src/video/x11/SDL_x11dyn.c
author Ryan C. Gordon <icculus@icculus.org>
Thu, 17 Nov 2005 02:35:15 +0000
changeset 1171 f84c6f1397cd
parent 1168 045f186426e1
child 1226 d05306f0dc21
permissions -rw-r--r--
Fixed crash when dynamic X11 fails to load system Xlib libraries at runtime.
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2004 Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Library General Public
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    License as published by the Free Software Foundation; either
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    version 2 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Library General Public License for more details.
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    You should have received a copy of the GNU Library General Public
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    License along with this library; if not, write to the Free
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    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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/*#define DEBUG_DYNAMIC_X11 1*/
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#include "SDL_x11dyn.h"
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#ifdef DEBUG_DYNAMIC_X11
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#include <stdio.h>
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#endif
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#ifdef X11_DYNAMIC
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#include <dlfcn.h>
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#include "SDL_name.h"
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#include "SDL_loadso.h"
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static const char *x11_library = X11_DYNAMIC;
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static void *x11_handle = NULL;
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static const char *x11ext_library = X11EXT_DYNAMIC;
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static void *x11ext_handle = NULL;
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static void *X11_GetSym(const char *fnname, int *rc)
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{
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	void *fn = NULL;
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	if (*rc) {  /* haven't already failed on a previous lookup? */
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		fn = SDL_LoadFunction(x11_handle, fnname);
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		#if DEBUG_DYNAMIC_X11
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		if (fn != NULL)
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			printf("X11: Found '%s' in libX11 (%p)\n", fnname, fn);
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		#endif
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		if (fn == NULL) {  /* not found? Check libX11ext ... */
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			fn = SDL_LoadFunction(x11ext_handle, fnname);
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			#if DEBUG_DYNAMIC_X11
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			if (fn != NULL)
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				printf("X11: Found '%s' in libXext (%p)\n", fnname, fn);
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			else
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				printf("X11: Symbol '%s' NOT FOUND!\n", fnname);
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			#endif
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		}
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		*rc = (fn != NULL);
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	}
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	return fn;
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}
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#endif  /* defined X11_DYNAMIC */
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/* Define all the function pointers... */
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#define SDL_X11_SYM(ret,fn,params) ret (*p##fn) params = NULL;
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#include "SDL_x11sym.h"
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#undef SDL_X11_SYM
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static int x11_load_refcount = 0;
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void SDL_X11_UnloadSymbols(void)
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{
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	/* Don't actually unload if more than one module is using the libs... */
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	if (x11_load_refcount > 0) {
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		if (--x11_load_refcount == 0) {
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			/* set all the function pointers to NULL. */
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			#define SDL_X11_SYM(ret,fn,params) p##fn = NULL;
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			#include "SDL_x11sym.h"
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			#undef SDL_X11_SYM
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			#ifdef X11_DYNAMIC
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			if (x11_handle != NULL) {
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				SDL_UnloadObject(x11_handle);
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				x11_handle = NULL;
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			}
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			if (x11ext_handle != NULL) {
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				SDL_UnloadObject(x11ext_handle);
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				x11ext_handle = NULL;
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			}
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			#endif
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		}
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	}
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}
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/* returns non-zero if all needed symbols were loaded. */
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int SDL_X11_LoadSymbols(void)
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{
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	int rc = 1;
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    /* deal with multiple modules (dga, x11, etc) needing these symbols... */
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	if (x11_load_refcount++ == 0) {
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		#ifdef X11_DYNAMIC
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			x11_handle = SDL_LoadObject(x11_library);
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			x11ext_handle = SDL_LoadObject(x11ext_library);
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			rc = ((x11_handle != NULL) && (x11ext_handle != NULL));
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			#define SDL_X11_SYM(r,fn,arg) p##fn = X11_GetSym(#fn, &rc);
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			#include "SDL_x11sym.h"
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			#undef SDL_X11_SYM
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			if (!rc)
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				SDL_X11_UnloadSymbols();  /* in case one of these loaded... */
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		#else
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			#define SDL_X11_SYM(r,fn,arg) p##fn = fn;
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			#include "SDL_x11sym.h"
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			#undef SDL_X11_SYM
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		#endif
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	}
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	return rc;
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}
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/* end of SDL_x11dyn.c ... */
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