Mercurial > sdl-ios-xcode

annotate src/timer/dummy/SDL_systimer.c @ 4355:9b464226e541 SDL-1.2

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Fixed bug #855 Ludwig Nussel 2009-10-18 06:31:52 PDT an mprotect call was added to fix bug 528. However that results in a buffer that allows writing and code execution. Ie the no-execute security features of modern operating systems are defeated this way. Two mprotect calls are needed. One to make the buffer executable but not writeable when done and another one to make the buffer writeable again if the content needs to be changed.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 18 Oct 2009 17:31:37 +0000
parents a1b03ba2fcd0
children
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 #if defined(SDL_TIMER_DUMMY) || defined(SDL_TIMERS_DISABLED)
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25
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26 #include "SDL_timer.h"
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27 #include "../SDL_timer_c.h"
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28
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29 void SDL_StartTicks(void)
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30 {
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31 }
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32
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33 Uint32 SDL_GetTicks (void)
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34 {
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35 SDL_Unsupported();
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36 return 0;
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37 }
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38
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39 void SDL_Delay (Uint32 ms)
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40 {
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41 SDL_Unsupported();
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42 }
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43
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44 #include "SDL_thread.h"
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45
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46 /* Data to handle a single periodic alarm */
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47 static int timer_alive = 0;
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48 static SDL_Thread *timer = NULL;
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49
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50 static int RunTimer(void *unused)
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51 {
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52 while ( timer_alive ) {
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53 if ( SDL_timer_running ) {
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54 SDL_ThreadedTimerCheck();
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55 }
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56 SDL_Delay(1);
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57 }
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58 return(0);
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59 }
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60
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61 /* This is only called if the event thread is not running */
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62 int SDL_SYS_TimerInit(void)
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63 {
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64 timer_alive = 1;
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65 timer = SDL_CreateThread(RunTimer, NULL);
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66 if ( timer == NULL )
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67 return(-1);
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68 return(SDL_SetTimerThreaded(1));
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69 }
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70
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71 void SDL_SYS_TimerQuit(void)
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72 {
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73 timer_alive = 0;
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74 if ( timer ) {
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75 SDL_WaitThread(timer, NULL);
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76 timer = NULL;
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77 }
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78 }
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79
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80 int SDL_SYS_StartTimer(void)
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81 {
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82 SDL_SetError("Internal logic error: threaded timer in use");
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83 return(-1);
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84 }
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85
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86 void SDL_SYS_StopTimer(void)
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87 {
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88 return;
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89 }
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90
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91 #endif /* SDL_TIMER_DUMMY || SDL_TIMERS_DISABLED */