src/mesa/main/dlopen.h

   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 *
  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
  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
  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