tree 3e5c1e0131b7939a565f73a80fa9bae2a7772250
parent 467d3010344d974f3051162d29f13f49c0eb8ea3
author Lei YU <mine260309@gmail.com> 1648606525 +0800
committer Lei YU <yulei.sh@bytedance.com> 1648730465 +0800

log_trim: Rotate log instead of truncate

When the log buffer file's size exceeds, the log_trim() was using
moving the file's content and truncate it to a specific size.
This results in a behavior that the log file is always changing its
whole content when log_trim() is called.

It could be better to change the behavior like logrotate, that move the
original file to a new one, and create a new log file for log buffer.
This way it makes sure that the log file is always appended with new
content and thus is friendly to rsyslog.

Tested: Verify rsyslog could use imfile module to handle this log file
        normally. Before this change, rsyslog will handle it incorrectly
	when log_trim() is called.

Signed-off-by: Lei YU <mine260309@gmail.com>
Change-Id: I7647b8e21747ea98f68e4bc7c5bbf1339354bd75