intercepting readlink hangs when used on rustc

[sarvi]

I took the readlink intercept example and tried it rustc

LD_PRELOAD=examples/readlinkspy/target/debug/libreadlinkspy.so rustc And it hangs. More details here https://users.rust-lang.org/t/intercepting-libc-readlink-with-a-rust-ld-preload-program-hangs-when-applying-to-cargo-build/48057/5

On debugging, it looks like its because of the recursionn refered to below. This seems to suggest, that the code below addresses that. Bbut it doesnt seem to be in my case. Am I missing something?

I see the following comment in the redhook code.

/* Some Rust library functionality (e.g., jemalloc) initializes
 * lazily, after the hooking library has inserted itself into the call
 * path. If the initialization uses any hooked functions, this will lead
 * to an infinite loop. Work around this by running some initialization
 * code in a static constructor, and bypassing all hooks until it has
 * completed. */

static INIT_STATE: atomic::AtomicBool = atomic::AtomicBool::new(false);

pub fn initialized() -> bool {
    INIT_STATE.load(atomic::Ordering::SeqCst)
}

extern "C" fn initialize() {
    Box::new(0u8);
    INIT_STATE.store(true, atomic::Ordering::SeqCst);
}

/* Rust doesn't directly expose __attribute__((constructor)), but this
 * is how GNU implements it. */
 #[link_section = ".init_array"]
 pub static INITIALIZE_CTOR: extern "C" fn() = ::initialize;