GSP
Quick Navigator

Search Site

Unix VPS
A - Starter
B - Basic
C - Preferred
D - Commercial
MPS - Dedicated
Previous VPSs
* Sign Up! *

Support
Contact Us
Online Help
Handbooks
Domain Status
Man Pages

FAQ
Virtual Servers
Pricing
Billing
Technical

Network
Facilities
Connectivity
Topology Map

Miscellaneous
Server Agreement
Year 2038
Credits
 

USA Flag

 

 

Man Pages
ARES_GETHOSTBYADDR(3) FreeBSD Library Functions Manual ARES_GETHOSTBYADDR(3)

ares_gethostbyaddr - Initiate a host query by address

#include <ares.h>
typedef void (*ares_host_callback)(void *arg, int status,
struct hostent *hostent)
void ares_gethostbyaddr(ares_channel channel, const void *addr,
	int addrlen, int family, ares_host_callback callback,
	void *arg)

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) or ares_destroy(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_EDESTRUCTION
The name service channel channel is being destroyed; the query will not be completed.

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.

ares_process(3)

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

Search for    or go to Top of page |  Section 3 |  Main Index

Powered by GSP Visit the GSP FreeBSD Man Page Interface.
Output converted with ManDoc.