[Bluez-devel] RFCOMM support for nonblocking sockets

[Bluez-devel] RFCOMM support for nonblocking sockets

[Collin R. Mulliner]

Hi,

does anybody know if O_NONBLOCK is supported for RFCOMM?

I allways get "errno == 11" and 
perror tells me "Resource temporarily unavailable"

If I don't do: fcntl(sock, F_SETFL, O_NONBLOCK) the code works fine.


thanks ... Collin

-- 
Collin R. Mulliner <collin@betaversion.net>
BETAVERSiON Systems [www.betaversion.net]
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Re: [Bluez-devel] RFCOMM support for nonblocking sockets

[Marcel Holtmann]

Hi Collin,

> does anybody know if O_NONBLOCK is supported for RFCOMM?
> 
> I allways get "errno == 11" and 
> perror tells me "Resource temporarily unavailable"
> 
> If I don't do: fcntl(sock, F_SETFL, O_NONBLOCK) the code works fine.

the non-blocking support should work. What kernel version do you? Show
us your code.

Regards

Marcel




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Re: [Bluez-devel] RFCOMM support for nonblocking sockets

[Marcel Holtmann]

Hi Collin,

> I'm on 2.6.6-mh2 (should be the newest) ...

since today it is -mh3, but that doesn't matters ;)

> the code is:
> 
> sock = socket(PF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM);
> 
> if (sock >= 0) {
> 	if (fcntl(sock, F_SETFL, O_NONBLOCK) != 0) {
> 		perror("fcntl()");
> 	}
> }

I don't know if this is the problem, but set the socket to non-blocking
after the bind() and the setsockopt() calls.

> psa.rc_family = AF_BLUETOOTH;
> psa.rc_channel = 0;
> 
> // src == BDADDR_ANY
> if (bacmp(&src, BDADDR_ANY) != 0) {
> 	psa.rc_bdaddr = src;
> 	if (bind(sock, (struct sockaddr *)&psa, sizeof(psa)) < 0) {	
> 		perror("Can't bind()");
> 		return(-1);
> 	}
> }

This check is not needed, because you can bind also src == BDADDR_ANY.
		
> psa.rc_channel = 1;
> psa.rc_bdaddr = dst;

Please try to use bacpy() to fill the rc_bdaddr.

> go:
> if (connect(sock, (struct sockaddr *)&psa, sizeof(psa)) != 0) {	
> 	if(errno == EINPROGRESS) {
> 		// never reached!
> 		pf[0].fd = sock;
> 		pf[0].events = POLLOUT;
> 		poll(pf, 1, -1);
> 		goto go;
> 	}
> 	else {
> 		perror("Connect()");
> 		// allways prints "Resource temporarily unavailable"
> 	}

Run "hcidump -x" to see what is going on. Print out the errno.

Regards

Marcel




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