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INET_ADDR(P) POSIX Programmer's Manual INET_ADDR(P)
NAME
inet_addr, inet_ntoa - IPv4 address manipulation
SYNOPSIS
#include <arpa/inet.h>
in_addr_t inet_addr(const char *cp);
char *inet_ntoa(struct in_addr in);
DESCRIPTION
The inet_addr() function shall convert the string pointed to by cp, in the standard
IPv4 dotted decimal notation, to an integer value suitable for use as an Internet
address.
The inet_ntoa() function shall convert the Internet host address specified by in to
a string in the Internet standard dot notation.
The inet_ntoa() function need not be reentrant. A function that is not required to
be reentrant is not required to be thread-safe.
All Internet addresses shall be returned in network order (bytes ordered from left
to right).
Values specified using IPv4 dotted decimal notation take one of the following
forms:
a.b.c.d
When four parts are specified, each shall be interpreted as a byte of data
and assigned, from left to right, to the four bytes of an Internet address.
a.b.c When a three-part address is specified, the last part shall be interpreted
as a 16-bit quantity and placed in the rightmost two bytes of the network
address. This makes the three-part address format convenient for specifying
Class B network addresses as "128.net.host" .
a.b When a two-part address is supplied, the last part shall be interpreted as a
24-bit quantity and placed in the rightmost three bytes of the network
address. This makes the two-part address format convenient for specifying
Class A network addresses as "net.host" .
a When only one part is given, the value shall be stored directly in the net-
work address without any byte rearrangement.
All numbers supplied as parts in IPv4 dotted decimal notation may be decimal,
octal, or hexadecimal, as specified in the ISO C standard (that is, a leading 0x or
0X implies hexadecimal; otherwise, a leading '0' implies octal; otherwise, the num-
ber is interpreted as decimal).
RETURN VALUE
Upon successful completion, inet_addr() shall return the Internet address. Other-
wise, it shall return ( in_addr_t)(-1).
The inet_ntoa() function shall return a pointer to the network address in Internet
standard dot notation.
ERRORS
No errors are defined.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
The return value of inet_ntoa() may point to static data that may be overwritten by
subsequent calls to inet_ntoa().
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
endhostent() , endnetent() , the Base Definitions volume of IEEE Std 1003.1-2001,
<arpa/inet.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std
1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating
System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C)
2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The
Open Group. In the event of any discrepancy between this version and the original
IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is
the referee document. The original Standard can be obtained online at
http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 INET_ADDR(P)
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