Hi Here's an addition to my "Mysterious function timer_settime" message: This test program: import HsShellScript main = call (exec "/bin/echo" ["bla bla"] -|- exec "/bin/cat" []) produces this output: test: test: <stderr>: hPutStr: illegal operation (handle is closed)<stderr>: hPutStr: illegal operation (handle is closed) test: timer_settimetest: : Invalid argument timer_settime: Invalid argument test: Exited (ExitFailure 1) I'm almost sure that the two examples work fine in the last working version of HsShellScript. They use GHC-6.11. (I can't verify this, since I have GHC-7.0.4 version installed. The old GHC version isn't available as a Debian package any longer.) So there appears to be a downwards-incompatibilty in the GHC libraries. I'm fiddling with the internals quite a bit, in order to get forks, pipes and redirects etc. working. Any hint would be appreciated. Volker

On 28/09/2011 11:58, Volker Wysk wrote:

Hi!

Im porting my HsShellScript library to GHC-7.0.4 and to Cabal/Hackage.

It builds and installs fine:

~/src/hsshellscript-3.0.0 $ cabal clean cleaning...

~/src/hsshellscript-3.0.0 $ cabal configure Resolving dependencies... Configuring hsshellscript-3.0.0...

~/src/hsshellscript-3.0.0 $ cabal build Preprocessing library hsshellscript-3.0.0... Building hsshellscript-3.0.0... (...) Registering hsshellscript-3.0.0...

~/src/hsshellscript-3.0.0 $ cabal haddock Running Haddock for hsshellscript-3.0.0... Preprocessing library hsshellscript-3.0.0... (...) Documentation created: dist/doc/html/hsshellscript/index.html

~/src/hsshellscript-3.0.0 $ cabal install Resolving dependencies... Configuring hsshellscript-3.0.0... Preprocessing library hsshellscript-3.0.0... Building hsshellscript-3.0.0... Registering hsshellscript-3.0.0... Installing library in /home/v/.cabal/lib/hsshellscript-3.0.0/ghc-7.0.4 Registering hsshellscript-3.0.0...

I've made a fine little test program src/test.hs:

import HsShellScript

main = (outm "3\n1\n2\n") -|- exec "/usr/bin/sort" ["-n"]

But this doesn't work. It generates a mysterious error message:

~/src/hsshellscript-3.0.0 $ src/test test:<stderr>: hPutStr: illegal operation (handle is closed) test: timer_settime: Invalid argument

timer_settime is used by the RTS, see the file rts/posix/Itimer.c. I don't know why it's being called with an invalid argument in your program - maybe you can compile with -debug and use gdb to find out? Cheers, Simon

"timer_settime" occurs only in the generated test binary. It doesn't occur anywhere in the library or in "/usr/bin/sort":

~/src/hsshellscript-3.0.0 $ find -type f -print0|xargs -0 egrep timer_settime Übereinstimmungen in Binärdatei ./src/test. ~/src/hsshellscript-3.0.0 $ egrep timer_settime /usr/bin/sort (no output)

It looks like GHC has introduced this mysterous call of timer_settime. What does that mean?

Thanks for any help, Volker W.

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