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ares_getnameinfo(3) [debian man page]

ARES_GETNAMEINFO(3)					     Library Functions Manual					       ARES_GETNAMEINFO(3)

NAME

       ares_getnameinfo - Address-to-nodename translation in protocol-independent manner

SYNOPSIS

       #include <ares.h>

       typedef void (*ares_nameinfo_callback)(void *arg, int status,
       int timeouts, char *node, char *service)

       void ares_getnameinfo(ares_channel channel, const struct sockaddr *sa,
	    ares_socklen_t salen, int flags, ares_nameinfo_callback callback,
	    void *arg)

DESCRIPTION

       The  ares_getnameinfo  function	is  defined  for  protocol-independent address translation. The function is a combination of ares_gethost-
       byaddr(3) and getservbyport(3). The function will translate the address either by executing a host query on the name service channel  iden-
       tified  by  channel  or it will attempt to resolve it locally if possible.  The parameters sa and len give the address as a sockaddr struc-
       ture, and flags gives the options that the function will use.  Valid flags are listed below:

       ARES_NI_NOFQDN	  Only the nodename portion of the FQDN is returned for local hosts.

       ARES_NI_NUMERICHOST
			  The numeric form of the hostname is returned rather than the name.

       ARES_NI_NAMEREQD   An error is returned if the hostname cannot be found in the DNS.

       ARES_NI_NUMERICSERV
			  The numeric form of the service is returned rather than the name.

       ARES_NI_TCP	  The service name is to be looked up for the TCP protocol.

       ARES_NI_UDP	  The service name is to be looked up for the UDP protocol.

       ARES_NI_SCTP	  The service name is to be looked up for the SCTP protocol.

       ARES_NI_DCCP	  The service name is to be looked up for the DCCP protocol.

       ARES_NI_NUMERICSCOPE
			  The numeric form of the scope ID is returned rather than the name.

       ARES_NI_LOOKUPHOST A hostname lookup is being requested.

       ARES_NI_LOOKUPSERVICE
			  A service name lookup is being requested.

       When the query is complete or has failed, the ares library will invoke callback.  Completion or failure of the  query  may  happen  immedi-
       ately, or may happen during a later call to ares_process(3), ares_destroy(3) or ares_cancel(3).

       The  callback argument arg is copied from the ares_getnameinfo argument arg.  The callback argument status indicates whether the query suc-
       ceeded and, if not, how it failed.  It may have any of the following values:

       ARES_SUCCESS	  The host lookup completed successfully.

       ARES_ENOTIMP	  The ares library does not know how to look up addresses of type family.

       ARES_ENOTFOUND	  The address addr was not found.

       ARES_ENOMEM	  Memory was exhausted.

       ARES_EDESTRUCTION  The name service channel channel is being destroyed; the query will not be completed.

       ARES_EBADFLAGS	  The flags parameter contains an illegal value.

       The callback argument timeouts reports how many times a query timed out during the execution of the given request.

       On successful completion of the query, the callback argument node contains a string representing the hostname (assuming	ARES_NI_LOOKUPHOST
       was  specified).  Additionally, service contains a string representing the service name (assuming ARES_NI_LOOKUPSERVICE was specified).	If
       the query did not complete successfully, or one of the values was not requested, node or service will be NULL.

SEE ALSO

       ares_process(3), ares_getaddrinfo(3)

AUTHOR

       Dominick Meglio
       Copyright 2005 by Dominick Meglio.

								    1 May 2009						       ARES_GETNAMEINFO(3)

Check Out this Related Man Page

ARES_GETHOSTBYNAME(3)					     Library Functions Manual					     ARES_GETHOSTBYNAME(3)

NAME

       ares_gethostbyname - Initiate a host query by name

SYNOPSIS

       #include <ares.h>

       typedef void (*ares_host_callback)(void *arg, int status,
       int timeouts, struct hostent *hostent)

       void ares_gethostbyname(ares_channel channel, const char *name,
	    int family, ares_host_callback callback, void *arg)

DESCRIPTION

       The ares_gethostbyname function initiates a host query by name on the name service channel identified by channel.  The parameter name gives
       the hostname as a NUL-terminated C string, and family gives the desired type of address for the resulting host entry.  When  the  query	is
       complete  or  has  failed, the ares library will invoke callback.  Completion or failure of the query may happen immediately, or may happen
       during a later call to ares_process(3), ares_destroy(3) or ares_cancel(3).

       The callback argument arg is copied from the ares_gethostbyname argument arg.  The callback argument status  indicates  whether	the  query
       succeeded and, if not, how it failed.  It may have any of the following values:

       ARES_SUCCESS	  The host lookup completed successfully.

       ARES_ENOTIMP	  The ares library does not know how to find addresses of type family.

       ARES_EBADNAME	  The hostname name is composed entirely of numbers and periods, but is not a valid representation of an Internet address.

       ARES_ENOTFOUND	  The address addr was not found.

       ARES_ENOMEM	  Memory was exhausted.

       ARES_ECANCELLED	  The query was cancelled.

       ARES_EDESTRUCTION  The name service channel channel is being destroyed; the query will not be completed.

       The callback argument timeouts reports how many times a query timed out during the execution of the given request.

       On successful completion of the query, the callback argument hostent points to a struct hostent containing the name of the host returned by
       the query.  The callback need not and should not attempt to free the memory pointed to by hostent; the ares library will free it  when  the
       callback returns.  If the query did not complete successfully, hostent will be NULL.

SEE ALSO

       ares_process(3), ares_gethostbyaddr(3)

AUTHOR

       Greg Hudson, MIT Information Systems
       Copyright 1998 by the Massachusetts Institute of Technology.

								   25 July 1998 					     ARES_GETHOSTBYNAME(3)
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