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Re: FAQ: gnuplot vs. emacs' compile command
From: |
Stefan Monnier |
Subject: |
Re: FAQ: gnuplot vs. emacs' compile command |
Date: |
12 Feb 2004 14:34:11 -0500 |
User-agent: |
Gnus/5.09 (Gnus v5.9.0) Emacs/21.3.50 |
> Did anyone actually look at this bug back in May ?
> FYI, I have included the text at the referenced link here.
What is the bug exactly?
My understanding is of the problem:
when Emacs exits, gnuplot is killed because its stdout is connected to
Emacs (i.e. it receives a SIGPIPE or SIGHUP or somesuch).
Stefan
> Dan Jacobson <address@hidden> writes:
>> Fellas, the gnuplot team may have found ugly emacs process bugs, see
>> <...>
>>
> : Dan Jacobson <address@hidden> wrote:
> :
> : > Using emacs -eval '(compile "make")'
> : > With: echo "plot 'file';pause -1"|gnuplot -persist
> : > just flashes the graph for a split second.
> :
> : So let's get into dissecting this further. The first candidate to
> : remove is 'make'. It doesn't really do anything useful in this whole
> : setup, so we might as well get rid of it. Let's replace it by a shell
> : script doing the same things. And while at it, let's get rid of the
> : separate data file, too:
> :
> : --- gpaction ---
> : gnuplot -persist <<EOS
> : plot '-'
> : 1 1
> : 2 2
> : e
> : EOS
> : ---- end ---
> :
> : sh gpaction # does the plot and returns
> : emacs -eval '(compile "sh gpaction")' # doesn't plot, but returns
> : emacs -eval '(shell-command "sh gpaction")' # plot, but no return
> :
> : For the latter, emacs is unresponsive --- it's obviously waiting for
> : something to happen, which doesn't. Only after you terminate the
> : gnuplot graph window (key 'q' into it), or press Ctrl-G in emacs to
> : forcibly break out of the wait loop, it will continue.
> :
> : During that pause, look at the output from 'ps jx' and you'll find
> : that gnuplot_x11 is an orphan --- i.e. it's the only surviving process
> : in its process group. In "shell-command", emacs apparently doesn't
> : kill it, whereas in "compile", it probably does.
> : --
> : Hans-Bernhard Broeker (address@hidden)
> : Even if all the snow were burnt, ashes would remain.
> --
> Kim F. Storm http://www.cua.dk
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