Bugs item #764685, was opened at 2003-07-02 15:52
Message generated for change (Comment added) made by simonmar
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Category: None
Group: None
>Status: Closed
>Resolution: Fixed
Priority: 5
Submitted By: Hampus Ram (hampusr)
>Assigned to: Simon Marlow (simonmar)
Summary: GHCi breaks the terminal
Initial Comment:
After running ghci the terminal does not work exactly
as it should: Running "su" does no longer work for some
unknown reason (su stops after reading the first
character of the password). This happens with ghc 5.04
as well as 6.0 and current CVS-version, both in xterm
and console. This only seem to be a problem with my
Linux/Debian installation, I cannot reproduce the
problem on Solaris.
Also some minor spelling :) According to the CVS
users-guide the reverse of -frules-off is the very same
-frules-off.
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>Comment By: Simon Marlow (simonmar)
Date: 2003-09-24 10:36
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Fixed, thanks. It turns out that it is nothing to do with
readline, but indeed GHC's IO library should really be
restoring the terminal settings if it changes them.
Note that #811427 is another report of the same bug.
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Comment By: Hampus Ram (hampusr)
Date: 2003-07-28 10:20
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I performs a ioctl at the end, strace says:
ioctl(1, SNDCTL_TMR_TIMEBASE, {B38400 opost isig icanon echo
...}) = 0
when running with input from /dev/null. This is all ok.
However when running in the terminal it says:
ioctl(1, SNDCTL_TMR_TIMEBASE, {B38400 opost isig -icanon
echo ...}) = 0
Not so good. Dpkg reports that I'm using readline 4.3-5. I'm
running bash (2.05b-7) as my primary shell but I just tried
tcsh and there it all works well!
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Comment By: Simon Marlow (simonmar)
Date: 2003-07-28 09:20
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Readline is supposed to reset the terminal. Could you try
strace ghci </dev/null
and see if it attempts to reset the terminal at the end? My
trace has an ioctl(1, ...) near the end.
What version of readline? Is it different from your Debian-
running friends? What shell are you using? (some shells
save/restore the terminal settings between running
commands).
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Comment By: Hampus Ram (hampusr)
Date: 2003-07-27 21:27
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The (only) difference is that instead of icanon (before)
ghci leaves the terminal with -icanon (su no longer works
using line buffering, I think).
I've had this problem before with an older installation of
Debian too but no one else of my Debian-running friends seem
to have this problem.
Well, it's a minor problem but annoying.
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Comment By: Simon Marlow (simonmar)
Date: 2003-07-22 11:27
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I can't reproduce this on our boxes here. It could be a
readline problem.
Could you try 'stty -a' before and after running GHCi, and
post the results?
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