GETSERVENT(3N)          COMMAND REFERENCE          GETSERVENT(3N)



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

SYNOPSIS
     #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

     endservent()

DESCRIPTION
     The calls 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 service name */
               char **s_aliases;   /* alias list */
               int  s_port;        /* port # */
               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.

     The getservent call reads the next line of the file, opening
     the file /etc/services if necessary; the file remains open
     upon completion.



Printed 5/12/88                                                 1

GETSERVENT(3N)          COMMAND REFERENCE          GETSERVENT(3N)



     If the Yellow Pages aren't running, both getservbyname and
     getservbyport open the /etc/services file, if necessary,
     then 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.
     The /etc/services file is closed upon completion.  Port
     numbers are supplied in network byte order.

     The call setservent opens and rewinds the file.  If the
     stayopen flag is nonzero, the service data base will not be
     closed by subsequent calls to endservent (either directly,
     or indirectly through one of the other getserv calls);
     endservent closes the file.

FILES
     /etc/services
     /etc/yp/domainname/hosts.byname
     /etc/yp/domainname/hosts.byaddr

     The domainname is the name of your host (domain).

DIAGNOSTICS
     Null pointer (0) returned on EOF or error.

CAVEATS
     All information is contained in a static area so it must be
     copied if it is to be saved.

SEE ALSO
     getprotoent(3n), services(5n), and ypserv(8).
























Printed 5/12/88                                                 2

%%index%%
na:408,141;
sy:549,2364;
de:2913,1772;5165,1524;
fi:6689,352;
di:7041,171;
ca:7212,178;
se:7390,211;
%%index%%000000000134