sys_linux.c

   1 #include "quakedef.h"
   2
   3 #ifdef WIN32
   4 #include <io.h>
   5 #include "conio.h"
   6 #else
   7 #include <unistd.h>
   8 #include <fcntl.h>
   9 #include <sys/time.h>
  10 #endif
  11
  12 #include <signal.h>
  13
  14
  15 #ifdef WIN32
  16 cvar_t sys_usetimegettime = {CVAR_SAVE, "sys_usetimegettime", "1", "use windows timeGetTime function (which has issues on some motherboards) for timing rather than QueryPerformanceCounter timer (which has issues on multicore/multiprocessor machines and processors which are designed to conserve power)"};
  17 #endif
  18
  19
  20
  21 // =======================================================================
  22 // General routines
  23 // =======================================================================
  24 void Sys_Shutdown (void)
  25 {
  26 #ifndef WIN32
  27         fcntl (0, F_SETFL, fcntl (0, F_GETFL, 0) & ~FNDELAY);
  28 #endif
  29         fflush(stdout);
  30 }
  31
  32 void Sys_Error (const char *error, ...)
  33 {
  34         va_list argptr;
  35         char string[MAX_INPUTLINE];
  36
  37 // change stdin to non blocking
  38 #ifndef WIN32
  39         fcntl (0, F_SETFL, fcntl (0, F_GETFL, 0) & ~FNDELAY);
  40 #endif
  41
  42         va_start (argptr,error);
  43         dpvsnprintf (string, sizeof (string), error, argptr);
  44         va_end (argptr);
  45
  46         Con_Printf ("Quake Error: %s\n", string);
  47
  48         Host_Shutdown ();
  49         exit (1);
  50 }
  51
  52 void Sys_PrintToTerminal(const char *text)
  53 {
  54 #ifndef WIN32
  55         // BUG: for some reason, NDELAY also affects stdout (1) when used on stdin (0).
  56         int origflags = fcntl (1, F_GETFL, 0);
  57         fcntl (1, F_SETFL, origflags & ~FNDELAY);
  58 #endif
  59         while(*text)
  60         {
  61                 int written = (int)write(1, text, (int)strlen(text));
  62                 if(written <= 0)
  63                         break; // sorry, I cannot do anything about this error - without an output
  64                 text += written;
  65         }
  66 #ifndef WIN32
  67         fcntl (1, F_SETFL, origflags);
  68 #endif
  69         //fprintf(stdout, "%s", text);
  70 }
  71
  72 double Sys_DoubleTime (void)
  73 {
  74         static int first = true;
  75         static double oldtime = 0.0, curtime = 0.0;
  76         double newtime;
  77 #ifdef WIN32
  78 #include <mmsystem.h>
  79         // LordHavoc: note to people modifying this code, DWORD is specifically defined as an unsigned 32bit number, therefore the 65536.0 * 65536.0 is fine.
  80         if (sys_usetimegettime.integer)
  81         {
  82                 static int firsttimegettime = true;
  83                 // timeGetTime
  84                 // platform:
  85                 // Windows 95/98/ME/NT/2000/XP
  86                 // features:
  87                 // reasonable accuracy (millisecond)
  88                 // issues:
  89                 // wraps around every 47 days or so (but this is non-fatal to us, odd times are rejected, only causes a one frame stutter)
  90
  91                 // make sure the timer is high precision, otherwise different versions of windows have varying accuracy
  92                 if (firsttimegettime)
  93                 {
  94                         timeBeginPeriod (1);
  95                         firsttimegettime = false;
  96                 }
  97
  98                 newtime = (double) timeGetTime () / 1000.0;
  99         }
 100         else
 101         {
 102                 // QueryPerformanceCounter
 103                 // platform:
 104                 // Windows 95/98/ME/NT/2000/XP
 105                 // features:
 106                 // very accurate (CPU cycles)
 107                 // known issues:
 108                 // does not necessarily match realtime too well (tends to get faster and faster in win98)
 109                 // wraps around occasionally on some platforms (depends on CPU speed and probably other unknown factors)
 110                 double timescale;
 111                 LARGE_INTEGER PerformanceFreq;
 112                 LARGE_INTEGER PerformanceCount;
 113
 114                 if (!QueryPerformanceFrequency (&PerformanceFreq))
 115                 {
 116                         Con_Printf ("No hardware timer available\n");
 117                         // fall back to timeGetTime
 118                         Cvar_SetValueQuick(&sys_usetimegettime, true);
 119                         return Sys_DoubleTime();
 120                 }
 121                 QueryPerformanceCounter (&PerformanceCount);
 122
 123                 #ifdef __BORLANDC__
 124                 timescale = 1.0 / ((double) PerformanceFreq.u.LowPart + (double) PerformanceFreq.u.HighPart * 65536.0 * 65536.0);
 125                 newtime = ((double) PerformanceCount.u.LowPart + (double) PerformanceCount.u.HighPart * 65536.0 * 65536.0) * timescale;
 126                 #else
 127                 timescale = 1.0 / ((double) PerformanceFreq.LowPart + (double) PerformanceFreq.HighPart * 65536.0 * 65536.0);
 128                 newtime = ((double) PerformanceCount.LowPart + (double) PerformanceCount.HighPart * 65536.0 * 65536.0) * timescale;
 129                 #endif
 130         }
 131 #else
 132         struct timeval tp;
 133         gettimeofday(&tp, NULL);
 134         newtime = (double) tp.tv_sec + tp.tv_usec / 1000000.0;
 135 #endif
 136
 137         if (first)
 138         {
 139                 first = false;
 140                 oldtime = newtime;
 141         }
 142
 143         if (newtime < oldtime)
 144         {
 145                 // warn if it's significant
 146                 if (newtime - oldtime < -0.01)
 147                         Con_Printf("Sys_DoubleTime: time stepped backwards (went from %f to %f, difference %f)\n", oldtime, newtime, newtime - oldtime);
 148         }
 149         else
 150                 curtime += newtime - oldtime;
 151         oldtime = newtime;
 152
 153         return curtime;
 154 }
 155
 156 char *Sys_ConsoleInput(void)
 157 {
 158         if (cls.state == ca_dedicated)
 159         {
 160                 static char text[MAX_INPUTLINE];
 161                 static unsigned int len = 0;
 162 #ifdef WIN32
 163                 int c;
 164
 165                 // read a line out
 166                 while (_kbhit ())
 167                 {
 168                         c = _getch ();
 169                         if (c == '\r')
 170                         {
 171                                 text[len] = '\0';
 172                                 putch ('\n');
 173                                 len = 0;
 174                                 return text;
 175                         }
 176                         if (c == '\b')
 177                         {
 178                                 if (len)
 179                                 {
 180                                         putch (c);
 181                                         putch (' ');
 182                                         putch (c);
 183                                         len--;
 184                                 }
 185                                 continue;
 186                         }
 187                         if (len < sizeof (text) - 1)
 188                         {
 189                                 putch (c);
 190                                 text[len] = c;
 191                                 len++;
 192                         }
 193                 }
 194 #else
 195                 fd_set fdset;
 196                 struct timeval timeout;
 197                 FD_ZERO(&fdset);
 198                 FD_SET(0, &fdset); // stdin
 199                 timeout.tv_sec = 0;
 200                 timeout.tv_usec = 0;
 201                 if (select (1, &fdset, NULL, NULL, &timeout) != -1 && FD_ISSET(0, &fdset))
 202                 {
 203                         len = read (0, text, sizeof(text));
 204                         if (len >= 1)
 205                         {
 206                                 // rip off the \n and terminate
 207                                 text[len-1] = 0;
 208                                 return text;
 209                         }
 210                 }
 211 #endif
 212         }
 213         return NULL;
 214 }
 215
 216 void Sys_Sleep(int microseconds)
 217 {
 218 #ifdef WIN32
 219         Sleep(microseconds / 1000);
 220 #else
 221         usleep(microseconds);
 222 #endif
 223 }
 224
 225 char *Sys_GetClipboardData (void)
 226 {
 227         return NULL;
 228 }
 229
 230 void Sys_InitConsole (void)
 231 {
 232 }
 233
 234 void Sys_Init_Commands (void)
 235 {
 236 }
 237
 238 int main (int argc, char **argv)
 239 {
 240         signal(SIGFPE, SIG_IGN);
 241
 242         com_argc = argc;
 243         com_argv = (const char **)argv;
 244
 245 #ifndef WIN32
 246         fcntl(0, F_SETFL, fcntl (0, F_GETFL, 0) | FNDELAY);
 247 #endif
 248
 249         Host_Main();
 250
 251         return 0;
 252 }