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Message-ID: | <54DA32D9.5070909@redhat.com> |
Date: | Tue, 10 Feb 2015 09:33:29 -0700 |
From: | Eric Blake <eblake AT redhat DOT com> |
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To: | cygwin AT cygwin DOT com |
Subject: | Re: /dev/tty does not work from shell |
References: | <1598899839 DOT 20150209072327 AT yandex DOT ru> <54D8741A DOT 5020805 AT towo DOT net> <20150209113620 DOT F876DF38 DOT helmut DOT karlowski AT ish DOT de> <54D91AC6 DOT 8030101 AT towo DOT net> <54D91E53 DOT 5080907 AT redhat DOT com> <54DA31C1 DOT 9060406 AT redhat DOT com> |
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--INBf7pixIO9Qc5bJSeCCGj3VPdwxwvh88 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On 02/10/2015 09:28 AM, Eric Blake wrote: >=20 > The bug is in cygwin1.dll, not bash. Here's a STC; opening a file > should NOT change its st_ino number, but that's exactly what cygwin is > doing to /dev/tty. As such, bash thinks that because the ino changed > between stat() and open() that there is a race of someone trying to do > bad things behind bash's back, and noclobber restrictions kick in to > prevent bash from using the file. The same test from the command line: $ stat -c %i /dev/tty - 0>/dev/tty 327680 8912896 use any other (already-existing) file to see that the two numbers should normally be the same. --=20 Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org --INBf7pixIO9Qc5bJSeCCGj3VPdwxwvh88 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 Comment: Public key at http://people.redhat.com/eblake/eblake.gpg Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQEcBAEBCAAGBQJU2jLZAAoJEKeha0olJ0NqlCUH/21czReZSSvZ46zU2LpaDiHx 7HVb/S6WweU3T2zpGc5g11hIuKJ5B//Dkxzq9ruhEJiYMSBif/cDR1cTfnm+UA3y 3pyV8jkXvNI9eVJywbfCuh/5j05dU4jcPzqK0zJnRn/X7Oy+9h8dWUDMMa4sghxU nKSRK2eQKFYBRKI5YrKfUwJ1ZyhxduqO1x4XCxLejPK8DejHfsECx4HytXCW4wnl gdVArhpZRZ7l2MUhaujpHt3CzRNuKNnaQbnjUNViAWWCZj9kgrAaMO9prSb3ak/X hDBTYBAetRgeya4fpdSU+JOT3iddUByWYfguietcXpioJfFYCN+FLVJP+vdNTx4= =SRjv -----END PGP SIGNATURE----- --INBf7pixIO9Qc5bJSeCCGj3VPdwxwvh88--
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