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Full Discussion: How to copy a binary file while the file is being written to by another process
Top Forums UNIX for Advanced & Expert Users How to copy a binary file while the file is being written to by another process Post 302603684 by mbuki on Thursday 1st of March 2012 07:13:42 PM
Old 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

vconsole.conf

VCONSOLE.CONF(5)						   vconsole.conf						  VCONSOLE.CONF(5)

NAME

       vconsole.conf - configuration file for the virtual console

SYNOPSIS

       /etc/vconsole.conf

DESCRIPTION

       The /etc/vconsole.conf file configures the virtual console, i.e. keyboard mapping and console font.

       The basic file format of the vconsole.conf is a newline-separated list environment-like shell-compatible variable assignments. It is
       possible to source the configuration from shell scripts, however, beyond mere variable assignments no shell features are supported,
       allowing applications to read the file without implementing a shell compatible execution engine.

       Note that the kernel command line options vconsole.keymap=, vconsole.keymap.toggle=, vconsole.font=, vconsole.font.map=,
       vconsole.font.unimap= may be used to override the console settings at boot.

       Depending on the operating system other configuration files might be checked for configuration of the virtual console as well, however only
       as fallback.

OPTIONS

       The following options are understood:

       KEYMAP=, KEYMAP_TOGGLE=
	   Configures the key mapping table of for they keyboard.  KEYMAP= defaults to us if not set. The KEYMAP_TOGGLE= can be used to configured
	   a second toggle keymap and is by default unset.

       FONT=, FONT_MAP=, FONT_UNIMAP=
	   Configures the console font, the console map and the unicode font map.  FONT= defaults to latarcyrheb-sun16.

EXAMPLE

       Example 1. German keyboard and console

       /etc/vconsole.conf:

	   KEYMAP=de-latin1
	   FONT=latarcyrheb-sun16

SEE ALSO

       systemd(1), loadkeys(1), setfont(8), locale.conf(5)

AUTHOR

       Lennart Poettering <lennart@poettering.net>
	   Developer

systemd 							    10/07/2013							  VCONSOLE.CONF(5)
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