Re: FIFO files

[Pierre Abbat <phma@webjockey.net>]

On Tuesday 17 June 2003 12:21, Cyrille Chepelov wrote:
> Hi all,
>
> I recently encountered a need for such a contraption as file-backed FIFOs.
> These are files where one process can append records at one end, and one
> other process can read records from the beginning of the file, chopping off
> the head of the file once it's not needed anymore. As I had to implement
> something right now on existing systems, I worked around the general
> absence for such a facility, but still, I'm wondering how difficult it
> would to write a reiserfs4 plug-in which would allow one to do the
> equivalent of a truncate() but truncating what's between the position 0 and
> the current cursor (effectively shifting all subsequent file positions),
> rather than truncating what's between the cursor and the end of file.
> (network considerations are explicitly out of the scope of this musing)

There's a program called "cupyvei" which allows one process to append records 
to a file, and any number of other processes to read independently from the 
beginning. It isn't unlimited though; it's a circular buffer, and the size is 
specified when you create it. Is that of any interest?

phma

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