45 lines
1.3 KiB
C
45 lines
1.3 KiB
C
/*
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* Copyright (c) 2006-2024 RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2010-11-17 yi.qiu first version
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*/
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#include <rtthread.h>
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#include <rtm.h>
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#include "dlmodule.h"
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/**
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* @brief look up the address of a symbol in a dynamically loaded shared library.
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*
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* @param handle the handle returned by dlopen() when the library was previously loaded.
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* @param symbol A string containing the name of the symbol to locate.
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* @return void* On success, it returns a pointer to the symbol. Otherwise, it returns RT_NULL.
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*
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* @note This function is an API of POSIX standard, which is commonly used in conjunction with dlopen() to retrieve function pointers from shared libraries.
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* the input symbol name, which can be the name of a function or variable, is compared with each symbol
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* in the module symbol table. if the same symbol is found, return its address.
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*/
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void* dlsym(void *handle, const char* symbol)
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{
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int i;
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struct rt_dlmodule *module;
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RT_ASSERT(handle != RT_NULL);
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module = (struct rt_dlmodule *)handle;
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for(i=0; i<module->nsym; i++)
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{
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if (rt_strcmp(module->symtab[i].name, symbol) == 0)
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return (void*)module->symtab[i].addr;
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}
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return RT_NULL;
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}
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RTM_EXPORT(dlsym)
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