1/* Copyright © 2013, Intel Corporation
2 *
3 * Permission is hereby granted, free of charge, to any person obtaining a copy
4 * of this software and associated documentation files (the "Software"), to deal
5 * in the Software without restriction, including without limitation the rights
6 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
7 * copies of the Software, and to permit persons to whom the Software is
8 * furnished to do so, subject to the following conditions:
9 *
10 * The above copyright notice and this permission notice shall be included in
11 * all copies or substantial portions of the Software.
12 *
13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
16 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
17 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
18 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
19 * THE SOFTWARE.
20 */
21
22#ifndef DLWRAP_H
23#define DLWRAP_H
24
25#define _GNU_SOURCE
26#include <dlfcn.h>
27
28/* Call the *real* dlopen. We have our own wrapper for dlopen that, of
29 * necessity must use claim the symbol 'dlopen'. So whenever anything
30 * internal needs to call the real, underlying dlopen function, the
31 * thing to call is dlwrap_real_dlopen.
32 */
33void *
34dlwrap_real_dlopen(const char *filename, int flag);
35
36/* Perform a dlopen on the libfips library itself.
37 *
38 * Many places in fips need to lookup symbols within the libfips
39 * library itself, (and not in any other library). This function
40 * provides a reliable way to get a handle for performing such
41 * lookups.
42 *
43 * The returned handle can be passed to dlwrap_real_dlsym for the
44 * lookups. */
45void *
46dlwrap_dlopen_libfips(void);
47
48/* Call the *real* dlsym. We have our own wrapper for dlsym that, of
49 * necessity must use claim the symbol 'dlsym'. So whenever anything
50 * internal needs to call the real, underlying dlysm function, the
51 * thing to call is dlwrap_real_dlsym.
52 */
53void *
54dlwrap_real_dlsym(void *handle, const char *symbol);
55
56#define DEFER_TO_GL(library, func, name, args) \
57({ \
58 void *lib = dlwrap_real_dlopen(library, RTLD_LAZY | RTLD_LOCAL); \
59 typeof(&func) real_func = dlwrap_real_dlsym(lib, name); \
60 /* gcc extension -- func's return value is the return value of \
61 * the statement. \
62 */ \
63 real_func args; \
64})
65
66#endif
67
68

source code of gtk/subprojects/libepoxy/test/dlwrap.h