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  * 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 *
  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
  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
  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