From: Andreas Schwab <schwab@suse.de>
To: Eli Zaretskii <eliz@gnu.org>
Cc: Vincent Lefevre <vincent@vinc17.net>, 18851@debbugs.gnu.org
Subject: bug#18851: 24.4; emacs cannot be started if the current directory has been removed
Date: Wed, 29 Oct 2014 16:39:22 +0100 [thread overview]
Message-ID: <mvmioj2lwb9.fsf@hawking.suse.de> (raw)
In-Reply-To: <83sii70xb7.fsf@gnu.org> (Eli Zaretskii's message of "Wed, 29 Oct 2014 16:23:24 +0200")
Eli Zaretskii <eliz@gnu.org> writes:
>> > > Note that the current directory can also be removed after Emacs
>> > > is started, so I expect that Emacs already supports cases like
>> > > that.
>> >
>> > No, it does not. Either the OS leaves the directory in existence
>> > until Emacs exits, or the OS prevents you from removing it.
>>
>> Linux does neither.
>
> AFAIK, GNU/Linux does the former. The directory is not physically
> removed until the last process that has an open file descriptor for it
> closes that descriptor. Any attempts to reference that directory for
> obtaining a new descriptor will get ENOENT, i.e. the OS pretends that
> the directory doesn't exist. But existing descriptors are valid, and
> can be used as usual.
"As usual" is an exaggeration. Basically the only valid operations on
it are fstat and fchdir. Any attempt at adding an entry to it (via
openat) will be rejected.
Andreas.
--
Andreas Schwab, SUSE Labs, schwab@suse.de
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE 1748 E4D4 88E3 0EEA B9D7
"And now for something completely different."
next prev parent reply other threads:[~2014-10-29 15:39 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-27 13:33 bug#18851: 24.4; emacs cannot be started if the current directory has been removed Vincent Lefevre
2014-10-28 21:34 ` Glenn Morris
2014-10-29 1:28 ` Vincent Lefevre
2014-10-29 3:50 ` Eli Zaretskii
2014-10-29 8:09 ` Vincent Lefevre
2014-10-29 12:57 ` Stefan Monnier
2014-10-29 14:27 ` Eli Zaretskii
2014-10-29 15:39 ` Vincent Lefevre
2014-10-29 16:07 ` Eli Zaretskii
2014-10-29 16:44 ` Vincent Lefevre
2014-10-29 16:15 ` Andreas Schwab
2014-10-29 16:51 ` Vincent Lefevre
2014-10-29 17:31 ` Andreas Schwab
2014-10-29 17:45 ` Vincent Lefevre
2014-10-29 18:23 ` Ivan Shmakov
2014-10-29 21:11 ` Andreas Schwab
2014-10-30 0:39 ` Stefan Monnier
2015-06-12 0:39 ` Glenn Morris
2015-06-12 7:53 ` Eli Zaretskii
2015-06-12 15:45 ` Glenn Morris
2015-06-12 19:31 ` Eli Zaretskii
2015-06-13 1:29 ` Glenn Morris
2015-06-13 7:56 ` Eli Zaretskii
2015-06-13 23:45 ` Glenn Morris
2014-10-29 14:23 ` Eli Zaretskii
2014-10-29 15:39 ` Andreas Schwab [this message]
2014-10-29 16:00 ` Eli Zaretskii
2014-10-29 16:05 ` Vincent Lefevre
2014-10-29 16:21 ` Eli Zaretskii
2014-10-29 3:40 ` Eli Zaretskii
2014-10-29 10:57 ` Emacs bugs at the Debian BTS Ivan Shmakov
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