You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: profiling.rs
    path of file: ./repos/databend/src/common/base/src/mem_allocator
    
    the code of the file until where you have to start completion: // Copyright 2021 Datafuse Labs
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the Li
    
pub fn dump_profile(tmp_file_path: &str) -> Result<Vec<u8>, Box<dyn Error>> {
    // precheck
    if !is_prof_enabled()? {
        return Err("opt.prof is not ON,
                   please start the application with proper MALLOC env.
                   e.g.  MALLOC_CONF=prof:true "
            .into());
    }

    let mut bytes = CString::new(tmp_file_path)?.into_bytes_with_nul();
    let ptr = bytes.as_mut_ptr() as *mut c_char;
    unsafe {
        tikv_jemalloc_ctl::raw::write(PROF_DUMP, ptr).map_err(|e| {
            format!(
                "dump Jemalloc prof to path {}: failure: {}",
                tmp_file_path, e
            )
        })?
    }
    let mut f = File::open(tmp_file_path)?;
    let mut buf = Vec::new();
    f.read_to_end(&mut buf)?;
    Ok(buf)
}