src/mesa/main/dlopen.c

   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 /**
  26  * Wrapper functions for dlopen(), dlsym(), dlclose().
  27  * Note that the #ifdef tests for various environments should be expanded.
  28  */
  29
  30
  31 #include "compiler.h"
  32 #include "dlopen.h"
  33
  34 #if defined(_GNU_SOURCE) && !defined(__MINGW32__) && !defined(__blrts)
  35 #include <dlfcn.h>
  36 #endif
  37 #if defined(_WIN32)
  38 #include <windows.h>
  39 #endif
  40
  41
  42 /**
  43  * Wrapper for dlopen().
  44  * Note that 'flags' isn't used at this time.
  45  */
  46 void *
  47 _mesa_dlopen(const char *libname, int flags)
  48 {
  49 #if defined(__blrts)
  50    return NULL;
  51 #elif defined(_GNU_SOURCE)
  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 /**
  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 GenericFunc
  68 _mesa_dlsym(void *handle, const char *fname)
  69 {
  70 #if defined(__blrts)
  71    return (GenericFunc) NULL;
  72 #elif defined(__DJGPP__)
  73    /* need '_' prefix on symbol names */
  74    char fname2[1000];
  75    fname2[0] = '_';
  76    strncpy(fname2 + 1, fname, 998);
  77    fname2[999] = 0;
  78    return (GenericFunc) dlsym(handle, fname2);
  79 #elif defined(_GNU_SOURCE)
  80    return (GenericFunc) dlsym(handle, fname);
  81 #elif defined(__MINGW32__)
  82    return (GenericFunc) GetProcAddress(handle, fname);
  83 #else
  84    return (GenericFunc) NULL;
  85 #endif
  86 }
  87
  88
  89 /**
  90  * Wrapper for dlclose().
  91  */
  92 void
  93 _mesa_dlclose(void *handle)
  94 {
  95 #if defined(__blrts)
  96    (void) handle;
  97 #elif defined(_GNU_SOURCE)
  98    dlclose(handle);
  99 #elif defined(__MINGW32__)
 100    FreeLibrary(handle);
 101 #else
 102    (void) handle;
 103 #endif
 104 }
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