1krb5_set_trace_callback - Specify a callback function for trace events. 2========================================================================= 3 4.. 5 6.. c:function:: krb5_error_code krb5_set_trace_callback(krb5_context context, krb5_trace_callback fn, void * cb_data) 7 8.. 9 10 11:param: 12 13 **[in]** **context** - Library context 14 15 **[in]** **fn** - Callback function 16 17 **[in]** **cb_data** - Callback data 18 19 20.. 21 22 23 24:return: 25 - Returns KRB5_TRACE_NOSUPP if tracing is not supported in the library (unless fn is NULL). 26 27.. 28 29 30 31 32 33 34 35Specify a callback for trace events occurring in krb5 operations performed within *context* . *fn* will be invoked with *context* as the first argument, *cb_data* as the last argument, and a pointer to a krb5_trace_info as the second argument. If the trace callback is reset via this function or *context* is destroyed, *fn* will be invoked with a NULL second argument so it can clean up *cb_data* . Supply a NULL value for *fn* to disable trace callbacks within *context* . 36 37 38 39 40 41 42 43 44 45 46.. 47 48 49 50 51 52 53.. note:: 54 55 This function overrides the information passed through the *KRB5_TRACE* environment variable. 56 57 58 59.. note:: 60 61 New in 1.9 62 63 64