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Questions tagged [dlopen]

POSIX function to dynamically load a library or binary into memory

685 questions
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dlopen with two shared libraries, exporting symbols

I have a linux shared library, foo.so, which is loaded from an executable using dlopen("foo.so", RTLD_NOW | RTLD_LOCAL). From foo.so I'd like to dlopen another library, bar.so, which references symbols defined in foo.so, but the linker fails to find…
mr grumpy
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python c extension, problems with dlopen on mac os

I've taken a library that is distributed as a binary lib (.a) and header, written some c++ code against it, and want to wrap the results up in a python module. I've done this here. The problem is that when importing this module on Mac OSX (I've…
Jason Sundram
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Dynamic Loading Without extern "C"

I'd like to use libdl to dynamically load C++ in general. The problem is identifying symbols at runtime that have been name mangled. As described here, one solution is to remove name mangling by using extern…
Praxeolitic
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dlopen vs linking overhead

Suppose I have a library - foo.so . When building my binary (which needs this library), I can either (1) link foo.so , or, (2) within the program source code, dlopen this library and then call functions provided by this library Is there any…
MK.
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dlopen() error image not found

I have software that first loads a .dylib lets call libFirst.dylib using the following command: void* handle = dlopen(path.c_str(), RTLD_LAZY | RTLD_GLOBAL); Later on inside a function from the loaded libFirst.dylib I attempt to load another .dylib…
Michael Wildermuth
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What is the usecase of RTLD_LAZY and RTLD_NOW in code

How can I differentiate between RTLD_LAZY and RTLD_NOW and when to use what in code?
wasnaz
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overriding @executable_path in a DLL loaded with dlopen()

Operating system is MacOS X, specifically 10.5 (Leopard) on a PowerPC G4, but I have the same problem on an x86 running 10.6. I am writing an application which dynamically loads a DLL. The DLL (let's call it foo.dylib) is part of another…
Thomas Pornin
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LD_PRELOAD doesn't affect dlopen() with RTLD_NOW

If I use a function from a shared library directly, i.e. by declaring it in my code and linking during compile time, LD_PRELOAD works fine. But if I use dlopen()/dlsym() instead LD_PRELOAD has no effect! The problem is that I want to debug a program…
sashoalm
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dlopen doesn't respect `RTLD_LOCAL`?

I have A.so, which links to a particular versioned libstdc++.so.6 at its own directory (via rpath set to $ORIGIN). If I dlopen A.so alone, it works fine. If I dlopen my system's libstdc++.so.6 (which is of different version) in RTLD_LOCAL mode, and…
colinfang
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How to do runtime binding based on CPU capabilities on linux

Is it possible to have a linux library (e.g. "libloader.so") load another library to resolve any external symbols? I've got a whole bunch of code that gets conditionally compiled for the SIMD level to be supported ( SSE2, AVX, AVX2 ). This works…
Mark Borgerding
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Main Program and Shared Library initializes same static variable in __static_initialization_and_destruction_0

Does anyone know why a library initialized within dlopen() would initialize a static variable owned by the main program. Both the main program and shared library have a copy of the static variable, but for some reason the shared library…
Paul
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dlopen a dynamic library from a static library, when the dynamic library uses symbols of the static one

This question is closely related to dlopen a dynamic library from a static library linux C++, but contains a further complication (and uses C++ instead of C): I have an application that links against a static library (.a) and that library uses the…
Johanna
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Creating a static C struct containing strings

I'm trying to create a dynamic library in Rust that exports a struct as a symbol that will be loaded into a C program via dlopen(). However, I'm was running into some segfaults when accessing the second string in the struct, so I made a small test…
chrippa
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When exactly is gcc __attribute__((constructor)) run?

Let's say I have an libA.so with GCC constructor. My program "program" depends on libA.so, so when I run it, libA.so gets opened and its constructor is executed. Now, I also have a module, libC.so, which also depends on libA. I run…
che
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Potential reasons dlopen could segfault?

What are some of the reasons dlopen could segfault besides the shared object not existing? In my case, I know the shared object exists, but when my program goes to load it using dlopen, it segfaults. I checked in my lib folder and the shared object…
user1496542
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