### 4.4 Logging handler

Data type: gcry_handler_log_t ¶

  This type is defined as: `void (*gcry_handler_log_t) (void *, int, const char *, va_list)`

Function: void gcry_set_log_handler (gcry_handler_log_t func_log, void *cb_data) ¶

  This function registers func_log as ‘logging handler’, which means that it will be called in case Libgcrypt wants to log a message. This function may and should be used prior to calling `gcry_check_version`.