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Rev Author # Line
1 perry 1 INET
2 !!!INET
3 NAME
4 SYNOPSIS
5 DESCRIPTION
6 CONFORMING TO
7 SEE ALSO
8 ----
9 !!NAME
10
11
12 inet_aton, inet_addr, inet_network, inet_ntoa, inet_makeaddr, inet_lnaof, inet_netof - Internet address manipulation routines
13 !!SYNOPSIS
14
15
16 __#include
17 __''cp''__, struct in_addr *__''inp''__);
18 in_addr_t inet_addr(const char *__''cp''__);
19 in_addr_t inet_network(const char *__''cp''__);
20 char *inet_ntoa(struct in_addr__ ''in''__);
21 struct in_addr inet_makeaddr(int__ ''net''__, int__ ''host''__);
22 in_addr_t inet_lnaof(struct in_addr__ ''in''__);
23 in_addr_t inet_netof(struct in_addr__ ''in''__);
24 __
25 !!DESCRIPTION
26
27
28 __inet_aton()__ converts the Internet host address
29 ''cp'' from the standard numbers-and-dots notation into
30 binary data and stores it in the structure that ''inp''
31 points to. __inet_aton__ returns nonzero if the address
32 is valid, zero if not.
33
34
35 The __inet_addr()__ function converts the Internet host
36 address ''cp'' from numbers-and-dots notation into binary
37 data in network byte order. If the input is invalid,
38 INADDR_NONE (usually -1) is returned. This is an
39 ''obsolete'' interface to __inet_aton__, described
40 immediately above; it is obsolete because -1 is a valid
41 address (255.255.255.255), and __inet_aton__ provides a
42 cleaner way to indicate error return.
43
44
45 The __inet_network()__ function extracts the network
46 number in host byte order from the address ''cp'' in
47 numbers-and-dots notation. If the input is invalid, -1 is
48 returned.
49
50
51 The __inet_ntoa()__ function converts the Internet host
52 address ''in'' given in network byte order to a string in
53 standard numbers-and-dots notation. The string is returned
54 in a statically allocated buffer, which subsequent calls
55 will overwrite.
56
57
58 The __inet_makeaddr()__ function makes an Internet host
59 address in network byte order by combining the network
60 number ''net'' with the local address ''host'' in
61 network ''net'', both in local host byte
62 order.
63
64
65 The __inet_lnaof()__ function returns the local host
66 address part of the Internet address ''in''. The local
67 host address is returned in local host byte
68 order.
69
70
71 The __inet_netof()__ function returns the network number
72 part of the Internet Address ''in''. The network number
73 is returned in local host byte order.
74
75
76 The structure ''in_addr'' as used in __inet_ntoa()__,
77 __inet_makeaddr()__, __inet_lnoaf()__ and
78 __inet_netof()__ is defined in ''netinet/in.h''
79 as:
80
81
82 struct in_addr {
83 unsigned long int s_addr;
84 }
85
86
87 Note that on the i80x86 the host byte order is Least
88 Significant Byte first, whereas the network byte order, as
89 used on the Internet, is Most Significant Byte
90 first.
91 !!CONFORMING TO
92
93
94 BSD 4.3
95 !!SEE ALSO
96
97
98 gethostbyname(3), getnetent(3),
99 inet_ntop(3), __inet_pton__(3), hosts(5),
100 networks(5)
101 ----
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