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BLUETOOTH(3) Library Functions Manual BLUETOOTH(3)

bt_gethostbyname, bt_gethostbyaddr, bt_gethostent, bt_sethostent, bt_endhostent, bt_getprotobyname, bt_getprotobynumber, bt_getprotoent, bt_setprotoent, bt_endprotoent, bt_aton, bt_ntoa, bt_devaddr, bt_devname — Bluetooth routines

library “libbluetooth”

#include <bluetooth.h>

struct hostent *
bt_gethostbyname(const char *name);

struct hostent *
bt_gethostbyaddr(const void *addr, socklen_t 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);

int
bt_devaddr(const char *name, bdaddr_t *addr);

int
bt_devname(char *name, const bdaddr_t *addr);

The (), bt_gethostbyname(), and bt_gethostbyaddr() functions each return a pointer to an object with the hostent structure describing a Bluetooth host referenced by name or by address, respectively.

The name argument passed to () should point to a NUL-terminated hostname. The addr argument passed to () should point to an address which is len bytes long, in binary 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 () 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 () function closes the /etc/bluetooth/hosts file.

The (), bt_getprotobyname(), and bt_getprotobynumber() functions each return a pointer to an object with the protoent structure describing a Bluetooth Protocol Service Multiplexor referenced by name or number, respectively.

The name argument passed to () should point to a NUL-terminated Bluetooth Protocol Service Multiplexor name. The proto argument passed to () 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 () 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 () function closes the /etc/bluetooth/protocols file.

The () 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 () 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 an internal static buffer will be used.

The () function interprets the specified character string as the address or device name of a Bluetooth device on the local system, and places the device address in the structure provided, if any. It returns 1 if the string was successfully interpreted, or 0 if the string did not match any local device. The () function takes a Bluetooth device address and copies the local device name associated with that address into the buffer provided, if any. It returns 1 when the device was found, otherwise 0.

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

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(&bd, sizeof(bd),
    AF_BLUETOOTH)) == NULL)
	errx(1, "no name associated with %s", bdstr);

printf("name associated with %s is %s\n", bdstr, hp->h_name);

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:

No such host is known.
Some unexpected server failure was encountered. This is a non-recoverable error.

The bt_getprotoent(), bt_getprotobyname(), and bt_getprotobynumber() return NULL on EOF or error.

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

libbluetooth first appeared in FreeBSD was ported to NetBSD 4.0 and extended by Iain Hibbert for Itronix, Inc. libbluetooth was imported into DragonFly 1.11.

Maksim Yevmenkin <m_evmenkin@yahoo.com>
Iain Hibbert

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.

These functions use static data storage; if the data is needed for future use, it should be copied before any subsequent calls overwrite it.

July 26, 2006 DragonFly-5.6.1