05-20-2009
Gurus , I got it resolved. Thanks to all of you for ur help.
Last edited by henrysmith; 05-21-2009 at 02:02 PM..
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LEARN ABOUT FREEBSD
realhostname_sa
REALHOSTNAME_SA(3) BSD Library Functions Manual REALHOSTNAME_SA(3)
NAME
realhostname_sa -- convert a struct sockaddr to the real host name
LIBRARY
System Utilities Library (libutil, -lutil)
SYNOPSIS
#include <sys/types.h>
#include <netinet/in.h>
#include <libutil.h>
int
realhostname_sa(char *host, size_t hsize, struct sockaddr *addr, int addrlen);
DESCRIPTION
The function realhostname_sa() converts addr to the corresponding host name. This is done by resolving addr to a host name and then ensuring
that the host name resolves back to addr.
host must point to a buffer of at least hsize bytes, and will always be written to by this function.
If the name resolution does not work both ways or if the host name is longer than hsize bytes, getnameinfo(3) with NI_NUMERICHOST specified,
is used to convert addr to an ASCII form.
If the string written to host is hsize bytes long, host will not be NUL terminated.
RETURN VALUES
The realhostname_sa() function will return one of the following constants which are defined in <libutil.h>:
HOSTNAME_FOUND
A valid host name was found.
HOSTNAME_INCORRECTNAME
A host name was found, but it did not resolve back to the passed ip. host now contains the numeric value of ip.
HOSTNAME_INVALIDADDR
ip could not be resolved. host now contains the numeric value of ip.
HOSTNAME_INVALIDNAME
A host name was found, but it could not be resolved back to any ip number. host now contains the numeric value of ip.
SEE ALSO
getaddrinfo(3), getnameinfo(3), realhostname(3)
BSD
January 11, 2000 BSD