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annotate src/video/x11/SDL_x11dyn.c @ 1171:f84c6f1397cd

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Fixed crash when dynamic X11 fails to load system Xlib libraries at runtime.
author Ryan C. Gordon <icculus@icculus.org>
date Thu, 17 Nov 2005 02:35:15 +0000
parents 045f186426e1
children d05306f0dc21
rev   line source
1168
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2004 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 Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 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 Library 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 Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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
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23 /*#define DEBUG_DYNAMIC_X11 1*/
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24
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25 #include "SDL_x11dyn.h"
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26
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27 #ifdef DEBUG_DYNAMIC_X11
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28 #include <stdio.h>
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29 #endif
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30
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31 #ifdef X11_DYNAMIC
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32 #include <dlfcn.h>
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33 #include "SDL_name.h"
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34 #include "SDL_loadso.h"
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35 static const char *x11_library = X11_DYNAMIC;
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36 static void *x11_handle = NULL;
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37 static const char *x11ext_library = X11EXT_DYNAMIC;
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38 static void *x11ext_handle = NULL;
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39
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40 static void *X11_GetSym(const char *fnname, int *rc)
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41 {
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42 void *fn = NULL;
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43 if (*rc) { /* haven't already failed on a previous lookup? */
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44 fn = SDL_LoadFunction(x11_handle, fnname);
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45 #if DEBUG_DYNAMIC_X11
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46 if (fn != NULL)
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47 printf("X11: Found '%s' in libX11 (%p)\n", fnname, fn);
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48 #endif
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49
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50 if (fn == NULL) { /* not found? Check libX11ext ... */
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51 fn = SDL_LoadFunction(x11ext_handle, fnname);
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52 #if DEBUG_DYNAMIC_X11
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53 if (fn != NULL)
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54 printf("X11: Found '%s' in libXext (%p)\n", fnname, fn);
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55 else
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56 printf("X11: Symbol '%s' NOT FOUND!\n", fnname);
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57 #endif
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58 }
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59 *rc = (fn != NULL);
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60 }
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61
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62 return fn;
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63 }
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64 #endif /* defined X11_DYNAMIC */
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65
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66 /* Define all the function pointers... */
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67 #define SDL_X11_SYM(ret,fn,params) ret (*p##fn) params = NULL;
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68 #include "SDL_x11sym.h"
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69 #undef SDL_X11_SYM
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70
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71 static int x11_load_refcount = 0;
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72
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73 void SDL_X11_UnloadSymbols(void)
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74 {
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75 /* Don't actually unload if more than one module is using the libs... */
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76 if (x11_load_refcount > 0) {
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77 if (--x11_load_refcount == 0) {
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78 /* set all the function pointers to NULL. */
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79 #define SDL_X11_SYM(ret,fn,params) p##fn = NULL;
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80 #include "SDL_x11sym.h"
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81 #undef SDL_X11_SYM
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82
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83 #ifdef X11_DYNAMIC
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84 if (x11_handle != NULL) {
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85 SDL_UnloadObject(x11_handle);
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86 x11_handle = NULL;
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87 }
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88 if (x11ext_handle != NULL) {
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89 SDL_UnloadObject(x11ext_handle);
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90 x11ext_handle = NULL;
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91 }
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92 #endif
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93 }
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94 }
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95 }
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96
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97 /* returns non-zero if all needed symbols were loaded. */
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98 int SDL_X11_LoadSymbols(void)
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99 {
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100 int rc = 1;
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101
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102 /* deal with multiple modules (dga, x11, etc) needing these symbols... */
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103 if (x11_load_refcount++ == 0) {
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104 #ifdef X11_DYNAMIC
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105 x11_handle = SDL_LoadObject(x11_library);
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106 x11ext_handle = SDL_LoadObject(x11ext_library);
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107 rc = ((x11_handle != NULL) && (x11ext_handle != NULL));
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108 #define SDL_X11_SYM(r,fn,arg) p##fn = X11_GetSym(#fn, &rc);
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109 #include "SDL_x11sym.h"
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110 #undef SDL_X11_SYM
1168
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111
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112 if (!rc)
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113 SDL_X11_UnloadSymbols(); /* in case one of these loaded... */
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114
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115 #else
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116 #define SDL_X11_SYM(r,fn,arg) p##fn = fn;
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117 #include "SDL_x11sym.h"
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118 #undef SDL_X11_SYM
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119 #endif
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120 }
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121
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122 return rc;
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123 }
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124
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125 /* end of SDL_x11dyn.c ... */
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126