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 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * OTHER DEALINGS IN THE SOFTWARE.
23 */
24
25
26 #ifndef DLOPEN_H
27 #define DLOPEN_H
28
29 /**
30 * Wrapper functions for dlopen(), dlsym(), dlclose().
31 * Note that the #ifdef tests for various environments should be expanded.
32 */
33
34 #if defined(HAVE_DLOPEN)
35 #include <dlfcn.h>
36 #endif
37 #if defined(_WIN32)
38 #include <windows.h>
39 #endif
40
41 typedef void (*GenericFunc)(void);
42
43 /**
44 * Wrapper for dlopen().
45 * Note that 'flags' isn't used at this time.
46 */
47 static inline void *
_mesa_dlopen(const char * libname,int flags)48 _mesa_dlopen(const char *libname, int flags)
49 {
50 #if defined(HAVE_DLOPEN)
51 flags = RTLD_LAZY | RTLD_GLOBAL; /* Overriding flags at this time */
52 return dlopen(libname, flags);
53 #elif defined(_WIN32)
54 return LoadLibraryA(libname);
55 #else
56 return NULL;
57 #endif
58 }
59
60 /**
61 * Wrapper for dlsym() that does a cast to a generic function type,
62 * rather than a void *. This reduces the number of warnings that are
63 * generated.
64 */
65 static inline GenericFunc
_mesa_dlsym(void * handle,const char * fname)66 _mesa_dlsym(void *handle, const char *fname)
67 {
68 union {
69 void *v;
70 GenericFunc f;
71 } u;
72 #if defined(HAVE_DLOPEN)
73 u.v = dlsym(handle, fname);
74 #elif defined(_WIN32)
75 u.v = (void *) GetProcAddress(handle, fname);
76 #else
77 u.v = NULL;
78 #endif
79 return u.f;
80 }
81
82 /**
83 * Wrapper for dlclose().
84 */
85 static inline void
_mesa_dlclose(void * handle)86 _mesa_dlclose(void *handle)
87 {
88 #if defined(HAVE_DLOPEN)
89 dlclose(handle);
90 #elif defined(_WIN32)
91 FreeLibrary(handle);
92 #else
93 (void) handle;
94 #endif
95 }
96
97 #endif
98