getservent, getservbyport, getservbyname, setservent,  endservent  -  get
     service entry

     #include <netdb.h>

     struct servent *getservent()

     struct servent *getservbyname(name, proto) char *name, *proto;

     struct servent *getservbyport(port, proto) int port; char *proto;

     setservent(stayopen) int stayopen


     Getservent, getservbyname, and getservbyport each return a pointer to  an
     object with the following structure containing the broken-out fields of a
     line in the network services data base, /etc/services.

     struct  servent {
             char    *s_name; /* official name of service */
             char    **s_aliases; /* alias list */
             int     s_port;         /* port service resides at */
             char    *s_proto; /* protocol to use */

     The members of this structure are:

     s_name     The official name of the service.

     s_aliases  A zero terminated list of alternate names for the service.

     s_port     The port number at which the service  resides.   Port  numbers
                are returned in network byte order.

     s_proto    The name of the protocol to use when contacting the service.

     Getservent reads  the  next  line  of  the  file,  opening  the  file  if

     Setservent opens and rewinds the file.  If the stayopen flag is non-zero,
     the  net data base will not be closed after each call to getservbyname or

     Endservent closes the file.

     Getservbyname and getservbyport sequentially search from the beginning of
     the file until a matching protocol name or port number is found, or until
     EOF is encountered.  If a protocol  name  is  also  supplied  (non-NULL),
     searches must also match the protocol.


     getprotoent(3), services(5)

     Null pointer (0) returned on EOF or error.

     All information is contained in a static area so it must be copied if  it
     is  to  be  saved.  Expecting port numbers to fit in a 32 bit quantity is
     probably naive.