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#include <dkim.h>
DKIM_STAT dkim_set_signature_handle(
	DKIM_LIB *libopendkim,
        void * (*func)(void *closure));
Defines a callback function to be used for allocating local data storage to be associated with signatures.

From within dkim_eoh(), each discovered signature is assigned a DKIM_SIGINFO handle. If this callback function is defined, it will be called once for each such handle to allocate any caller-side storage that might be desired by the caller; the return value is assumed to be a pointer to such storage, and can be retrieved later by the caller during signature processing.

Called When dkim_set_signature_handle() must be called before dkim_eoh() has been called.
libopendkim Library-specific handle, returned by dkim_init().
func A pointer to a function which takes a single void pointer that is the same as the memclosure passed to dkim_verify(). If NULL, no callback will be used.
  • DKIM_STAT_OK -- success
  • None.

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