DP_FUNC_PRINTF(1) DP_FUNC_NORETURN;

/// (may) output text to terminal which launched program
void Sys_PrintToTerminal(const char *text);
void Sys_PrintfToTerminal(const char *fmt, ...);

/// INFO: This is only called by Host_Shutdown so we don't need testing for recursion
void Sys_Shutdown (void);
void Sys_Quit (int returnvalue);

/*! on some build/platform combinations (such as Linux gcc with the -pg
 * profiling option) this can turn on/off profiling, used primarily to limit
 * profiling to certain areas of the code, such as ingame performance without
 * regard for loading/shutdown performance (-profilegameonly on commandline)
 */
#ifdef __cplusplus
extern "C"
#endif
void Sys_AllowProfiling (qboolean enable);

typedef struct sys_cleantime_s
{
	double dirtytime; // last value gotten from Sys_DirtyTime()
	double cleantime; // sanitized linearly increasing time since app start
}
sys_cleantime_t;

double Sys_DirtyTime(void);

void Sys_ProvideSelfFD (void);

char *Sys_ConsoleInput (void);

/// called to yield for a little bit so as not to hog cpu when paused or debugging
void Sys_Sleep(int microseconds);

/// Perform Key_Event () callbacks until the input que is empty
void Sys_SendKeyEvents (void);

char *Sys_GetClipboardData (void);

extern qboolean sys_supportsdlgetticks;
unsigned int Sys_SDL_GetTicks (void); // wrapper to call SDL_GetTicks
void Sys_SDL_Delay (unsigned int milliseconds); // wrapper to call SDL_Delay

/// called to set process priority for dedicated servers
void Sys_InitProcessNice (void);
void Sys_MakeProcessNice (void);
void Sys_MakeProcessMean (void);

#endif