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Dld

3.4 Invoking Dynamically Linked Functions

Dynamically linked functions may still be invoked from modules (e.g., main) that do not contain references to such functions.

Function: unsigned long dld_get_symbol (const char *id)

Returns the entry point of the function named id if found, 0 if not found. Non-zero returned values can be used as pointers to the functions.

Function: unsigned long dld_get_func (const char *func)

Returns the address of the global variable named func if found, 0 if not found.

A typical use of dld_get_func would be:

{ void (*func) (); int error_code; ... /* First, link in the object file "my_object_file.o". Proceed only if the link operation is successful, i.e. it returns 0. "my_new_func" is a function defined in "my_object_file.o". Set func to point at the entry point of this function and then invoke it indirectly through func. */ if ((error_code = dld_link ("my_object_file.o")) == 0) { if ((func = (void (*) ()) get_func ("my_new_func")) != 0) (*func) (); ... } else { ... } }