X-Git-Url: http://git.xonotic.org/?p=xonotic%2Fdarkplaces.git;a=blobdiff_plain;f=sys_shared.c;h=3c6b0356698b63bb9bf8007ff6c5c9e8820739da;hp=c4c539d96f3b1f783130fc60eb7f3332713ad533;hb=4d34e0a632cbc401712f46e10bb9864438b0881f;hpb=d57be67cb00229acb8564b92c8b7c58eeed8a0cb

diff --git a/sys_shared.c b/sys_shared.c
index c4c539d9..3c6b0356 100644
--- a/sys_shared.c
+++ b/sys_shared.c
@@ -1,130 +1,715 @@
+#ifdef WIN32
+# ifndef DONT_USE_SETDLLDIRECTORY
+#  define _WIN32_WINNT 0x0502
+# endif
+#endif
 
 #include "quakedef.h"
-#include <time.h>
-#ifndef WIN32
-#include <unistd.h>
-#include <fcntl.h>
-#endif
-
-extern cvar_t	timestamps;
-extern cvar_t	timeformat;
-
-static int sys_nostdout = false;
-
-/* The translation table between the graphical font and plain ASCII  --KB */
-static char qfont_table[256] = {
-	'\0', '#',  '#',  '#',  '#',  '.',  '#',  '#',
-	'#',  9,    10,   '#',  ' ',  13,   '.',  '.',
-	'[',  ']',  '0',  '1',  '2',  '3',  '4',  '5',
-	'6',  '7',  '8',  '9',  '.',  '<',  '=',  '>',
-	' ',  '!',  '"',  '#',  '$',  '%',  '&',  '\'',
-	'(',  ')',  '*',  '+',  ',',  '-',  '.',  '/',
-	'0',  '1',  '2',  '3',  '4',  '5',  '6',  '7',
-	'8',  '9',  ':',  ';',  '<',  '=',  '>',  '?',
-	'@',  'A',  'B',  'C',  'D',  'E',  'F',  'G',
-	'H',  'I',  'J',  'K',  'L',  'M',  'N',  'O',
-	'P',  'Q',  'R',  'S',  'T',  'U',  'V',  'W',
-	'X',  'Y',  'Z',  '[',  '\\', ']',  '^',  '_',
-	'`',  'a',  'b',  'c',  'd',  'e',  'f',  'g',
-	'h',  'i',  'j',  'k',  'l',  'm',  'n',  'o',
-	'p',  'q',  'r',  's',  't',  'u',  'v',  'w',
-	'x',  'y',  'z',  '{',  '|',  '}',  '~',  '<',
-
-	'<',  '=',  '>',  '#',  '#',  '.',  '#',  '#',
-	'#',  '#',  ' ',  '#',  ' ',  '>',  '.',  '.',
-	'[',  ']',  '0',  '1',  '2',  '3',  '4',  '5',
-	'6',  '7',  '8',  '9',  '.',  '<',  '=',  '>',
-	' ',  '!',  '"',  '#',  '$',  '%',  '&',  '\'',
-	'(',  ')',  '*',  '+',  ',',  '-',  '.',  '/',
-	'0',  '1',  '2',  '3',  '4',  '5',  '6',  '7',
-	'8',  '9',  ':',  ';',  '<',  '=',  '>',  '?',
-	'@',  'A',  'B',  'C',  'D',  'E',  'F',  'G',
-	'H',  'I',  'J',  'K',  'L',  'M',  'N',  'O',
-	'P',  'Q',  'R',  'S',  'T',  'U',  'V',  'W',
-	'X',  'Y',  'Z',  '[',  '\\', ']',  '^',  '_',
-	'`',  'a',  'b',  'c',  'd',  'e',  'f',  'g',
-	'h',  'i',  'j',  'k',  'l',  'm',  'n',  'o', 
-	'p',  'q',  'r',  's',  't',  'u',  'v',  'w',
-	'x',  'y',  'z',  '{',  '|',  '}',  '~',  '<'
-};
+#include "taskqueue.h"
+#include "thread.h"
+
+#define SUPPORTDLL
+
+#ifdef WIN32
+# include <windows.h>
+# include <mmsystem.h> // timeGetTime
+# include <time.h> // localtime
+#ifdef _MSC_VER
+#pragma comment(lib, "winmm.lib")
+#endif
+#else
+# ifdef __FreeBSD__
+#  include <sys/sysctl.h>
+# endif
+# include <unistd.h>
+# include <fcntl.h>
+# include <sys/time.h>
+# include <time.h>
+# ifdef SUPPORTDLL
+#  include <dlfcn.h>
+# endif
+#endif
+
+static char sys_timestring[128];
+char *Sys_TimeString(const char *timeformat)
+{
+	time_t mytime = time(NULL);
+#if _MSC_VER >= 1400
+	struct tm mytm;
+	localtime_s(&mytm, &mytime);
+	strftime(sys_timestring, sizeof(sys_timestring), timeformat, &mytm);
+#else
+	strftime(sys_timestring, sizeof(sys_timestring), timeformat, localtime(&mytime));
+#endif
+	return sys_timestring;
+}
+
+
+void Sys_Quit (int returnvalue)
+{
+	// Unlock mutexes because the quit command may jump directly here, causing a deadlock
+	if ((cmd_local)->cbuf->lock)
+		Cbuf_Unlock((cmd_local)->cbuf);
+	SV_UnlockThreadMutex();
+	TaskQueue_Frame(true);
+
+	if (Sys_CheckParm("-profilegameonly"))
+		Sys_AllowProfiling(false);
+	host.state = host_shutdown;
+	Host_Shutdown();
+	exit(returnvalue);
+}
+
+#ifdef __cplusplus
+extern "C"
+#endif
+void Sys_AllowProfiling(qbool enable)
+{
+#ifdef __ANDROID__
+#ifdef USE_PROFILER
+	extern void monstartup(const char *libname);
+	extern void moncleanup(void);
+	if (enable)
+		monstartup("libmain.so");
+	else
+		moncleanup();
+#endif
+#elif (defined(__linux__) && (defined(__GLIBC__) || defined(__GNU_LIBRARY__))) || defined(__FreeBSD__)
+	extern int moncontrol(int);
+	moncontrol(enable);
+#endif
+}
+
+
+/*
+===============================================================================
 
+DLL MANAGEMENT
+
+===============================================================================
+*/
+
+static qbool Sys_LoadDependencyFunctions(dllhandle_t dllhandle, const dllfunction_t *fcts, qbool complain, qbool has_next)
+{
+	const dllfunction_t *func;
+	if(dllhandle)
+	{
+		for (func = fcts; func && func->name != NULL; func++)
+			if (!(*func->funcvariable = (void *) Sys_GetProcAddress (dllhandle, func->name)))
+			{
+				if(complain)
+				{
+					Con_DPrintf (" - missing function \"%s\" - broken library!", func->name);
+					if(has_next)
+						Con_DPrintf("\nContinuing with");
+				}
+				goto notfound;
+			}
+		return true;
+
+	notfound:
+		for (func = fcts; func && func->name != NULL; func++)
+			*func->funcvariable = NULL;
+	}
+	return false;
+}
+
+qbool Sys_LoadSelf(dllhandle_t *handle)
+{
+	dllhandle_t dllhandle = 0;
+
+	if (handle == NULL)
+		return false;
 #ifdef WIN32
-extern HANDLE hinput, houtput;
+	dllhandle = LoadLibrary (NULL);
+#else
+	dllhandle = dlopen (NULL, RTLD_NOW | RTLD_GLOBAL);
 #endif
+	*handle = dllhandle;
+	return true;
+}
 
-#define MAX_PRINT_MSG	16384
-void Sys_Printf (char *fmt, ...)
+qbool Sys_LoadDependency (const char** dllnames, dllhandle_t* handle, const dllfunction_t *fcts)
 {
-	va_list		argptr;
-	char		start[MAX_PRINT_MSG];	// String we started with
-	char		stamp[MAX_PRINT_MSG];	// Time stamp
-	char		final[MAX_PRINT_MSG];	// String we print
+#ifdef SUPPORTDLL
+	const dllfunction_t *func;
+	dllhandle_t dllhandle = 0;
+	unsigned int i;
+
+	if (handle == NULL)
+		return false;
+
+#ifndef WIN32
+#ifdef PREFER_PRELOAD
+	dllhandle = dlopen(NULL, RTLD_LAZY | RTLD_GLOBAL);
+	if(Sys_LoadDependencyFunctions(dllhandle, fcts, false, false))
+	{
+		Con_DPrintf ("All of %s's functions were already linked in! Not loading dynamically...\n", dllnames[0]);
+		*handle = dllhandle;
+		return true;
+	}
+	else
+		Sys_FreeLibrary(&dllhandle);
+notfound:
+#endif
+#endif
 
-	time_t		mytime = 0;
-	struct tm	*local = NULL;
+	// Initializations
+	for (func = fcts; func && func->name != NULL; func++)
+		*func->funcvariable = NULL;
 
-	unsigned char		*p;
+	// Try every possible name
+	Con_DPrintf ("Trying to load library...");
+	for (i = 0; dllnames[i] != NULL; i++)
+	{
+		Con_DPrintf (" \"%s\"", dllnames[i]);
 #ifdef WIN32
-	DWORD		dummy;
+# ifndef DONT_USE_SETDLLDIRECTORY
+#  ifdef _WIN64
+		SetDllDirectory("bin64");
+#  else
+		SetDllDirectory("bin32");
+#  endif
+# endif
 #endif
+		if(Sys_LoadLibrary(dllnames[i], &dllhandle))
+		{
+			if (Sys_LoadDependencyFunctions(dllhandle, fcts, true, (dllnames[i+1] != NULL) || (strrchr(sys.argv[0], '/'))))
+				break;
+			else
+				Sys_FreeLibrary (&dllhandle);
+		}
+	}
+
+	// see if the names can be loaded relative to the executable path
+	// (this is for Mac OSX which does not check next to the executable)
+	if (!dllhandle && strrchr(sys.argv[0], '/'))
+	{
+		char path[MAX_OSPATH];
+		strlcpy(path, sys.argv[0], sizeof(path));
+		strrchr(path, '/')[1] = 0;
+		for (i = 0; dllnames[i] != NULL; i++)
+		{
+			char temp[MAX_OSPATH];
+			strlcpy(temp, path, sizeof(temp));
+			strlcat(temp, dllnames[i], sizeof(temp));
+			Con_DPrintf (" \"%s\"", temp);
 
-	va_start (argptr, fmt);
-#ifdef HAVE_VSNPRINTF
-	vsnprintf (start, sizeof(start), fmt, argptr);
+			if(Sys_LoadLibrary(temp, &dllhandle))
+			{
+				if (Sys_LoadDependencyFunctions(dllhandle, fcts, true, (dllnames[i+1] != NULL) || (strrchr(sys.argv[0], '/'))))
+					break;
+				else
+					Sys_FreeLibrary (&dllhandle);
+			}
+		}
+	}
+
+	// No DLL found
+	if (! dllhandle)
+	{
+		Con_DPrintf(" - failed.\n");
+		return false;
+	}
+
+	Con_DPrintf(" - loaded.\n");
+	Con_Printf("Loaded library \"%s\"\n", dllnames[i]);
+
+	*handle = dllhandle;
+	return true;
 #else
-	vsprintf (start, fmt, argptr);
+	return false;
+#endif
+}
+
+qbool Sys_LoadLibrary(const char *name, dllhandle_t *handle)
+{
+	dllhandle_t dllhandle = 0;
+
+	if(handle == NULL)
+		return false;
+
+#ifdef SUPPORTDLL
+# ifdef WIN32
+	dllhandle = LoadLibrary (name);
+# else
+	dllhandle = dlopen (name, RTLD_LAZY | RTLD_GLOBAL);
+# endif
 #endif
-	va_end (argptr);
+	if(!dllhandle)
+		return false;
+
+	*handle = dllhandle;
+	return true;
+}
 
-	if (sys_nostdout)
+void Sys_FreeLibrary (dllhandle_t* handle)
+{
+#ifdef SUPPORTDLL
+	if (handle == NULL || *handle == NULL)
 		return;
 
-	if (timestamps.integer)
+#ifdef WIN32
+	FreeLibrary (*handle);
+#else
+	dlclose (*handle);
+#endif
+
+	*handle = NULL;
+#endif
+}
+
+void* Sys_GetProcAddress (dllhandle_t handle, const char* name)
+{
+#ifdef SUPPORTDLL
+#ifdef WIN32
+	return (void *)GetProcAddress (handle, name);
+#else
+	return (void *)dlsym (handle, name);
+#endif
+#else
+	return NULL;
+#endif
+}
+
+#ifdef WIN32
+# define HAVE_TIMEGETTIME 1
+# define HAVE_QUERYPERFORMANCECOUNTER 1
+# define HAVE_Sleep 1
+#endif
+
+#ifndef WIN32
+#if defined(CLOCK_MONOTONIC) || defined(CLOCK_HIRES)
+# define HAVE_CLOCKGETTIME 1
+#endif
+// FIXME improve this check, manpage hints to DST_NONE
+# define HAVE_GETTIMEOFDAY 1
+#endif
+
+#ifndef WIN32
+// on Win32, select() cannot be used with all three FD list args being NULL according to MSDN
+// (so much for POSIX...)
+# ifdef FD_SET
+#  define HAVE_SELECT 1
+# endif
+#endif
+
+#ifndef WIN32
+// FIXME improve this check
+# define HAVE_USLEEP 1
+#endif
+
+// these are referenced elsewhere
+cvar_t sys_usenoclockbutbenchmark = {CF_CLIENT | CF_SERVER | CF_ARCHIVE, "sys_usenoclockbutbenchmark", "0", "don't use ANY real timing, and simulate a clock (for benchmarking); the game then runs as fast as possible. Run a QC mod with bots that does some stuff, then does a quit at the end, to benchmark a server. NEVER do this on a public server."};
+cvar_t sys_libdir = {CF_READONLY | CF_CLIENT | CF_SERVER, "sys_libdir", "", "Default engine library directory"};
+
+// these are not
+static cvar_t sys_debugsleep = {CF_CLIENT | CF_SERVER, "sys_debugsleep", "0", "write requested and attained sleep times to standard output, to be used with gnuplot"};
+static cvar_t sys_usesdlgetticks = {CF_CLIENT | CF_SERVER | CF_ARCHIVE, "sys_usesdlgetticks", "0", "use SDL_GetTicks() timer (less accurate, for debugging)"};
+static cvar_t sys_usesdldelay = {CF_CLIENT | CF_SERVER | CF_ARCHIVE, "sys_usesdldelay", "0", "use SDL_Delay() (less accurate, for debugging)"};
+#if HAVE_QUERYPERFORMANCECOUNTER
+static cvar_t sys_usequeryperformancecounter = {CF_CLIENT | CF_SERVER | CF_ARCHIVE, "sys_usequeryperformancecounter", "0", "use windows QueryPerformanceCounter timer (which has issues on multicore/multiprocessor machines and processors which are designed to conserve power) for timing rather than timeGetTime function (which has issues on some motherboards)"};
+#endif
+#if HAVE_CLOCKGETTIME
+static cvar_t sys_useclockgettime = {CF_CLIENT | CF_SERVER | CF_ARCHIVE, "sys_useclockgettime", "1", "use POSIX clock_gettime function (not adjusted by NTP on some older Linux kernels) for timing rather than gettimeofday (which has issues if the system time is stepped by ntpdate, or apparently on some Xen installations)"};
+#endif
+
+static double benchmark_time; // actually always contains an integer amount of milliseconds, will eventually "overflow"
+
+/*
+================
+Sys_CheckParm
+
+Returns the position (1 to argc-1) in the program's argument list
+where the given parameter apears, or 0 if not present
+================
+*/
+int Sys_CheckParm (const char *parm)
+{
+	int i;
+
+	for (i=1 ; i<sys.argc ; i++)
+	{
+		if (!sys.argv[i])
+			continue;               // NEXTSTEP sometimes clears appkit vars.
+		if (!strcmp (parm,sys.argv[i]))
+			return i;
+	}
+
+	return 0;
+}
+
+void Sys_Init_Commands (void)
+{
+	Cvar_RegisterVariable(&sys_debugsleep);
+	Cvar_RegisterVariable(&sys_usenoclockbutbenchmark);
+	Cvar_RegisterVariable(&sys_libdir);
+#if HAVE_TIMEGETTIME || HAVE_QUERYPERFORMANCECOUNTER || HAVE_CLOCKGETTIME || HAVE_GETTIMEOFDAY
+	if(sys_supportsdlgetticks)
+	{
+		Cvar_RegisterVariable(&sys_usesdlgetticks);
+		Cvar_RegisterVariable(&sys_usesdldelay);
+	}
+#endif
+#if HAVE_QUERYPERFORMANCECOUNTER
+	Cvar_RegisterVariable(&sys_usequeryperformancecounter);
+#endif
+#if HAVE_CLOCKGETTIME
+	Cvar_RegisterVariable(&sys_useclockgettime);
+#endif
+}
+
+double Sys_DirtyTime(void)
+{
+	// first all the OPTIONAL timers
+
+	// benchmark timer (fake clock)
+	if(sys_usenoclockbutbenchmark.integer)
+	{
+		double old_benchmark_time = benchmark_time;
+		benchmark_time += 1;
+		if(benchmark_time == old_benchmark_time)
+			Sys_Error("sys_usenoclockbutbenchmark cannot run any longer, sorry");
+		return benchmark_time * 0.000001;
+	}
+#if HAVE_QUERYPERFORMANCECOUNTER
+	if (sys_usequeryperformancecounter.integer)
+	{
+		// LadyHavoc: note to people modifying this code, DWORD is specifically defined as an unsigned 32bit number, therefore the 65536.0 * 65536.0 is fine.
+		// QueryPerformanceCounter
+		// platform:
+		// Windows 95/98/ME/NT/2000/XP
+		// features:
+		// very accurate (CPU cycles)
+		// known issues:
+		// does not necessarily match realtime too well (tends to get faster and faster in win98)
+		// wraps around occasionally on some platforms (depends on CPU speed and probably other unknown factors)
+		double timescale;
+		LARGE_INTEGER PerformanceFreq;
+		LARGE_INTEGER PerformanceCount;
+
+		if (QueryPerformanceFrequency (&PerformanceFreq))
+		{
+			QueryPerformanceCounter (&PerformanceCount);
+	
+			timescale = 1.0 / ((double) PerformanceFreq.LowPart + (double) PerformanceFreq.HighPart * 65536.0 * 65536.0);
+			return ((double) PerformanceCount.LowPart + (double) PerformanceCount.HighPart * 65536.0 * 65536.0) * timescale;
+		}
+		else
+		{
+			Con_Printf("No hardware timer available\n");
+			// fall back to other clock sources
+			Cvar_SetValueQuick(&sys_usequeryperformancecounter, false);
+		}
+	}
+#endif
+
+#if HAVE_CLOCKGETTIME
+	if (sys_useclockgettime.integer)
 	{
-		mytime = time (NULL);
-		local = localtime (&mytime);
-		strftime (stamp, sizeof (stamp), timeformat.string, local);
+		struct timespec ts;
+#  ifdef CLOCK_MONOTONIC
+		// linux
+		clock_gettime(CLOCK_MONOTONIC, &ts);
+#  else
+		// sunos
+		clock_gettime(CLOCK_HIGHRES, &ts);
+#  endif
+		return (double) ts.tv_sec + ts.tv_nsec / 1000000000.0;
+	}
+#endif
+
+	// now all the FALLBACK timers
+	if(sys_supportsdlgetticks && sys_usesdlgetticks.integer)
+		return (double) Sys_SDL_GetTicks() / 1000.0;
+#if HAVE_GETTIMEOFDAY
+	{
+		struct timeval tp;
+		gettimeofday(&tp, NULL);
+		return (double) tp.tv_sec + tp.tv_usec / 1000000.0;
+	}
+#elif HAVE_TIMEGETTIME
+	{
+		static int firsttimegettime = true;
+		// timeGetTime
+		// platform:
+		// Windows 95/98/ME/NT/2000/XP
+		// features:
+		// reasonable accuracy (millisecond)
+		// issues:
+		// wraps around every 47 days or so (but this is non-fatal to us, odd times are rejected, only causes a one frame stutter)
+
+		// make sure the timer is high precision, otherwise different versions of windows have varying accuracy
+		if (firsttimegettime)
+		{
+			timeBeginPeriod(1);
+			firsttimegettime = false;
+		}
 
-		snprintf (final, sizeof (final), "%s%s", stamp, start);
+		return (double) timeGetTime() / 1000.0;
+	}
+#else
+	// fallback for using the SDL timer if no other timer is available
+	// this calls Sys_Error() if not linking against SDL
+	return (double) Sys_SDL_GetTicks() / 1000.0;
+#endif
+}
+
+void Sys_Sleep(int microseconds)
+{
+	double t = 0;
+	if(sys_usenoclockbutbenchmark.integer)
+	{
+		if(microseconds)
+		{
+			double old_benchmark_time = benchmark_time;
+			benchmark_time += microseconds;
+			if(benchmark_time == old_benchmark_time)
+				Sys_Error("sys_usenoclockbutbenchmark cannot run any longer, sorry");
+		}
+		return;
+	}
+	if(sys_debugsleep.integer)
+	{
+		t = Sys_DirtyTime();
+	}
+	if(sys_supportsdlgetticks && sys_usesdldelay.integer)
+	{
+		Sys_SDL_Delay(microseconds / 1000);
+	}
+#if HAVE_SELECT
+	else
+	{
+		struct timeval tv;
+		tv.tv_sec = microseconds / 1000000;
+		tv.tv_usec = microseconds % 1000000;
+		select(0, NULL, NULL, NULL, &tv);
+	}
+#elif HAVE_USLEEP
+	else
+	{
+		usleep(microseconds);
+	}
+#elif HAVE_Sleep
+	else
+	{
+		Sleep(microseconds / 1000);
 	}
+#else
 	else
-		snprintf (final, sizeof (final), "%s", start);
+	{
+		Sys_SDL_Delay(microseconds / 1000);
+	}
+#endif
+	if(sys_debugsleep.integer)
+	{
+		t = Sys_DirtyTime() - t;
+		Sys_PrintfToTerminal("%d %d # debugsleep\n", microseconds, (unsigned int)(t * 1000000));
+	}
+}
 
-	// LordHavoc: make sure the string is terminated
-	final[MAX_PRINT_MSG - 1] = 0;
-	for (p = (unsigned char *) final;*p; p++)
-		*p = qfont_table[*p];
-#ifdef WIN32
-	if (cls.state == ca_dedicated)
-		WriteFile(houtput, final, strlen (final), &dummy, NULL);
+void Sys_PrintfToTerminal(const char *fmt, ...)
+{
+	va_list argptr;
+	char msg[MAX_INPUTLINE];
+
+	va_start(argptr,fmt);
+	dpvsnprintf(msg,sizeof(msg),fmt,argptr);
+	va_end(argptr);
+
+	Sys_PrintToTerminal(msg);
+}
+
+#ifndef WIN32
+static const char *Sys_FindInPATH(const char *name, char namesep, const char *PATH, char pathsep, char *buf, size_t bufsize)
+{
+	const char *p = PATH;
+	const char *q;
+	if(p && name)
+	{
+		while((q = strchr(p, ':')))
+		{
+			dpsnprintf(buf, bufsize, "%.*s%c%s", (int)(q-p), p, namesep, name);
+			if(FS_SysFileExists(buf))
+				return buf;
+			p = q + 1;
+		}
+		if(!q) // none found - try the last item
+		{
+			dpsnprintf(buf, bufsize, "%s%c%s", p, namesep, name);
+			if(FS_SysFileExists(buf))
+				return buf;
+		}
+	}
+	return name;
+}
+#endif
+
+static const char *Sys_FindExecutableName(void)
+{
+#if defined(WIN32)
+	return sys.argv[0];
 #else
-	printf("%s", final);
+	static char exenamebuf[MAX_OSPATH+1];
+	ssize_t n = -1;
+#if defined(__FreeBSD__)
+	int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1};
+	size_t exenamebuflen = sizeof(exenamebuf)-1;
+	if (sysctl(mib, 4, exenamebuf, &exenamebuflen, NULL, 0) == 0)
+	{
+		n = exenamebuflen;
+	}
+#elif defined(__linux__)
+	n = readlink("/proc/self/exe", exenamebuf, sizeof(exenamebuf)-1);
 #endif
-//	for (p = (unsigned char *) final; *p; p++)
-//		putc (qfont_table[*p], stdout);
-//#ifndef WIN32
-//	fflush (stdout);
-//#endif
+	if(n > 0 && (size_t)(n) < sizeof(exenamebuf))
+	{
+		exenamebuf[n] = 0;
+		return exenamebuf;
+	}
+	if(strchr(sys.argv[0], '/'))
+		return sys.argv[0]; // possibly a relative path
+	else
+		return Sys_FindInPATH(sys.argv[0], '/', getenv("PATH"), ':', exenamebuf, sizeof(exenamebuf));
+#endif
+}
+
+void Sys_ProvideSelfFD(void)
+{
+	if(sys.selffd != -1)
+		return;
+	sys.selffd = FS_SysOpenFD(Sys_FindExecutableName(), "rb", false);
 }
 
-char engineversion[40];
+// for x86 cpus only...  (x64 has SSE2_PRESENT)
+#if defined(SSE_POSSIBLE) && !defined(SSE2_PRESENT)
+// code from SDL, shortened as we can expect CPUID to work
+static int CPUID_Features(void)
+{
+	int features = 0;
+# if (defined(__GNUC__) || defined(__clang__) || defined(__TINYC__)) && defined(__i386__)
+        __asm__ (
+"        movl    %%ebx,%%edi\n"
+"        xorl    %%eax,%%eax                                           \n"
+"        incl    %%eax                                                 \n"
+"        cpuid                       # Get family/model/stepping/features\n"
+"        movl    %%edx,%0                                              \n"
+"        movl    %%edi,%%ebx\n"
+        : "=m" (features)
+        :
+        : "%eax", "%ecx", "%edx", "%edi"
+        );
+# elif (defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)
+        __asm {
+        xor     eax, eax
+        inc     eax
+        cpuid                       ; Get family/model/stepping/features
+        mov     features, edx
+        }
+# else
+#  error SSE_POSSIBLE set but no CPUID implementation
+# endif
+	return features;
+}
+#endif
 
-void Sys_Shared_EarlyInit(void)
+#ifdef SSE_POSSIBLE
+qbool Sys_HaveSSE(void)
 {
-#if defined(__linux__)
-	sprintf (engineversion, "%s Linux GL build %3i", gamename, buildnumber);
-#elif defined(WIN32)
-	sprintf (engineversion, "%s Windows GL build %3i", gamename, buildnumber);
+	// COMMANDLINEOPTION: SSE: -nosse disables SSE support and detection
+	if(Sys_CheckParm("-nosse"))
+		return false;
+#ifdef SSE_PRESENT
+	return true;
 #else
-	sprintf (engineversion, "%s Unknown GL build %3i", gamename, buildnumber);
+	// COMMANDLINEOPTION: SSE: -forcesse enables SSE support and disables detection
+	if(Sys_CheckParm("-forcesse") || Sys_CheckParm("-forcesse2"))
+		return true;
+	if(CPUID_Features() & (1 << 25))
+		return true;
+	return false;
 #endif
+}
 
-	if (COM_CheckParm("-nostdout"))
-		sys_nostdout = 1;
-	else
-		printf("%s\n", engineversion);
+qbool Sys_HaveSSE2(void)
+{
+	// COMMANDLINEOPTION: SSE2: -nosse2 disables SSE2 support and detection
+	if(Sys_CheckParm("-nosse") || Sys_CheckParm("-nosse2"))
+		return false;
+#ifdef SSE2_PRESENT
+	return true;
+#else
+	// COMMANDLINEOPTION: SSE2: -forcesse2 enables SSE2 support and disables detection
+	if(Sys_CheckParm("-forcesse2"))
+		return true;
+	if((CPUID_Features() & (3 << 25)) == (3 << 25)) // SSE is 1<<25, SSE2 is 1<<26
+		return true;
+	return false;
+#endif
 }
+#endif
 
-void Sys_Shared_LateInit(void)
+/// called to set process priority for dedicated servers
+#if defined(__linux__)
+#include <sys/resource.h>
+#include <errno.h>
+
+void Sys_InitProcessNice (void)
 {
+	struct rlimit lim;
+	sys.nicepossible = false;
+	if(Sys_CheckParm("-nonice"))
+		return;
+	errno = 0;
+	sys.nicelevel = getpriority(PRIO_PROCESS, 0);
+	if(errno)
+	{
+		Con_Printf("Kernel does not support reading process priority - cannot use niceness\n");
+		return;
+	}
+	if(getrlimit(RLIMIT_NICE, &lim))
+	{
+		Con_Printf("Kernel does not support lowering nice level again - cannot use niceness\n");
+		return;
+	}
+	if(lim.rlim_cur != RLIM_INFINITY && sys.nicelevel < (int) (20 - lim.rlim_cur))
+	{
+		Con_Printf("Current nice level is below the soft limit - cannot use niceness\n");
+		return;
+	}
+	sys.nicepossible = true;
+	sys.isnice = false;
 }
+void Sys_MakeProcessNice (void)
+{
+	if(!sys.nicepossible)
+		return;
+	if(sys.isnice)
+		return;
+	Con_DPrintf("Process is becoming 'nice'...\n");
+	if(setpriority(PRIO_PROCESS, 0, 19))
+		Con_Printf(CON_ERROR "Failed to raise nice level to %d\n", 19);
+	sys.isnice = true;
+}
+void Sys_MakeProcessMean (void)
+{
+	if(!sys.nicepossible)
+		return;
+	if(!sys.isnice)
+		return;
+	Con_DPrintf("Process is becoming 'mean'...\n");
+	if(setpriority(PRIO_PROCESS, 0, sys.nicelevel))
+		Con_Printf(CON_ERROR "Failed to lower nice level to %d\n", sys.nicelevel);
+	sys.isnice = false;
+}
+#else
+void Sys_InitProcessNice (void)
+{
+}
+void Sys_MakeProcessNice (void)
+{
+}
+void Sys_MakeProcessMean (void)
+{
+}
+#endif