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Re: Dynamic modules: MODULE_HANDLE_SIGNALS etc.
From: |
Eli Zaretskii |
Subject: |
Re: Dynamic modules: MODULE_HANDLE_SIGNALS etc. |
Date: |
Mon, 04 Jan 2016 18:07:10 +0200 |
> Cc: address@hidden, address@hidden
> From: Daniel Colascione <address@hidden>
> Date: Mon, 4 Jan 2016 07:40:48 -0800
>
> >> The quick and dirty fix for Fdo_auto_save is to run
> >> Fdo_auto_save in a forked child
> >
> > Forking a child from a damaged parent is likely to leave us with the
> > same problem in the child. Also, if the original session uses up a
> > lot of memory, the fork could simply fail. (You later suggested a
> > vfork + exec, but that doesn't allow auto-saving from the child,
> > AFAIU.)
>
> The idea is that we can wait a bounded amount of time for the child,
> then kill it if it misbehaves.
Yes, but then there's no auto-saving, so this trick seems pointless to
me.
> The reason I suggested vfork is that glibc (the quality of which
> continues to disappoint me) doesn't provide an async-signal-safe
> fork. With the scheme I proposed, we don't *need* an
> async-signal-safe fork, since we can perform the entire emergency
> save operation inside the signal handler, without invoking
> lisp. We'd just vfork and exec to ask the user what we want to do,
> which is an optional process.
Why do we need to vfork+exec just to ask a question? We do this today
with a very low-level I/O calls, and that code worked since about
forever (I remember studying it 25 years ago).
- Re: Dynamic modules: MODULE_HANDLE_SIGNALS etc., (continued)
- Re: Dynamic modules: MODULE_HANDLE_SIGNALS etc., Daniel Colascione, 2016/01/03
- Re: Dynamic modules: MODULE_HANDLE_SIGNALS etc., Paul Eggert, 2016/01/03
- Re: Dynamic modules: MODULE_HANDLE_SIGNALS etc., Daniel Colascione, 2016/01/03
- Re: Dynamic modules: MODULE_HANDLE_SIGNALS etc., Paul Eggert, 2016/01/03
- Re: Dynamic modules: MODULE_HANDLE_SIGNALS etc., Daniel Colascione, 2016/01/03
- Re: Dynamic modules: MODULE_HANDLE_SIGNALS etc., John Wiegley, 2016/01/03
- Re: Dynamic modules: MODULE_HANDLE_SIGNALS etc., Paul Eggert, 2016/01/03
- Re: Dynamic modules: MODULE_HANDLE_SIGNALS etc., Daniel Colascione, 2016/01/03
- Re: Dynamic modules: MODULE_HANDLE_SIGNALS etc., Eli Zaretskii, 2016/01/04
- Re: Dynamic modules: MODULE_HANDLE_SIGNALS etc., Daniel Colascione, 2016/01/04
- Re: Dynamic modules: MODULE_HANDLE_SIGNALS etc.,
Eli Zaretskii <=
- Re: Dynamic modules: MODULE_HANDLE_SIGNALS etc., John Wiegley, 2016/01/04
- Re: Dynamic modules: MODULE_HANDLE_SIGNALS etc., Daniel Colascione, 2016/01/04
- Re: Dynamic modules: MODULE_HANDLE_SIGNALS etc., Daniel Colascione, 2016/01/04
- Re: Dynamic modules: MODULE_HANDLE_SIGNALS etc., John Wiegley, 2016/01/04
- Re: Dynamic modules: MODULE_HANDLE_SIGNALS etc., Eli Zaretskii, 2016/01/04
- Re: Dynamic modules: MODULE_HANDLE_SIGNALS etc., Daniel Colascione, 2016/01/04
- Re: Dynamic modules: MODULE_HANDLE_SIGNALS etc., Eli Zaretskii, 2016/01/04
Re: Dynamic modules: MODULE_HANDLE_SIGNALS etc., Eli Zaretskii, 2016/01/03