getservent(3N)                   UNIX System V                   getservent(3N)


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

SYNOPSIS
      #include <netdb.h>
      struct servent *getservent(void);
      struct servent *getservbyname(char *name, *proto);
      struct servent *getservbyport(int port, char *proto);
      int setservent(int stayopen);
      int endservent(void);

DESCRIPTION
      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.

      The servent structure includes the following members:
            char   *sname;        /* official name of service */
            char   **saliases;    /* alias list */
            int    sport;         /* port service resides at */
            char   *sproto;       /* 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 short 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
      necessary.

      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 getservent
      (either directly, or indirectly through one of the other getserv calls).

      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.





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getservent(3N)                   UNIX System V                   getservent(3N)


FILES
      /etc/services

SEE ALSO
      getprotoent(3N), services(4)

DIAGNOSTICS
      A NULL pointer is 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.










































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