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 "glheader.h"
  32 #include "imports.h"
  33 #include "dlopen.h"
  34
  35 #if defined(_GNU_SOURCE) && !defined(__MINGW32__)
  36 #include <dlfcn.h>
  37 #endif
  38
  39
  40 /**
  41  * Wrapper for dlopen().
  42  * Note that 'flags' isn't used at this time.
  43  */
  44 void *
  45 _mesa_dlopen(const char *libname, int flags)
  46 {
  47 #if defined(_GNU_SOURCE)
  48    flags = RTLD_LAZY | RTLD_GLOBAL; /* Overriding flags at this time */
  49    return dlopen(libname, flags);
  50 #elif defined(__MINGW32__)
  51    return LoadLibrary(libname);
  52 #else
  53    return NULL;
  54 #endif
  55 }
  56
  57
  58 /**
  59  * Wrapper for dlsym() that does a cast to a generic function type,
  60  * rather than a void *.  This reduces the number of warnings that are
  61  * generated.
  62  */
  63 GenericFunc
  64 _mesa_dlsym(void *handle, const char *fname)
  65 {
  66 #if defined(__DJGPP__)
  67    /* need '_' prefix on symbol names */
  68    char fname2[1000];
  69    fname2[0] = '_';
  70    _mesa_strncpy(fname2 + 1, fname, 998);
  71    fname2[999] = 0;
  72    return (GenericFunc) dlsym(handle, fname2);
  73 #elif defined(_GNU_SOURCE)
  74    return (GenericFunc) dlsym(handle, fname);
  75 #elif defined(__MINGW32__)
  76    return (GenericFunc) GetProcAddress(handle, fname);
  77 #else
  78    return (GenericFunc) NULL;
  79 #endif
  80 }
  81
  82
  83 /**
  84  * Wrapper for dlclose().
  85  */
  86 void
  87 _mesa_dlclose(void *handle)
  88 {
  89 #if defined(_GNU_SOURCE)
  90    dlclose(handle);
  91 #elif defined(__MINGW32__)
  92    FreeLibrary(handle);
  93 #else
  94    (void) handle;
  95 #endif
  96 }
  97
  98
  99