macos query process info wrong

[kekeimiku]

fn main() {
    let pid = std::env::args().nth(1).unwrap().parse().unwrap();
    let maps = proc_maps::get_process_maps(pid).unwrap();
    for map in maps.into_iter().filter(|x| !x.is_write()) {
        println!(
            "{:x}-{:x} {:?}",
            map.start(),
            map.size() + map.start(),
            map.filename()
        )
    }
}

In the vmmap command, the filename obtained should be None.

proc-maps output:

...
108c80000-108cc0000 Some("/Users/****/UnityFramework")
...

vmmap command output:

...
VM_ALLOCATE                 108c80000-108cc0000    [  256K     0K     0K     0K] ---/rwx SM=NUL  
...

But for very small processes, such as print helloworld , proc-maps can get the filename correctly.