sys_shared.c

   1 #ifdef WIN32
   2 # ifndef DONT_USE_SETDLLDIRECTORY
   3 #  define _WIN32_WINNT 0x0502
   4 # endif
   5 #endif
   6
   7 #define SUPPORTDLL
   8
   9 #ifdef WIN32
  10 # include <windows.h>
  11 # include <mmsystem.h> // timeGetTime
  12 # include <time.h> // localtime
  13 # include <conio.h> // _kbhit, _getch, _putch
  14 # include <io.h> // write; Include this BEFORE darkplaces.h because it uses strncpy which trips DP_STATIC_ASSERT
  15 #ifdef _MSC_VER
  16 #pragma comment(lib, "winmm.lib")
  17 #endif
  18 #else
  19 # ifdef __FreeBSD__
  20 #  include <sys/sysctl.h>
  21 # endif
  22 # ifdef __ANDROID__
  23 #  include <android/log.h>
  24 # endif
  25 # include <unistd.h>
  26 # include <fcntl.h>
  27 # include <sys/time.h>
  28 # include <time.h>
  29 # ifdef SUPPORTDLL
  30 #  include <dlfcn.h>
  31 # endif
  32 #endif
  33
  34 #include <signal.h>
  35
  36 #include "quakedef.h"
  37 #include "taskqueue.h"
  38 #include "thread.h"
  39 #include "libcurl.h"
  40
  41 static char sys_timestring[128];
  42 char *Sys_TimeString(const char *timeformat)
  43 {
  44         time_t mytime = time(NULL);
  45 #if _MSC_VER >= 1400
  46         struct tm mytm;
  47         localtime_s(&mytm, &mytime);
  48         strftime(sys_timestring, sizeof(sys_timestring), timeformat, &mytm);
  49 #else
  50         strftime(sys_timestring, sizeof(sys_timestring), timeformat, localtime(&mytime));
  51 #endif
  52         return sys_timestring;
  53 }
  54
  55
  56 void Sys_Quit (int returnvalue)
  57 {
  58         // Unlock mutexes because the quit command may jump directly here, causing a deadlock
  59         if ((cmd_local)->cbuf->lock)
  60                 Cbuf_Unlock((cmd_local)->cbuf);
  61         SV_UnlockThreadMutex();
  62         TaskQueue_Frame(true);
  63
  64         if (Sys_CheckParm("-profilegameonly"))
  65                 Sys_AllowProfiling(false);
  66         host.state = host_shutdown;
  67         Host_Shutdown();
  68         exit(returnvalue);
  69 }
  70
  71 #ifdef __cplusplus
  72 extern "C"
  73 #endif
  74 void Sys_AllowProfiling(qbool enable)
  75 {
  76 #ifdef __ANDROID__
  77 #ifdef USE_PROFILER
  78         extern void monstartup(const char *libname);
  79         extern void moncleanup(void);
  80         if (enable)
  81                 monstartup("libmain.so");
  82         else
  83                 moncleanup();
  84 #endif
  85 #elif (defined(__linux__) && (defined(__GLIBC__) || defined(__GNU_LIBRARY__))) || defined(__FreeBSD__)
  86         extern int moncontrol(int);
  87         moncontrol(enable);
  88 #endif
  89 }
  90
  91
  92 /*
  93 ===============================================================================
  94
  95 DLL MANAGEMENT
  96
  97 ===============================================================================
  98 */
  99
 100 static qbool Sys_LoadDependencyFunctions(dllhandle_t dllhandle, const dllfunction_t *fcts, qbool complain, qbool has_next)
 101 {
 102         const dllfunction_t *func;
 103         if(dllhandle)
 104         {
 105                 for (func = fcts; func && func->name != NULL; func++)
 106                         if (!(*func->funcvariable = (void *) Sys_GetProcAddress (dllhandle, func->name)))
 107                         {
 108                                 if(complain)
 109                                 {
 110                                         Con_DPrintf (" - missing function \"%s\" - broken library!", func->name);
 111                                         if(has_next)
 112                                                 Con_DPrintf("\nContinuing with");
 113                                 }
 114                                 goto notfound;
 115                         }
 116                 return true;
 117
 118         notfound:
 119                 for (func = fcts; func && func->name != NULL; func++)
 120                         *func->funcvariable = NULL;
 121         }
 122         return false;
 123 }
 124
 125 qbool Sys_LoadSelf(dllhandle_t *handle)
 126 {
 127         dllhandle_t dllhandle = 0;
 128
 129         if (handle == NULL)
 130                 return false;
 131 #ifdef WIN32
 132         dllhandle = LoadLibrary (NULL);
 133 #else
 134         dllhandle = dlopen (NULL, RTLD_NOW | RTLD_GLOBAL);
 135 #endif
 136         *handle = dllhandle;
 137         return true;
 138 }
 139
 140 qbool Sys_LoadDependency (const char** dllnames, dllhandle_t* handle, const dllfunction_t *fcts)
 141 {
 142 #ifdef SUPPORTDLL
 143         const dllfunction_t *func;
 144         dllhandle_t dllhandle = 0;
 145         unsigned int i;
 146
 147         if (handle == NULL)
 148                 return false;
 149
 150 #ifndef WIN32
 151 #ifdef PREFER_PRELOAD
 152         dllhandle = dlopen(NULL, RTLD_LAZY | RTLD_GLOBAL);
 153         if(Sys_LoadDependencyFunctions(dllhandle, fcts, false, false))
 154         {
 155                 Con_DPrintf ("All of %s's functions were already linked in! Not loading dynamically...\n", dllnames[0]);
 156                 *handle = dllhandle;
 157                 return true;
 158         }
 159         else
 160                 Sys_FreeLibrary(&dllhandle);
 161 notfound:
 162 #endif
 163 #endif
 164
 165         // Initializations
 166         for (func = fcts; func && func->name != NULL; func++)
 167                 *func->funcvariable = NULL;
 168
 169         // Try every possible name
 170         Con_DPrintf ("Trying to load library...");
 171         for (i = 0; dllnames[i] != NULL; i++)
 172         {
 173                 Con_DPrintf (" \"%s\"", dllnames[i]);
 174 #ifdef WIN32
 175 # ifndef DONT_USE_SETDLLDIRECTORY
 176 #  ifdef _WIN64
 177                 SetDllDirectory("bin64");
 178 #  else
 179                 SetDllDirectory("bin32");
 180 #  endif
 181 # endif
 182 #endif
 183                 if(Sys_LoadLibrary(dllnames[i], &dllhandle))
 184                 {
 185                         if (Sys_LoadDependencyFunctions(dllhandle, fcts, true, (dllnames[i+1] != NULL) || (strrchr(sys.argv[0], '/'))))
 186                                 break;
 187                         else
 188                                 Sys_FreeLibrary (&dllhandle);
 189                 }
 190         }
 191
 192         // see if the names can be loaded relative to the executable path
 193         // (this is for Mac OSX which does not check next to the executable)
 194         if (!dllhandle && strrchr(sys.argv[0], '/'))
 195         {
 196                 char path[MAX_OSPATH];
 197                 strlcpy(path, sys.argv[0], sizeof(path));
 198                 strrchr(path, '/')[1] = 0;
 199                 for (i = 0; dllnames[i] != NULL; i++)
 200                 {
 201                         char temp[MAX_OSPATH];
 202                         strlcpy(temp, path, sizeof(temp));
 203                         strlcat(temp, dllnames[i], sizeof(temp));
 204                         Con_DPrintf (" \"%s\"", temp);
 205
 206                         if(Sys_LoadLibrary(temp, &dllhandle))
 207                         {
 208                                 if (Sys_LoadDependencyFunctions(dllhandle, fcts, true, (dllnames[i+1] != NULL) || (strrchr(sys.argv[0], '/'))))
 209                                         break;
 210                                 else
 211                                         Sys_FreeLibrary (&dllhandle);
 212                         }
 213                 }
 214         }
 215
 216         // No DLL found
 217         if (! dllhandle)
 218         {
 219                 Con_DPrintf(" - failed.\n");
 220                 return false;
 221         }
 222
 223         Con_DPrintf(" - loaded.\n");
 224         Con_Printf("Loaded library \"%s\"\n", dllnames[i]);
 225
 226         *handle = dllhandle;
 227         return true;
 228 #else
 229         return false;
 230 #endif
 231 }
 232
 233 qbool Sys_LoadLibrary(const char *name, dllhandle_t *handle)
 234 {
 235         dllhandle_t dllhandle = 0;
 236
 237         if(handle == NULL)
 238                 return false;
 239
 240 #ifdef SUPPORTDLL
 241 # ifdef WIN32
 242         dllhandle = LoadLibrary (name);
 243 # else
 244         dllhandle = dlopen (name, RTLD_LAZY | RTLD_GLOBAL);
 245 # endif
 246 #endif
 247         if(!dllhandle)
 248                 return false;
 249
 250         *handle = dllhandle;
 251         return true;
 252 }
 253
 254 void Sys_FreeLibrary (dllhandle_t* handle)
 255 {
 256 #ifdef SUPPORTDLL
 257         if (handle == NULL || *handle == NULL)
 258                 return;
 259
 260 #ifdef WIN32
 261         FreeLibrary (*handle);
 262 #else
 263         dlclose (*handle);
 264 #endif
 265
 266         *handle = NULL;
 267 #endif
 268 }
 269
 270 void* Sys_GetProcAddress (dllhandle_t handle, const char* name)
 271 {
 272 #ifdef SUPPORTDLL
 273 #ifdef WIN32
 274         return (void *)GetProcAddress (handle, name);
 275 #else
 276         return (void *)dlsym (handle, name);
 277 #endif
 278 #else
 279         return NULL;
 280 #endif
 281 }
 282
 283 #ifdef WIN32
 284 # define HAVE_TIMEGETTIME 1
 285 # define HAVE_QUERYPERFORMANCECOUNTER 1
 286 # define HAVE_Sleep 1
 287 #endif
 288
 289 #ifndef WIN32
 290 #if defined(CLOCK_MONOTONIC) || defined(CLOCK_HIRES)
 291 # define HAVE_CLOCKGETTIME 1
 292 #endif
 293 // FIXME improve this check, manpage hints to DST_NONE
 294 # define HAVE_GETTIMEOFDAY 1
 295 #endif
 296
 297 #ifdef FD_SET
 298 # define HAVE_SELECT 1
 299 #endif
 300
 301 #ifndef WIN32
 302 // FIXME improve this check
 303 # define HAVE_USLEEP 1
 304 #endif
 305
 306 // these are referenced elsewhere
 307 cvar_t sys_usenoclockbutbenchmark = {CF_SHARED, "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."};
 308 cvar_t sys_libdir = {CF_READONLY | CF_SHARED, "sys_libdir", "", "Default engine library directory"};
 309
 310 // these are not
 311 static cvar_t sys_debugsleep = {CF_SHARED, "sys_debugsleep", "0", "write requested and attained sleep times to standard output, to be used with gnuplot"};
 312 static cvar_t sys_usesdlgetticks = {CF_SHARED, "sys_usesdlgetticks", "0", "use SDL_GetTicks() timer (less accurate, for debugging)"};
 313 static cvar_t sys_usesdldelay = {CF_SHARED, "sys_usesdldelay", "0", "use SDL_Delay() (less accurate, for debugging)"};
 314 #if HAVE_QUERYPERFORMANCECOUNTER
 315 static cvar_t sys_usequeryperformancecounter = {CF_SHARED | 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)"};
 316 #endif
 317 #if HAVE_CLOCKGETTIME
 318 static cvar_t sys_useclockgettime = {CF_SHARED | 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)"};
 319 #endif
 320
 321 static double benchmark_time; // actually always contains an integer amount of milliseconds, will eventually "overflow"
 322
 323 /*
 324 ================
 325 Sys_CheckParm
 326
 327 Returns the position (1 to argc-1) in the program's argument list
 328 where the given parameter apears, or 0 if not present
 329 ================
 330 */
 331 int Sys_CheckParm (const char *parm)
 332 {
 333         int i;
 334
 335         for (i=1 ; i<sys.argc ; i++)
 336         {
 337                 if (!sys.argv[i])
 338                         continue;               // NEXTSTEP sometimes clears appkit vars.
 339                 if (!strcmp (parm,sys.argv[i]))
 340                         return i;
 341         }
 342
 343         return 0;
 344 }
 345
 346 void Sys_Init_Commands (void)
 347 {
 348         Cvar_RegisterVariable(&sys_debugsleep);
 349         Cvar_RegisterVariable(&sys_usenoclockbutbenchmark);
 350         Cvar_RegisterVariable(&sys_libdir);
 351 #if HAVE_TIMEGETTIME || HAVE_QUERYPERFORMANCECOUNTER || HAVE_CLOCKGETTIME || HAVE_GETTIMEOFDAY
 352         if(sys_supportsdlgetticks)
 353         {
 354                 Cvar_RegisterVariable(&sys_usesdlgetticks);
 355                 Cvar_RegisterVariable(&sys_usesdldelay);
 356         }
 357 #endif
 358 #if HAVE_QUERYPERFORMANCECOUNTER
 359         Cvar_RegisterVariable(&sys_usequeryperformancecounter);
 360 #endif
 361 #if HAVE_CLOCKGETTIME
 362         Cvar_RegisterVariable(&sys_useclockgettime);
 363 #endif
 364 }
 365
 366 double Sys_DirtyTime(void)
 367 {
 368         // first all the OPTIONAL timers
 369
 370         // benchmark timer (fake clock)
 371         if(sys_usenoclockbutbenchmark.integer)
 372         {
 373                 double old_benchmark_time = benchmark_time;
 374                 benchmark_time += 1;
 375                 if(benchmark_time == old_benchmark_time)
 376                         Sys_Error("sys_usenoclockbutbenchmark cannot run any longer, sorry");
 377                 return benchmark_time * 0.000001;
 378         }
 379 #if HAVE_QUERYPERFORMANCECOUNTER
 380         if (sys_usequeryperformancecounter.integer)
 381         {
 382                 // LadyHavoc: note to people modifying this code, DWORD is specifically defined as an unsigned 32bit number, therefore the 65536.0 * 65536.0 is fine.
 383                 // QueryPerformanceCounter
 384                 // platform:
 385                 // Windows 95/98/ME/NT/2000/XP
 386                 // features:
 387                 // very accurate (CPU cycles)
 388                 // known issues:
 389                 // does not necessarily match realtime too well (tends to get faster and faster in win98)
 390                 // wraps around occasionally on some platforms (depends on CPU speed and probably other unknown factors)
 391                 double timescale;
 392                 LARGE_INTEGER PerformanceFreq;
 393                 LARGE_INTEGER PerformanceCount;
 394
 395                 if (QueryPerformanceFrequency (&PerformanceFreq))
 396                 {
 397                         QueryPerformanceCounter (&PerformanceCount);
 398
 399                         timescale = 1.0 / ((double) PerformanceFreq.LowPart + (double) PerformanceFreq.HighPart * 65536.0 * 65536.0);
 400                         return ((double) PerformanceCount.LowPart + (double) PerformanceCount.HighPart * 65536.0 * 65536.0) * timescale;
 401                 }
 402                 else
 403                 {
 404                         Con_Printf("No hardware timer available\n");
 405                         // fall back to other clock sources
 406                         Cvar_SetValueQuick(&sys_usequeryperformancecounter, false);
 407                 }
 408         }
 409 #endif
 410
 411 #if HAVE_CLOCKGETTIME
 412         if (sys_useclockgettime.integer)
 413         {
 414                 struct timespec ts;
 415 #  ifdef CLOCK_MONOTONIC
 416                 // linux
 417                 clock_gettime(CLOCK_MONOTONIC, &ts);
 418 #  else
 419                 // sunos
 420                 clock_gettime(CLOCK_HIGHRES, &ts);
 421 #  endif
 422                 return (double) ts.tv_sec + ts.tv_nsec / 1000000000.0;
 423         }
 424 #endif
 425
 426         // now all the FALLBACK timers
 427         if(sys_supportsdlgetticks && sys_usesdlgetticks.integer)
 428                 return (double) Sys_SDL_GetTicks() / 1000.0;
 429 #if HAVE_GETTIMEOFDAY
 430         {
 431                 struct timeval tp;
 432                 gettimeofday(&tp, NULL);
 433                 return (double) tp.tv_sec + tp.tv_usec / 1000000.0;
 434         }
 435 #elif HAVE_TIMEGETTIME
 436         {
 437                 static int firsttimegettime = true;
 438                 // timeGetTime
 439                 // platform:
 440                 // Windows 95/98/ME/NT/2000/XP
 441                 // features:
 442                 // reasonable accuracy (millisecond)
 443                 // issues:
 444                 // wraps around every 47 days or so (but this is non-fatal to us, odd times are rejected, only causes a one frame stutter)
 445
 446                 // make sure the timer is high precision, otherwise different versions of windows have varying accuracy
 447                 if (firsttimegettime)
 448                 {
 449                         timeBeginPeriod(1);
 450                         firsttimegettime = false;
 451                 }
 452
 453                 return (double) timeGetTime() / 1000.0;
 454         }
 455 #else
 456         // fallback for using the SDL timer if no other timer is available
 457         // this calls Sys_Error() if not linking against SDL
 458         return (double) Sys_SDL_GetTicks() / 1000.0;
 459 #endif
 460 }
 461
 462 extern cvar_t host_maxwait;
 463 double Sys_Sleep(double time)
 464 {
 465         double dt;
 466         uint32_t microseconds;
 467
 468         // convert to microseconds
 469         time *= 1000000.0;
 470
 471         if(host_maxwait.value <= 0)
 472                 time = min(time, 1000000.0);
 473         else
 474                 time = min(time, host_maxwait.value * 1000.0);
 475
 476         if (time < 1 || host.restless)
 477                 return 0; // not sleeping this frame
 478
 479         microseconds = time; // post-validation to prevent overflow
 480
 481         if(sys_usenoclockbutbenchmark.integer)
 482         {
 483                 double old_benchmark_time = benchmark_time;
 484                 benchmark_time += microseconds;
 485                 if(benchmark_time == old_benchmark_time)
 486                         Sys_Error("sys_usenoclockbutbenchmark cannot run any longer, sorry");
 487                 return 0;
 488         }
 489
 490         if(sys_debugsleep.integer)
 491                 Sys_Printf("sys_debugsleep: requesting %u ", microseconds);
 492         dt = Sys_DirtyTime();
 493
 494         // less important on newer libcurl so no need to disturb dedicated servers
 495         if (cls.state != ca_dedicated && Curl_Select(microseconds))
 496         {
 497                 // a transfer is ready or we finished sleeping
 498         }
 499         else if(sys_supportsdlgetticks && sys_usesdldelay.integer)
 500                 Sys_SDL_Delay(microseconds / 1000);
 501 #if HAVE_SELECT
 502         else
 503         {
 504                 struct timeval tv;
 505                 lhnetsocket_t *s;
 506                 fd_set fdreadset;
 507                 int lastfd = -1;
 508
 509                 FD_ZERO(&fdreadset);
 510                 if (cls.state == ca_dedicated && sv_checkforpacketsduringsleep.integer)
 511                 {
 512                         List_For_Each_Entry(s, &lhnet_socketlist.list, lhnetsocket_t, list)
 513                         {
 514                                 if (s->address.addresstype == LHNETADDRESSTYPE_INET4 || s->address.addresstype == LHNETADDRESSTYPE_INET6)
 515                                 {
 516                                         if (lastfd < s->inetsocket)
 517                                                 lastfd = s->inetsocket;
 518         #if defined(WIN32) && !defined(_MSC_VER)
 519                                         FD_SET((int)s->inetsocket, &fdreadset);
 520         #else
 521                                         FD_SET((unsigned int)s->inetsocket, &fdreadset);
 522         #endif
 523                                 }
 524                         }
 525                 }
 526                 tv.tv_sec = microseconds / 1000000;
 527                 tv.tv_usec = microseconds % 1000000;
 528                 // on Win32, select() cannot be used with all three FD list args being NULL according to MSDN
 529                 // (so much for POSIX...)
 530                 // bones_was_here: but a zeroed fd_set seems to be tolerated (tested on Win 7)
 531                 select(lastfd + 1, &fdreadset, NULL, NULL, &tv);
 532         }
 533 #elif HAVE_USLEEP
 534         else
 535                 usleep(microseconds);
 536 #elif HAVE_Sleep
 537         else
 538                 Sleep(microseconds / 1000);
 539 #else
 540         else
 541                 Sys_SDL_Delay(microseconds / 1000);
 542 #endif
 543
 544         dt = Sys_DirtyTime() - dt;
 545         if(sys_debugsleep.integer)
 546                 Sys_Printf(" got %u oversleep %d\n", (unsigned int)(dt * 1000000), (unsigned int)(dt * 1000000) - microseconds);
 547         return (dt < 0 || dt >= 1800) ? 0 : dt;
 548 }
 549
 550 void Sys_Print(const char *text)
 551 {
 552 #ifdef __ANDROID__
 553         if (developer.integer > 0)
 554         {
 555                 __android_log_write(ANDROID_LOG_DEBUG, sys.argv[0], text);
 556         }
 557 #else
 558         if(sys.outfd < 0)
 559                 return;
 560   #ifndef WIN32
 561         // BUG: for some reason, NDELAY also affects stdout (1) when used on stdin (0).
 562         // this is because both go to /dev/tty by default!
 563         {
 564                 int origflags = fcntl (sys.outfd, F_GETFL, 0);
 565                 fcntl (sys.outfd, F_SETFL, origflags & ~O_NONBLOCK);
 566   #else
 567     #define write _write
 568   #endif
 569                 while(*text)
 570                 {
 571                         fs_offset_t written = (fs_offset_t)write(sys.outfd, text, (int)strlen(text));
 572                         if(written <= 0)
 573                                 break; // sorry, I cannot do anything about this error - without an output
 574                         text += written;
 575                 }
 576   #ifndef WIN32
 577                 fcntl (sys.outfd, F_SETFL, origflags);
 578         }
 579   #endif
 580         //fprintf(stdout, "%s", text);
 581 #endif
 582 }
 583
 584 void Sys_Printf(const char *fmt, ...)
 585 {
 586         va_list argptr;
 587         char msg[MAX_INPUTLINE];
 588
 589         va_start(argptr,fmt);
 590         dpvsnprintf(msg,sizeof(msg),fmt,argptr);
 591         va_end(argptr);
 592
 593         Sys_Print(msg);
 594 }
 595
 596 char *Sys_ConsoleInput(void)
 597 {
 598         static char text[MAX_INPUTLINE];
 599         static unsigned int len = 0;
 600 #ifdef WIN32
 601         int c;
 602
 603         // read a line out
 604         while (_kbhit ())
 605         {
 606                 c = _getch ();
 607                 if (c == '\r')
 608                 {
 609                         text[len] = '\0';
 610                         _putch ('\n');
 611                         len = 0;
 612                         return text;
 613                 }
 614                 if (c == '\b')
 615                 {
 616                         if (len)
 617                         {
 618                                 _putch (c);
 619                                 _putch (' ');
 620                                 _putch (c);
 621                                 len--;
 622                         }
 623                         continue;
 624                 }
 625                 if (len < sizeof (text) - 1)
 626                 {
 627                         _putch (c);
 628                         text[len] = c;
 629                         len++;
 630                 }
 631         }
 632 #else
 633         fd_set fdset;
 634         struct timeval timeout;
 635         FD_ZERO(&fdset);
 636         FD_SET(0, &fdset); // stdin
 637         timeout.tv_sec = 0;
 638         timeout.tv_usec = 0;
 639         if (select (1, &fdset, NULL, NULL, &timeout) != -1 && FD_ISSET(0, &fdset))
 640         {
 641                 len = read (0, text, sizeof(text) - 1);
 642                 if (len >= 1)
 643                 {
 644                         // rip off the \n and terminate
 645                         // div0: WHY? console code can deal with \n just fine
 646                         // this caused problems with pasting stuff into a terminal window
 647                         // so, not ripping off the \n, but STILL keeping a NUL terminator
 648                         text[len] = 0;
 649                         return text;
 650                 }
 651         }
 652 #endif
 653         return NULL;
 654 }
 655
 656
 657 void Sys_Error (const char *error, ...)
 658 {
 659         va_list argptr;
 660         char string[MAX_INPUTLINE];
 661
 662 // change stdin to non blocking
 663 #ifndef WIN32
 664         fcntl (0, F_SETFL, fcntl (0, F_GETFL, 0) & ~O_NONBLOCK);
 665 #endif
 666
 667         va_start (argptr,error);
 668         dpvsnprintf (string, sizeof (string), error, argptr);
 669         va_end (argptr);
 670
 671         Con_Printf(CON_ERROR "Engine Error: %s\n", string);
 672
 673         // don't want a dead window left blocking the OS UI or the crash dialog
 674         Host_Shutdown();
 675
 676         Sys_SDL_Dialog("Engine Error", string);
 677
 678         exit (1);
 679 }
 680
 681 #ifndef WIN32
 682 static const char *Sys_FindInPATH(const char *name, char namesep, const char *PATH, char pathsep, char *buf, size_t bufsize)
 683 {
 684         const char *p = PATH;
 685         const char *q;
 686         if(p && name)
 687         {
 688                 while((q = strchr(p, ':')))
 689                 {
 690                         dpsnprintf(buf, bufsize, "%.*s%c%s", (int)(q-p), p, namesep, name);
 691                         if(FS_SysFileExists(buf))
 692                                 return buf;
 693                         p = q + 1;
 694                 }
 695                 if(!q) // none found - try the last item
 696                 {
 697                         dpsnprintf(buf, bufsize, "%s%c%s", p, namesep, name);
 698                         if(FS_SysFileExists(buf))
 699                                 return buf;
 700                 }
 701         }
 702         return name;
 703 }
 704 #endif
 705
 706 static const char *Sys_FindExecutableName(void)
 707 {
 708 #if defined(WIN32)
 709         return sys.argv[0];
 710 #else
 711         static char exenamebuf[MAX_OSPATH+1];
 712         ssize_t n = -1;
 713 #if defined(__FreeBSD__)
 714         int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1};
 715         size_t exenamebuflen = sizeof(exenamebuf)-1;
 716         if (sysctl(mib, 4, exenamebuf, &exenamebuflen, NULL, 0) == 0)
 717         {
 718                 n = exenamebuflen;
 719         }
 720 #elif defined(__linux__)
 721         n = readlink("/proc/self/exe", exenamebuf, sizeof(exenamebuf)-1);
 722 #endif
 723         if(n > 0 && (size_t)(n) < sizeof(exenamebuf))
 724         {
 725                 exenamebuf[n] = 0;
 726                 return exenamebuf;
 727         }
 728         if(strchr(sys.argv[0], '/'))
 729                 return sys.argv[0]; // possibly a relative path
 730         else
 731                 return Sys_FindInPATH(sys.argv[0], '/', getenv("PATH"), ':', exenamebuf, sizeof(exenamebuf));
 732 #endif
 733 }
 734
 735 void Sys_ProvideSelfFD(void)
 736 {
 737         if(sys.selffd != -1)
 738                 return;
 739         sys.selffd = FS_SysOpenFD(Sys_FindExecutableName(), "rb", false);
 740 }
 741
 742 // for x86 cpus only...  (x64 has SSE2_PRESENT)
 743 #if defined(SSE_POSSIBLE) && !defined(SSE2_PRESENT)
 744 // code from SDL, shortened as we can expect CPUID to work
 745 static int CPUID_Features(void)
 746 {
 747         int features = 0;
 748 # if (defined(__GNUC__) || defined(__clang__) || defined(__TINYC__)) && defined(__i386__)
 749         __asm__ (
 750 "        movl    %%ebx,%%edi\n"
 751 "        xorl    %%eax,%%eax                                           \n"
 752 "        incl    %%eax                                                 \n"
 753 "        cpuid                       # Get family/model/stepping/features\n"
 754 "        movl    %%edx,%0                                              \n"
 755 "        movl    %%edi,%%ebx\n"
 756         : "=m" (features)
 757         :
 758         : "%eax", "%ecx", "%edx", "%edi"
 759         );
 760 # elif (defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)
 761         __asm {
 762         xor     eax, eax
 763         inc     eax
 764         cpuid                       ; Get family/model/stepping/features
 765         mov     features, edx
 766         }
 767 # else
 768 #  error SSE_POSSIBLE set but no CPUID implementation
 769 # endif
 770         return features;
 771 }
 772 #endif
 773
 774 #ifdef SSE_POSSIBLE
 775 qbool Sys_HaveSSE(void)
 776 {
 777         // COMMANDLINEOPTION: SSE: -nosse disables SSE support and detection
 778         if(Sys_CheckParm("-nosse"))
 779                 return false;
 780 #ifdef SSE_PRESENT
 781         return true;
 782 #else
 783         // COMMANDLINEOPTION: SSE: -forcesse enables SSE support and disables detection
 784         if(Sys_CheckParm("-forcesse") || Sys_CheckParm("-forcesse2"))
 785                 return true;
 786         if(CPUID_Features() & (1 << 25))
 787                 return true;
 788         return false;
 789 #endif
 790 }
 791
 792 qbool Sys_HaveSSE2(void)
 793 {
 794         // COMMANDLINEOPTION: SSE2: -nosse2 disables SSE2 support and detection
 795         if(Sys_CheckParm("-nosse") || Sys_CheckParm("-nosse2"))
 796                 return false;
 797 #ifdef SSE2_PRESENT
 798         return true;
 799 #else
 800         // COMMANDLINEOPTION: SSE2: -forcesse2 enables SSE2 support and disables detection
 801         if(Sys_CheckParm("-forcesse2"))
 802                 return true;
 803         if((CPUID_Features() & (3 << 25)) == (3 << 25)) // SSE is 1<<25, SSE2 is 1<<26
 804                 return true;
 805         return false;
 806 #endif
 807 }
 808 #endif
 809
 810 /// called to set process priority for dedicated servers
 811 #if defined(__linux__)
 812 #include <sys/resource.h>
 813 #include <errno.h>
 814
 815 void Sys_InitProcessNice (void)
 816 {
 817         struct rlimit lim;
 818         sys.nicepossible = false;
 819         if(Sys_CheckParm("-nonice"))
 820                 return;
 821         errno = 0;
 822         sys.nicelevel = getpriority(PRIO_PROCESS, 0);
 823         if(errno)
 824         {
 825                 Con_Printf("Kernel does not support reading process priority - cannot use niceness\n");
 826                 return;
 827         }
 828         if(getrlimit(RLIMIT_NICE, &lim))
 829         {
 830                 Con_Printf("Kernel does not support lowering nice level again - cannot use niceness\n");
 831                 return;
 832         }
 833         if(lim.rlim_cur != RLIM_INFINITY && sys.nicelevel < (int) (20 - lim.rlim_cur))
 834         {
 835                 Con_Printf("Current nice level is below the soft limit - cannot use niceness\n");
 836                 return;
 837         }
 838         sys.nicepossible = true;
 839         sys.isnice = false;
 840 }
 841 void Sys_MakeProcessNice (void)
 842 {
 843         if(!sys.nicepossible)
 844                 return;
 845         if(sys.isnice)
 846                 return;
 847         Con_DPrintf("Process is becoming 'nice'...\n");
 848         if(setpriority(PRIO_PROCESS, 0, 19))
 849                 Con_Printf(CON_ERROR "Failed to raise nice level to %d\n", 19);
 850         sys.isnice = true;
 851 }
 852 void Sys_MakeProcessMean (void)
 853 {
 854         if(!sys.nicepossible)
 855                 return;
 856         if(!sys.isnice)
 857                 return;
 858         Con_DPrintf("Process is becoming 'mean'...\n");
 859         if(setpriority(PRIO_PROCESS, 0, sys.nicelevel))
 860                 Con_Printf(CON_ERROR "Failed to lower nice level to %d\n", sys.nicelevel);
 861         sys.isnice = false;
 862 }
 863 #else
 864 void Sys_InitProcessNice (void)
 865 {
 866 }
 867 void Sys_MakeProcessNice (void)
 868 {
 869 }
 870 void Sys_MakeProcessMean (void)
 871 {
 872 }
 873 #endif
 874
 875 int main (int argc, char **argv)
 876 {
 877         signal(SIGFPE, SIG_IGN);
 878
 879         sys.argc = argc;
 880         sys.argv = (const char **)argv;
 881
 882         // COMMANDLINEOPTION: -noterminal disables console output on stdout
 883         if(Sys_CheckParm("-noterminal"))
 884                 sys.outfd = -1;
 885         // COMMANDLINEOPTION: -stderr moves console output to stderr
 886         else if(Sys_CheckParm("-stderr"))
 887                 sys.outfd = 2;
 888         else
 889                 sys.outfd = 1;
 890
 891         sys.selffd = -1;
 892         Sys_ProvideSelfFD(); // may call Con_Printf() so must be after sys.outfd is set
 893
 894 #ifndef WIN32
 895         fcntl(0, F_SETFL, fcntl (0, F_GETFL, 0) | O_NONBLOCK);
 896 #endif
 897
 898 #ifdef __ANDROID__
 899         Sys_AllowProfiling(true);
 900 #endif
 901
 902         Host_Main();
 903
 904         Sys_Quit(0);
 905
 906         return 0;
 907 }