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
40typedef void (*GenericFunc)(void);
41
42/**
43 * Wrapper for dlopen().
44 * Note that 'flags' isn't used at this time.
45 */
46static inline void *
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 */
66static inline GenericFunc
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 */
95static inline void
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