Adding Horizontal lines before and after listings frame

I used the package tcolorbox to obtain the lines. You can modify the options of the environment tmpbox to suit your needs. There is one problem though; I don't think it is possible to define a new environment that puts together the tmpbox and the lstlisting. So you have to call tmpbox each time explicitly.

documentclass[11pt, a4paper]{article}
usepackage{geometry}
usepackage{tikz}
usetikzlibrary{calc}
usepackage{tcolorbox}
tcbuselibrary{skins,breakable}

newenvironment{tmpbox}{%
  tcolorbox[%
  empty,
  parbox=false,
  noparskip,
  enhanced,
  breakable,
  frame hidden,
  boxrule=0pt,
  colback=white,
  left=-.5ex, % right=-4pt,
  before skip=.1ex plus 2pt,
  after skip=1ex plus 2pt,
  overlay unbroken and last={%
    draw ($(frame.north west)+(0, -6ex)$)
    -- +(1textwidth, 0);
    draw ($(frame.south west)+(0, 2ex)$)
    -- +(1textwidth, 0);    
  }]
}{endtcolorbox}

usepackage{listings}
lstdefinestyle{CEE}{%
  frame=l, language=C, numbers=left, numbersep=1em, xleftmargin=2em
}

usepackage{lipsum}

begin{document}
begin{center}largebfseries
  Adding horizontal lines about listings
end{center}


% See verb|https://en.wikibooks.org/wiki/LaTeX/Source_Code_Listings|.

lipsum[1]

begin{tmpbox}
  begin{lstlisting}[style=CEE, caption={Hello world with hlines}]
  #include <stdio.h>
  int main(int argc, char *argv[])
  {
    printf("Hello worldn");
    return 0;
  }
end{lstlisting}
end{tmpbox}

lipsum[3]

begin{lstlisting}[style=CEE, caption={Hello world}]
  #include <stdio.h>
  int main(int argc, char *argv[])
  {
    printf("Hello worldn");
    return 0;
  }
end{lstlisting}

lipsum[4]
end{document}