A log file name may now be prefixed by a '-' if it should not be

explicitly fsynced after kernel messages are logged. This option
should be syntax compatible with a similar option in Linux syslogd.

I've made some small changes to Pekka's patch, hoepfully I haven't
goofed anything.

PR:		66790
Submitted by:	Pekka Savola <pekkas@netcore.fi>
Obtained from:	Martin Schulze's syslogd
MFC after:	1 month

1 files changed, 20 insertions, 0 deletions

diff --git a/usr.sbin/syslogd/syslog.conf.5 b/usr.sbin/syslogd/syslog.conf.5
index f13f1bf..789d63f 100644
--- a/usr.sbin/syslogd/syslog.conf.5
+++ b/usr.sbin/syslogd/syslog.conf.5
@@ -318,6 +318,22 @@ There are five forms:
 .It
 A pathname (beginning with a leading slash).
 Selected messages are appended to the file.
+.Pp
+To ensure that kernel messages are written to disk promptly,
+.Nm
+calls
+.Xr fsync 2
+after writing messages from the kernel.
+Other messages are not synced explicitly.
+You may prefix a pathname with the minus sign,
+.Dq - ,
+to forego syncing the specified file after every kernel message.
+Note that you might lose information if the system crashes
+immediately following a write attempt.
+Nevertheless, using the
+.Dq -
+option may improve performance,
+especially if the kernel is logging many messages.
 .It
 A hostname (preceded by an at
 .Pq Dq @
@@ -422,6 +438,10 @@ security.*						/var/log/security
 
 # Log all writes to /dev/console to a separate file.
 console.*						/var/log/console.log
+
+# Log ipfw messages without syncing after every message.
+!ipfw
+*.*							-/var/log/ipfw
 .Ed
 .Sh IMPLEMENTATION NOTES
 The