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      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
     98