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!!NAME inet_aton, inet_addr, inet_network, inet_ntoa, inet_makeaddr, inet_lnaof, inet_netof - Internet address manipulation routines !!SYNOPSIS __#include <sys/socket.h>__ __#include <netinet/in.h>__ __#include <arpa/inet.h>__ __int inet_aton(const char *__''cp''__, struct in_addr *__''inp''__);__ __in_addr_t inet_addr(const char *__''cp''__);__ __in_addr_t inet_network(const char *__''cp''__);__ __char *inet_ntoa(struct in_addr __''in''__);__ __struct in_addr inet_makeaddr(int __''net''__, int __''host''__);__ __in_addr_t inet_lnaof(struct in_addr __''in''__);__ __in_addr_t inet_netof(struct in_addr __''in''__);__ !!DESCRIPTION inet_aton(3) converts the Internet host address ''cp'' from the standard numbers-and-dots notation into binary data and stores it in the structure that ''inp'' points to. inet_aton(3) returns nonzero if the address is valid, zero if not. The inet_addr(3) function converts the Internet host address ''cp'' from numbers-and-dots notation into binary data in network byte order. If the input is invalid, INADDR_NONE (usually -1) is returned. This is an ''obsolete'' interface to __inet_aton__, described immediately above; it is obsolete because -1 is a valid address (255.255.255.255), and inet_aton(3) provides a cleaner way to indicate error return. The inet_network(3) function extracts the network number in host byte order from the address ''cp'' in numbers-and-dots notation. If the input is invalid, -1 is returned. The inet_ntoa(3) function converts the Internet host address ''in'' given in network byte order to a string in standard numbers-and-dots notation. The string is returned in a statically allocated buffer, which subsequent calls will overwrite. ** Valgrind reports a memory leak when using this function. No solution has as of yet been found. The inet_makeaddr(3) function makes an Internet host address in network byte order by combining the network number ''net'' with the local address ''host'' in network ''net'', both in local host byte order. The inet_lnaof(3) function returns the local host address part of the Internet address ''in''. The local host address is returned in local host byte order. The inet_netof(3) function returns the network number part of the Internet Address ''in''. The network number is returned in local host byte order. The structure ''in_addr'' as used in inet_ntoa(3), inet_makeaddr(3), inet_lnoaf(3) and inet_netof(3) is defined in ''netinet/in.h'' as: struct in_addr { unsigned long int s_addr; } Note that on the i80x86 the host byte order is Least Significant Byte first, whereas the network byte order, as used on the Internet, is Most Significant Byte first. !!CONFORMING TO BSD 4.3 !!SEE ALSO gethostbyname(3), getnetent(3), inet_ntop(3), inet_pton(3), hosts(5), networks(5)
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