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@kernelnewbies.org [mailto:kernelnewbies-bounces@kernelnewbies.org] On Behalf Of Bernd Petrovitsch Sent: mercoledì 28 novembre 2012 14:06 To: kernelnewbies@kernelnewbies.org 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@petrovitsch.priv.at LUGA : http://www.luga.at _______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies