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1 /*
2     SDL - Simple DirectMedia Layer
3     Copyright (C) 1997-2006 Sam Lantinga
4 
5     This library is free software; you can redistribute it and/or
6     modify it under the terms of the GNU Lesser General Public
7     License as published by the Free Software Foundation; either
8     version 2.1 of the License, or (at your option) any later version.
9 
10     This library is distributed in the hope that it will be useful,
11     but WITHOUT ANY WARRANTY; without even the implied warranty of
12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13     Lesser General Public License for more details.
14 
15     You should have received a copy of the GNU Lesser General Public
16     License along with this library; if not, write to the Free Software
17     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
18 
19     Sam Lantinga
20     slouken@libsdl.org
21 */
22 #include "SDL_config.h"
23 
24 /* Initialization code for SDL */
25 
26 #include "SDL.h"
27 #include "SDL_fatal.h"
28 #if !SDL_VIDEO_DISABLED
29 #include "video/SDL_leaks.h"
30 #endif
31 
32 #if SDL_THREAD_PTH
33 #include <pth.h>
34 #endif
35 
36 /* Initialization/Cleanup routines */
37 #if !SDL_JOYSTICK_DISABLED
38 extern int  SDL_JoystickInit(void);
39 extern void SDL_JoystickQuit(void);
40 #endif
41 #if !SDL_CDROM_DISABLED
42 extern int  SDL_CDROMInit(void);
43 extern void SDL_CDROMQuit(void);
44 #endif
45 #if !SDL_TIMERS_DISABLED
46 extern void SDL_StartTicks(void);
47 extern int  SDL_TimerInit(void);
48 extern void SDL_TimerQuit(void);
49 #endif
50 
51 /* The current SDL version */
52 static SDL_version version =
53 	{ SDL_MAJOR_VERSION, SDL_MINOR_VERSION, SDL_PATCHLEVEL };
54 
55 /* The initialized subsystems */
56 static Uint32 SDL_initialized = 0;
57 #if !SDL_TIMERS_DISABLED
58 static Uint32 ticks_started = 0;
59 #endif
60 
61 #ifdef CHECK_LEAKS
62 int surfaces_allocated = 0;
63 #endif
64 
SDL_InitSubSystem(Uint32 flags)65 int SDL_InitSubSystem(Uint32 flags)
66 {
67 #if !SDL_VIDEO_DISABLED
68 	/* Initialize the video/event subsystem */
69 	if ( (flags & SDL_INIT_VIDEO) && !(SDL_initialized & SDL_INIT_VIDEO) ) {
70 		if ( SDL_VideoInit(SDL_getenv("SDL_VIDEODRIVER"),
71 		                   (flags&SDL_INIT_EVENTTHREAD)) < 0 ) {
72 			return(-1);
73 		}
74 		SDL_initialized |= SDL_INIT_VIDEO;
75 	}
76 #else
77 	if ( flags & SDL_INIT_VIDEO ) {
78 		SDL_SetError("SDL not built with video support");
79 		return(-1);
80 	}
81 #endif
82 
83 #if !SDL_AUDIO_DISABLED
84 	/* Initialize the audio subsystem */
85 	if ( (flags & SDL_INIT_AUDIO) && !(SDL_initialized & SDL_INIT_AUDIO) ) {
86 		if ( SDL_AudioInit(SDL_getenv("SDL_AUDIODRIVER")) < 0 ) {
87 			return(-1);
88 		}
89 		SDL_initialized |= SDL_INIT_AUDIO;
90 	}
91 #else
92 	if ( flags & SDL_INIT_AUDIO ) {
93 		SDL_SetError("SDL not built with audio support");
94 		return(-1);
95 	}
96 #endif
97 
98 #if !SDL_TIMERS_DISABLED
99 	/* Initialize the timer subsystem */
100 	if ( ! ticks_started ) {
101 		SDL_StartTicks();
102 		ticks_started = 1;
103 	}
104 	if ( (flags & SDL_INIT_TIMER) && !(SDL_initialized & SDL_INIT_TIMER) ) {
105 		if ( SDL_TimerInit() < 0 ) {
106 			return(-1);
107 		}
108 		SDL_initialized |= SDL_INIT_TIMER;
109 	}
110 #else
111 	if ( flags & SDL_INIT_TIMER ) {
112 		SDL_SetError("SDL not built with timer support");
113 		return(-1);
114 	}
115 #endif
116 
117 #if !SDL_JOYSTICK_DISABLED
118 	/* Initialize the joystick subsystem */
119 	if ( (flags & SDL_INIT_JOYSTICK) &&
120 	     !(SDL_initialized & SDL_INIT_JOYSTICK) ) {
121 		if ( SDL_JoystickInit() < 0 ) {
122 			return(-1);
123 		}
124 		SDL_initialized |= SDL_INIT_JOYSTICK;
125 	}
126 #else
127 	if ( flags & SDL_INIT_JOYSTICK ) {
128 		SDL_SetError("SDL not built with joystick support");
129 		return(-1);
130 	}
131 #endif
132 
133 #if !SDL_CDROM_DISABLED
134 	/* Initialize the CD-ROM subsystem */
135 	if ( (flags & SDL_INIT_CDROM) && !(SDL_initialized & SDL_INIT_CDROM) ) {
136 		if ( SDL_CDROMInit() < 0 ) {
137 			return(-1);
138 		}
139 		SDL_initialized |= SDL_INIT_CDROM;
140 	}
141 #else
142 	if ( flags & SDL_INIT_CDROM ) {
143 		SDL_SetError("SDL not built with cdrom support");
144 		return(-1);
145 	}
146 #endif
147 	return(0);
148 }
149 
SDL_Init(Uint32 flags)150 int SDL_Init(Uint32 flags)
151 {
152 #if !SDL_THREADS_DISABLED && SDL_THREAD_PTH
153 	if (!pth_init()) {
154 		return -1;
155 	}
156 #endif
157 
158 	/* Clear the error message */
159 	SDL_ClearError();
160 
161 	/* Initialize the desired subsystems */
162 	if ( SDL_InitSubSystem(flags) < 0 ) {
163 		return(-1);
164 	}
165 
166 	/* Everything is initialized */
167 	if ( !(flags & SDL_INIT_NOPARACHUTE) ) {
168 		SDL_InstallParachute();
169 	}
170 	return(0);
171 }
172 
SDL_QuitSubSystem(Uint32 flags)173 void SDL_QuitSubSystem(Uint32 flags)
174 {
175 	/* Shut down requested initialized subsystems */
176 #if !SDL_CDROM_DISABLED
177 	if ( (flags & SDL_initialized & SDL_INIT_CDROM) ) {
178 		SDL_CDROMQuit();
179 		SDL_initialized &= ~SDL_INIT_CDROM;
180 	}
181 #endif
182 #if !SDL_JOYSTICK_DISABLED
183 	if ( (flags & SDL_initialized & SDL_INIT_JOYSTICK) ) {
184 		SDL_JoystickQuit();
185 		SDL_initialized &= ~SDL_INIT_JOYSTICK;
186 	}
187 #endif
188 #if !SDL_TIMERS_DISABLED
189 	if ( (flags & SDL_initialized & SDL_INIT_TIMER) ) {
190 		SDL_TimerQuit();
191 		SDL_initialized &= ~SDL_INIT_TIMER;
192 	}
193 #endif
194 #if !SDL_AUDIO_DISABLED
195 	if ( (flags & SDL_initialized & SDL_INIT_AUDIO) ) {
196 		SDL_AudioQuit();
197 		SDL_initialized &= ~SDL_INIT_AUDIO;
198 	}
199 #endif
200 #if !SDL_VIDEO_DISABLED
201 	if ( (flags & SDL_initialized & SDL_INIT_VIDEO) ) {
202 		SDL_VideoQuit();
203 		SDL_initialized &= ~SDL_INIT_VIDEO;
204 	}
205 #endif
206 }
207 
SDL_WasInit(Uint32 flags)208 Uint32 SDL_WasInit(Uint32 flags)
209 {
210 	if ( ! flags ) {
211 		flags = SDL_INIT_EVERYTHING;
212 	}
213 	return (SDL_initialized&flags);
214 }
215 
SDL_Quit(void)216 void SDL_Quit(void)
217 {
218 	/* Quit all subsystems */
219 #ifdef DEBUG_BUILD
220   printf("[SDL_Quit] : Enter! Calling QuitSubSystem()\n"); fflush(stdout);
221 #endif
222 	SDL_QuitSubSystem(SDL_INIT_EVERYTHING);
223 
224 #ifdef CHECK_LEAKS
225 #ifdef DEBUG_BUILD
226   printf("[SDL_Quit] : CHECK_LEAKS\n"); fflush(stdout);
227 #endif
228 
229 	/* Print the number of surfaces not freed */
230 	if ( surfaces_allocated != 0 ) {
231 		fprintf(stderr, "SDL Warning: %d SDL surfaces extant\n",
232 							surfaces_allocated);
233 	}
234 #endif
235 #ifdef DEBUG_BUILD
236   printf("[SDL_Quit] : SDL_UninstallParachute()\n"); fflush(stdout);
237 #endif
238 
239 	/* Uninstall any parachute signal handlers */
240 	SDL_UninstallParachute();
241 
242 #if !SDL_THREADS_DISABLED && SDL_THREAD_PTH
243 	pth_kill();
244 #endif
245 #ifdef DEBUG_BUILD
246   printf("[SDL_Quit] : Returning!\n"); fflush(stdout);
247 #endif
248 
249 }
250 
251 /* Return the library version number */
SDL_Linked_Version(void)252 const SDL_version * SDL_Linked_Version(void)
253 {
254 	return(&version);
255 }
256 
257 #if defined(__OS2__)
258 /* Building for OS/2 */
259 #ifdef __WATCOMC__
260 
261 #define INCL_DOSERRORS
262 #define INCL_DOSEXCEPTIONS
263 #include <os2.h>
264 
265 /* Exception handler to prevent the Audio thread hanging, making a zombie process! */
SDL_Main_ExceptionHandler(PEXCEPTIONREPORTRECORD pERepRec,PEXCEPTIONREGISTRATIONRECORD pERegRec,PCONTEXTRECORD pCtxRec,PVOID p)266 ULONG _System SDL_Main_ExceptionHandler(PEXCEPTIONREPORTRECORD pERepRec,
267                                         PEXCEPTIONREGISTRATIONRECORD pERegRec,
268                                         PCONTEXTRECORD pCtxRec,
269                                         PVOID p)
270 {
271   if (pERepRec->fHandlerFlags & EH_EXIT_UNWIND)
272     return XCPT_CONTINUE_SEARCH;
273   if (pERepRec->fHandlerFlags & EH_UNWINDING)
274     return XCPT_CONTINUE_SEARCH;
275   if (pERepRec->fHandlerFlags & EH_NESTED_CALL)
276     return XCPT_CONTINUE_SEARCH;
277 
278   /* Do cleanup at every fatal exception! */
279   if (((pERepRec->ExceptionNum & XCPT_SEVERITY_CODE) == XCPT_FATAL_EXCEPTION) &&
280       (pERepRec->ExceptionNum != XCPT_BREAKPOINT) &&
281       (pERepRec->ExceptionNum != XCPT_SINGLE_STEP)
282      )
283   {
284     if (SDL_initialized & SDL_INIT_AUDIO)
285     {
286       /* This removes the zombie audio thread in case of emergency. */
287 #ifdef DEBUG_BUILD
288       printf("[SDL_Main_ExceptionHandler] : Calling SDL_CloseAudio()!\n");
289 #endif
290       SDL_CloseAudio();
291     }
292   }
293   return (XCPT_CONTINUE_SEARCH);
294 }
295 
296 
297 EXCEPTIONREGISTRATIONRECORD SDL_Main_xcpthand = {0, SDL_Main_ExceptionHandler};
298 
299 /* The main DLL entry for DLL Initialization and Uninitialization: */
LibMain(unsigned hmod,unsigned termination)300 unsigned _System LibMain(unsigned hmod, unsigned termination)
301 {
302   if (termination)
303   {
304 #ifdef DEBUG_BUILD
305 /*    printf("[SDL DLL Unintialization] : Removing exception handler\n"); */
306 #endif
307     DosUnsetExceptionHandler(&SDL_Main_xcpthand);
308     return 1;
309   } else
310   {
311 #ifdef DEBUG_BUILD
312     /* Make stdout and stderr unbuffered! */
313     setbuf(stdout, NULL);
314     setbuf(stderr, NULL);
315 #endif
316     /* Fire up exception handler */
317 #ifdef DEBUG_BUILD
318 /*    printf("[SDL DLL Initialization] : Setting exception handler\n"); */
319 #endif
320     /* Set exception handler */
321     DosSetExceptionHandler(&SDL_Main_xcpthand);
322 
323     return 1;
324   }
325 }
326 #endif /* __WATCOMC__ */
327 
328 #elif defined(__WIN32__)  && !defined(__SYMBIAN32__)
329 
330 #if !defined(HAVE_LIBC) || (defined(__WATCOMC__) && defined(BUILD_DLL))
331 /* Need to include DllMain() on Watcom C for some reason.. */
332 #define WIN32_LEAN_AND_MEAN
333 #include <windows.h>
334 
_DllMainCRTStartup(HANDLE hModule,DWORD ul_reason_for_call,LPVOID lpReserved)335 BOOL APIENTRY _DllMainCRTStartup( HANDLE hModule,
336                        DWORD  ul_reason_for_call,
337                        LPVOID lpReserved )
338 {
339 	switch (ul_reason_for_call) {
340 		case DLL_PROCESS_ATTACH:
341 		case DLL_THREAD_ATTACH:
342 		case DLL_THREAD_DETACH:
343 		case DLL_PROCESS_DETACH:
344 			break;
345 	}
346 	return TRUE;
347 }
348 #endif /* building DLL with Watcom C */
349 
350 #endif /* OS/2 elif __WIN32__ */
351