[Hamlib-developer] backend lib loading strategy.

[Frank S. <vk...@ix...>]

Hi,

In between the Olympic events I had some thoughts
on loading strategies, and share them below.

After browsing man page for dl_open etc... :-)

Reference Example.

<snip>
       Load the math library, and print the cosine of 2.0:
              #include <dlfcn.h>
 
              int main(int argc, char **argv) {
                  void *handle = dlopen ("/lib/libm.so", RTLD_LAZY);
                  double (*cosine)(double) = dlsym(handle, "cos");
                  printf ("%f\n", (*cosine)(2.0));
                  dlclose(handle);
              }
 <snip>

1. frontend should load appropriate backend lib
   at say, rig_init or similar.

2. multiple instances of same RIG type should not 
   cause multiple dl_open requests ??

3. Must have way of resolving symbol names for
   dlsym(handle, "symbol_name"); stuff.

  eg: for things like ..
  void *handle = dlopen ("libft747.so", RTLD_LAZY);
  int (*cmd_set_vfo)(vfo_t vfo)= dlsym(handle, "rig_set_vfo");
   (*cmd_set_vfo)(RIg_MAIN_VFO)

etc..	

4. A whole lot more to come, but you see the idea.

5. GNU libtool ??

6. Lots of other stuff to follow...

/Frank
        
-- 
Frank Singleton				VK3FCS

Email: victor kilo three foxtrot charlie sierra at ix dot netcom dot com