MirOS Manual: endservent(3), endservent_r(3), getservbyname(3), getservbyname_r(3), getservbyport(3), getservbyport_r(3), getservent(3), getservent_r(3), setservent(3), setservent_r(3)

GETSERVENT(3)              BSD Programmer's Manual               GETSERVENT(3)

NAME

     getservent, getservent_r, getservbyport, getservbyport_r, getservbyname,
     getservbyname_r, setservent, setservent_r, endservent, endservent_r - get
     service entry

SYNOPSIS

     #include <netdb.h>

     struct servent *
     getservent(void);

     int
     getservent_r(struct servent *servent, struct servent_data *servent_data);

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

     int
     getservbyname_r(const char *name, const char *proto,
             struct servent *servent, struct servent_data *servent_data);

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

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

     void
     setservent(int stayopen);

     void
     setservent_r(int stayopen, struct servent_data *servent_data);

     void
     endservent(void);

     void
     endservent_r(struct servent_data *servent_data);

DESCRIPTION

     The getservent(), getservbyname(), and getservbyport() functions each re-
     turn a pointer to an object with the following structure containing the
     broken-out fields of a line in the network services database,
     /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 null-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() function reads the next line of the file, opening the
     file if necessary.

     The setservent() function opens and rewinds the file. If the stayopen
     flag is non-zero, the services database will not be closed after each
     call to getservbyname() or getservbyport().

     The endservent() function closes the file.

     The getservbyname() and getservbyport() functions sequentially search
     from the beginning of the file until a matching protocol name or port
     number (specified in network byte order) is found, or until EOF is en-
     countered. If a protocol name is also supplied (non-null), searches must
     also match the protocol.

     The getservent_r(), getservbyport_r(), getservbyname_r(), setservent_r(),
     and endservent_r() functions are reentrant versions of the above func-
     tions that take a pointer to a servent_data structure which is used to
     store state information. The structure must be zero-filled before it is
     used and should be considered opaque for the sake of portability.

     The getservent_r(), getservbyport_r(), and getservbyname_r() functions
     also take a pointer to a servent structure which is used to store the
     results of the database lookup.

RETURN VALUES

     The getservent(), getservbyport(), and getservbyname() functions return a
     pointer to a servent structure on success or a null pointer if end-of-
     file is reached or an error occurs.

     The getservent_r(), getservbyport_r(), and getservbyname_r() functions
     return 0 on success or -1 if end-of-file is reached or an error occurs.

FILES

     /etc/services

SEE ALSO

     getprotoent(3), services(5)

STANDARDS

     The getservent(), getservbynumber(), getservbyname(), setservent(), and
     endservent() functions conform to IEEE Std 1003.1-2004 ("POSIX").

     The getservent_r(), getservbyport_r(), getservbyname_r(), setservent_r(),
     and endservent_r() functions are not currently standardized. This imple-
     mentation follows the API used by HP, IBM, and Digital.

HISTORY

     The getservent(), getservbyport(), getservbyname(), setservent(), and
     endservent() functions appeared in 4.2BSD.

     The getservent_r(), getservbyport_r(), getservbyname_r(), setservent_r(),
     and endservent_r() functions appeared in OpenBSD 3.7.

BUGS

     The non-reentrant functions use static data storage; if the data is need-
     ed for future use, it should be copied before any subsequent calls
     overwrite it. Expecting port numbers to fit in a 32-bit quantity is prob-
     ably naive.

MirOS BSD #10-current          October 13, 2004                              1

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