h_errno

The h_errno variable returns the last name resolution error that occurred in the current thread.

Syntax

#include <netdb.h>
int h_errno

Description

The h_errno variable returns the last name resolution error that occurred in the current thread. These error codes are set by gethostname(), res_send(), res_query(), res_querydomain(), and res_search().

Return Values

The value -1 indicates an error code is unavailable. A non-zero, non-negative returned value is the TCP/IP error code.

Error Code

Description

HOST _ NOT _ FOUND

Thehostcannotbefound . TRY _ AGAIN

Serverfailure . NO _ RECOVERY

Non - recoverableerror . NO _ DATA

Validname ;nodatarecordofrequestedtype . NO _ ADDRESS

Noaddress ;lookforMXrecord( mailexchangerecordusedbyDNS ) .

[Back: _getshort()]
[Next: htonl()]