reassign 651420 emacs23
retitle 651420 call-process behavior wrt. to read only buffers depends on
coding system for read operations
thanks
I was finally able to reproduce the problem with emacs23 23.2+1-7
and 23.4+1-3. The problem can be triggered with a non-utf8 locale
setting, eg
LANG=de_DE emacs
has the described problem while
LANG=de_DE.utf8 emacs
does not show the described problem.
Pierre, can you try with the locale fr_FR.utf8 ?
More investigation shows that a non-utf8 locale sets
default-process-coding-system to iso-latin-1-unix, which changes
the behavior of call-process with respect to read only buffers.
Indeed, if you save
(let ((buf (get-buffer-create "xxx")))
(with-current-buffer buf
(compilation-mode))
(let ((coding-system-for-read 'iso-latin-1-unix))
(condition-case err
(progn
(call-process "/bin/cat" "/proc/cpuinfo" buf t)
(message "iso-latin-1-unix: No call-process error"))
(error
(message "iso-latin-1-unix: call-process error: %s %s"
(car err) (cdr err)))))
(let ((coding-system-for-read 'utf-8-unix))
(condition-case err
(progn
(call-process "/bin/cat" "/proc/cpuinfo" buf t)
(message "utf-8-unix: No call-process error"))
(error
(message "utf-8-unix: call-process error: %s %s"
(car err) (cdr err))))))
to /tmp/test.el, then
/usr/bin/emacs -q --no-site-file -batch -l /tmp/test.el
will print
iso-latin-1-unix: call-process error: buffer-read-only (xxx)
utf-8-unix: No call-process error
regardless of the locale setting.
I don't know whether call-process should silently write to
read-only buffers. But regardless of that, call-process should do
the same thing with read-only buffers independent of the coding
system for read operations.
Bye,
Hendrik
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