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Date: | Wed, 25 Sep 2013 13:59:35 -0600 |
From: | Eric Blake <eblake AT redhat DOT com> |
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To: | cygwin AT cygwin DOT com |
Subject: | Re: [PATCH] tests: don't assume getdtablesize () <= 10000000 |
References: | <517EF2F1 DOT 2030802 AT cs DOT ucla DOT edu> <5241DBE6 DOT 4000007 AT redhat DOT com> <20130925043225 DOT GB1192 AT ednor DOT casa DOT cgf DOT cx> <5242D173 DOT 2020901 AT redhat DOT com> <20130925150416 DOT GB3361 AT ednor DOT casa DOT cgf DOT cx> <52430E95 DOT 1080208 AT redhat DOT com> |
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--ae6EORWn39ntFL1aLkOegUevgFOW1Imor Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 09/25/2013 10:25 AM, Eric Blake wrote: > On 09/25/2013 09:04 AM, Christopher Faylor wrote: >> >> Since you've previously made modifications in this area, why not supply >> a simple patch? >=20 > Ah - the joys of having write access. Yes, I'll post a patch for > discussion. What am I getting myself into? $ cat foo.c #include <stdio.h #include <unistd.h> int main(int argc, char **argv) { printf ("%d ", getdtablesize()); if (argc > 1) printf ("%d ", dup2 (0, getdtablesize() - 1)); printf ("%d\n", dup2 (0, getdtablesize())); return 0; } $ gcc -o foo -Wall -g foo.c $ ./foo Segmentation fault (core dumped) $ strace -o /dev/null ./foo 256 256 Heisenbug! The very act of trying to trace it makes it disappear :( $ ./foo 1 Segmentation fault (core dumped) $ strace -o /dev/null ./foo 1 22687 [main] foo 2020 open_stackdumpfile: Dumping stack trace to foo.exe.stackdump probably some off-by-one at a boundary case, but not as simple as I had originally hoped it would be. --=20 Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org --ae6EORWn39ntFL1aLkOegUevgFOW1Imor Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.14 (GNU/Linux) Comment: Public key at http://people.redhat.com/eblake/eblake.gpg Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQEbBAEBCAAGBQJSQ0CnAAoJEKeha0olJ0NqJt4H+LfOidGKC/2kGfhzeHBLTdX2 ByCM1QVEVLM9vRnnRFgIKxRvQ0Pre0Zx0YNsX19ENu0F3UpxHvohqkpm/E5Rishm V9X6s05ROZqw348DyJZagUbCNg8ppP2gqkzE5MKhYOYry0wSmU8IqRTBqQbJPK40 YjzoZ8+kgiYUVqsau04agWsiiziDKxCYhG63cY5Tw3z8iTNT1YrYZvuBv9M2vsdC eh2CgxHorv0SYj6ax/MvOHyZg9iCW2843ojy3Bb9xC2I2Hdy3dz4we8xEo9JFeDq O7Vfd35ARS6kYgaQ/RvD/w+orKV+pC+tETqO4WXtN4uNty/bnXd6iNoGdkL/Ng== =R+0i -----END PGP SIGNATURE----- --ae6EORWn39ntFL1aLkOegUevgFOW1Imor--
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