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Questions tagged [dynamic-library]

Compiled binaries capable to be loaded in the process address space in runtime.

Dynamic Libraries are compiled binaries capable of being loaded/unloaded into/from the process address space at runtime.

In the Unix world, they are called shared libraies; in the Windows world, they are known as DLLs (dynamically-loadable libraries).

They can be loaded simultaneously into multiple processes, saving RAM and disk space.

Their file format is similar to, or even the same as, that of binary executables.

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Static library & Dynamic library - more C++ fun

Let's say I want to create a dynamic library dynamic.so, but my code references a function that exists in some other, static library static.a. Naturally, if I compile and link with g++ and the -sharedoption, dynamic.so will expect the referenced…
Thomas
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Not Understanding Why I am Getting a Segmentation Fault

When I pass an array into a function in a dynamic library with the signature: void itoa(int n, char s[]); and calling it from my main function: int main(int argc, char *argv[]) { if (argc > 1) { char *arg = argv[1]; …
Matthew Hoggan
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What happens when a shared object is loaded

I have written a pam module using Golang and C, similar to https://github.com/uber/pam-ussh. I am noticing an issue with the signal handler of Golang even though my PAM module is never called to authenticate. In strace output, I can see that all…
KeepAsking
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What is the C++ way of interpreting the void* returned by dlsym as a pointer-to-function?

Assume a dynamic library exports a function, e.g. of type void(), named foo. A client code could then make use of it like in the following snippet (assuming foo is exposed via extern "C" void foo(); for simplicity) #include "Foo.hpp" // defines the…
Enlico
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Why should I need libprofiler.so.0

I am using google prof tools, and link my app with -lprofiler, but when I run this program: error while loading shared libraries: libprofiler.so.0: cannot open shared object file: No such file or directory on the contrary, I link with -ltcmalloc…
Shawn
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Dynamic linking: offset value used to index relocation table

I'm trying to understand dynamic linking process...the call to a library function (let's call it func) passes through the plt table. I know when the symbol is not yet relocated the call of the function passes from plt table which contains an…
MirkoBanchi
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Java on macOS: "cannot open JVM dynamic library" despite the file exists

when starting a java program I get the following error message: Cannot open JVM dynamic library Dynamic library location: /Library/Java/JavaVirtualMachines/amazon-corretto-17.jdk/Contents/Home/lib/libjli.dylib But the file exists: -rw-r--r-- 1…
tab
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How do you detect the size of a dynamic library(shared object) in the current process?

We could use GetModuleInformation to get the information of a loaded dynamic library on Windows platforms, including its base address and size. And, GetModuleHandleEx can take an address as the input and returns the module's handle. So basically,…
amanjiang
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Unable to load dynamic library in a .NET app on Linux

Unable to load dynamic library on Linux I built a project on Mac OS and the output was a libmylibrary.so and libmylibrary.dylib files. I copied the .dylib into a Visual Studio Console project and was able to load and invoke the functions of the…
Sahil Khanna
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On Mac, is it possible to create two shared lib that depends on each other?

On Linux I can create two coupled shared library lib1 lib2. Since linking happens on a latter stage, so it is fine. But on Mac, dylib are "linked". which means that creating lib1 would requires lib2 to exists first, which then requires lib1 to…
somebody4
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Access dynamic symbol with hidden visibility attribute using `dlsym`

I have a dynamically linked library that defines __attribute__((visibility("hidden"))) symbol which I need to access. Here is a simplified code shared.c __attribute__((visibility("hidden"))) int hidden_sym[12]; int …
haxscramper
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Xcode: How do I build my .app project also as a Shared Library?

First I am using Xcode 3.2.5 on a MAC OS X 10.6 I have an Cocoa Application project that builds and runs fine. I have some functions in this project that I am exporting out using: #define CORE_EXPORT __attribute__ ((visibility ("default"))) extern…
Michael Wildermuth
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Why dynamic libraries source code should be compiled with position-independent code?

I'm very confused about position-independent code and its usage for dynamic libraries. I found this good example about -fPIC option of GCC: GCC -fPIC option and I figure out how it works. However, I'm struggling to understand why dynamic libraries…
peppone
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`undefined reference` error occurred when linking dynamic c++ lib with CGO

I use dynamic libaray written by c++ in my Go code as following: /* #cgo CFLAGS: -I include #cgo LDFLAGS: -L lib -ldemo #include "demo.h" */ import "C" func main() { C.demo() // demo function in c++ library } The libdemo.so library depends on…
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undefined symbol: _ZTI13my_plugin_api during Boost::DLL tutorial

I have problem running the very first example of Boost::DLL tutorial. At some point I just copied code from the git repo to be sure I didn't do any mistake. Didn't help. Both executable and shared lib compile and link properly. However, I still get…
Lehu
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