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Full Discussion: "Bucket Brigade" files?
Special Forums Hardware Filesystems, Disks and Memory "Bucket Brigade" files? Post 96198 by deckard on Wednesday 18th of January 2006 12:46:57 PM
Old 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
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