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Rev Author # Line
1 perry 1 !!NAME
2 inet_aton, inet_addr, inet_network, inet_ntoa, inet_makeaddr, inet_lnaof, inet_netof - Internet address manipulation routines
3 !!SYNOPSIS
5 SamJansen 4 __#include <sys/socket.h>__
5 __#include <netinet/in.h>__
6 __#include <arpa/inet.h>__
1 perry 7
5 SamJansen 8 __int inet_aton(const char *__''cp''__, struct in_addr *__''inp''__);__
9 __in_addr_t inet_addr(const char *__''cp''__);__
10 __in_addr_t inet_network(const char *__''cp''__);__
11 __char *inet_ntoa(struct in_addr__ ''in''__);__
12 __struct in_addr inet_makeaddr(int__ ''net''__, int__ ''host''__);__
13 __in_addr_t inet_lnaof(struct in_addr__ ''in''__);__
14 __in_addr_t inet_netof(struct in_addr__ ''in''__);__
1 perry 15 !!DESCRIPTION
16
17
18 __inet_aton()__ converts the Internet host address
19 ''cp'' from the standard numbers-and-dots notation into
20 binary data and stores it in the structure that ''inp''
21 points to. __inet_aton__ returns nonzero if the address
22 is valid, zero if not.
23
24
25 The __inet_addr()__ function converts the Internet host
26 address ''cp'' from numbers-and-dots notation into binary
27 data in network byte order. If the input is invalid,
28 INADDR_NONE (usually -1) is returned. This is an
29 ''obsolete'' interface to __inet_aton__, described
30 immediately above; it is obsolete because -1 is a valid
31 address (255.255.255.255), and __inet_aton__ provides a
32 cleaner way to indicate error return.
33
34
35 The __inet_network()__ function extracts the network
36 number in host byte order from the address ''cp'' in
37 numbers-and-dots notation. If the input is invalid, -1 is
38 returned.
39
40
41 The __inet_ntoa()__ function converts the Internet host
42 address ''in'' given in network byte order to a string in
43 standard numbers-and-dots notation. The string is returned
44 in a statically allocated buffer, which subsequent calls
45 will overwrite.
46
47
48 The __inet_makeaddr()__ function makes an Internet host
49 address in network byte order by combining the network
50 number ''net'' with the local address ''host'' in
51 network ''net'', both in local host byte
52 order.
53
54
55 The __inet_lnaof()__ function returns the local host
56 address part of the Internet address ''in''. The local
57 host address is returned in local host byte
58 order.
59
60
61 The __inet_netof()__ function returns the network number
62 part of the Internet Address ''in''. The network number
63 is returned in local host byte order.
64
65
66 The structure ''in_addr'' as used in __inet_ntoa()__,
67 __inet_makeaddr()__, __inet_lnoaf()__ and
68 __inet_netof()__ is defined in ''netinet/in.h''
69 as:
70
71
5 SamJansen 72 struct in_addr {
73 unsigned long int s_addr;
74 }
1 perry 75
76
77 Note that on the i80x86 the host byte order is Least
78 Significant Byte first, whereas the network byte order, as
79 used on the Internet, is Most Significant Byte
80 first.
81 !!CONFORMING TO
82
83
84 BSD 4.3
85 !!SEE ALSO
86
87
88 gethostbyname(3), getnetent(3),
5 SamJansen 89 inet_ntop(3), inet_pton(3), hosts(5),
1 perry 90 networks(5)
91 ----
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