Network address database functionality. More...

#include <sys/cdefs.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <inttypes.h>

Data Structures
struct	hostent
	Network host entry. More...

struct	addrinfo
	Network address information structure. More...

Macros
#define	h_addr h_addr_list[0]
	Primary network address.

#define	HOST_NOT_FOUND 1
	Hostname not found.

#define	TRY_AGAIN 2
	Try the request again.

#define	NO_RECOVERY 3
	A non-recoverable error.

#define	NO_DATA 4
	Host found, but no data.

#define	EAI_AGAIN 1
	Try the request again.

#define	EAI_BADFLAGS 2
	Invalid hint flags.

#define	EAI_FAIL 3
	A non-recoverable error.

#define	EAI_FAMILY 4
	Invalid address family.

#define	EAI_MEMORY 5
	Memory allocation error.

#define	EAI_NONAME 6
	Hostname not found.

#define	EAI_SERVICE 7
	Invalid service value.

#define	EAI_SOCKTYPE 8
	Invalid socket type.

#define	EAI_SYSTEM 9
	System error, check errno.

#define	EAI_OVERFLOW 10
	Argument buffer overflow.

#define	AI_PASSIVE 0x00000001
	Address intended for bind().

#define	AI_CANONNAME 0x00000002
	Request canonical name.

#define	AI_NUMERICHOST 0x00000004
	Inhibit host resolution.

#define	AI_NUMERICSERV 0x00000008
	Inhibit service resolution.

#define	AI_V4MAPPED 0x00000010
	Return v4-mapped IPv6 addrs.

#define	AI_ALL 0x00000020
	Query for both IPv4 and IPv6.

#define	AI_ADDRCONFIG 0x00000040
	Only query for IPv4/IPv6 addrs the system has a valid addr.

Functions
void	freeaddrinfo (struct addrinfo *ai)
	Free an address information structure returned by getaddrinfo().

int	getaddrinfo (const char nodename, const char servname, const struct addrinfo hints, struct addrinfo *res)
	Get information about a specified address.

struct hostent *	gethostbyname (const char *name)
	Look up a host by its name.

struct hostent *	gethostbyname2 (const char *name, int af)
	Look up a host by its name and address family.

Variables
int	h_errno
	Error value for gethostbyname().

Detailed Description

Network address database functionality.

This file contains functions related to network address lookups, usually performed through DNS.

Macro Definition Documentation

#define h_addr h_addr_list[0]

Primary network address.