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Re: rolling over high-traffic logfiles?

X-seq: zsh-users 1680
From: Zefram <zefram@xxxxxxxxx>
To: schaefer@xxxxxxxxxxxxxxxx (Bart Schaefer)
Subject: Re: rolling over high-traffic logfiles?
Date: Thu, 16 Jul 1998 17:14:28 +0100 (BST)
Cc: zsh-users@xxxxxxxxxxxxxxx, sweth@xxxxxxxxxxxxxxxxxxxx
In-reply-to: <980716082633.ZM15563@xxxxxxxxxxxxxxxxxxxxxxx> from "Bart Schaefer" at Jul 16, 98 08:26:32 am

Bart Schaefer wrote:
>} mv should use rename() to atomically replace the log file, in which case
>} there is no race condition.
>
>Fair enough.  There are two or more filesystem operations necessary even
>if only only system call, but I suppose that's only a possible problem
>on a multiprocessor system.

POSIX.1 defines rename() to be atomic, as is historical practice.
On multiprocessor systems the kernel just has to take a little extra care.
POSIX.2 defines mv to behave as if it were calling rename().

-zefram

Follow-Ups:
- Re: rolling over high-traffic logfiles?
  - From: Nitin P Garg

References:
- Re: rolling over high-traffic logfiles?
  - From: Bart Schaefer

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