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Re: Why would chmod( ... ) fail with "No such file or directory" [message #173160 is a reply to message #173159]

Fri, 25 March 2011 10:31

alvaro.NOSPAMTHANX
Messages: 277
Registered: September 2010

Karma:

Senior Member

El 25/03/2011 10:35, Simon escribió/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.

fwrite() returns FALSE if there was an error, you don't need to rely on
getting warnings.

> fclose($fd); // no warnings given.

Same with fclose().

> 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( ... )

Perhaps that $tmpfname string that comes from another function is not
always unique. If the file was created by another process, you may not
be its owner thus you don't have permission to change permissions, or
the other process may have removed it while you were writing it. There
are a number of tools that can prevent access to a file for security
reasons (from PHP's safe mode to SELInux) and you don't always get an
accurate error message.

--
-- http://alvaro.es - Álvaro G. Vicario - Burgos, Spain
-- Mi sitio sobre programación web: http://borrame.com
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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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