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#include <sys/dxe.h> extern void *(*dlsymresolver) (const char *symname);
This is a pointer to a function (e.g. replaceable) containing a pointer to a function that is called when an unresolved symbol cannot be found in all the symbol tables that the dynamic loader have at his disposition. For example, as a last resort, the routine could return the address of a dummy function -- this allows loading modules that you don't know in advance which unresolved symbols it contains. Of course, the functions that use this last-resort dummy function will be, most likely, unuseable but at least you may query the address of some table inside the module, for example, and process it somehow.
The handler should return
NULL to rise a error condition, otherwise
it should return a valid address.
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