> ------------------------------------------------------------
> revno: 3536
> revision-id: davi.arnaut@oracle.com-20110107183336-kp8niwm2hz3wb4c3
> parent: saikumar.v@sun.com-20110106103945-rhsek9uy6f63db44
> committer: Davi Arnaut <davi.arnaut@oracle.com>
> branch nick: 51023-5.1
> timestamp: Fri 2011-01-07 16:33:36 -0200
> message:
>   Bug#51023: Mysql server crashes on SIGHUP and destroys InnoDB files
>   
>   From a user perspective, the problem is that a FLUSH LOGS or SIGHUP
>   signal could end up associating the stdout and stderr to random
>   files. In the case of this bug report, the streams would end up
>   associated to InnoDB ibd files.
>   
>   The freopen(3) function is not thread-safe on FreeBSD. What this
>   means is that if another thread calls open(2) during freopen()
>   is executing that another thread's fd returned by open(2) may get
>   re-associated with the file being passed to freopen(3). See FreeBSD
>   PR number 79887 for reference:
>   
>     http://www.freebsd.org/cgi/query-pr.cgi?pr=79887
>   
>   This problem is worked around by substituting a internal hook within
>   the FILE structure. This avoids the loss of atomicity by not having
>   the original fd closed before its duplicated.
>   
>   Patch based on the original work by Vasil Dimov.