Beefy Boxes and Bandwidth Generously Provided by pair Networks
go ahead... be a heretic
 
PerlMonks  

Re^2: How do I make the garbage collector throw an exception when it fails to auto-close a filehandle?

by Aristotle (Chancellor)
on Jan 13, 2007 at 23:51 UTC ( #594579=note: print w/ replies, xml ) Need Help??


in reply to Re: How do I make the garbage collector throw an exception when it fails to auto-close a filehandle?
in thread How do I make the garbage collector throw an exception when it fails to auto-close a filehandle?

In my system, the final string on STDERR gets printed when the close above is commented; uncommenting the close triggers the fatal error:

And thatís exactly the point: when you have an explicit close, you can make it throw an exception; when you omit the close, the error is silent. But I want to omit the close and still get an exception. Fatal wonít help me there.

Thanks for the pointer about the loop device though! All I can say in retrospect is, díuh. However, Linux has an easier way, mentioned by Zaxo in the old thread from gaal: thereís a /dev/full device where writing always fails with ENOSPC.

Makeshifts last the longest.


Comment on Re^2: How do I make the garbage collector throw an exception when it fails to auto-close a filehandle?
Re^3: How do I make the garbage collector throw an exception when it fails to auto-close a filehandle?
by BrowserUk (Pope) on Jan 14, 2007 at 00:01 UTC

      NoÖ

      $ perl -MFatal=open,close,syswrite
      -e'open $fh,">/dev/full"; syswrite $fh, 1; close $fh'
      Can't syswrite(GLOB(0x8130c24), 1): No space left on device at (eval 3) line 3
      	main::__ANON__('GLOB(0x8130c24)') called at -e line 1
      $ perl -MFatal=open,close
      -e'open $fh,">/dev/full"; print { $fh } 1 or die "$!\n"; close $fh'
      Can't close(GLOB(0x8130c24)): No space left on device at (eval 2) line 3
      	main::__ANON__('GLOB(0x8130c24)') called at -e line 1

      Ö not with buffered I/O.

      Makeshifts last the longest.

Re^3: How do I make the garbage collector throw an exception when it fails to auto-close a filehandle?
by polettix (Vicar) on Jan 14, 2007 at 01:01 UTC
    Oh, I misunderstood that you didn't know for sure about Fatal's behaviour:
    In the simplest case, use Fatal qw( :void close ); would work for this, but I strongly doubt it, and in any case I canít think of a good way to purposefully trigger a close failure in order to test it.
    And yes... the loop device rocks :)

    Flavio
    perl -ple'$_=reverse' <<<ti.xittelop@oivalf

    Don't fool yourself.

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://594579]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others about the Monastery: (11)
As of 2015-07-03 07:56 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









    Results (49 votes), past polls