I would like to send a command OCF_LE_READ_CHANNEL_MAP to the hci
interface of an adapter using the hci library. To do this, I think I
need to open a socket connection to the hci interface of the adapter
and obtain the ACL connection handle. My question is, how do I obtain
the handle?
I try the following, but the ioctl returns -1 with error "File
descriptor in a bad state".
// find the connection handle to the specified bluetooth device
cr = (struct hci_conn_info_req*) malloc(
sizeof(struct hci_conn_info_req) +
sizeof(struct hci_conn_info));
bacpy( &cr->bdaddr, ba );
cr->type = ACL_LINK;
dd = hci_open_dev( hci_get_route( &cr->bdaddr ) );
if( dd < 0 ) {
err = dd;
goto cleanup;
}
err = ioctl(dd, HCIGETCONNINFO, (unsigned long) cr );
if( err ) {
// !!!This is where the program ends with "File descriptor in bad state"
perror("Failed to get connection info");
goto cleanup;
}
// build a command packet to send to the bluetooth microcontroller
cmd_param.handle = cr->conn_info->handle;
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