getservent(SLIB)               6 January 1993               getservent(SLIB)


 Name

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

 Syntax


    #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

    getservent, getservbyname, and getservbyport each returns 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:

    sname      The official name of the service.

    saliases   A zero-terminated list of alternate names for the service.

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

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

    getservent reads the next line of the file, opening the file if neces-
    sary.

    setservent opens and rewinds the file.  If the stayopen flag is non-zero,
    the network 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.

 Files

    /etc/services

 Diagnostics

    Null pointer (0) returned on EOF or error.

 Notes

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

 See also

    getprotoent(SLIB) and services(SFF).