[Haskell-cafe] Re: sendfile leaking descriptors on Linux?

Brandon S. Allbery KF8NH allbery at ece.cmu.edu
Fri Feb 5 19:24:17 EST 2010

On Feb 5, 2010, at 02:56 , Bardur Arantsson wrote:
> I should have posted this earlier, but the exact message I'm seeing  
> in the case where the Bad Client disconnects is this:
>   hums: Network.Socket.SendFile.Linux: resource vanished (Broken pipe)
> Oddly, I haven't been able to reproduce this using a wget client  
> with a ^C during transfer. When I "disconnect" wget with ^C or  
> "pkill wget" or even "pkill -9 wget", I get this message:
>  hums: Network.Socket.SendFile.Linux: resource vanished (Connection  
> reset by peer)
> (and no leak, as observed by "lsof | grep hums").

"Broken pipe" is normally handled as a signal, and is only mapped to  
an error if SIGPIPE is set to SIG_IGN.  I can well imagine that the  
SIGPIPE signal handler isn't closing resources properly; a workaround  
would be to use the System.Posix.Signals API to ignore SIGPIPE, but I  
don't know if that would work as a general solution (it would depend  
on what other uses of pipes/sockets exist).

brandon s. allbery [solaris,freebsd,perl,pugs,haskell] allbery at kf8nh.com
system administrator [openafs,heimdal,too many hats] allbery at ece.cmu.edu
electrical and computer engineering, carnegie mellon university    KF8NH

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