# dkim_set_final()

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SYNOPSIS |
    #include <dkim.h>
    DKIM_STAT dkim_set_final(
    	DKIM_LIB *libopendkim,
            DKIM_CBSTAT (*func)(DKIM *dkim, DKIM_SIGINFO **sigs, int nsigs));
    );
Defines a callback function to be used for final scanning and sorting of the signatures discovered on a message. From within `dkim_eoh()`, an array of `DKIM_SIGINFO` handles is allocated, and an array of pointers is created referring to them. During `dkim_eoh()`, a prescreen callback may be used to do initial sorting, analysis and disqualification of discovered signatures. If this callback function is defined, it will be called by `dkim_eom()` to give the caller a final opportunity to review the signatures and possibly reorder or flag them for special treatment by the library now that the entire body has arrived and body hashes can be computed. `sigs` will refer to the array of discovered signatures and `nsigs` will indicate the length of this array. From within this callback you can use `dkim_sig_getcontext()` on any of the `DKIM_SIGINFO` pointers to retrieve the user-allocated context specific to that signature as created earlier by the allocation callback set by `dkim_set_signature_handle()` and make use of the data found there. That context is not used by the library in any way. Also available are `dkim_sig_getflags()` to retrieve current processing flags assigned to a signature, `dkim_sig_getbh()` to retrieve the results of the body hash comparison done (if any) on the signature, and `dkim_sig_process()` to retrieve the key named by the signature and attempt public key verification and body hash comparison. The callback can also use the function `dkim_sig_ignore()` to indicate to the library that the signature should be ignored. The callback should return one of the `DKIM_CBSTAT` return values. Any other value will cause `dkim_eoh()` to abort and return a status of `DKIM_STAT_CBINVALID`.
DESCRIPTION |
Called When | `dkim_set_final()` must be called before `dkim_eom()` has been called.
ARGUMENTS |
Argument | Description
--- | ---
libopendkim | The library instantiation handle, returned by `dkim_init()`.
func | A pointer to a function which takes a `DKIM` handle, a pointer to an array of `DKIM_SIGINFO` handles and an integer indicating the length of that array as parameters. If NULL, no callback will be used.
RETURN VALUES | `DKIM_STAT_OK` -- success `DKIM_STAT_INVALID` -- `dkim` referred to a signing handle rather than a verifying handle
NOTES | None.

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