Dec 22, 2010 · What you need is nm and its -D option: U atanf. U calloc. Exported sumbols are indicated by a T. Required symbols that must be loaded from other shared objects have a U. Note that the symbol table does not include just functions, but exported variables as well. See the nm manual page for more information.

Aug 24, 2016 · This way one can search the library that defines the symbol_name and not just uses it. -D allows to search only in dynamic libraries (.so). But is seems the ultimate way to scan for library that defines(+) or not(-) a symbol is scanelf :

Feb 18, 2017 · Recently, we wanted to see if a certain function call was available in a shared library (.so). To do so we used the command nm. nm lists symbols from object files. We used the command nm -D /libs/mylib.so.1. The parameter -D (or --dynamic) displays the dynamic symbols rather than the normal symbols. (This is only meaningful for dynamic objects ...

Oct 27, 2015 · How to retrieve function name from function address using link register (like backtrace_symbol) in linux

Mar 18, 2024 · We can use the readelf command with the -s flag to view exported symbols: Num: Value Size Type Bind Vis Ndx Name. 0: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND . 1: 0000000000000000 0 NOTYPE WEAK DEFAULT UND _ITM_deregisterT[...] 2: 0000000000000000 0 FUNC GLOBAL DEFAULT UND puts@GLIBC_2.2.5 (2)

Sep 30, 2010 · The part you are looking for is the symbol table, where each symbol (function, variable) is mapped to its address. Shared libraries keep their global symbols in a section called .dynsym. What you are looking for are symbols of the type function and a global binding in this section. readelf --syms ./libfoo.so will give you a output of the symbols.

Jan 25, 2022 · How can I find which symbols(functions/variables) are used in this project from a particular shared library? To begin I ran the following command on my binary: readelf -d binaryName | grep -i "Shared library"

May 1, 2020 · Picking out the global function symbols. Looking at the symbol names in the readelf output, you could suspect that not all of them are library functions, and you’d be right. Only the symbols with type FUNC and bind GLOBAL, i.e. global functions, are external library functions.

Dec 11, 2018 · I'm creating a dotnet core project and would like to call into some linux system functions using P/Invoke. How do I find which .so file does the desired functionality reside in? Eg. to use getpid, I need to add this import-[DllImport("libc.so.6")]

Oct 2, 2018 · Use objdump -tT ${FILE} or readelf -s ${FILE}. $ objdump -T /lib/x86_64-linux-gnu/libz.so.1 /lib/x86_64-linux-gnu/libz.so.1: file format elf64-x86-64 DYNAMIC SYMBOL TABLE: 0000000000001c58 l d .init 0000000000000000 .init 0000000000000000 DF *UND* 0000000000000000 GLIBC_2.3.4 __snprintf_chk 0000000000000000 DF *UND* 0000000000000000 GLIBC_2.2.5 ...