projects / lttng-ust.git / blame
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|---|---|---|
| f02baefb MD |
1 | #ifndef _LTTNG_UST_DLFCN_H |
| 2 | #define _LTTNG_UST_DLFCN_H | |
| 3 | ||
| 4 | /* | |
| 5 | * lttng/ust-dlfcn.h | |
| 6 | * | |
| 7 | * Copyright 2014 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
| 8 | * | |
| 9 | * dlfcn.h compatibility layer. | |
| 10 | * | |
| 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: | |
| 17 | * | |
| 18 | * The above copyright notice and this permission notice shall be included in | |
| 19 | * all copies or substantial portions of the Software. | |
| 20 | * | |
| 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 | |
| 27 | * SOFTWARE. | |
| 28 | */ | |
| 29 | ||
| 30 | #ifdef _DLFCN_H | |
| 31 | #error "Please include lttng/ust-dlfcn.h before dlfcn.h." | |
| 32 | #endif /* _DLFCN_H */ | |
| 33 | ||
| 34 | /* | |
| 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. | |
| 39 | * | |
| 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. | |
| 44 | */ | |
| 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 | |
| 49 | #include <dlfcn.h> | |
| 50 | #undef dlerror | |
| 51 | #undef dlsym | |
| 52 | #undef dlclose | |
| 53 | #undef dlopen | |
| 54 | ||
| 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)); | |
| 39ec1582 | 59 | extern char *dlerror(void); |
| f02baefb MD |
60 | |
| 61 | #endif /* _LTTNG_UST_DLFCN_H */ |