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Re: file being saved causes fatal error. [message #179726 is a reply to message #179724]

Wed, 28 November 2012 17:52

Jerry Stuckle
Messages: 2598
Registered: September 2010

Karma:

Senior Member

On 11/28/2012 10:57 AM, rodeored wrote:
> On Tuesday, November 27, 2012 10:42:27 PM UTC-5, Jerry Stuckle wrote:
>>
>> No. It's not PHP causing the problem - it's the OS. While the file is
>>
>> being saved, a good OS will prevent any other process from reading the
>>
>> file. Otherwise the other process may get part new, part old.
>>
>>
>>
>> Before changing ANY files on a live system you should first take the
>>
>> system offline, then make you changes, and bring the system back online.
>>
>>
> Thank you for your response. What is the system or mechanism for preventing other process from reading a file being saved called? This is on a Linux operating system on an Amazon server.
> If a good OS will prevent any other process from reading the file, then why does the system have to be taken off line?
>

When a file is being updated, the file will generally be locked by the
OS. Attempts to access it by other processes will return a lock error.

So you need to take other processes which may access the file (the
website, in this case) down while the update is being performed, or get
an error if someone tries to access it.

This has nothing to do with PHP. It's the OS doing it.

--
==================
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Jerry Stuckle
JDS Computer Training Corp.
jstucklex(at)attglobal(dot)net
==================

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[Message index]

		file being saved causes fatal error. By: rodeored on Wed, 28 November 2012 02:28
		Re: file being saved causes fatal error. By: Jerry Stuckle on Wed, 28 November 2012 03:42
		Re: file being saved causes fatal error. By: rodeored on Wed, 28 November 2012 15:57
		Re: file being saved causes fatal error. By: Robert Heller on Wed, 28 November 2012 17:30
		Re: file being saved causes fatal error. By: Jerry Stuckle on Wed, 28 November 2012 17:52
		Re: file being saved causes fatal error. By: The Natural Philosoph on Wed, 28 November 2012 19:02
		Re: file being saved causes fatal error. By: Anders Wegge Keller on Wed, 28 November 2012 19:15
		Re: file being saved causes fatal error. By: M. Strobel on Mon, 03 December 2012 09:20

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