I'm trying to do some dynamic library loading in Rust. I'm getting a segmentation fault when passing a large Vec from a dynamically loaded library function. It's a basic function that creates a Vec<i32> of a specified size. If the Vec gets much bigger than 8MB, the program hits a segfault on OSX. I haven't had the same problem when running on linux, can anyone look at this and tell me if I'm doing something wrong here? I'm running this with:
$ cargo build --release
$ ./target/release/linkfoo
8281
[1] 84253 segmentation fault ./target/release/linkfoo
Cargo.toml
[package]
name = "linkfoo"
version = "0.1.0"
authors = ["Nate Mara <nathan.mara@kroger.com>"]
[dependencies]
libloading = "0.3.0"
[lib]
name = "foo"
crate-type = ["dylib"]
main.rs
extern crate libloading as lib;
fn main() {
let dylib = lib::Library::new("./target/release/libfoo.dylib").expect("Failed to load library");
let func = unsafe {
let wrapped_func: lib::Symbol<fn(&[i32]) -> Vec<i32>> = dylib.get(b"alloc")
.expect("Failed to load function");
wrapped_func.into_raw()
};
let args = vec![8182];
println!("{}", func(&args).len());
}
lib.rs
#[no_mangle]
pub fn alloc(args: &[i32]) -> Vec<i32> {
let size = args[0] as usize;
let mut mat = Vec::with_capacity(size);
for _ in 0..size {
mat.push(0);
}
mat
}
