Content-type: text/html Man page of inet_addr

inet_addr

Section: C Library Functions (3)
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NAME

inet_addr - Translates an Internet network address string to an Internet address integer  

LIBRARY

Standard C Library (libc.so, libc.a)  

SYNOPSIS

#include <arpa/inet.h>

in_addr_t inet_addr(        const char *string) ;
 

STANDARDS

Interfaces documented on this reference page conform to industry standards as follows:

inet_addr(): XPG4-UNIX

Refer to the standards(5) reference page for more information about industry standards and associated tags.  

PARAMETERS

Defines an Internet dot-formatted address character string of the form a.b.c.d, where a, b, c, and d may be expressed as decimal, octal, or hexadecimal integers in the C idiom.  

DESCRIPTION

The inet_addr() function translates a dot-formatted Internet character address string to an Internet address integer. The Internet address integer is returned as a network byte-ordered integer.

Values specified using dot notation take on one of the following forms: When all four parts are specified, each is interpreted as a byte of data and assigned, from left to right, to the four bytes of an Internet address. When three parts are specified, the last part is interpreted as a 16-bit quantity and placed in the rightmost two bytes of the network address. This format is convenient for specifying Class B network addresses as 128.net.host. When two parts are specified, the last part is interpreted as a 24-bit quantity and placed in the rightmost three bytes of the network address. This format is convenient for specifying Class A network addresses as net.host. When only one part is specified, the value is stored directly in the network address without any byte rearrangement.

All numbers supplied as parts in dot notation can be decimal, octal, or hexadecimal, as specified in the ISO C standard. A leading 0x or 0X implies hexadecimal and a leading 0 implies octal. Otherwise, the number is interpreted as decimal.  

NOTES

The dot-formatted network-address a.b.c.d is returned as the machine integer dcba.  

RETURN VALUES

Upon successful completion, the inet_addr() function returns an equivalent network byte-ordered address integer. Otherwise, it returns (in_addr_t)-1.  

ERRORS

Current industry standards for inet_addr() do not define error values.  

RELATED INFORMATION

Functions: inet_netof(3), inet_lnaof(3), inet_makeaddr(3), inet_network(3), inet_ntoa(3)

Standards: standards(5)

Network Programmer's Guide delim off


 

Index

NAME
LIBRARY
SYNOPSIS
STANDARDS
PARAMETERS
DESCRIPTION
NOTES
RETURN VALUES
ERRORS
RELATED INFORMATION

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Time: 02:41:41 GMT, October 02, 2010