title: Using dlopen() on an executable
body: <p>I need to call a function from another program.  If the other program were a library, I could simply use dlopen and dlsym to get a handle to the function.  Unfortunately, the other program is a Unix Executable, and building it as a library is not an option.  Trying dlopen() on the executable gives this error message:</p>
  
  <p><code>dlopen([...]/testprogram, 1): no suitable image found. Did find: 
  [...]/testprogram: can't map</code></p>
  
  <p>This isn't surprising, as dlopen is meant for use with libraries, not executables.  Is there any way to get dlopen and dlsym to work with executables?  If not, is there an alternative way of achieving the same thing?</p>