[Bluez-users] Question re .bind() call on an RFCOMM socket

[Bluez-users] Question re .bind() call on an RFCOMM socket

[graeme.n.brown]

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Hi
 
 
I am trying to understand how bind() call to  BlueZ RFCOMM socket
behaves .
Code ...
 
SNIP...
#include <bluetooth/bluetooth.h>
#include <bluetooth/rfcomm.h>
 
int main ()
{
 
int sock ;
bdaddr_t    bdaddr ;
struct sockaddr_rc  loc_addr;
 
SNIP ...
 
/** Assume we have BT address of a local BT interface in bdaddr  **/
 
 If ((sock = socket(PF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM)) < 0) {
     printf("Cannot create socket: %s (errno: %d)\n", strerror(errno));
}
 
 
loc_addr.rc_family = AF_BLUETOOTH;
bacpy( &(loc_addr.rc_baddr), bdaddr);
 
/* Channel allocation */ 
loc_addr.rc_channel = 1;
 
/*** OR loc_addr.rc_channel = 0;  ???   <= What effect would this have
??? ***/
 
if ( bind(sock, (struct sockaddr *) &loc_addr, sizeof(loc_addr)) < 0 ) {
   printf("Cannot bind to  socket: %s (errno: %d)\n", strerror(errno));
   close(sock);
   exit -1 ;
}
 
snip ...
} 
 
 
If the loc_addr.rc_channel were set to 0, does the bind() call
automatically allocate an unused RFCOMM server channel ?
 
 
Thanks
 
Graeme Brown
 
 
 

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Re: [Bluez-users] Question re .bind() call on an RFCOMM socket

[Marcel Holtmann]

Hi Graeme,

> I am trying to understand how bind() call to  BlueZ RFCOMM socket
> behaves .
> 
> If the loc_addr.rc_channel were set to 0, does the bind() call
> automatically allocate an unused RFCOMM server channel ?

if you use the latest kernel then it will select the next unused RFCOMM
channel.

Regards

Marcel




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