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INET(3) Linux Programmer's Manual INET(3)
NAME
inet_aton, inet_addr, inet_network, inet_ntoa, inet_makeaddr,
inet_lnaof, inet_netof - Internet address manipulation routines
SYNOPSIS
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
int inet_aton(const char *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 struc-
ture that inp points to. inet_aton() returns non-zero 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obsolete interface to inet_aton(), described immediately above; it is
obsolete because -1 is a valid address (255.255.255.255), and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 subse-
quent 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 Inter-
net 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 (little endian), whereas the network byte order, as used on the
Internet, is Most Significant Byte first (big endian).
NOTE
When you using numbers-and-dots notation for addresses, be aware that
each number will be interpreted as octal if preceeded by a 0 and as
hexadecimal if preceeded by 0x. For example,
inet_aton("226.000.000.037", &t) will interpret the address as
266.0.0.31 and not 226.0.0.37.
GLIBC NOTES
In order to expose the declaration of inet_aton(), one of the feature
test macros _BSD_SOURCE, _SVID_SOURCE, or _GNU_SOURCE must be defined.
CONFORMING TO
4.3BSD
SEE ALSO
gethostbyname(3), getnetent(3), inet_ntop(3), inet_pton(3), hosts(5),
networks(5)
BSD 2001-07-25 INET(3)
Man(1) output converted with
man2html and wrapped by fishsponge
This page was generated on Tue Feb 13 02:17:55 GMT 2007
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