misc/system.c

   1 /*
   2  * SYSTEM DLL routines
   3  *
   4  * Copyright 1996 Alexandre Julliard
   5  */
   6
   7 #include <stdio.h>
   8 #include <stdlib.h>
   9 #include <signal.h>
  10 #include <time.h>
  11 #include <sys/time.h>
  12 #include <sys/timeb.h>
  13 #include <sys/types.h>
  14 #include <sys/wait.h>
  15
  16 #include "callback.h"
  17 #include "windows.h"
  18 #include "miscemu.h"
  19
  20 typedef struct
  21 {
  22     FARPROC16 callback;  /* NULL if not in use */
  23     INT32     rate;
  24     INT32     ticks;
  25 } SYSTEM_TIMER;
  26
  27 #define NB_SYS_TIMERS   8
  28 #define SYS_TIMER_RATE  54925
  29
  30 static SYSTEM_TIMER SYS_Timers[NB_SYS_TIMERS];
  31 static int SYS_NbTimers = 0;
  32 static BOOL32 SYS_TimersDisabled = FALSE;
  33
  34 /***********************************************************************
  35  *           SYSTEM_TimerTick
  36  */
  37 static void SYSTEM_TimerTick(void)
  38 {
  39     int i;
  40
  41     for (i = 0; i < NB_SYS_TIMERS; i++)
  42     {
  43         if (!SYS_Timers[i].callback) continue;
  44         if ((SYS_Timers[i].ticks -= SYS_TIMER_RATE) <= 0)
  45         {
  46             SYS_Timers[i].ticks += SYS_Timers[i].rate;
  47             Callbacks->CallSystemTimerProc( SYS_Timers[i].callback );
  48         }
  49     }
  50 }
  51
  52
  53 /**********************************************************************
  54  *           SYSTEM_StartTicks
  55  *
  56  * Start the system tick timer.
  57  */
  58 static void SYSTEM_StartTicks(void)
  59 {
  60     static BOOL32 handler_installed = FALSE;
  61
  62     if (!handler_installed)
  63     {
  64         handler_installed = TRUE;
  65         SIGNAL_SetHandler( SIGALRM, SYSTEM_TimerTick, 1 );
  66     }
  67 #ifndef __EMX__ /* FIXME: Time don't work... Use BIOS directly instead */
  68     {
  69         struct itimerval vt_timer;
  70
  71         vt_timer.it_interval.tv_sec = 0;
  72         vt_timer.it_interval.tv_usec = 54929;
  73         vt_timer.it_value = vt_timer.it_interval;
  74         setitimer( ITIMER_REAL, &vt_timer, NULL );
  75     }
  76 #endif
  77 }
  78
  79
  80 /**********************************************************************
  81  *           SYSTEM_StopTicks
  82  *
  83  * Stop the system tick timer.
  84  */
  85 static void SYSTEM_StopTicks(void)
  86 {
  87 #ifndef __EMX__ /* FIXME: Time don't work... Use BIOS directly instead */
  88     struct itimerval vt_timer;
  89
  90     vt_timer.it_interval.tv_sec = 0;
  91     vt_timer.it_interval.tv_usec = 0;
  92     vt_timer.it_value = vt_timer.it_interval;
  93     setitimer( ITIMER_REAL, &vt_timer, NULL );
  94 #endif
  95 }
  96
  97
  98 /***********************************************************************
  99  *           InquireSystem   (SYSTEM.1)
 100  *
 101  * Note: the function always takes 2 WORD arguments, contrary to what
 102  *       "Undocumented Windows" says.
 103   */
 104 DWORD WINAPI InquireSystem( WORD code, WORD arg )
 105 {
 106     WORD drivetype;
 107
 108     switch(code)
 109     {
 110     case 0:  /* Get timer resolution */
 111         return SYS_TIMER_RATE;
 112
 113     case 1:  /* Get drive type */
 114         drivetype = GetDriveType16( arg );
 115         return MAKELONG( drivetype, drivetype );
 116
 117     case 2:  /* Enable one-drive logic */
 118         fprintf( stderr, "InquireSystem(2): set single-drive %d not supported\n", arg );
 119         return 0;
 120     }
 121     fprintf( stderr, "InquireSystem: unknown code %d\n", code );
 122     return 0;
 123 }
 124
 125
 126 /***********************************************************************
 127  *           CreateSystemTimer   (SYSTEM.2)
 128  */
 129 WORD WINAPI CreateSystemTimer( WORD rate, FARPROC16 callback )
 130 {
 131     int i;
 132
 133     for (i = 0; i < NB_SYS_TIMERS; i++)
 134         if (!SYS_Timers[i].callback)  /* Found one */
 135         {
 136             SYS_Timers[i].rate = (UINT32)rate * 1000;
 137             if (SYS_Timers[i].rate < SYS_TIMER_RATE)
 138                 SYS_Timers[i].rate = SYS_TIMER_RATE;
 139             SYS_Timers[i].ticks = SYS_Timers[i].rate;
 140             SYS_Timers[i].callback = callback;
 141             if ((++SYS_NbTimers == 1) && !SYS_TimersDisabled)
 142                 SYSTEM_StartTicks();
 143             return i + 1;  /* 0 means error */
 144         }
 145     return 0;
 146 }
 147
 148
 149 /***********************************************************************
 150  *           KillSystemTimer   (SYSTEM.3)
 151  *
 152  * Note: do not confuse this function with USER.182
 153  */
 154 WORD WINAPI SYSTEM_KillSystemTimer( WORD timer )
 155 {
 156     if (!timer || (timer > NB_SYS_TIMERS)) return timer;  /* Error */
 157     SYS_Timers[timer-1].callback = NULL;
 158     if ((!--SYS_NbTimers) && !SYS_TimersDisabled) SYSTEM_StopTicks();
 159     return 0;
 160 }
 161
 162
 163 /***********************************************************************
 164  *           EnableSystemTimers   (SYSTEM.4)
 165  */
 166 void WINAPI EnableSystemTimers(void)
 167 {
 168     SYS_TimersDisabled = FALSE;
 169     if (SYS_NbTimers) SYSTEM_StartTicks();
 170 }
 171
 172
 173 /***********************************************************************
 174  *           DisableSystemTimers   (SYSTEM.5)
 175  */
 176 void WINAPI DisableSystemTimers(void)
 177 {
 178     SYS_TimersDisabled = TRUE;
 179     if (SYS_NbTimers) SYSTEM_StopTicks();
 180 }