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#include <netdb.h>
The <netdb.h> header defines the type in_port_t and the type in_addr_t as described in in.h(3HEAD).
The <netdb.h> header defines the hostent structure that includes the following members:
char *h_name /* official name of the host */ char **h_aliases /* pointer to an array of pointers to alternative host names, terminated by a null pointer */ int h_addrtype /* address type */ int h_length /* length, in bytes, of the address */ char **h_addr_list /* pointer to an array of pointers to network addresses (in network byte order)for the host, terminated by a null pointer */
The <netdb.h> header defines the netent structure that includes the following members:
char *n_name /* official, fully-qualified */ (including the domain) name of the network */ char **n_aliases /* pointer to an array of pointers to alternative network names, terminated */ by a null pointer */ int n_addrtype /* the address type of the network */ in_addr_t n_net /* the network number, in host byte order */
The <netdb.h> header defines the protoent structure that includes the following members:
char *p_name /* official name of the protocol */ char **p_aliases /* pointer to an array of pointers to alternative protocol names, terminated by a null pointer */ int p_proto /* protocol number */
The <netdb.h> header defines the servent structure that includes the following members:
char *s_name /* oficial name of the service */ char **s_aliases /* pointer to an array of pointers to alternativeservice names, terminated by a null pointer */ int s_port /* port number at which the service resides, in network byte order */ char *s_proto /* name of the protocol to use when contacting the service */
The <netdb.h> header defines the macro IPPORT_RESERVED with the value of the highest reserved Internet port number.
The <netdb.h> header provides a declaration for h_errno:
extern int h_errno;
The <netdb.h> header defines the following macros for use as error values for gethostbyaddr() and gethostbyname():
| HOST_NOT_FOUND | NO_DATA |
| NO_RECOVERY | TRY_AGAIN |
Inclusion of the <netdb.h> header may also make visible all symbols from in.h(3HEAD).
See attributes(5) for descriptions of the following attributes:
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
| Interface Stability | Standard |
Intro(3), endhostent(3NSL), endhostent(3XNET), endnetent(3SOCKET), endnetent(3XNET), endprotoent(3SOCKET), endprotoent(3XNET), endservent(3SOCKET), endservent(3XNET), in.h(3HEAD), attributes(5), standards(5)