On Mon, Dec 28, 2009 at 10:51:47PM -0600, Stan Hoeppner wrote:
> satishkumarp2k1 put forth on 12/28/2009 9:29 PM:
>
> > Yes, correct. All the alias files are generated using perl scripts, which
> > run periodically. The scripts actually generate temporary alias files (while
> > generating the aliases) and then just use "mv" command to the actual alias
> > file. Do you still think lookup might fail even in this case??
The "mv" is unsafe if it moves files across file-systems. Perl or C code
that uses system("mv $old $new") to rename(2) a file instead of using
the rename(2) system call (perldoc -f rename) is written by programmers
who should not be trusted with system code.
> How big is the alias file and how busy is this server?
This is not relevant. In-place rename(2) is atomic, and unless dbm(3)
files are used instead of Berkeley DB, smtpd(8) will not fail to find
recipients when an old indexed table is replaced by a new table, and the
recipient is present in both.
Programmers who use system("mv ...") cannot be trusted to write
robust code to update critical system configuration files.
--
Viktor.
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