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Home > Archive > Unix Programming > June 2005 > pseudo terminal input
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pseudo terminal input
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| Martin 2005-06-20, 6:05 pm |
| Hi everyone,
I'm having a strange problem while working with pseudo-terminals. The
problem arise when a new program reading from stdin is launched within
the pseudo-terminal. After such a program is started, the weird
sequence "^@" is echoed everytime I press a key.
For example, here is a typical session:
% ls
.. ..
% cat
h^@e^@l^@l^@o ^@w^@o^@r^@l^@d^@
Have anyone run through this kind of problem, or anything similar? Any
help would be greatly appreciated.
Many thanks!
Martin
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| Barry Margolin 2005-06-20, 8:50 pm |
| In article <IKGte.11283$5u4.35427@nnrp1.uunet.ca>,
Martin <_no_spam_please_martin@inro.ca> wrote:
> Hi everyone,
>
> I'm having a strange problem while working with pseudo-terminals. The
> problem arise when a new program reading from stdin is launched within
> the pseudo-terminal. After such a program is started, the weird
> sequence "^@" is echoed everytime I press a key.
>
> For example, here is a typical session:
> % ls
> . ..
> % cat
> h^@e^@l^@l^@o ^@w^@o^@r^@l^@d^@
>
> Have anyone run through this kind of problem, or anything similar? Any
> help would be greatly appreciated.
Looks like a bug in the program that's feeding the input to the master
side of the pty. It's apparently sending a NUL character after each
character.
--
Barry Margolin, barmar@alum.mit.edu
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***
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| Phil Endecott 2005-06-21, 8:01 am |
| Barry Margolin wrote:
> Martin wrote:
> It's apparently sending a NUL character after each
> character.
Could this be a character set issue? h^@ is a single 16-bit unicode
character, "h".
--Phil.
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| Martin 2005-06-21, 5:53 pm |
|
> Looks like a bug in the program that's feeding the input to the master
> side of the pty. It's apparently sending a NUL character after each
> character.
You are right! I thought we had to send a null char to the master, but
I was obviously wrong!
Many thanks!
Martin
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| Bill Marcum 2005-06-21, 5:53 pm |
| On Mon, 20 Jun 2005 17:42:00 -0400, Martin
<_no_spam_please_martin@inro.ca> wrote:
> Hi everyone,
>
> I'm having a strange problem while working with pseudo-terminals. The
> problem arise when a new program reading from stdin is launched within
> the pseudo-terminal. After such a program is started, the weird
> sequence "^@" is echoed everytime I press a key.
>
> For example, here is a typical session:
> % ls
> . ..
> % cat
> h^@e^@l^@l^@o ^@w^@o^@r^@l^@d^@
>
> Have anyone run through this kind of problem, or anything similar? Any
> help would be greatly appreciated.
>
Your terminal may be sending Unicode. See what happens if you type an
accented letter, if your keyboard layout allows it.
--
I cannot believe that God plays dice with the cosmos.
-- Albert Einstein, on the randomness of quantum mechanics
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