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(__blrts)
  51    return NULL;
  52 #elif defined(HAVE_DLOPEN)
  53    flags = RTLD_LAZY | RTLD_GLOBAL; /* Overriding flags at this time */
  54    return dlopen(libname, flags);
  55 #elif defined(__MINGW32__)
  56    return LoadLibraryA(libname);
  57 #else
  58    return NULL;
  59 #endif
  60 }
  61
  62 /**
  63  * Wrapper for dlsym() that does a cast to a generic function type,
  64  * rather than a void *.  This reduces the number of warnings that are
  65  * generated.
  66  */
  67 static inline GenericFunc
  68 _mesa_dlsym(void *handle, const char *fname)
  69 {
  70    union {
  71       void *v;
  72       GenericFunc f;
  73    } u;
  74 #if defined(__blrts)
  75    u.v = NULL;
  76 #elif defined(__DJGPP__)
  77    /* need '_' prefix on symbol names */
  78    char fname2[1000];
  79    fname2[0] = '_';
  80    strncpy(fname2 + 1, fname, 998);
  81    fname2[999] = 0;
  82    u.v = dlsym(handle, fname2);
  83 #elif defined(HAVE_DLOPEN)
  84    u.v = dlsym(handle, fname);
  85 #elif defined(__MINGW32__)
  86    u.v = (void *) GetProcAddress(handle, fname);
  87 #else
  88    u.v = NULL;
  89 #endif
  90    return u.f;
  91 }
  92
  93 /**
  94  * Wrapper for dlclose().
  95  */
  96 static inline void
  97 _mesa_dlclose(void *handle)
  98 {
  99 #if defined(__blrts)
 100    (void) handle;
 101 #elif defined(HAVE_DLOPEN)
 102    dlclose(handle);
 103 #elif defined(__MINGW32__)
 104    FreeLibrary(handle);
 105 #else
 106    (void) handle;
 107 #endif
 108 }
 109
 110 #endif