Hello! Thanks for your reply, the fact is that I am not writing a device driver but just an user-space program and I would like implement a technique like /proc/ under a normal directory. Like /tmp/blahblah I have a program which take count about some statistics and I want read them "on demand" doing a cat of /tmp/blahblah, I investigate a bit and : 1) FIFO can be a solution but if I am not wrong I need two FIFO, one for say "I want read stats" and another one where write them 2) I could use inotify and write on a file the stats when file under monitoring is opened for read. In both cases I need two file, I would like instead use one, how can I do that ? Many many thanks, Pietro. -----Original Message----- From: kernelnewbies-bounces@xxxxxxxxxxxxxxxxx [mailto:kernelnewbies-bounces@xxxxxxxxxxxxxxxxx] On Behalf Of Bernd Petrovitsch Sent: mercoledì 28 novembre 2012 14:06 To: kernelnewbies@xxxxxxxxxxxxxxxxx Subject: Re: FIFO Hi! On Mit, 2012-11-28 at 09:43 +0000, Pietro Paolini wrote: [....] > I would like use a FIFO to implement a pipe which use is quite the > same of the /proc/fs (for example the net statistics then just read). /proc/fs is a directory hereover. > I would like use the cat command in order to reach the information, like: > > Cat /path/to/pipe > > The problem is that cat expect the EOF of file before exit and stay That "problem" is the defined behaviour and all programs will behave that way. > blocked until that, someone know how can I solve the problem ? Wherever your driver sends out the data (when user-space read(2)s it), you just return 0 (instead of sleeping/blocking the process) if you are at the end of the output. Kind regards, Bernd -- Bernd Petrovitsch Email : bernd@xxxxxxxxxxxxxxxxxxx LUGA : http://www.luga.at _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
