1 #ifndef _LTTNG_UST_DLFCN_H
2 #define _LTTNG_UST_DLFCN_H
7 * Copyright 2014 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 * dlfcn.h compatibility layer.
11 * Permission is hereby granted, free of charge, to any person obtaining a copy
12 * of this software and associated documentation files (the "Software"), to deal
13 * in the Software without restriction, including without limitation the rights
14 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
15 * copies of the Software, and to permit persons to whom the Software is
16 * furnished to do so, subject to the following conditions:
18 * The above copyright notice and this permission notice shall be included in
19 * all copies or substantial portions of the Software.
21 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
22 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
23 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
24 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
25 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
26 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31 #error "Please include lttng/ust-dlfcn.h before dlfcn.h."
35 * glibc declares dlsym() and dlerror() with __attribute__((leaf)) (see
36 * THROW annotation). Unfortunately, this is not in sync with reality,
37 * as those functions call the memory allocator. Work-around this glibc
38 * bug by declaring our own symbols.
40 * There has been a similar issue for dlopen() and dlclose(), as
41 * constructors and destructors are called from these functions, so they
42 * are clearly non-leaf. Work-around the issue for those too for older
43 * glibc where these have not been fixed.
45 #define dlopen glibc_dlopen_proto_lies_about_leafness
46 #define dlclose glibc_dlclose_proto_lies_about_leafness
47 #define dlsym glibc_dlsym_proto_lies_about_leafness
48 #define dlerror glibc_dlerror_proto_lies_about_leafness
55 extern void *dlopen(__const
char *__file
, int __mode
);
56 extern int dlclose(void *__handle
) __nonnull ((1));
57 extern void *dlsym(void *__restrict __handle
,
58 __const
char *__restrict __name
) __nonnull ((2));
59 extern char *dlerror(void);
61 #endif /* _LTTNG_UST_DLFCN_H */
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