RE: Interactive subprocess output not echoed until process ends

Stephen,

Thanks for writing back!

Again, I'm having problems within a shell, with subproccesses -- any
non-interactive shell command ("synchronous", I believe you'd call it --
e.g. ls, dir, etc) returns output just fine.  Many interactive shell
subprocesses (e.g. mysql, telnet command mode, etc) won't return the
output of the process until the process ends -- not terribly useful!
I've noticed that some interactive shell subprocsses (e.g. nslookup,
telnet to a host) interactively return the subprocess output.

For example, if I run "telnet", and hit return a few times (it should
give me an equal number of "telnet> " prompts), I get no output.  If I
type "quit" to the blank space, it then ends the telnet process and
gives me all the output at once.  As such:

-------------------------- shell output -------------------
~ $ telnet





quit
telnet> telnet> telnet> telnet> telnet> telnet> ~ $ 
-----------------------------------------------------------

Here're the values you requested, 

COMSPEC=C:\WINDOWS\system32\cmd.exe
SHELL=/bin/bash   (cygwin)

Below is what report-emacs-bug creates.

Thanks!

Dan Fineman
[email protected]

-------------------------- report-emacs-bug output -------------------


System Info to help track down your bug:
---------------------------------------

OS version:  Microsoft Windows 2000 [Version 5.00.2195] OS: Windows_NT
XEmacs 21.4.8 \"Honest Recruiter (Windows [2])\" configured for
`i586-pc-win32'.    Building XEmacs in
\"f:\\xemacs\\xemacs-21.4-release\\nt\".   Using compiler \"cl -nologo
-W3 -O2 -G5 -ML\".   Installing XEmacs in \"c:\\Program
Files\\XEmacs\\XEmacs-21.4.8\".   Package path is
\"~\\.xemacs;;c:\\Program Files\\XEmacs\\site-packages;c:\\Program
Files\\XEmacs\\xemacs-packages\".   Compiling in support for Microsoft
Windows native GUI.   Compiling in support for XPM images.   Compiling
in support for GIF images.   Compiling in support for PNG images.
Compiling in support for TIFF images.   Compiling in support for JPEG
images.   Compiling in support for X-Face message headers.   Compiling
in support for toolbars.   Compiling in support for dialogs.   Compiling
in support for widgets.   Compiling in support for native sounds.
Compiling in fast dired implementation.   Using minimal tagbits.   Using
indexed lrecord implementation.   Using portable dumper. 

Load-Path Lisp Shadows:
----------------------
nil


Installed XEmacs Packages:
-------------------------

((zenirc:version 1.13 :type regular)
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Features:
--------

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vhdl-autoloads vc-cc-autoloads vc-autoloads tramp-autoloads
tpu-autoloads tooltalk-autoloads tm-autoloads time-autoloads
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sounds-wav-autoloads sounds-au-autoloads slider-autoloads
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xface xpm xbm lisp-float-type windows-nt dragdrop-api dialog devices
window-system base64)


Recent keystrokes:
-----------------

C-c C-c C-x k RET M-x s h e l l RET t e l n e t RET 
RET RET RET RET RET q u i t RET button1 button1up button1 
button1up button1 button1up M-w misc-user button1 button1up 
e n v RET C-r s h e l l M-> e c h o RET e x p o r t 
RET C-r s h e l l M-> e c h o SPC $ S H E L L RET misc-user 
M-x r e p o r t SPC e m SPC a BS b u g SPC RET


Recent messages (most recent first):
-----------------------------------

Loading xemacsbug...done
Loading xemacsbug...
C:\Documents and Settings\Dan\ 
C:\Documents and Settings\Dan\ 
Loading shell...done
Loading shell...
Loading font...done
Loading font...
Loading time...done
Loading cus-face...done
Loading cus-face...
Loading time...
Loading comint...done
Loading comint...
Loading env...done
Loading env...





-----Original Message-----
From: Stephen J. Turnbull [mailto:[email protected]] On Behalf
Of Stephen J. Turnbull
Sent: Sunday, May 11, 2003 8:39 AM
To: Daniel E. Fineman
Cc: [email protected]
Subject: Re: Interactive subprocess output not echoed until process ends


>>>>> "Daniel" == Daniel E Fineman <[email protected]> writes:

    Daniel> If you start a shell, and then in that shell, start an
    Daniel> interactive sub-process (i.e. 'telnet' or 'mysql'), the
    Daniel> user won't see the output of the subprocess until the
    Daniel> subprocess ends.

This is likely to be either a misconfigured or out-and-out broken shell
rather than an XEmacs problem.  Most of the XEmacs Windows developers
live in shell buffers.

    Daniel> Is there any way to get the subprocess's output to be
    Daniel> echoed immediately?

For me (Windows 2000, XEmacs 21.4.12, 21.5.12), starting XEmacs and
typing M-x shell does the trick.  Shell is Cygwin bash.

Please send a full bug report using M-x report-emacs-bug, and don't
forget to tell us the values of your SHELL and COMSPEC environment
variables, and (if available ) the version of the shell.


-- 
Institute of Policy and Planning Sciences
http://turnbull.sk.tsukuba.ac.jp
University of Tsukuba                    Tennodai 1-1-1 Tsukuba 305-8573
JAPAN
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