03-01-2012
How to copy a binary file while the file is being written to by another process
Hello,
Can I copy a binary file while the file is being written to by another process?
Another process (program) “P1” creates and opens (for writing) binary file “ABC” on local disk. Process P1 continuously write into ABC file every couple of seconds, adding 512-byte blocks of data. ABC file usually grows to the size of 20-30 MB.
I need to make a copy (replica) of ABC file every one hour, while process P1 is still active. My copy action must not disturb process P1 and no data can be lost (not written) into ABC file because of my copy action. It is ok if my action causes a short delay in P1 writing, but data must not be lost. It is ok if my copy of ABC file misses the latest blocks of data from ABC file. If I can safely make a copy of ABC file which will be a snapshot of ABC file from 5 minutes ago, that is ok for me.
Can you please help me with the description of steps that I need to do in my program or script?
Is there a way to open a file for read-only, but in a way that UNIX would guarantee that my reading program will not disturb the other writing program P1?
I'm working on AIX server.
Thank you,
Milan
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LEARN ABOUT DEBIAN
rackdiag
NWDIAG(1) General Commands Manual NWDIAG(1)
NAME
rackdiag - generate rack-structure-diagram image file from spec-text file.
SYNOPSIS
rackdiag [options] files
DESCRIPTION
This manual page documents briefly the rackdiag commands.
rackdiag is generate sequence-diagram image file from spec-text file.
OPTIONS
These programs follow the usual GNU command line syntax, with long options starting with two dashes (`-'). A summary of options is
included below. For a complete description, see the Info files.
-h, --help
show this help message and exit.
--version
show program's version number and exit.
-a, --antialias
Pass diagram image to anti-alias filter.
-c FILE, --config=FILE
read configurations from FILE.
-o FILE
write diagram to FILE.
-f FONT, --font=FONT
use FONT to draw diagram.
-T TYPE
Output diagram as TYPE format.
SEE ALSO
The programs are documented fully by
http://blockdiag.com/en/nwdiag/
AUTHOR
rackdiag was written by Takeshi Komiya <i.tkomiya@gmail.com>
This manual page was written by Kouhei Maeda <mkouhei@palmtb.net>, for the Debian project (and may be used by others).
June 11, 2011 NWDIAG(1)