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    #![allow(
        clippy::missing_safety_doc,
        clippy::unreadable_literal,
        dead_code,
        non_camel_case_types,
        non_snake_case,
        non_upper_case_globals,
        overflowing_literals,
        unused_imports
    )]
    #![doc(html_root_url = "https://docs.rs/openssl-sys/0.9")]
    #![recursion_limit = "128"] // configure fixed limit across all rust versions

    extern crate libc;

    use libc::*;

    pub use aes::*;
    pub use asn1::*;
    pub use bio::*;
    pub use bn::*;
    pub use cms::*;
    pub use conf::*;
    pub use crypto::*;
    pub use dh::*;
    pub use dsa::*;
    pub use dtls1::*;
    pub use ec::*;
    pub use err::*;
    pub use evp::*;
    pub use hmac::*;
    pub use obj_mac::*;
    pub use object::*;
    pub use ocsp::*;
    pub use ossl_typ::*;
    pub use pem::*;
    pub use pkcs12::*;
    pub use pkcs7::*;
    pub use rand::*;
    pub use rsa::*;
    pub use safestack::*;
    pub use sha::*;
    pub use srtp::*;
    pub use ssl::*;
    pub use ssl3::*;
    pub use stack::*;
    pub use tls1::*;
    pub use x509::*;
    pub use x509_vfy::*;
    pub use x509v3::*;

    #[macro_use]
    mod macros;

    mod aes;
    mod asn1;
    mod bio;
    mod bn;
    mod cms;
    mod conf;
    mod crypto;
    mod dh;
    mod dsa;
    mod dtls1;
    mod ec;
    mod err;
    mod evp;
    mod hmac;
    mod obj_mac;
    mod object;
    mod ocsp;
    mod ossl_typ;
    mod pem;
    mod pkcs12;
    mod pkcs7;
    mod rand;
    mod rsa;
    mod safestack;
    mod sha;
    mod srtp;
    mod ssl;
    mod ssl3;
    mod stack;
    mod tls1;
    mod x509;
    mod x509_vfy;
    mod x509v3;

    // FIXME remove
    pub type PasswordCallback = unsafe extern "C" fn(
        buf: *mut c_char,
        size: c_int,
        rwflag: c_int,
        user_data: *mut c_void,
    ) -> c_int;

    #[cfg(ossl110)]
    pub fn init() {
        use std::ptr;
        use std::sync::Once;

        // explicitly initialize to work around https://github.com/openssl/openssl/issues/3505
        static INIT: Once = Once::new();

        #[cfg(not(ossl111b))]
        let init_options = OPENSSL_INIT_LOAD_SSL_STRINGS;
        #[cfg(ossl111b)]
        let init_options = OPENSSL_INIT_LOAD_SSL_STRINGS | OPENSSL_INIT_NO_ATEXIT;

        INIT.call_once(|| unsafe {
            OPENSSL_init_ssl(init_options, ptr::null_mut());
        })
    }

    #[cfg(not(ossl110))]
    pub fn init() {
        use std::io::{self, Write};
        use std::mem;
        use std::process;
        use std::sync::{Mutex, MutexGuard, Once};

        static mut MUTEXES: *mut Vec<Mutex<()>> = 0 as *mut Vec<Mutex<()>>;
        static mut GUARDS: *mut Vec<Option<MutexGuard<'static, ()>>> =
            0 as *mut Vec<Option<MutexGuard<'static, ()>>>;

        unsafe extern "C" fn locking_function(
            mode: c_int,
            n: c_int,
            _file: *const c_char,
            _line: c_int,
        ) {
            let mutex = &(*MUTEXES)[n as usize];

            if mode & ::CRYPTO_LOCK != 0 {
                (*GUARDS)[n as usize] = Some(mutex.lock().unwrap());
            } else {
                if let None = (*GUARDS)[n as usize].take() {
                    let _ = writeln!(
                        io::stderr(),
                        "BUG: rust-openssl lock {} already unlocked, aborting",
                        n
                    );
                    process::abort();
                }
            }
        }

        cfg_if! {
            if #[cfg(unix)] {
                fn set_id_callback() {
                    unsafe extern "C" fn thread_id() -> c_ulong {
                        ::libc::pthread_self() as c_ulong
                    }

                    unsafe {
                        CRYPTO_set_id_callback(thread_id);
                    }
                }
            } else {
                fn set_id_callback() {}
            }
        }

        static INIT: Once = Once::new();

        INIT.call_once(|| unsafe {
            SSL_library_init();
            SSL_load_error_strings();
            OPENSSL_add_all_algorithms_noconf();

            let num_locks = ::CRYPTO_num_locks();
            let mut mutexes = Box::new(Vec::new());
            for _ in 0..num_locks {
                mutexes.push(Mutex::new(()));
            }
            MUTEXES = mem::transmute(mutexes);
            let guards: Box<Vec<Option<MutexGuard<()>>>> =
                Box::new((0..num_locks).map(|_| None).collect());
            GUARDS = mem::transmute(guards);

            CRYPTO_set_locking_callback(locking_function);
            set_id_callback();
        })
    }