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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

mdbfontencoding

mdbFontEncoding(5)						 The m17n Library						mdbFontEncoding(5)

NAME

       mdbFontEncoding - Font Encoding

DESCRIPTION

       The m17n library loads information about the encoding of each font form the m17n database by the tags <font, encoding>. The data is loaded
       as a plist of this format.

       FONT-ENCODING ::= PER-FONT *

       PER-FONT ::= '(' FONT-SPEC ENCODING [ REPERTORY ] ')'

       FONT-SPEC ::=
	   '(' [ FOUNDRY FAMILY
	      [ WEIGHT [ STYLE [ STRETCH [ ADSTYLE ]]]]]
	    REGISTRY ')'

       ENCODING ::= SYMBOL

       FONT-SPEC is to specify properties of a font. FOUNDRY to REGISTRY are symbols corresponding to Mfoundry to Mregistry property of a font.
       See m17nFont for the meaning of each property.

       For instance, this FONT-SPEC:

	   (nil alice0 lao iso8859-1)

       should be applied to all fonts whose family name is 'alice0 lao', and registry is 'iso8859-1'.

       ENCODING is a symbol representing a charset. A font matching FONT-SPEC supports all characters of the charset, and a character code is
       mapped to the corresponding glyph code of the font by this charset.

       REPERTORY is a symbol representing a charset or 'nil'. Omitting it is the same as specifying ENCODING as REPERTORY. If it is not 'nil', the
       charset specifies the repertory of the font, i.e, which character it supports. Otherwise, whether a specific character is supported by the
       font or not is asked to each font driver.

       For so called Unicode fonts (registry is 'iso10646-1'), it is recommended to specify 'nil' as REPERTORY because such fonts usually supports
       only a subset of Unicode characters.

COPYRIGHT

       Copyright (C) 2001 Information-technology Promotion Agency (IPA)
       Copyright (C) 2001-2011 National Institute of Advanced Industrial Science and Technology (AIST)
       Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License
       <http://www.gnu.org/licenses/fdl.html>.

Version 1.6.2							    12 Jan 2011 						mdbFontEncoding(5)
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