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Questions tagged [dlopen]

POSIX function to dynamically load a library or binary into memory

685 questions
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Memory leak reported by valgrind in dlopen?

I've been debugging some app lately with valgrind, and I'm getting very weird reports from dlopen. ==1987== 32 bytes in 1 blocks are still reachable in loss record 1 of 2 ==1987== at 0x4C24477: calloc (vg_replace_malloc.c:418) ==1987== by…
Anteru
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Error loading psycopg2 module: Library not loaded: libpq.5.dylib

I am trying to run a Django project with Postgres database. I use Postgres 13.4 installed via postgressapp (UNIVERSAL with all currently supported versions) and python 3.9 (in venv). I work on Mac with Apple M1 chip, macOS Big Sur. I faced the…
kokserek
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library path when dynamically loaded?

How can I get the path of the shared library from within the library itself? In other words, let's say that library X is loaded using dlopen(), how can I get access to the path that was used to load the said library from within the library…
jldupont
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Cannot load any more object with static TLS

I have an application that use dlopen() to load additional modules. The application and modules are built on Ubuntu 12.04 x86_64 using gcc 4.6 but for i386 arch. The binaries are then copied to another machine with exactly same OS and work…
queen3
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Get functions names in a shared library programmatically

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 list_all_functions(void *dl) { //... what can I do here? } int main() { …
Alex Bar
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using std::thread in a library loaded with dlopen leads to a sigsev

I recently discovered a strange behaviour using std::thread and dlopen. Basically, when I execute a std::thread in a library which is loaded using dlopen I receive a sigsev. The library itself is linked against pthread, the executable that calls…
A. Gocht
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How would a loaded library function call a symbol in the main application?

When loaded a shared library is opened via the function dlopen(), is there a way for it to call functions in main program?
Nikron
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shared object can't find symbols in main binary, C++

I'm experimenting with making a kind of plugin architecture for a program I wrote, and at my first attempt I'm having a problem. Is it possible to access symbols from the main executable from within the shared object? I thought the following would…
cheshirekow
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Casting when using dlsym()

I'm using dlsym() in C and I have a question whether the return value of dlsym() should be explicitly cast or if it is implicitly cast correctly. Here is the function: double (*(compile)(void))(double x, double y) { if (system("scan-build clang…
lord.garbage
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Error: dlopen() Library not loaded Reason: image not found

I am a newbie in this field. My laptop is Macbook air, Software: OS X 10.8.5 (12F45). I am running a code which gives me the following error: dlopen(/Users/ramesh/offline/build_icerec/lib/icecube/phys_services.so, 2): Library not loaded:…
Ramesh
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Using dlopen, how can I cope with changes to the library file I have loaded?

I have a program written in C++ which uses dlopen to load a dynamic library (Linux, i386, .so). When the library file is subsequently modified, my program tends to crash. This is understandable, since presumably the file is simply mapped into…
kdt
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how to call function in executable from my library?

I have an executable and a dynamic library (.so). The library exports some symbols and executable calls it successfully. But I want to make possible to library call executable's functions. I've tried to do following in executable: //test extern "C"…
milo
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dynamic_cast fails when used with dlopen/dlsym

Intro Let me apologise upfront for the long question. It is as short as I could make it, which is, unfortunately, not very short. Setup I have defined two interfaces, A and B: class A // An interface { public: virtual ~A() {} virtual void…
Kees-Jan
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linux dlopen: can a library be "notified" when it is loaded?

Is there a way for a shared library to be "notified" when it is loaded? In other words, let's say I use dlopen on a shared library, is there a function that is automatically called (if present) on the shared library (e.g. main?)
jldupont
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dlopen() search path

is there a way to find out programmatically which paths are searched by dlopen() for shared objects? I always thought dlopen() would only look in /lib and /usr/lib but now I've seen that on Linux Mint several core components like libglib-2.0.so are…
user1055225
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