gethostbyaddr() -- Sockets Function (libsocket)

Retrieve host information by address
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <sys/socket.h>
struct hostent *gethostbyaddr(addr, len, type)
char *host;
int len, type;

Function   gethostbyaddr()  interrogates   file   /etc/hosts  and   returns
information about a given host on a network.

addr  gives the  address at  which the host's  Internet address  resides in
memory.  length gives the number of characters in its name.  type gives the
type  of address  this is.   If  it is  anything other  than type  AF_INET,
gethostbyaddr() returns NULL.

If it  could find information  about the host  in question, gethostbyaddr()
returns the address in a instance of structure hostent, which is defined in
header file <netdb.h>. If it could not, it returns NULL.

See Also

endhostent(),
gethostbyname(),
libsocket,
sethostent()












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© 2012 by Stephen A. Ness