1 /*
2 * Mesa 3-D graphics library
3 *
4 * Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included
14 * in all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
17 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
20 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
21 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
22 */
23
24
25 #ifndef DLOPEN_H
26 #define DLOPEN_H
27
28 /**
29 * Wrapper functions for dlopen(), dlsym(), dlclose().
30 * Note that the #ifdef tests for various environments should be expanded.
31 */
32
33 #if defined(HAVE_DLOPEN)
34 #include <dlfcn.h>
35 #endif
36 #if defined(_WIN32)
37 #include <windows.h>
38 #endif
39
40 typedef void (*GenericFunc)(void);
41
42 /**
43 * Wrapper for dlopen().
44 * Note that 'flags' isn't used at this time.
45 */
46 static inline void *
_mesa_dlopen(const char * libname,int flags)47 _mesa_dlopen(const char *libname, int flags)
48 {
49 #if defined(__blrts)
50 return NULL;
51 #elif defined(HAVE_DLOPEN)
52 flags = RTLD_LAZY | RTLD_GLOBAL; /* Overriding flags at this time */
53 return dlopen(libname, flags);
54 #elif defined(__MINGW32__)
55 return LoadLibraryA(libname);
56 #else
57 return NULL;
58 #endif
59 }
60
61 /**
62 * Wrapper for dlsym() that does a cast to a generic function type,
63 * rather than a void *. This reduces the number of warnings that are
64 * generated.
65 */
66 static inline GenericFunc
_mesa_dlsym(void * handle,const char * fname)67 _mesa_dlsym(void *handle, const char *fname)
68 {
69 union {
70 void *v;
71 GenericFunc f;
72 } u;
73 #if defined(__blrts)
74 u.v = NULL;
75 #elif defined(__DJGPP__)
76 /* need '_' prefix on symbol names */
77 char fname2[1000];
78 fname2[0] = '_';
79 strncpy(fname2 + 1, fname, 998);
80 fname2[999] = 0;
81 u.v = dlsym(handle, fname2);
82 #elif defined(HAVE_DLOPEN)
83 u.v = dlsym(handle, fname);
84 #elif defined(__MINGW32__)
85 u.v = (void *) GetProcAddress(handle, fname);
86 #else
87 u.v = NULL;
88 #endif
89 return u.f;
90 }
91
92 /**
93 * Wrapper for dlclose().
94 */
95 static inline void
_mesa_dlclose(void * handle)96 _mesa_dlclose(void *handle)
97 {
98 #if defined(__blrts)
99 (void) handle;
100 #elif defined(HAVE_DLOPEN)
101 dlclose(handle);
102 #elif defined(__MINGW32__)
103 FreeLibrary(handle);
104 #else
105 (void) handle;
106 #endif
107 }
108
109 #endif
110