Re: Log rotation

Bruce Momjian wrote:

>Which basically shows one fsync, no O_SYNC's, and setting of the flag
>only for klog reads.
>
>

Which sysklogd do you look at? The version from RedHat 9 contains this
block:

> /*
> * Crack a configuration file line
> */
>
> void cfline(line, f)
> char *line;
> register struct filed *f;
> {
> register char *p;
> [snip]
> if (*p == '-')
> {
> syncfile = 0;
> p++;
> } else
> syncfile = 1;
> [snip]
> if (syncfile)
> f->f_flags |= SYNC_FILE;

And the the fsync depends on SYNC_FILE. As documented in man syslog.conf:

> You may prefix each entry with the minus ``-'' sign to omit
> syncing the
> file after every logging. Note that you might lose
> information if the
> system crashes right behind a write attempt. Nevertheless
> this might
> give you back some performance, especially if you run programs
> that use
> logging in a very verbose manner.

It's sysklogd-1.4.1rh, I'm not sure what part of it are Redhat specific.

--
Manfred