Loading library that makes use of libdl

[jonpryai]

Hi,
I am trying to dlopen() a library that in turns uses libdl to load some additional components. Currently rust-dlopen actually tries to load the system libdl which is then calling into the system linker. I would like to simply use rust-dlopen's implementation of the libdl calls. I'm not sure what the easiest way to go about that is.

Thanks,

Jon Pry

[weizhiao]

If you are using version 0.7.3 of rust-dlopen, the relocate_with interface can achieve this. Alternatively, a simpler approach is to use LD_PRELOAD to replace all dlopen-related symbols with those provided by rust-dlopen.

# Compile the library as a dynamic library
$ cargo build -r -p cdylib
# Compile test cases
$ cargo build -r -p dlopen-rs --example preload
# Replace libc implementations with ours
$ RUST_LOG=trace LD_PRELOAD=./target/release/libdlopen.so ./target/release/examples/preload

However, there are still some bugs in the main branch of rust-dlopen, and I don't have time to fix them at the moment, so it's better to use version 0.7.3 of rust-dlopen.