Make syslogd -u treat "*" as all levels by explictly setting pri_cmp

for it.

While I'm here, add a the ability to say "!level" in a way which
should be compatible with Linux's syslogd.

PR:		28935
No objections:	audit
MFC after:	2 weeks

1 files changed, 10 insertions, 1 deletions

diff --git a/usr.sbin/syslogd/syslog.conf.5 b/usr.sbin/syslogd/syslog.conf.5
index acf6ebce3468..18579a3054cd 100644
--- a/usr.sbin/syslogd/syslog.conf.5
+++ b/usr.sbin/syslogd/syslog.conf.5
@@ -85,7 +85,7 @@ are encoded as a
 a period
 .Pq Dq \&. ,
 an optional set of comparison flags
-.Pq Bq <=> ,
+.Pq Bo ! Bc Bq <=> ,
 and a
 .Em level ,
 with no intervening white-space.
@@ -123,6 +123,15 @@ list of a priority
 level equal or greater than
 .Em level
 will be logged.
+Comparison flags beginning with
+.Do ! Dc
+will have their logical sense inverted.
+Thus
+.Dq !=info
+means all levels except info and
+.Dq !notice
+has the same meaning as
+.Dq <notice .
 .Pp
 The
 .Em level