01-18-2006
"Bucket Brigade" files?
Is it at all possible to use some combination of FIFOs and files to achieve the following:
A new file is created that is 0 bytes in length. As data is written to it, it grows. When it reaches a predefined size limit, it begins to discard data at the beginning of the file as new data gets written to it. So if I defined a file that only retains 1 gig of data, I would be guaranteed to only have the most current 1 gig.
I am working on a home PVR project and I am trying to duplicate what I had in the Hauppauge WinTV2000 software with the pause file. I was able to define a pause file that had a maximum of 4 gigs and it would be constantly written to as the old data was dropped. I have, as yet, been unable to reproduce this in Linux. However, I have a strong suspicion that I'm missing something...
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PAUSE(3) BSD Library Functions Manual PAUSE(3)
NAME
pause -- stop until signal
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <unistd.h>
int
pause(void);
DESCRIPTION
Pause is made obsolete by sigsuspend(2).
The pause() function forces a process to pause until a signal is received from either the kill(2) function or an interval timer. (See
setitimer(2).) Upon termination of a signal handler started during a pause(), the pause() call will return.
RETURN VALUES
Always returns -1.
ERRORS
The pause() function always returns:
[EINTR] The call was interrupted.
SEE ALSO
kill(2), poll(2), select(2), setitimer(2), sigsuspend(2)
STANDARDS
The pause() function conforms to ISO/IEC 9945-1:1990 (``POSIX.1'').
HISTORY
A pause() syscall appeared in Version 6 AT&T UNIX.
BSD
June 4, 1993 BSD