| 1 | /* System dependent definitions for run-time dynamic loading. |
|---|---|
| 2 | Copyright (C) 1996-2016 Free Software Foundation, Inc. |
| 3 | This file is part of the GNU C Library. |
| 4 | |
| 5 | The GNU C Library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2.1 of the License, or (at your option) any later version. |
| 9 | |
| 10 | The GNU C Library is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with the GNU C Library; if not, see |
| 17 | <http://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | #ifndef _DLFCN_H |
| 20 | # error "Never use <bits/dlfcn.h> directly; include <dlfcn.h> instead." |
| 21 | #endif |
| 22 | |
| 23 | /* The MODE argument to `dlopen' contains one of the following: */ |
| 24 | #define RTLD_LAZY 0x00001 /* Lazy function call binding. */ |
| 25 | #define RTLD_NOW 0x00002 /* Immediate function call binding. */ |
| 26 | #define RTLD_BINDING_MASK 0x3 /* Mask of binding time value. */ |
| 27 | #define RTLD_NOLOAD 0x00004 /* Do not load the object. */ |
| 28 | #define RTLD_DEEPBIND 0x00008 /* Use deep binding. */ |
| 29 | |
| 30 | /* If the following bit is set in the MODE argument to `dlopen', |
| 31 | the symbols of the loaded object and its dependencies are made |
| 32 | visible as if the object were linked directly into the program. */ |
| 33 | #define RTLD_GLOBAL 0x00100 |
| 34 | |
| 35 | /* Unix98 demands the following flag which is the inverse to RTLD_GLOBAL. |
| 36 | The implementation does this by default and so we can define the |
| 37 | value to zero. */ |
| 38 | #define RTLD_LOCAL 0 |
| 39 | |
| 40 | /* Do not delete object when closed. */ |
| 41 | #define RTLD_NODELETE 0x01000 |
| 42 | |
| 43 | #ifdef __USE_GNU |
| 44 | /* To support profiling of shared objects it is a good idea to call |
| 45 | the function found using `dlsym' using the following macro since |
| 46 | these calls do not use the PLT. But this would mean the dynamic |
| 47 | loader has no chance to find out when the function is called. The |
| 48 | macro applies the necessary magic so that profiling is possible. |
| 49 | Rewrite |
| 50 | foo = (*fctp) (arg1, arg2); |
| 51 | into |
| 52 | foo = DL_CALL_FCT (fctp, (arg1, arg2)); |
| 53 | */ |
| 54 | # define DL_CALL_FCT(fctp, args) \ |
| 55 | (_dl_mcount_wrapper_check ((void *) (fctp)), (*(fctp)) args) |
| 56 | |
| 57 | __BEGIN_DECLS |
| 58 | |
| 59 | /* This function calls the profiling functions. */ |
| 60 | extern void _dl_mcount_wrapper_check (void *__selfpc) __THROW; |
| 61 | |
| 62 | __END_DECLS |
| 63 | |
| 64 | #endif |
| 65 |