bluetooth(3)

NAME

bt_gethostbyname, bt_gethostbyaddr, bt_gethostent,

bt_sethostent,
bt_endhostent, bt_getprotobyname, bt_getprotobynumber,

bt_getprotoent,
bt_setprotoent, bt_endprotoent, bt_aton, bt_ntoa - Bluetooth

routines

LIBRARY

library ``libbluetooth''

SYNOPSIS

#include <bluetooth.h>
struct hostent *
bt_gethostbyname(const char *name);
struct hostent *
bt_gethostbyaddr(const char *addr, int len, int type);
struct hostent *
bt_gethostent(void);
void
bt_sethostent(int stayopen);
void
bt_endhostent(void);
struct protoent *
bt_getprotobyname(const char *name);
struct protoent *
bt_getprotobynumber(int proto);
struct protoent *
bt_getprotoent(void);
void
bt_setprotoent(int stayopen);
void
bt_endprotoent(void);
int
bt_aton(const char *str, bdaddr_t *ba);
const char *
bt_ntoa(const bdaddr_t *ba, char *str);

DESCRIPTION

The bt_gethostent(), bt_gethostbyname() and

bt_gethostbyaddr() functions
each return a pointer to an object with the hostent struc

ture describing
a Bluetooth host referenced by name or by address, respec

tively.

The name argument passed to bt_gethostbyname() should point

to a
NUL-terminated hostname. The addr argument passed to

bt_gethostbyaddr()
should point to an address which is len bytes long, in bina

ry form (i.e.,
not a Bluetooth BD_ADDR in human readable ASCII form). The

type argument
specifies the address family of this address and must be set

to
AF_BLUETOOTH.

The structure returned contains the information obtained

from a line in
/etc/bluetooth/hosts file.

The bt_sethostent() function controls whether

/etc/bluetooth/hosts file
should stay open after each call to bt_gethostbyname() or bt_gethostbyaddr(). If the stayopen flag is non-zero, the

file will not
be closed.

The bt_endhostent() function closes the /etc/bluetooth/hosts

file.

The bt_getprotoent(), bt_getprotobyname() and

bt_getprotobynumber() functions each return a pointer to an object with the protoent

structure
describing a Bluetooth Protocol Service Multiplexor refer

enced by name or
number, respectively.

The name argument passed to bt_getprotobyname() should point

to a
NUL-terminated Bluetooth Protocol Service Multiplexor name.

The proto
argument passed to bt_getprotobynumber() should have numeric

value of the
desired Bluetooth Protocol Service Multiplexor.

The structure returned contains the information obtained

from a line in
/etc/bluetooth/protocols file.

The bt_setprotoent() function controls whether

/etc/bluetooth/protocols
file should stay open after each call to bt_getprotobyname()

or
bt_getprotobynumber(). If the stayopen flag is non-zero,

the file will
not be closed.

The bt_endprotoent() function closes the

/etc/bluetooth/protocols file.

The bt_aton() routine interprets the specified character

string as a
Bluetooth address, placing the address into the structure

provided. It
returns 1 if the string was successfully interpreted, or 0

if the string
is invalid.

The routine bt_ntoa() takes a Bluetooth address and places

an ASCII
string representing the address into the buffer provided.

It is up to
the caller to ensure that provided buffer has enough space.

If no buffer
was provided then internal static buffer will be used.

FILES

/etc/bluetooth/hosts
/etc/bluetooth/protocols

EXAMPLES

Print out the hostname associated with a specific BD_ADDR:

const char *bdstr = "00:01:02:03:04:05";
bdaddr_t bd;
struct hostent *hp;

if (!bt_aton(bdstr, &bd))

errx(1, "can't parse BD_ADDR %s", bdstr);

if ((hp = bt_gethostbyaddr((const char *)&bd,

sizeof(bd), AF_BLUETOOTH)) == NULL)

errx(1, "no name associated with %s", bdstr);

printf("name associated with %s is %s0, bdstr,

hp->h_name);

DIAGNOSTICS

Error return status from bt_gethostent(), bt_gethostbyname()

and
bt_gethostbyaddr() is indicated by return of a NULL pointer.

The external integer h_errno may then be checked to see whether this

is a temporary failure or an invalid or unknown host. The routine

herror(3) can be
used to print an error message describing the failure. If

its argument
string is non-NULL, it is printed, followed by a colon and a

space. The
error message is printed with a trailing newline.

The variable h_errno can have the following values:

HOST_NOT_FOUND No such host is known.

NO_RECOVERY Some unexpected server failure was en

countered. This

is a non-recoverable error.

The bt_getprotoent(), bt_getprotobyname() and

bt_getprotobynumber()
return NULL on EOF or error.

SEE ALSO

gethostbyaddr(3), gethostbyname(3), getprotobyname(3),
getprotobynumber(3), herror(3), inet_aton(3), inet_ntoa(3)

CAVEAT

The bt_gethostent() function reads the next line of

/etc/bluetooth/hosts,
opening the file if necessary.

The bt_sethostent() function opens and/or rewinds the /etc/bluetooth/hosts file.

The bt_getprotoent() function reads the next line of /etc/bluetooth/protocols, opening the file if necessary.

The bt_setprotoent() function opens and/or rewinds the /etc/bluetooth/protocols file.

AUTHORS

Maksim Yevmenkin <m_evmenkin@yahoo.com>

BUGS

These functions use static data storage; if the data is

needed for future
use, it should be copied before any subsequent calls over

write it.

BSD May 7, 2003

BSD