SDL  2.0
SDL_x11dyn.c
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1 /*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>
4 
5  This software is provided 'as-is', without any express or implied
6  warranty. In no event will the authors be held liable for any damages
7  arising from the use of this software.
8 
9  Permission is granted to anyone to use this software for any purpose,
10  including commercial applications, and to alter it and redistribute it
11  freely, subject to the following restrictions:
12 
13  1. The origin of this software must not be misrepresented; you must not
14  claim that you wrote the original software. If you use this software
15  in a product, an acknowledgment in the product documentation would be
16  appreciated but is not required.
17  2. Altered source versions must be plainly marked as such, and must not be
18  misrepresented as being the original software.
19  3. This notice may not be removed or altered from any source distribution.
20 */
21 #include "../../SDL_internal.h"
22 
23 #if SDL_VIDEO_DRIVER_X11
24 
25 #define DEBUG_DYNAMIC_X11 0
26 
27 #include "SDL_x11dyn.h"
28 
29 #if DEBUG_DYNAMIC_X11
30 #include <stdio.h>
31 #endif
32 
33 #ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
34 
35 #include "SDL_name.h"
36 #include "SDL_loadso.h"
37 
38 typedef struct
39 {
40  void *lib;
41  const char *libname;
42 } x11dynlib;
43 
44 #ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC
45 #define SDL_VIDEO_DRIVER_X11_DYNAMIC NULL
46 #endif
47 #ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XEXT
48 #define SDL_VIDEO_DRIVER_X11_DYNAMIC_XEXT NULL
49 #endif
50 #ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XCURSOR
51 #define SDL_VIDEO_DRIVER_X11_DYNAMIC_XCURSOR NULL
52 #endif
53 #ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XINERAMA
54 #define SDL_VIDEO_DRIVER_X11_DYNAMIC_XINERAMA NULL
55 #endif
56 #ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XINPUT2
57 #define SDL_VIDEO_DRIVER_X11_DYNAMIC_XINPUT2 NULL
58 #endif
59 #ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XRANDR
60 #define SDL_VIDEO_DRIVER_X11_DYNAMIC_XRANDR NULL
61 #endif
62 #ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XSS
63 #define SDL_VIDEO_DRIVER_X11_DYNAMIC_XSS NULL
64 #endif
65 #ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XVIDMODE
66 #define SDL_VIDEO_DRIVER_X11_DYNAMIC_XVIDMODE NULL
67 #endif
68 
69 static x11dynlib x11libs[] = {
72  {NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XCURSOR},
78 };
79 
80 static void *
81 X11_GetSym(const char *fnname, int *pHasModule)
82 {
83  int i;
84  void *fn = NULL;
85  for (i = 0; i < SDL_TABLESIZE(x11libs); i++) {
86  if (x11libs[i].lib != NULL) {
87  fn = SDL_LoadFunction(x11libs[i].lib, fnname);
88  if (fn != NULL)
89  break;
90  }
91  }
92 
93 #if DEBUG_DYNAMIC_X11
94  if (fn != NULL)
95  printf("X11: Found '%s' in %s (%p)\n", fnname, x11libs[i].libname, fn);
96  else
97  printf("X11: Symbol '%s' NOT FOUND!\n", fnname);
98 #endif
99 
100  if (fn == NULL)
101  *pHasModule = 0; /* kill this module. */
102 
103  return fn;
104 }
105 
106 #endif /* SDL_VIDEO_DRIVER_X11_DYNAMIC */
107 
108 /* Define all the function pointers and wrappers... */
109 #define SDL_X11_MODULE(modname)
110 #define SDL_X11_SYM(rc,fn,params,args,ret) SDL_DYNX11FN_##fn X11_##fn = NULL;
111 #include "SDL_x11sym.h"
112 #undef SDL_X11_MODULE
113 #undef SDL_X11_SYM
114 
115 /* Annoying varargs entry point... */
116 #ifdef X_HAVE_UTF8_STRING
117 SDL_DYNX11FN_XCreateIC X11_XCreateIC = NULL;
118 SDL_DYNX11FN_XGetICValues X11_XGetICValues = NULL;
119 #endif
120 
121 /* These SDL_X11_HAVE_* flags are here whether you have dynamic X11 or not. */
122 #define SDL_X11_MODULE(modname) int SDL_X11_HAVE_##modname = 0;
123 #define SDL_X11_SYM(rc,fn,params,args,ret)
124 #include "SDL_x11sym.h"
125 #undef SDL_X11_MODULE
126 #undef SDL_X11_SYM
127 
128 static int x11_load_refcount = 0;
129 
130 void
132 {
133  /* Don't actually unload if more than one module is using the libs... */
134  if (x11_load_refcount > 0) {
135  if (--x11_load_refcount == 0) {
136  int i;
137 
138  /* set all the function pointers to NULL. */
139 #define SDL_X11_MODULE(modname) SDL_X11_HAVE_##modname = 0;
140 #define SDL_X11_SYM(rc,fn,params,args,ret) X11_##fn = NULL;
141 #include "SDL_x11sym.h"
142 #undef SDL_X11_MODULE
143 #undef SDL_X11_SYM
144 
145 #ifdef X_HAVE_UTF8_STRING
146  X11_XCreateIC = NULL;
147  X11_XGetICValues = NULL;
148 #endif
149 
150 #ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
151  for (i = 0; i < SDL_TABLESIZE(x11libs); i++) {
152  if (x11libs[i].lib != NULL) {
153  SDL_UnloadObject(x11libs[i].lib);
154  x11libs[i].lib = NULL;
155  }
156  }
157 #endif
158  }
159  }
160 }
161 
162 /* returns non-zero if all needed symbols were loaded. */
163 int
165 {
166  int rc = 1; /* always succeed if not using Dynamic X11 stuff. */
167 
168  /* deal with multiple modules (dga, x11, etc) needing these symbols... */
169  if (x11_load_refcount++ == 0) {
170 #ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
171  int i;
172  int *thismod = NULL;
173  for (i = 0; i < SDL_TABLESIZE(x11libs); i++) {
174  if (x11libs[i].libname != NULL) {
175  x11libs[i].lib = SDL_LoadObject(x11libs[i].libname);
176  }
177  }
178 
179 #define SDL_X11_MODULE(modname) SDL_X11_HAVE_##modname = 1; /* default yes */
180 #define SDL_X11_SYM(a,fn,x,y,z)
181 #include "SDL_x11sym.h"
182 #undef SDL_X11_MODULE
183 #undef SDL_X11_SYM
184 
185 #define SDL_X11_MODULE(modname) thismod = &SDL_X11_HAVE_##modname;
186 #define SDL_X11_SYM(a,fn,x,y,z) X11_##fn = (SDL_DYNX11FN_##fn) X11_GetSym(#fn,thismod);
187 #include "SDL_x11sym.h"
188 #undef SDL_X11_MODULE
189 #undef SDL_X11_SYM
190 
191 #ifdef X_HAVE_UTF8_STRING
192  X11_XCreateIC = (SDL_DYNX11FN_XCreateIC)
193  X11_GetSym("XCreateIC", &SDL_X11_HAVE_UTF8);
194  X11_XGetICValues = (SDL_DYNX11FN_XGetICValues)
195  X11_GetSym("XGetICValues", &SDL_X11_HAVE_UTF8);
196 #endif
197 
198  if (SDL_X11_HAVE_BASEXLIB) {
199  /* all required symbols loaded. */
200  SDL_ClearError();
201  } else {
202  /* in case something got loaded... */
204  rc = 0;
205  }
206 
207 #else /* no dynamic X11 */
208 
209 #define SDL_X11_MODULE(modname) SDL_X11_HAVE_##modname = 1; /* default yes */
210 #define SDL_X11_SYM(a,fn,x,y,z) X11_##fn = (SDL_DYNX11FN_##fn) fn;
211 #include "SDL_x11sym.h"
212 #undef SDL_X11_MODULE
213 #undef SDL_X11_SYM
214 
215 #ifdef X_HAVE_UTF8_STRING
216  X11_XCreateIC = XCreateIC;
217  X11_XGetICValues = XGetICValues;
218 #endif
219 #endif
220  }
221 
222  return rc;
223 }
224 
225 #endif /* SDL_VIDEO_DRIVER_X11 */
226 
227 /* vi: set ts=4 sw=4 expandtab: */
#define SDL_ClearError
#define SDL_LoadObject
#define SDL_UnloadObject
#define SDL_VIDEO_DRIVER_X11_DYNAMIC_XSS
#define SDL_VIDEO_DRIVER_X11_DYNAMIC_XINPUT2
#define SDL_VIDEO_DRIVER_X11_DYNAMIC_XINERAMA
int SDL_X11_LoadSymbols(void)
#define SDL_VIDEO_DRIVER_X11_DYNAMIC_XEXT
#define SDL_TABLESIZE(table)
Definition: SDL_stdinc.h:94
#define SDL_VIDEO_DRIVER_X11_DYNAMIC
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int in i)
Definition: SDL_x11sym.h:42
#define NULL
Definition: begin_code.h:143
#define SDL_VIDEO_DRIVER_X11_DYNAMIC_XVIDMODE
void SDL_X11_UnloadSymbols(void)
void * SDL_LoadFunction(void *handle, const char *name)
#define SDL_VIDEO_DRIVER_X11_DYNAMIC_XRANDR