static int auth_server_input_spid ( struct auth_server_connection * conn , const char * const * args ) {
 if ( conn -> handshake_received ) {
 i_error ( "BUG: Authentication server already sent handshake" ) ;
 return - 1 ;
 }
 if ( str_to_uint ( args [ 0 ] , & conn -> server_pid ) < 0 ) {
 i_error ( "BUG: Authentication server sent invalid PID" ) ;
 return - 1 ;
 }
 return 0 ;
 }
static int auth_server_input_spid ( struct auth_server_connection * conn , const char * const * args ) {
 if ( conn -> handshake_received ) {
 i_error ( "BUG: Authentication server already sent handshake" ) ;
 return - 1 ;
 }
 if ( str_to_uint ( args [ 0 ] , & conn -> server_pid ) < 0 ) {
 i_error ( "BUG: Authentication server sent invalid PID" ) ;
 return - 1 ;
 }
 return 0 ;
 }