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POOn W32 Emacs why does Ctrl-D in Cygwin or MinGW bash issues repeated EOFs?
 

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  1. POOn W32 Emacs why does Ctrl-D in Cygwin or MinGW bash issues repeated EOFs?
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    <p>I'm using W32 GNU Emacs 24.1.50.1 with Cygwin bash 3.2.51. I know that this combination is very troublesome (see <a href="http://emacswiki.org/emacs/NTEmacsWithCygwin" rel="nofollow noreferrer">EmacsWiki</a> and <a href="http://cygwin.com/ml/cygwin/2012-05/msg00114.html" rel="nofollow noreferrer">Cygwin list</a>). However the problem I want to solve now is not confined to Cygwin. I got the issue with MinGW as well. So, the problem is:</p> <p>In Emacs start a shell via <code>M-x shell</code> provided you have set up the variables <code>shell-file-name</code> and <code>explicit-bash-args</code> appropriately (see e.g. <a href="https://stackoverflow.com/questions/235254/how-can-i-run-cygwin-bash-shell-from-within-emacs">here</a>). Then issue a command which expects stdin input, e.g. <code>cat</code>. To cancel out of <code>cat</code> you can usually type Ctrl-D <em>once</em> and you return to the shell prompt. In W32 emacs when you do this (or even when you issue explicitly <code>M-x comint-send-eof</code>) the cat command gets exited <em>and</em> the bash shell quits as well.</p> <p>I tried to increases bash's "resilience' by setting the environment variable <code>IGNOREEOF</code> to, say, 5, but then a single Ctrl-D results in the following output</p> <pre><code>$ Use "exit" to leave the shell. $ Use "exit" to leave the shell. $ Use "exit" to leave the shell. $ Use "exit" to leave the shell. $ Use "exit" to leave the shell. $ exit Process shell finished </code></pre> <p>and, of course, the bash has exited again. This problem only happens when the shell runs in W32 emacs - Cygwin bash through the Cygwin tty window and MinGW bash through its own MinTTY work fine.</p> <p>Why is this happening in W32 Emacs and how can I just exit the running subcommand (e.g. <code>cat</code>) when using W32 Emacs without exiting the bash shell?</p>
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    1. COI am ware that W32 Emacs doesn't support proper sifnal handling (that's why `M-x comint-stop-subjob` returns an error.) But W32 Emacs is doing *something* on `M-x comint-send-eof`. Unfortunate it's logic isn't expressed in ELISP, but burried in the C code I haven't examined yet. - So I am hoping a Emacs C-source guru could tell me more...
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