On Tue, Jan 24, 2012 at 12:36:53AM +0100, Laurent Bercot wrote: > > 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. > > I must be missing something obvious here. Why don't you just do things > sequentially ? > > cat < namedpipe > savefile ; reboot
Note that all of these approaches have a nasty race condition where new data might get written to the pipe (and lost) after it's saved.. You really should find a more robust, professional solution. Ugly hacks like this are the reason so many embedded systems behave so poorly. Rich _______________________________________________ busybox mailing list [email protected] http://lists.busybox.net/mailman/listinfo/busybox
