osLinux.c

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/** \file    osLinux.c

  \brief Linux specific code

******************************************************************************/

#include "os.h"
#include "dlfcn.h"      // for dynamic linkage: dlopen, etc.

/**AutomaticStart*************************************************************/

/*---------------------------------------------------------------------------*/
/* Static function prototypes                                                */
/*---------------------------------------------------------------------------*/

static void do_one_thing (void *arg_in);

/**AutomaticEnd***************************************************************/



/**
  * \brief Take a function name and the name of the library that
  * implements it, and dynamically map in that functions code.  
  * Add a map from the function name to the actual function.
  */

void
Os_DynamicallyLinkFunction (st_table * nameToFunction,
                char *aName, char *library)
{
  // based on manpage for dlopen
  void *handle;
  void (*aFunction) ();
  char *error;

  // ... Optionally, RTLD_GLOBAL may be or’ed with flag,  in  which  case
  // the  external  symbols defined in the library will be made available to
  // subsequently loaded libraries.
  handle = dlopen (library, RTLD_NOW | RTLD_GLOBAL);
  if (handle == NULL)
    {
      printf ("%s\n", dlerror ());
      assert (0);
    }

  aFunction = ( void (*)() ) dlsym (handle, aName);
  if ((error = dlerror ()) != NULL)
    {
      fprintf (stderr, "%s\n", error);
      assert (0);
    }
  if (nameToFunction != NIL (st_table))
    {
      Hash_Insert (nameToFunction, aName, (char *) aFunction);
    }
}