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Re: When <> fails

by pc88mxer (Vicar)
on Jul 29, 2008 at 19:32 UTC ( #700904=note: print w/replies, xml ) Need Help??

in reply to When <> fails

The current file handle that <> is using is stored in ARGV, but my testing shows that perl has alrady closed ARGV when the while (<>) {...} loop terminates.

You might try checking $! to see if that gets set when the NFS server stops serving the file:

while (<>) { ... } # check $! which is probably from the last close
Update: ikegami pointed out that testing $! (as in if ($!) ... doesn't make sense here.

One issue is that $! is only set when there is an error. One way around this is to force a known error at the end of the loop so that you can tell if readline generated an error.

Update 2: One can assign to $!, so this should be able to detect if readline failed:

while (<>) { ... $! = undef; } if (defined($!)) { # $! contains error from last <c>close
} </c>

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