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Re: Spurious "Invalid Argument" on file open

by BrowserUk (Pope)
on Oct 23, 2012 at 12:28 UTC ( #1000470=note: print w/replies, xml ) Need Help??


in reply to Spurious "Invalid Argument" on file open

What do you get from $^E?:

if(-e $rule_file) { if(open(my $rule_fh,'<',$rule_file)) { .... } else { die "Can not read file $rule_file : $! / $^E"; } }

With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

RIP Neil Armstrong

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Re^2: Spurious "Invalid Argument" on file open
by rovf (Priest) on Oct 23, 2012 at 14:27 UTC
    What do you get from $^E
    I don't know (yet). I already thought to output this value too, but I can't do any changes to the application during the next couple of weeks, so this has to wait.

    I thought maybe the effect I'm experiencing might be well known already, so someone could already have a good guess what's going wrong. I now understand that this error code is far too general, to reasonably diagnose the problem....

    -- 
    Ronald Fischer <ynnor@mm.st>

      The most likely reason -- especially given the network involvement -- is TOCTTOU.


      With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
      Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
      "Science is about questioning the status quo. Questioning authority".
      In the absence of evidence, opinion is indistinguishable from prejudice.

      RIP Neil Armstrong

        I don't see the possibility for a race condition here. A race condition could happen, if something changes to the file between the time I check the existence, and the time I read the file. However, the file is pretty static: It is kind of a configuration file, and after it is created, it doesn't change for weeks, maybe months.


        -- 
        Ronald Fischer <ynnor@mm.st>

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