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    // Copyright 2014-2015 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.

    use io;
    use intrinsics;
    use ffi::CStr;
    use libc;
    use sys::backtrace::BacktraceContext;
    use sys_common::backtrace::Frame;

    pub fn resolve_symname<F>(frame: Frame,
                              callback: F,
                              _: &BacktraceContext) -> io::Result<()>
        where F: FnOnce(Option<&str>) -> io::Result<()>
    {
        unsafe {
            let mut info: Dl_info = intrinsics::init();
            let symname = if dladdr(frame.exact_position as *mut _, &mut info) == 0 ||
                             info.dli_sname.is_null() {
                None
            } else {
                CStr::from_ptr(info.dli_sname).to_str().ok()
            };
            callback(symname)
        }
    }

    #[repr(C)]
    struct Dl_info {
        dli_fname: *const libc::c_char,
        dli_fbase: *mut libc::c_void,
        dli_sname: *const libc::c_char,
        dli_saddr: *mut libc::c_void,
    }

    extern {
        fn dladdr(addr: *const libc::c_void, info: *mut Dl_info) -> libc::c_int;
    }

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