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    // Copyright 2012-2015 The Rust Project Developers. See the COPYRIGHT
    // file at the top-level directory of this distribution and at
    // http://rust-lang.org/COPYRIGHT.
    //
    // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
    // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
    // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
    // option. This file may not be copied, modified, or distributed
    // except according to those terms.

    //! Global storage for command line arguments
    //!
    //! The current incarnation of the Rust runtime expects for
    //! the processes `argc` and `argv` arguments to be stored
    //! in a globally-accessible location for use by the `os` module.
    //!
    //! Only valid to call on Linux. Mac and Windows use syscalls to
    //! discover the command line arguments.
    //!
    //! FIXME #7756: Would be nice for this to not exist.

    #![allow(dead_code)] // different code on OSX/linux/etc

    use vec::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() }

    /// Make a clone of the global arguments.
    pub fn clone() -> Option<Vec<Vec<u8>>> { imp::clone() }

    #[cfg(any(target_os = "linux",
              target_os = "android",
              target_os = "freebsd",
              target_os = "dragonfly",
              target_os = "bitrig",
              target_os = "netbsd",
              target_os = "openbsd"))]
    mod imp {
        use prelude::v1::*;

        use libc::c_char;
        use mem;
        use ffi::CStr;

        use sync::StaticMutex;

        static mut GLOBAL_ARGS_PTR: usize = 0;
        static LOCK: StaticMutex = StaticMutex::new();

        pub unsafe fn init(argc: isize, argv: *const *const u8) {
            let args = (0..argc).map(|i| {
                CStr::from_ptr(*argv.offset(i) as *const c_char).to_bytes().to_vec()
            }).collect();

            let _guard = LOCK.lock();
            let ptr = get_global_ptr();
            assert!((*ptr).is_none());
            (*ptr) = Some(box args);
        }

        pub unsafe fn cleanup() {
            let _guard = LOCK.lock();
            *get_global_ptr() = None;
        }

        pub fn clone() -> Option<Vec<Vec<u8>>> {
            let _guard = LOCK.lock();
            unsafe {
                let ptr = get_global_ptr();
                (*ptr).as_ref().map(|s| (**s).clone())
            }
        }

        fn get_global_ptr() -> *mut Option<Box<Vec<Vec<u8>>>> {
            unsafe { mem::transmute(&GLOBAL_ARGS_PTR) }
        }

    }

    #[cfg(any(target_os = "macos",
              target_os = "ios",
              target_os = "windows"))]
    mod imp {
        use vec::Vec;

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

        pub fn cleanup() {
        }

        pub fn clone() -> Option<Vec<Vec<u8>>> {
            panic!()
        }
    }

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