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/* 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
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