07-10-2008
Could you pls give us some suggestion on my query?????
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LEARN ABOUT CENTOS
ares_gethostbyaddr
ARES_GETHOSTBYADDR(3) Library Functions Manual ARES_GETHOSTBYADDR(3)
NAME
ares_gethostbyaddr - Initiate a host query by address
SYNOPSIS
#include <ares.h>
typedef void (*ares_host_callback)(void *arg, int status,
int timeouts, struct hostent *hostent)
void ares_gethostbyaddr(ares_channel channel, const void *addr,
int addrlen, int family, ares_host_callback callback,
void *arg)
DESCRIPTION
The ares_gethostbyaddr function initiates a host query by address on the name service channel identified by channel. The parameters addr
and addrlen give the address as a series of bytes, and family gives the type of address. 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_gethostbyaddr 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 look up addresses of type family.
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_gethostbyname(3)
AUTHOR
Greg Hudson, MIT Information Systems
Copyright 1998 by the Massachusetts Institute of Technology.
24 July 1998 ARES_GETHOSTBYADDR(3)