On Mar 25 16:26, Denis Excoffier wrote:
> On 2015-03-24 20:53, Corinna Vinschen wrote:
> > - However, if you start xterm from the X server tray icon and then
> > call `stty -a' in it, min is set to 4 and script will misbehave.
> > If you call `stty min 1' before calling script, script will work
> > as expected again.
> >
> > So, why does the X server (or whatever controls starting applications
> > from the X server tray icon) set VMIN to 4?
> >
>
> It seems that this has something to do with tcsh (and not with XWin).
> If you arrange your environment in order that the xterm launches /bin/bash
> (instead of tcsh), you get min=0 under 'stty -a' and /bin/script behaves
> as expected. If afterwards, in such an xterm, you run '/bin/csh -f', you get
> min=4.
>
> Consider the following:
>
> diff -uNr tcsh-6.18.01-original/ed.init.c tcsh-6.18.01-patched/ed.init.c
> --- tcsh-6.18.01-original/ed.init.c 2006-08-24 22:56:08.000000000 +0200
> +++ tcsh-6.18.01-patched/ed.init.c 2015-03-25 15:56:33.000000000 +0100
> @@ -65,7 +65,7 @@
> (uc)CDSWTCH, (uc)CERASE2, (uc)CSTART, (uc)CSTOP,
> (uc)CWERASE, (uc)CSUSP, (uc)CDSUSP, (uc)CREPRINT,
> (uc)CDISCARD, (uc)CLNEXT, (uc)CSTATUS, (uc)CPAGE,
> - (uc)CPGOFF, (uc)CKILL2, (uc)CBRK, (uc)CMIN,
> + (uc)CPGOFF, (uc)CKILL2, (uc)CBRK, (uc)1,
> (uc)CTIME
> },
> {
>
> In the original code, CMIN is set to CEOF and CEOF is set to Control-D, hence
> min=4. With the patch above, all seems to go well. But this does not
> explain why the min=4 is not permanent.Thanks for looking into that. I'm not sure either why this doesn't occur all the time, but the culprit seems to be this snippet in ed.term.h: #ifndef CMIN # define CMIN CEOF #endif /* CMIN */ The default value for CEOF is '\4'. And no header on Cygwin defines CMIN, so this looks like two bugs in one (buy one, get one free). Per `git blame' this code in tcsh is from 1991, so maybe we have two 20th century bugs here. I'll ask the tcsh maintainer and add a definition for CMIN to 1 (as on Linux) to the headers for the next Cygwin version. Thanks, Corinna -- Corinna Vinschen Please, send mails regarding Cygwin to Cygwin Maintainer cygwin AT cygwin DOT com Red Hat
pgpyT5AC0fj9Y.pgp
Description: PGP signature
