View Source: inet_network(3) - Waikato Linux Users Group

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INET
!!!INET
NAME
SYNOPSIS
DESCRIPTION
CONFORMING TO
SEE ALSO
----
!!NAME


inet_aton, inet_addr, inet_network, inet_ntoa, inet_makeaddr, inet_lnaof, inet_netof - Internet address manipulation routines
!!SYNOPSIS


__#include
__''cp''__, struct in_addr *__''inp''__);
in_addr_t inet_addr(const char *__''cp''__);
in_addr_t inet_network(const char *__''cp''__);
char *inet_ntoa(struct in_addr__ ''in''__);
struct in_addr inet_makeaddr(int__ ''net''__, int__ ''host''__);
in_addr_t inet_lnaof(struct in_addr__ ''in''__);
in_addr_t inet_netof(struct in_addr__ ''in''__);
__
!!DESCRIPTION


__inet_aton()__ converts the Internet host address
''cp'' from the standard numbers-and-dots notation into
binary data and stores it in the structure that ''inp''
points to. __inet_aton__ returns nonzero if the address
is valid, zero if not.


The __inet_addr()__ function converts the Internet host
address ''cp'' from numbers-and-dots notation into binary
data in network byte order. If the input is invalid,
INADDR_NONE (usually -1) is returned. This is an
''obsolete'' interface to __inet_aton__, described
immediately above; it is obsolete because -1 is a valid
address (255.255.255.255), and __inet_aton__ provides a
cleaner way to indicate error return.


The __inet_network()__ function extracts the network
number in host byte order from the address ''cp'' in
numbers-and-dots notation. If the input is invalid, -1 is
returned.


The __inet_ntoa()__ function converts the Internet host
address ''in'' given in network byte order to a string in
standard numbers-and-dots notation. The string is returned
in a statically allocated buffer, which subsequent calls
will overwrite.


The __inet_makeaddr()__ function makes an Internet host
address in network byte order by combining the network
number ''net'' with the local address ''host'' in
network ''net'', both in local host byte
order.


The __inet_lnaof()__ function returns the local host
address part of the Internet address ''in''. The local
host address is returned in local host byte
order.


The __inet_netof()__ function returns the network number
part of the Internet Address ''in''. The network number
is returned in local host byte order.


The structure ''in_addr'' as used in __inet_ntoa()__,
__inet_makeaddr()__, __inet_lnoaf()__ and
__inet_netof()__ is defined in ''netinet/in.h''
as:


struct in_addr {
unsigned long int s_addr;
}


Note that on the i80x86 the host byte order is Least
Significant Byte first, whereas the network byte order, as
used on the Internet, is Most Significant Byte
first.
!!CONFORMING TO


BSD 4.3
!!SEE ALSO


gethostbyname(3), getnetent(3),
inet_ntop(3), __inet_pton__(3), hosts(5),
networks(5)
----

3 pages link to inet_network(3):

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Last edited on Tuesday, June 4, 2002 12:24:24 am by "perry"

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