● sockaddr

#include

struct sockaddr

{

sa_family_t sa_family;

char sa_data[14];

};

● in_addr_t

#include

/* Internet address. */

typedef uint32_t in_addr_t;

struct in_addr

{

in_addr_t s_addr;

};

● in_port_t

#include

/* Type to represent a port. */

typedef uint16_t in_port_t;

● sockaddr_in

#include

struct sockaddr_in

{

sa_family_t sin_family;

in_port_t sin_port;

struct in_addr sin_addr;

unsigned char sin_zero[sizeof (struct sockaddr) -

(sizeof (unsigned short int)) -

sizeof (in_port_t) -

sizeof (struct in_addr)];

};

● addrinfo, servent, protoent, netent, hostent

/* Structure to contain information about address of a service provider. */

struct addrinfo

{

int ai_flags;/* Input flags. */

int ai_family;/* Protocol family for socket. */

int ai_socktype;/* Socket type. */

int ai_protocol;/* Protocol for socket. */

socklen_t ai_addrlen;/* Length of socket address. */

struct sockaddr *ai_addr;/* Socket address for socket. */

char *ai_canonname;/* Canonical name for service location. */

struct addrinfo *ai_next;/* Pointer to next in list. */

};

/* Description of data base entry for a single service. */

struct servent

{

char *s_name;/* Official service name. */

char **s_aliases;/* Alias list. */

int s_port;/* Port number. */

char *s_proto;/* Protocol to use. */

};

/* Description of data base entry for a single service. */

struct protoent

{

char *p_name;/* Official protocol name. */

char **p_aliases;/* Alias list. */

int p_proto;/* Protocol number. */

};

/* Description of data base entry for a single network. NOTE: here a

poor assumption is made. The network number is expected to fit

into an unsigned long int variable. */

struct netent

{

char *n_name;/* Official name of network. */

char **n_aliases;/* Alias list. */

int n_addrtype;/* Net address type. */

uint32_t n_net;/* Network number. */

};

/* Description of data base entry for a single host. */

struct hostent

{

char *h_name;/* Official name of host. */

char **h_aliases;/* Alias list. */

int h_addrtype;/* Host address type. */

int h_length;/* Length of address. */

char **h_addr_list;/* List of addresses from name server. */

#if defined __USE_MISC || defined __USE_GNU

# defineh_addrh_addr_list[0] /* Address, for backward compatibility.*/

#endif

};

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