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

[Denis Kenzior <denkenz@gmail.com>]

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Hi Daniel,

On 08/21/2012 10:09 AM, Daniel Wagner wrote:
> Hi Marcel,
>
> [sorry, a resend, ofono doesn't like non subscriber to post]
>
> 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?
>

ppp_debug would be best

>>> 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.
>

There is a check for TUN inside drivers/atmodem/gprs-context.c 
at_gprs_context_probe().  Why it isn't being triggered I do not know.

Regards,
-Denis