Messages in this thread | | | Date | Fri, 6 Jun 2008 14:42:08 -0600 | From | Scott Wiersdorf <> | Subject | Re: [PATCH 2.6.25-4] getdelays.c: signal handling for log rotation |
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On Fri, Jun 06, 2008 at 03:59:09PM +0200, Andi Kleen wrote: > Scott Wiersdorf <scott@perlcode.org> writes: > > > This adds a USR1 signal handler to getdelays.c, which causes getdelays > > to close its logfile and reopen it (if '-w logfile' is > > specified). This is useful in situations when getdelays is running for > > a long time (i.e, the log file growing) and you need to rotate the > > logs but don't want to lose any log data. > > You could do the same by sending SIGSTOP; copy file; truncate file; SIGCONT
I believe it, but you can miss a lot of important stuff between STOP and CONT, especially on a busy system. With a single handler that reopens the file, you'll miss at most one netlink datum packet, and most of the time you'll miss nothing.
Scott -- Scott Wiersdorf <scott@bluehost.com>
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