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#include <netlink/handlers.h>
/* Allocate a callback set and initialize it to the verbose default set */
struct nl_cb *cb = nl_cb_alloc(NL_CB_VERBOSE);
/* Modify the set to call my_func() for all valid messages */
nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, my_func, NULL);
/*
* Set the error message handler to the verbose default implementation
* and direct it to print all errors to the given file descriptor.
*/
FILE *file = fopen(...);
nl_cb_err(cb, NL_CB_VERBOSE, NULL, file);
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