shared-libraries

I am using a dev system where I have to specify the lib name when accessing a function inside it. I've used functions like open() before, and somehow found out that they're in libc.so. Now I want to use lstat(), but it appears that this one is not in libc. Sadly, the man pages I looked at do not document the location of the functions. So, two questions: Can someone tell which lib hosts lstat? How can I generally find this out? Other than using grep "name" on all files in the lib folder, I mean. Build a simple testcase in C, compile it and run 'ldd -r' on it to check what libs are loaded. If

Can I get list of all functions names from a shared library (Linux only) programmatically when I am using dl_open() ? I want something like this: std::vector<std::string> list_all_functions(void *dl) { //... what can I do here? } int main() { void * dl = dl_open("./mylib.so", RTLD_NOW); auto functions = list_all_functions(dl); //... dl_close(dl); return 0; } Example library (mylib.so) Header (.h): extern "C" { int sum (int a, int b); } Source (.c): int sum (int a, int b) { return a + b; } Dirty hack that I know: use nm or objdump utility There is no libc function to do that. However, you can

I want to use same library functions (i.e. OpenSSL library ) in two different programs in C for computation. How can I make sure that both program use a common library , means only one copy of library is loaded into shared main memory and both program access the library from that memory location for computation? For example, when 1st program access the library for computation it is loaded into cache from main memory and when the 2nd program wants to access it later , it will access the data from cache ( already loaded by 1st program), not from main memory again. I am using GCC under Linux. Any

I would like to modify the linux kernel. I would like to use functions from a shared library (an .so file) in file kernel/panic.c . Unfortunately I don't know how to compile it. When I put it in to the Makefile I receive the following error: ld: attempted static link of dynamic object . Is there a way to put the shared library file to the Linux kernel or do I need to recompile my library to gain an object file. It is not possible to link shared library into kernel code ( ELF shared objects are a user-space thing, using ld-linux(8) ...) You should consider making a kernel module (and use

I write a simple llvm plugin pass that requires opt to load xxx.so file and run a ModulePass. The strange thing is that when I use deb package opt (e.g., from apt-get , let's call it opt-3.7 ), the plugin works fine (the drawback is that it is a Release build); however when I use the opt I build myself (simplify call it opt ), it frequently complains: Error opening 'xxx.so': xxx.so: undefined symbol: _ZNK4llvm12FunctionPass17createPrinterPassERNS_11raw_ostreamERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE using c++filt I know that opt cannot find llvm::FunctionPass::createPrinterPass