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NAME

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

SYNOPSIS

       #include <netdb.h>

       struct servent *getservent(void);

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

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

       void setservent(int stayopen);

       void endservent(void);

DESCRIPTION

       The getservent() function  reads  the  next  entry  from  the  services
       database  (see  services(5)) and returns a servent structure containing
       the broken-out fields from the entry.  A connection is  opened  to  the
       database if necessary.

       The  getservbyname() function returns a servent structure for the entry
       from the database that matches the service name using  protocol  proto.
       If proto is NULL, any protocol will be matched.  A connection is opened
       to the database if necessary.

       The getservbyport() function returns a servent structure for the  entry
       from  the  database  that  matches the port port (given in network byte
       order) using protocol proto.  If proto is NULL, any  protocol  will  be
       matched.  A connection is opened to the database if necessary.

       The  setservent() function opens a connection to the database, and sets
       the next entry to the first entry.  If stayopen is  nonzero,  then  the
       connection  to  the database will not be closed between calls to one of
       the getserv*() functions.

       The endservent() function closes the connection to the database.

       The servent structure is defined in <netdb.h> as follows:

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

       The members of the servent structure are:

       s_name The official name of the service.

       s_aliases
              A NULL-terminated list of alternative names for the service.

       s_port The port number for the service given in network byte order.

       s_proto
              The name of the protocol to use with this service.

RETURN VALUE

       The getservent(), getservbyname() and getservbyport() functions  return
       a  pointer  to  a  statically  allocated  servent  structure, or a NULL
       pointer if an error occurs or the end of the file is reached.

FILES

       /etc/services
              services database file

CONFORMING TO

       4.3BSD, POSIX.1-2001.

SEE ALSO

       getnetent(3), getprotoent(3), getservent_r(3), services(5)

COLOPHON

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