yeah, snoppy1314, Not everyone can see your HTML based email because
of different E-mail client, Greg's explanation is professional. Thx!
why you need three process to do this thing? what's the scenario ?
2009/4/16 Greg Freemyer <greg.freemyer@xxxxxxxxx>:
> An HTML based email. Please, not here.
>
> Answer below which is standard protocol on this list.
>
> 2009/4/16 snoppy1314 <snoppy1314@xxxxxxx>:
>>
>>
>> Hi:
>>
>> I have three progree: HIT, new-sim300 and pppd, also have a driver
>> cdc-acm.ko(it generates a device file /dev/ttyACM0).
>> I call open(/dev/ttyACM0) in HIT, and then call system("./pppd") and
>> system("./new-sim300") in HIT. I think, when I kill HIT, the
>> close(dev/ttyACM0) will be called automatically.But in fact, the
>> close(dev/ttyACM0) isn't called until the pppd, new-sim300 and HIT are all
>> killed.who can tell me why?
>> Thanks in advance!
>
> Below is guesswork:
>
> I suspect that in HIT you close one of stdin / stdout / stderr. Then
> when you open /dev/ttyACM0, it gets assigned one of those file
> descriptors.
>
> The system() call then launches the children with the inherited stdin
> / stdout / stderr files already open. The number of times the file is
> open is tracked and your kernel close() code is not called until the
> open count is decremented to zero based on all three programs dieing.
>
> Greg
> --
> Greg Freemyer
> Head of EDD Tape Extraction and Processing team
> Litigation Triage Solutions Specialist
> http://www.linkedin.com/in/gregfreemyer
> First 99 Days Litigation White Paper -
> http://www.norcrossgroup.com/forms/whitepapers/99%20Days%20whitepaper.pdf
>
> The Norcross Group
> The Intersection of Evidence & Technology
> http://www.norcrossgroup.com
>
> --
> To unsubscribe from this list: send an email with
> "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx
> Please read the FAQ at http://kernelnewbies.org/FAQ
>
>
--
To unsubscribe from this list: send an email with
"unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx
Please read the FAQ at http://kernelnewbies.org/FAQ
