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Re: Why would chmod( ... ) fail with "No such file or directory" [message #173164 is a reply to message #173159]

Fri, 25 March 2011 14:00

The Natural Philosoph
Messages: 993
Registered: September 2010

Karma:

Senior Member

Simon wrote:
> Hi,
>
> I have some code that creates a temp file, writes to it and then calls
> chmod(...) to make sure that the file has 0644 permissions.
>
> // -------------
> // pseudo code
> //
> $tmpfname = 'xyx'; // come from another function.
>
> if (!($fd = @fopen($tmpfname, 'wb')))
> {
> return false;
> }
>
> fwrite($fd, $data ); // the data comes from another function has well.
> no warnings given.
> fclose($fd); // no warnings given.
> chmod( $tmpfname, 0644 ); <!-- error here with "No such file or directory"
> // -------------
>
> The issue I have is that it works _sometimes_, in fact, 99% of the time
> it works.
> But from time to time the log reports that the file does not exist.
>
> But how it is possible, if the file opened successfully with fopen( ... )
>
> I wonder if the problem is partly because I am using @fopen(...) rather
> than fopen(...), (I don't need to suppress the warnings).
>
> But in that case fwrite(...) and fclose(...) would also report
> errors/warnings.
>
> Any suggestions as to why chmod(...), (and a subsequent rename(...) )
> would sometimes not work.
>

I ran into some very strange issues like this a year back..my conclusion
was that PHP caches file info and doesn't (always )flush to the OS until
the session ends, if it can. So system calls within php referring to
that file may fail.

In my case it was a total failure of the mysql LOAD FILE command to find
a PHP uploaded file until I had copy()-ed it to another filename...

> Thanks
>
> Simon
>

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[Message index]

		Why would chmod( ... ) fail with "No such file or directory" By: Simon on Fri, 25 March 2011 09:35
		Re: Why would chmod( ... ) fail with "No such file or directory" By: alvaro.NOSPAMTHANX on Fri, 25 March 2011 10:31
		Re: Why would chmod( ... ) fail with "No such file or directory" By: Simon on Fri, 25 March 2011 12:37
		Re: Why would chmod( ... ) fail with "No such file or directory" By: alvaro.NOSPAMTHANX on Fri, 25 March 2011 12:52
		Re: Why would chmod( ... ) fail with "No such file or directory" By: Jerry Stuckle on Fri, 25 March 2011 13:29
		Re: Why would chmod( ... ) fail with "No such file or directory" By: Leonardo Azpurua on Fri, 25 March 2011 14:14
		Re: Why would chmod( ... ) fail with "No such file or directory" By: The Natural Philosoph on Fri, 25 March 2011 14:00
		Re: Why would chmod( ... ) fail with "No such file or directory" By: crankypuss on Fri, 25 March 2011 17:52
		Re: Why would chmod( ... ) fail with "No such file or directory" By: Twayne on Fri, 25 March 2011 23:20

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