El día sábado, noviembre 07, 2020 a las 02:23:28p. m. +0100, Oswald Buddenhagen
escribió:
> On Sat, Nov 07, 2020 at 01:06:00PM +0100, Matthias Apitz wrote:
> >There is only a small issue with the handling of SIGCHLD by Mutt which
> >leads to an error message by Mutt that the mail wasn't sent (to STDOUT),
> >which is not even true, because was sent fine.
> >
> >----- Forwarded message from "Kevin J. McCarthy" <ke...@8t8.us> -----
> >Mutt by default sets SIGCHLD to an empty signal handler function (for 1.8.3).
> >For more recent versions, the handler sets a global variable (which is used
> >for background editing process management).
> >
> >During the fork/exec process for sendmail (and other places), Mutt does set
> >up
> >SIG_BLOCK for SIGCHLD.
> >
> it's correct to do that around the fork(), but it strikes me as unwise
> to do the waitpid() with blocked sigchld - such practice was
> historically problematic, iirc.
>
> the proposed patch definitely isn't a good idea, as it just papers over
> the real problem, whatever it might be.
>
> fwiw, the incomplete errno handling around the waitpid() calls doesn't
> really help, though we know from the strace that it's indeed ECHILD in
> this case.
Can you please elaborate a bit what's not a good idea with this patch?
It deals exactly with returning waitpid() -1 and errno=ECHILD, i.e. with
the exact problem we have here, why ever the child was and/or SIG_CHLD was
lost. Thanks
matthias
--
Matthias Apitz, ✉ g...@unixarea.de, http://www.unixarea.de/ +49-176-38902045
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Lenin)
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