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The Basics
Id: 75580
Status: open
Priority: 0/
Queue: FCGI
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Owner: Nobody in particular
Requestors: MITHALDU [...] cpan.org
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Severity: (no value)
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History Show all quoted text
  Tue Mar 06 11:31:20 2012 MITHALDU [...] cpan.org - Ticket created
Subject: FCGI's tieing of filehandles breaks Capture::Tiny
A truncated stacktrace of the issue is available here: https://gist.github.com/443529eb62803ffce537 The docs of Capture::Tiny explain a workaround: https://metacpan.org/ module/Capture::Tiny#Modifying-filehandles-before-capturing (search the page for "FCGI") However this workaround is not acceptable, since users unaware of the issue will just get hit with an error that tells them nothing and whether or not they find this workaround is up to luck. Is there a way to fix this in FCGI or to identify it at runtime and throw an instructive error?
  Tue Mar 06 11:50:30 2012 dagolden [...] cpan.org - Reference to ticket #74861 added
  Tue Mar 06 11:53:56 2012 MITHALDU [...] cpan.org - Correspondence added
Some more info from the author of Capture::Tiny : xdg > mst, I suspect the tied handles don't implement or mis-implement OPEN, preventing C::T from opening handles on STDOUT/STDERR to be used for capture xdg > it may also be a fundamental limitation of tied handles. I'm not sure. xdg > but C::T's tests on "standard" tied handles work fine
  Tue Mar 06 11:53:58 2012 MITHALDU [...] cpan.org - Status changed from 'new' to 'open'
  Wed Mar 07 09:38:43 2012 dagolden [...] cpan.org - Correspondence added
FCGI::Stream uses a blessed scalar reference rather than a blessed glob reference. When OPEN calls open(), an exception is thrown. Changing the object to a blessed glob ref will fix this problem.
  Wed Mar 07 20:58:45 2012 dagolden [...] cpan.org - Correspondence added
On Wed Mar 07 09:38:43 2012, DAGOLDEN wrote: Show quoted text
> FCGI::Stream uses a blessed scalar reference rather than a blessed glob > reference. When OPEN calls open(), an exception is thrown. Changing > the object to a blessed glob ref will fix this problem.
Clarification: changing to a blessed glob ref "fixes" the crash, but is wrong as well since "opening" the globref to something is meaningless, given that the handle returns data from FCGI, regardless. Better would be to make OPEN die with a reasonable error message that the operation is unsupported.
  Thu Mar 08 07:17:04 2012 chansen [...] cpan.org - Correspondence added
Vid Ons, 07 Mar 2012 kl. 20.58.45, skrev DAGOLDEN: Show quoted text
> On Wed Mar 07 09:38:43 2012, DAGOLDEN wrote:
> > FCGI::Stream uses a blessed scalar reference rather than a blessed glob > > reference. When OPEN calls open(), an exception is thrown. Changing > > the object to a blessed glob ref will fix this problem.
> > Clarification: changing to a blessed glob ref "fixes" the crash, but is > wrong as well since "opening" the globref to something is meaningless, > given that the handle returns data from FCGI, regardless. > > Better would be to make OPEN die with a reasonable error message that > the operation is unsupported.
I have fixed this in trunk[1], attempts to call open on a FCGI::Stream throws: q/Operation 'OPEN' not supported on FCGI::Stream handle/ [1] http://git.shadowcat.co.uk/gitweb/gitweb.cgi? p=catagits/fcgi2.git;a=commit;h=fd4e384a0d3ee82faf4be58384d5648d7eaeebd1 -- chansen