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$Id: bluetooth.3,v 1.5 2003/05/20 23:04:30 max Exp $
$FreeBSD: releng/10.2/lib/libbluetooth/bluetooth.3 235286 2012-05-11 20:06:46Z gjb $
.Dd April 9, 2009 .Dt BLUETOOTH 3 .Os .Sh NAME .Nm bt_gethostbyname , .Nm bt_gethostbyaddr , .Nm bt_gethostent , .Nm bt_sethostent , .Nm bt_endhostent , .Nm bt_getprotobyname , .Nm bt_getprotobynumber , .Nm bt_getprotoent , .Nm bt_setprotoent , .Nm bt_endprotoent , .Nm bt_aton , .Nm bt_ntoa , .Nm bt_devaddr , .Nm bt_devname , .Nm bt_devinfo , .Nm bt_devenum , .Nm bt_devopen , .Nm bt_devclose , .Nm bt_devsend , .Nm bt_devrecv , .Nm bt_devreq , .Nm bt_devfilter , .Nm bt_devfilter_pkt_set , .Nm bt_devfilter_pkt_clr , .Nm bt_devfilter_pkt_tst , .Nm bt_devfilter_evt_set , .Nm bt_devfilter_evt_clr , .Nm bt_devfilter_evt_tst , .Nm bt_devinquiry , .Nm bdaddr_same , .Nm bdaddr_any , .Nm bdaddr_copy .Nd Bluetooth routines .Sh LIBRARY .Lb libbluetooth .Sh SYNOPSIS n bluetooth.h .Ft struct hostent * .Fn bt_gethostbyname "const char *name" .Ft struct hostent * .Fn bt_gethostbyaddr "const char *addr" "int len" "int type" .Ft struct hostent * .Fn bt_gethostent void .Ft void .Fn bt_sethostent "int stayopen" .Ft void .Fn bt_endhostent void .Ft struct protoent * .Fn bt_getprotobyname "const char *name" .Ft struct protoent * .Fn bt_getprotobynumber "int proto" .Ft struct protoent * .Fn bt_getprotoent void .Ft void .Fn bt_setprotoent "int stayopen" .Ft void .Fn bt_endprotoent void .Ft int .Fn bt_aton "const char *str" "bdaddr_t *ba" .Ft const char * .Fn bt_ntoa "const bdaddr_t *ba" "char *str" .Ft int .Fn bt_devaddr "const char *devname" "bdaddr_t *addr" .Ft int .Fn bt_devname "char *devname" "const bdaddr_t *addr" .Ft int .Fn (bt_devenum_cb_t) "int s" "struct bt_devinfo const *di" "void *arg" .Ft int .Fn bt_devinfo "struct bt_devinfo *di" .Ft int .Fn bt_devenum "bt_devenum_cb_t *cb" "void *arg" .Ft int .Fn bt_devopen "char const *devname" .Ft int .Fn bt_devclose "int s" .Ft int .Fn bt_devsend "int s" "uint16_t opcode" "void *param" "size_t plen" .Ft ssize_t .Fn bt_devrecv "int s" "void *buf" "size_t size" "time_t to" .Ft int .Fn bt_devreq "int s" "struct bt_devreq *r" "time_t to" .Ft int .Fn bt_devfilter "int s" "struct bt_devfilter const *new" "struct bt_devfilter *old" .Ft void .Fn bt_devfilter_pkt_set "struct bt_devfilter *filter" "uint8_t type" .Ft void .Fn bt_devfilter_pkt_clt "struct bt_devfilter *filter" "uint8_t type" .Ft int .Fn bt_devfilter_pkt_tst "struct bt_devfilter const *filter" "uint8_t type" .Ft void .Fn bt_devfilter_evt_set "struct bt_devfilter *filter" "uint8_t event" .Ft void .Fn bt_devfilter_evt_clt "struct bt_devfilter *filter" "uint8_t event" .Ft int .Fn bt_devfilter_evt_tst "struct bt_devfilter const *filter" "uint8_t event" .Ft int .Fn bt_devinquiry "char const *devname" "time_t length" "int num_rsp" "struct bt_devinquiry **ii" .Ft int .Fn bdaddr_same "const bdaddr_t *a" "const bdaddr_t *b" .Ft int .Fn bdaddr_any "const bdaddr_t *a" .Ft int .Fn bdaddr_copy "const bdaddr_t *dst" "const bdaddr_t *src" .Sh DESCRIPTION The .Fn bt_gethostent , .Fn bt_gethostbyname and .Fn bt_gethostbyaddr functions each return a pointer to an object with the .Vt hostent structure describing a Bluetooth host referenced by name or by address, respectively.
p The .Fa name argument passed to .Fn bt_gethostbyname should point to a .Dv NUL Ns -terminated hostname. The .Fa addr argument passed to .Fn bt_gethostbyaddr should point to an address which is .Fa len bytes long, in binary form (i.e., not a Bluetooth BD_ADDR in human readable .Tn ASCII form). The .Fa type argument specifies the address family of this address and must be set to .Dv AF_BLUETOOTH .
p The structure returned contains the information obtained from a line in
p The .Fn bt_sethostent function controls whether
a /etc/bluetooth/hosts file should stay open after each call to .Fn bt_gethostbyname or .Fn bt_gethostbyaddr . If the .Fa stayopen flag is non-zero, the file will not be closed.
p The .Fn bt_endhostent function closes the
p The .Fn bt_getprotoent , .Fn bt_getprotobyname and .Fn bt_getprotobynumber functions each return a pointer to an object with the .Vt protoent structure describing a Bluetooth Protocol Service Multiplexor referenced by name or number, respectively.
p The .Fa name argument passed to .Fn bt_getprotobyname should point to a .Dv NUL Ns -terminated Bluetooth Protocol Service Multiplexor name. The .Fa proto argument passed to .Fn bt_getprotobynumber should have numeric value of the desired Bluetooth Protocol Service Multiplexor.
p The structure returned contains the information obtained from a line in
a /etc/bluetooth/protocols file.
p The .Fn bt_setprotoent function controls whether
a /etc/bluetooth/protocols file should stay open after each call to .Fn bt_getprotobyname or .Fn bt_getprotobynumber . If the .Fa stayopen flag is non-zero, the file will not be closed.
p The .Fn bt_endprotoent function closes the
a /etc/bluetooth/protocols file.
p The .Fn 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.
p The routine .Fn bt_ntoa takes a Bluetooth address and places an .Tn 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.
p The .Fn bt_devaddr function interprets the specified .Fa devname string as the address or device name of a Bluetooth device on the local system, and places the device address in the provided .Fa bdaddr , if any. The function returns 1 if the string was successfully interpreted, or 0 if the string did not match any local device. The .Fn bt_devname function takes a Bluetooth device address and copies the local device name associated with that address into the buffer provided, if any. Caller must ensure that provided buffer is at least .Dv HCI_DEVNAME_SIZE characters in size. The function returns 1 when the device was found, otherwise 0.
p The .Fn bt_devinfo function populates provided .Vt bt_devinfo structure with the information about given Bluetooth device. The caller is expected to pass Bluetooth device name in the .Fa devname field of the passed .Vt bt_devinfo structure. The function returns 0 when successful, otherwise -1. The .Vt bt_devinfo structure is defined as follows d -literal -offset indent struct bt_devinfo { char devname[HCI_DEVNAME_SIZE]; uint32_t state; bdaddr_t bdaddr; uint16_t _reserved0; uint8_t features[HCI_DEVFEATURES_SIZE]; /* buffer info */ uint16_t _reserved1; uint16_t cmd_free; uint16_t sco_size; uint16_t sco_pkts; uint16_t sco_free; uint16_t acl_size; uint16_t acl_pkts; uint16_t acl_free; /* stats */ uint32_t cmd_sent; uint32_t evnt_recv; uint32_t acl_recv; uint32_t acl_sent; uint32_t sco_recv; uint32_t sco_sent; uint32_t bytes_recv; uint32_t bytes_sent; /* misc/specific */ uint16_t link_policy_info; uint16_t packet_type_info; uint16_t role_switch_info; uint16_t debug; uint8_t _padding[20]; }; .Ed
p The .Fn bt_devenum function enumerates Bluetooth devices present in the system. For every device found, the function will call provided .Fa cb callback function which should be of .Vt bt_devenum_cb_t type. The callback function is passed a .Dv HCI socket .Fa s , fully populated .Vt bt_devinfo structure .Fa di and .Fa arg argument provided to the .Fn bt_devenum . The callback function can stop enumeration by returning a value that is greater than zero. The function returns number of successfully enumerated devices, or -1 if an error occurred.
p The .Fn bt_devopen function opens a Bluetooth device with the given .Fa devname and returns a connected and bound .Dv HCI socket handle. The function returns -1 if an error has occurred.
p The .Fn bt_devclose closes the passed .Dv HCI socket handle .Fa s , previously obtained with .Xr bt_devopen 3 .
p The .Fn bt_devsend function sends a Bluetooth .Dv HCI command with the given .Fa opcode to the provided socket .Fa s , previously obtained with .Xr bt_devopen 3 . The .Fa opcode parameter is expected to be in the host byte order. The .Fa param and .Fa plen parameters specify command parameters. The .Fn bt_devsend function does not modify the .Dv HCI filter on the provided socket .Fa s . The function returns 0 on success, or -1 if an error occurred.
p The .Fn bt_devrecv function receives one Bluetooth .Dv HCI packet from the socket .Fa s , previously obtained with .Xr bt_devopen 3 . The packet is placed into the provided buffer .Fa buf of size .Fa size . The .Fa to parameter specifies receive timeout in seconds. Infinite timeout can be specified by passing negative value in the .Fa to parameter. The .Fn bt_devrecv function does not modify the .Dv HCI filter on the provided socket .Fa s . The function returns total number of bytes received, or -1 if an error occurred.
p The .Fn bt_devreq function makes a Bluetooth .Dv HCI request to the socket .Fa s , previously obtained with .Xr bt_devopen 3 . The function will send the specified command and will wait for the specified event, or timeout .Fa to seconds to occur. The .Vt bt_devreq structure is defined as follows d -literal -offset indent struct bt_devreq { uint16_t opcode; uint8_t event; void *cparam; size_t clen; void *rparam; size_t rlen; }; .Ed
p The .Fa opcode field specifies the command and is expected to be in the host byte order. The .Fa cparam and .Fa clen fields specify command parameters data and command parameters data size respectively. The .Fa event field specifies which Bluetooth .Dv HCI event ID the function should wait for, otherwise it should be set to zero. The .Dv HCI Command Complete and Command Status events are enabled by default. The .Fa rparam and .Fa rlen parameters specify buffer and buffer size respectively where return parameters should be placed. The .Fn bt_devreq function temporarily modifies filter on the provided .Dv HCI socket .Fa s . The function returns 0 on success, or -1 if an error occurred.
p The .Fn bt_devfilter controls the local .Dv HCI filter associated with the socket .Fa s , previously obtained with .Xr bt_devopen 3 . Filtering can be done on packet types, i.e. .Dv ACL , .Dv SCO or .Dv HCI , command and event packets, and, in addition, on .Dv HCI event IDs. Before applying the .Fa new filter (if provided) the function will try to obtain the current filter from the socket .Fa s and place it into the .Fa old parameter (if provided). The function returns 0 on success, or -1 if an error occurred.
p The .Fn bt_devfilter_pkt_set , .Fn bt_devfilter_pkt_clr and .Fn bt_devfilter_pkt_tst functions can be used to modify and test the .Dv HCI filter .Fa filter . The .Fa type parameter specifies .Dv HCI packet type.
p The .Fn bt_devfilter_evt_set , .Fn bt_devfilter_evt_clr and .Fn bt_devfilter_evt_tst functions can be used to modify and test the .Dv HCI event filter .Fa filter . The .Fa event parameter specifies .Dv HCI event ID.
p The .Fn bt_devinquiry function performs Bluetooth inquiry. The .Fa devname parameter specifies which local Bluetooth device should perform an inquiry. If not specified, i.e. .Dv NULL , then first available device will be used. The .Fa length parameters specifies the total length of an inquiry in seconds. If not specified, i.e. 0, default value will be used. The .Fa num_rsp parameter specifies the number of responses that can be received before the inquiry is halted. If not specified, i.e. 0, default value will be used. The .Fa ii parameter specifies where to place inquiry results. On success, the function will return total number of inquiry results, will allocate, using .Xr calloc 3 , buffer to store all the inquiry results and will return pointer to the allocated buffer in the .Fa ii parameter. It is up to the caller of the function to dispose of the buffer using .Xr free 3 call. The function returns -1 if an error has occurred. The .Vt bt_devinquiry structure is defined as follows d -literal -offset indent struct bt_devinquiry { bdaddr_t bdaddr; uint8_t pscan_rep_mode; uint8_t pscan_period_mode; uint8_t dev_class[3]; uint16_t clock_offset; int8_t rssi; uint8_t data[240]; }; .Ed
p The .Fn bdaddr_same , .Fn bdaddr_any and .Fn bdaddr_copy are handy shorthand Bluetooth address utility functions. The .Fn bdaddr_same function will test if two provided BD_ADDRs are the same. The .Fn bdaddr_any function will test if provided BD_ADDR is .Dv ANY BD_ADDR. The .Fn bdaddr_copy function will copy provided .Fa src BD_ADDR into provided .Fa dst BD_ADDR. .Sh FILES l -tag -width ".Pa /etc/bluetooth/hosts" -compact t Pa /etc/bluetooth/hosts t Pa /etc/bluetooth/protocols .El .Sh EXAMPLES Print out the hostname associated with a specific BD_ADDR: d -literal -offset indent 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 %s\en", bdstr, hp->h_name); .Ed .Sh DIAGNOSTICS Error return status from .Fn bt_gethostent , .Fn bt_gethostbyname and .Fn bt_gethostbyaddr is indicated by return of a .Dv NULL pointer. The external integer .Va h_errno may then be checked to see whether this is a temporary failure or an invalid or unknown host. The routine .Xr herror 3 can be used to print an error message describing the failure. If its argument .Fa string is
f non- Dv NULL , it is printed, followed by a colon and a space. The error message is printed with a trailing newline.
p The variable .Va h_errno can have the following values: l -tag -width ".Dv HOST_NOT_FOUND" t Dv HOST_NOT_FOUND No such host is known. t Dv NO_RECOVERY Some unexpected server failure was encountered. This is a non-recoverable error. .El
p The .Fn bt_getprotoent , .Fn bt_getprotobyname and .Fn bt_getprotobynumber return .Dv NULL on EOF or error. .Sh SEE ALSO .Xr gethostbyaddr 3 , .Xr gethostbyname 3 , .Xr getprotobyname 3 , .Xr getprotobynumber 3 , .Xr herror 3 , .Xr inet_aton 3 , .Xr inet_ntoa 3 , .Xr ng_hci 4 .Sh CAVEAT The .Fn bt_gethostent function reads the next line of
a /etc/bluetooth/hosts , opening the file if necessary.
p The .Fn bt_sethostent function opens and/or rewinds the
p The .Fn bt_getprotoent function reads the next line of
a /etc/bluetooth/protocols , opening the file if necessary.
p The .Fn bt_setprotoent function opens and/or rewinds the
a /etc/bluetooth/protocols file.
p The .Fn bt_devenum function enumerates up to .Dv HCI_DEVMAX Bluetooth devices. During enumeration the .Fn bt_devenum function uses the same .Dv HCI socket. The function guarantees that the socket, passed to the callback function, will be bound and connected to the Bluetooth device being enumerated. .Sh AUTHORS .An Maksim Yevmenkin Aq m_evmenkin@yahoo.com .Sh BUGS Some of those functions use static data storage; if the data is needed for future use, it should be copied before any subsequent calls overwrite it.