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11 .TH INET_ADDR 3XNET "Jun 10, 2002"
13 inet_addr, inet_network, inet_makeaddr, inet_lnaof, inet_netof, inet_ntoa \-
14 Internet address manipulation
18 \fBcc\fR [ \fIflag\fR ... ] \fIfile\fR ... \fB-lxnet\fR [ \fIlibrary\fR ... ]
19 #include <arpa/inet.h>
21 \fBin_addr_t\fR \fBinet_addr\fR(\fBconst char *\fR\fIcp\fR);
26 \fBin_addr_t\fR \fBinet_lnaof\fR(\fBstruct in_addr\fR \fIin\fR);
31 \fBstruct in_addr\fR \fBinet_makeaddr\fR(\fBin_addr_t\fR \fInet\fR, \fBin_addr_t\fR \fIlna\fR);
36 \fBin_addr_t\fR \fBinet_netof\fR(\fBstruct in_addr\fR \fIin\fR);
41 \fBin_addr_t\fR \fBinet_network\fR(\fBconst char *\fR\fIcp\fR);
46 \fBchar *\fR\fBinet_ntoa\fR(\fBstruct in_addr\fR \fIin\fR);
52 The \fBinet_addr()\fR function converts the string pointed to by \fIcp\fR, in
53 the Internet standard dot notation, to an integer value suitable for use as an
57 The \fBinet_lnaof()\fR function takes an Internet host address specified by
58 \fIin\fR and extracts the local network address part, in host byte order.
61 The \fBinet_makeaddr()\fR function takes the Internet network number specified
62 by \fInet\fR and the local network address specified by \fIlna\fR, both in host
63 byte order, and constructs an Internet address from them.
66 The \fBinet_netof()\fR function takes an Internet host address specified by
67 \fIin\fR and extracts the network number part, in host byte order.
70 The \fBinet_network()\fR function converts the string pointed to by \fIcp\fR,
71 in the Internet standard dot notation, to an integer value suitable for use as
72 an Internet network number.
75 The \fBinet_ntoa()\fR function converts the Internet host address specified by
76 \fIin\fR to a string in the Internet standard dot notation.
79 All Internet addresses are returned in network order (bytes ordered from left
83 Values specified using dot notation take one of the following forms:
90 When four parts are specified, each is interpreted as a byte of data and
91 assigned, from left to right, to the four bytes of an Internet address.
100 When a three-part address is specified, the last part is interpreted as a
101 16-bit quantity and placed in the rightmost two bytes of the network address.
102 This makes the three-part address format convenient for specifying Class B
103 network addresses as \fB128.\fR\fInet\fR.\fIhost\fR.
112 When a two-part address is supplied, the last part is interpreted as a 24-bit
113 quantity and placed in the rightmost three bytes of the network address. This
114 makes the two-part address format convenient for specifying Class A network
115 addresses as \fInet\fR\fB\&.\fR\fIhost\fR.
124 When only one part is given, the value is stored directly in the network
125 address without any byte rearrangement.
130 All numbers supplied as parts in dot notation may be decimal, octal, or
131 hexadecimal, that is, a leading 0x or 0X implies hexadecimal, as specified in
132 the \fIISO C\fR standard; otherwise, a leading 0 implies octal; otherwise, the
133 number is interpreted as decimal.
137 The return value of \fBinet_ntoa()\fR may point to static data that may be
138 overwritten by subsequent calls to \fBinet_ntoa()\fR.
142 Upon successful completion, \fBinet_addr()\fR returns the Internet address.
143 Otherwise, it returns (\fBin_addr_t\fR)(\(mi1).
146 Upon successful completion, \fBinet_network()\fR returns the converted Internet
147 network number. Otherwise, it returns (\fBin_addr_t\fR)(\(mi1).
150 The \fBinet_makeaddr()\fR function returns the constructed Internet address.
153 The \fBinet_lnaof()\fR function returns the local network address part.
156 The \fBinet_netof()\fR function returns the network number.
159 The \fBinet_ntoa()\fR function returns a pointer to the network address in
160 Internet-standard dot notation.
164 No errors are defined.
168 See \fBattributes\fR(5) for descriptions of the following attributes:
176 ATTRIBUTE TYPE ATTRIBUTE VALUE
178 Interface Stability Standard
186 \fBendhostent\fR(3XNET), \fBendnetent\fR(3XNET), \fBattributes\fR(5),