The most surprising thing about dynamic library loading is that it’s not a magical, instantaneous event; it’s a series of explicit requests and responses between processes and the dynamic linker.
Let’s watch it happen. Imagine you have a simple C program, main.c:
#include <stdio.h>
#include <dlfcn.h>
int main() {
void *handle = dlopen("libmylib.so", RTLD_LAZY);
if (!handle) {
fprintf(stderr, "Cannot open library: %s\n", dlerror());
return 1;
}
printf("Library loaded successfully!\n");
dlclose(handle);
return 0;
}
And a shared library, mylib.c:
#include <stdio.h>
void my_function() {
printf("Hello from mylib!\n");
}
Compile them:
gcc -shared -fPIC mylib.c -o libmylib.so
gcc main.c -o main -ldl
Now, let’s trace the dlopen call using strace. We want to see the system calls that dlopen makes, specifically focusing on file operations and the dynamic linker (ld.so).
strace -s 1024 -f -e 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