struct servent *
getservent()
struct servent *
getservbyname(const char *name, const char *proto)
struct servent *
getservbyport(int port, const char *proto)
void
setservent(int stayopen)
void
endservent(void)
),
getservbyname(),
and
getservbyport()
functions
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 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_names_aliasess_ports_proto
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 net data base 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 is found,
or until
EOF
is encountered.
If a protocol name is also supplied (non-NULL),
searches must also match the protocol.
/etc/servicesEOF
or error.
),
getservbyport(),
getservbyname(),
setservent(),
and
endservent()
functions appeared in
4.2BSD.