Headers                                            netdb.h(3HEAD)



NAME
     netdb.h, netdb - definitions for network database operations

SYNOPSIS
     #include 


DESCRIPTION
     The  header defines the type inportt and the type
     inaddrt as described in in.h(3HEAD).


     The  header  defines  the  hostent  structure  that
     includes the following members:

       char *hname          /* official name of the host */
       char **haliases      /* pointer to an array of pointers to
                                alternative host names, terminated
                                by a null pointer */
       int  haddrtype       /* address type */
       int  hlength         /* length, in bytes, of the address */
       char **haddrlist    /* pointer to an array of pointers to
                                network addresses (in network byte
                                order)for the host, terminated by a
                                null pointer */



     The   header  defines  the  netent  structure  that
     includes the following members:

       char      *nname     /* official, fully-qualified */
                                (including the domain) name
                                of the network */
       char      **naliases /* pointer to an array of pointers to
                                alternative network names, terminated */
                                by a null pointer */
       int       naddrtype  /* the address type of the network */
       inaddrt nnet       /* the network number, in host byte order */



     The  header defines  the  protoent  structure  that
     includes the following members:

       char *pname         /* official name of the protocol */
       char **paliases     /* pointer to an array of pointers to
                               alternative protocol names, terminated
                               by a null pointer */
       int  pproto         /* protocol number */





SunOS 5.11          Last change: 10 Sep 2004                    1






Headers                                            netdb.h(3HEAD)



     The  header  defines  the  servent  structure  that
     includes the following members:

       char *sname         /* oficial name of the service */
       char **saliases     /* pointer to an array of pointers to
                               alternativeservice names, terminated by
                               a null pointer */
       int  sport          /* port number at which the service
                               resides, in network byte order */
       char *sproto        /* name of the protocol to use when
                               contacting the service */



     The  header defines the macro IPORTRESERVED  with
     the value of the highest reserved Internet port number.


     The  header provides a declaration for herrno:


     extern int herrno;


     The  header defines the following macros for use as
     error values for gethostbyaddr() and gethostbyname():



     HOSTNOTFOUND      NODATA
     NORECOVERY         TRYAGAIN



     Inclusion of the  header may also make visible  all
     symbols from in.h(3HEAD).

ATRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:



     
           ATRIBUTE TYPE               ATRIBUTE VALUE       
    
     Interface Stability          Standard                    
    


SEE ALSO




SunOS 5.11          Last change: 10 Sep 2004                    2






Headers                                            netdb.h(3HEAD)



     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)



















































SunOS 5.11          Last change: 10 Sep 2004                    3