----- Original Message ----- From: "Christof Warlich" <[email protected]> To: "Harald Becker" <[email protected]> Cc: <[email protected]> Sent: Monday, January 23, 2012 7:42 PM Subject: Re: how to test if a pipe contains data
> Am 23.01.2012 09:43, schrieb Harald Becker: > > Hallo Laurent! > > > >>> Anyhow, if it helps, or even if someone is interested, I'm happy to > >>> explain in detail why I need to peek for data on a filedescriptor. > >> I'd be interested in knowing why you need to do that. Maybe, by > >> looking at the big picture, we can help you design a solution that > >> fulfills your needs without this particular issue. > > You hit it exactly. Beside this I'm willing to help finding a solution > > and to do not only complain ... but it's absolute necessary to have the > > full picture to say anything about this. > > > > -- > > Harald > > I need to transfer data coming from a pipe over a UMTS link to a web server. > From time to time, the UMTS link goes down, and worse, it sometimes cannot > be reestablished. I believe that in these cases, the firmware of the > UMTS stick > hangs, but this is just a guess. Anyhow, the only way I could get the > link up and > running again when this happens is to reboot the whole system. > > As my application will have tried for quite a while to get the link up > before such drastic measures, quite some data may have accumulated in the pipe. > To avoid loosing that data, I need to drain the pipe to store its data > to a file surviving the recovery. This is the place where I just want to check if > there is still data in the pipe. If it is empty, I reboot. If the stick is usb-powered, you may find more convenient than reboot to just reset or maybe unpower usb. I made usb reset with 2.4 kernel on the time of usb adsl modem using modprobe -r / modprobe with hcd module. Gilles _______________________________________________ busybox mailing list [email protected] http://lists.busybox.net/mailman/listinfo/busybox
