Re: dlopen

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Bob Cowling (cowling++at++torus.autometric.com)
Mon, 10 Feb 1997 09:52:55 -0500

There are several ways to access the variable "g" - and someone else has
outlined how to construct the static version.

In your case, since you have two "g"s in your executable, you do want to remain
using dlopen (vs. sgidladd). This will prevent the ambiguity of which "g" is
actually being used.

Use the handle returned from the dlopen to access the variable "g" in the
second DSO.

For example (from man dlsym)

          void *handle;
          int i, *iptr;
          int (*fptr)(int);

          /* open the needed object */
          handle = dlopen("/usr/mydir/libx.so", RTLD_LAZY);

          /* find address of function and data objects */
          fptr = (int (*)(int))dlsym(handle, "some_function");

          iptr = (int *)dlsym(handle, "int_object");

          /* invoke function, passing value of integer as a parameter */

          i = (*fptr)(*iptr);

DSOs are Cool!

Bob

-- 
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Robert Cowling                                cowling++at++autometric.com
Director, Product Engineering                         (703) 658-4035
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