| /* Copyright © 2013, Intel Corporation |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a copy |
| * of this software and associated documentation files (the "Software"), to deal |
| * in the Software without restriction, including without limitation the rights |
| * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| * copies of the Software, and to permit persons to whom the Software is |
| * furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in |
| * all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| * THE SOFTWARE. |
| */ |
| |
| #ifndef DLWRAP_H |
| #define DLWRAP_H |
| |
| #define _GNU_SOURCE |
| #include <dlfcn.h> |
| |
| /* Call the *real* dlopen. We have our own wrapper for dlopen that, of |
| * necessity must use claim the symbol 'dlopen'. So whenever anything |
| * internal needs to call the real, underlying dlopen function, the |
| * thing to call is dlwrap_real_dlopen. |
| */ |
| void * |
| dlwrap_real_dlopen(const char *filename, int flag); |
| |
| /* Perform a dlopen on the libfips library itself. |
| * |
| * Many places in fips need to lookup symbols within the libfips |
| * library itself, (and not in any other library). This function |
| * provides a reliable way to get a handle for performing such |
| * lookups. |
| * |
| * The returned handle can be passed to dlwrap_real_dlsym for the |
| * lookups. */ |
| void * |
| dlwrap_dlopen_libfips(void); |
| |
| /* Call the *real* dlsym. We have our own wrapper for dlsym that, of |
| * necessity must use claim the symbol 'dlsym'. So whenever anything |
| * internal needs to call the real, underlying dlysm function, the |
| * thing to call is dlwrap_real_dlsym. |
| */ |
| void * |
| dlwrap_real_dlsym(void *handle, const char *symbol); |
| |
| #define DEFER_TO_GL(library, func, name, args) \ |
| ({ \ |
| void *lib = dlwrap_real_dlopen(library, RTLD_LAZY | RTLD_LOCAL); \ |
| typeof(&func) real_func = dlwrap_real_dlsym(lib, name); \ |
| /* gcc extension -- func's return value is the return value of \ |
| * the statement. \ |
| */ \ |
| real_func args; \ |
| }) |
| |
| #endif |
| |