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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;
}