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.
This page is part of release 3.27 of the Linux
man-pages
project.
A description of the project,
and information about reporting bugs,
can be found at
http://www.kernel.org/doc/man-pages/.