yp_errno() returns the error code of the previous operation.
Possible errors are:
| 1 args to function are bad |
| 2 RPC failure - domain has been unbound |
| 3 can't bind to server on this domain |
| 4 no such map in server's domain |
| 5 no such key in map |
| 6 internal yp server or client error |
| 7 resource allocation failure |
| 8 no more records in map database |
| 9 can't communicate with portmapper |
| 10 can't communicate with ypbind |
| 11 can't communicate with ypserv |
| 12 local domain name not set |
| 13 yp database is bad |
| 14 yp version mismatch |
| 15 access violation |
| 16 database busy |
See also yp_err_string().