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 40typedef void (*GenericFunc)(void); 41 42/** 43 * Wrapper for dlopen(). 44 * Note that 'flags' isn't used at this time. 45 */ 46static 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 */ 66static 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 */ 95static 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