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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? > > 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. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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