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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  * 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
    110