Re: [RFC] gatchat: Print error message if opening tun failes

[Daniel Wagner <daniel.wagner@bmw-carit.de>]

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Hi Marcel,

On 21.08.2012 15:00, Marcel Holtmann wrote:
>> This is a very common misstake. Let's help the users to
>> configure their system correctly.
>> ---
>>   gatchat/ppp_net.c | 6 +++++-
>>   1 file changed, 5 insertions(+), 1 deletion(-)
>>
>> diff --git a/gatchat/ppp_net.c b/gatchat/ppp_net.c
>> index 1609b99..7082de7 100644
>> --- a/gatchat/ppp_net.c
>> +++ b/gatchat/ppp_net.c
>> @@ -155,8 +155,12 @@ struct ppp_net *ppp_net_new(GAtPPP *ppp, int fd)
>>   	if (fd < 0) {
>>   		/* open a tun interface */
>>   		fd = open("/dev/net/tun", O_RDWR);
>> -		if (fd < 0)
>> +		if (fd < 0) {
>> +			fprintf(stderr, "Couldn't open tun device. "
>> +					"Do you run oFono as root and do you "
>> +					"have the TUN module loaded?");
>
> really, stderr?

I was not sure what 'channel' to use to report something from gatchat. 
Would g_print() be the right choice?

>>   			goto error;
>> +		}
>>
>>   		ifr.ifr_flags = IFF_TUN | IFF_NO_PI;
>>   		strcpy(ifr.ifr_name, "ppp%d");
>
> Aren't the atom drivers checking this case for you?

I don't know, but I had the exactly the same problem and I am pretty 
sure that there was not log entry in any kind. If there is better place 
to add such a log entry, I happy to send a patch.

cheers,
daniel