| 1 | /* System dependent definitions for run-time dynamic loading. |
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| 2 | Copyright (C) 1996-2022 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #ifndef _DLFCN_H |
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| 20 | # error "Never use <bits/dlfcn.h> directly; include <dlfcn.h> instead." |
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| 21 | #endif |
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| 22 | |
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| 23 | /* The MODE argument to `dlopen' contains one of the following: */ |
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| 24 | #define RTLD_LAZY 0x00001 /* Lazy function call binding. */ |
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| 25 | #define RTLD_NOW 0x00002 /* Immediate function call binding. */ |
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| 26 | #define RTLD_BINDING_MASK 0x3 /* Mask of binding time value. */ |
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| 27 | #define RTLD_NOLOAD 0x00004 /* Do not load the object. */ |
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| 28 | #define RTLD_DEEPBIND 0x00008 /* Use deep binding. */ |
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| 29 | |
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| 30 | /* If the following bit is set in the MODE argument to `dlopen', |
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| 31 | the symbols of the loaded object and its dependencies are made |
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| 32 | visible as if the object were linked directly into the program. */ |
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| 33 | #define RTLD_GLOBAL 0x00100 |
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| 34 | |
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| 35 | /* Unix98 demands the following flag which is the inverse to RTLD_GLOBAL. |
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| 36 | The implementation does this by default and so we can define the |
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| 37 | value to zero. */ |
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| 38 | #define RTLD_LOCAL 0 |
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| 39 | |
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| 40 | /* Do not delete object when closed. */ |
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| 41 | #define RTLD_NODELETE 0x01000 |
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| 42 | |
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| 43 | #ifdef __USE_GNU |
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| 44 | /* To support profiling of shared objects it is a good idea to call |
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| 45 | the function found using `dlsym' using the following macro since |
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| 46 | these calls do not use the PLT. But this would mean the dynamic |
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| 47 | loader has no chance to find out when the function is called. The |
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| 48 | macro applies the necessary magic so that profiling is possible. |
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| 49 | Rewrite |
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| 50 | foo = (*fctp) (arg1, arg2); |
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| 51 | into |
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| 52 | foo = DL_CALL_FCT (fctp, (arg1, arg2)); |
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| 53 | */ |
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| 54 | # define DL_CALL_FCT(fctp, args) \ |
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| 55 | (_dl_mcount_wrapper_check ((void *) (fctp)), (*(fctp)) args) |
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| 56 | |
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| 57 | __BEGIN_DECLS |
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| 58 | |
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| 59 | /* This function calls the profiling functions. */ |
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| 60 | extern void _dl_mcount_wrapper_check (void *__selfpc) __THROW; |
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| 61 | |
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| 62 | __END_DECLS |
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| 63 | |
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| 64 | #endif |
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| 65 | |
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