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    //! Global initialization and retrieval of command line arguments.
    //!
    //! On some platforms these are stored during runtime startup,
    //! and on some they are retrieved from the system on demand.

    #![allow(dead_code)] // runtime init functions not used during testing

    use ffi::OsString;
    use marker::PhantomData;
    use vec;

    /// One-time global initialization.
    pub unsafe fn init(argc: isize, argv: *const *const u8) { imp::init(argc, argv) }

    /// One-time global cleanup.
    pub unsafe fn cleanup() { imp::cleanup() }

    /// Returns the command line arguments
    pub fn args() -> Args {
        imp::args()
    }

    pub struct Args {
        iter: vec::IntoIter<OsString>,
        _dont_send_or_sync_me: PhantomData<*mut ()>,
    }

    impl Args {
        pub fn inner_debug(&self) -> &[OsString] {
            self.iter.as_slice()
        }
    }

    impl Iterator for Args {
        type Item = OsString;
        fn next(&mut self) -> Option<OsString> { self.iter.next() }
        fn size_hint(&self) -> (usize, Option<usize>) { self.iter.size_hint() }
    }

    impl ExactSizeIterator for Args {
        fn len(&self) -> usize { self.iter.len() }
    }

    impl DoubleEndedIterator for Args {
        fn next_back(&mut self) -> Option<OsString> { self.iter.next_back() }
    }

    #[cfg(any(target_os = "linux",
              target_os = "android",
              target_os = "freebsd",
              target_os = "dragonfly",
              target_os = "bitrig",
              target_os = "netbsd",
              target_os = "openbsd",
              target_os = "solaris",
              target_os = "emscripten",
              target_os = "haiku",
              target_os = "l4re",
              target_os = "fuchsia",
              target_os = "hermit"))]
    mod imp {
        use os::unix::prelude::*;
        use ptr;
        use ffi::{CStr, OsString};
        use marker::PhantomData;
        use libc;
        use super::Args;

        use sys_common::mutex::Mutex;

        static mut ARGC: isize = 0;
        static mut ARGV: *const *const u8 = ptr::null();
        // We never call `ENV_LOCK.init()`, so it is UB to attempt to
        // acquire this mutex reentrantly!
        static LOCK: Mutex = Mutex::new();

        pub unsafe fn init(argc: isize, argv: *const *const u8) {
            let _guard = LOCK.lock();
            ARGC = argc;
            ARGV = argv;
        }

        pub unsafe fn cleanup() {
            let _guard = LOCK.lock();
            ARGC = 0;
            ARGV = ptr::null();
        }

        pub fn args() -> Args {
            Args {
                iter: clone().into_iter(),
                _dont_send_or_sync_me: PhantomData
            }
        }

        fn clone() -> Vec<OsString> {
            unsafe {
                let _guard = LOCK.lock();
                (0..ARGC).map(|i| {
                    let cstr = CStr::from_ptr(*ARGV.offset(i) as *const libc::c_char);
                    OsStringExt::from_vec(cstr.to_bytes().to_vec())
                }).collect()
            }
        }
    }

    #[cfg(any(target_os = "macos",
              target_os = "ios"))]
    mod imp {
        use ffi::CStr;
        use marker::PhantomData;
        use libc;
        use super::Args;

        pub unsafe fn init(_argc: isize, _argv: *const *const u8) {
        }

        pub fn cleanup() {
        }

        #[cfg(target_os = "macos")]
        pub fn args() -> Args {
            use os::unix::prelude::*;
            extern {
                // These functions are in crt_externs.h.
                fn _NSGetArgc() -> *mut libc::c_int;
                fn _NSGetArgv() -> *mut *mut *mut libc::c_char;
            }

            let vec = unsafe {
                let (argc, argv) = (*_NSGetArgc() as isize,
                                    *_NSGetArgv() as *const *const libc::c_char);
                (0.. argc as isize).map(|i| {
                    let bytes = CStr::from_ptr(*argv.offset(i)).to_bytes().to_vec();
                    OsStringExt::from_vec(bytes)
                }).collect::<Vec<_>>()
            };
            Args {
                iter: vec.into_iter(),
                _dont_send_or_sync_me: PhantomData,
            }
        }

        // As _NSGetArgc and _NSGetArgv aren't mentioned in iOS docs
        // and use underscores in their names - they're most probably
        // are considered private and therefore should be avoided
        // Here is another way to get arguments using Objective C
        // runtime
        //
        // In general it looks like:
        // res = Vec::new()
        // let args = [[NSProcessInfo processInfo] arguments]
        // for i in (0..[args count])
        //      res.push([args objectAtIndex:i])
        // res
        #[cfg(target_os = "ios")]
        pub fn args() -> Args {
            use ffi::OsString;
            use mem;
            use str;

            extern {
                fn sel_registerName(name: *const libc::c_uchar) -> Sel;
                fn objc_getClass(class_name: *const libc::c_uchar) -> NsId;
            }

            #[cfg(target_arch="aarch64")]
            extern {
                fn objc_msgSend(obj: NsId, sel: Sel) -> NsId;
                #[link_name="objc_msgSend"]
                fn objc_msgSend_ul(obj: NsId, sel: Sel, i: libc::c_ulong) -> NsId;
            }

            #[cfg(not(target_arch="aarch64"))]
            extern {
                fn objc_msgSend(obj: NsId, sel: Sel, ...) -> NsId;
                #[link_name="objc_msgSend"]
                fn objc_msgSend_ul(obj: NsId, sel: Sel, ...) -> NsId;
            }

            type Sel = *const libc::c_void;
            type NsId = *const libc::c_void;

            let mut res = Vec::new();

            unsafe {
                let process_info_sel = sel_registerName("processInfo\0".as_ptr());
                let arguments_sel = sel_registerName("arguments\0".as_ptr());
                let utf8_sel = sel_registerName("UTF8String\0".as_ptr());
                let count_sel = sel_registerName("count\0".as_ptr());
                let object_at_sel = sel_registerName("objectAtIndex:\0".as_ptr());

                let klass = objc_getClass("NSProcessInfo\0".as_ptr());
                let info = objc_msgSend(klass, process_info_sel);
                let args = objc_msgSend(info, arguments_sel);

                let cnt: usize = mem::transmute(objc_msgSend(args, count_sel));
                for i in 0..cnt {
                    let tmp = objc_msgSend_ul(args, object_at_sel, i as libc::c_ulong);
                    let utf_c_str: *const libc::c_char =
                        mem::transmute(objc_msgSend(tmp, utf8_sel));
                    let bytes = CStr::from_ptr(utf_c_str).to_bytes();
                    res.push(OsString::from(str::from_utf8(bytes).unwrap()))
                }
            }

            Args { iter: res.into_iter(), _dont_send_or_sync_me: PhantomData }
        }
    }

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