Introduce to the !program specification a capability similar to the one

that already exists for hosts: being able to specify a section that applies
to every program *except* the one in question.

The normal syntax for program specification is still valid. For the new
capability, one uses:

!-program

Since there is no way to specify a program beginning with a dash in the old
syntax, as it would be interpreted as the case above, the following
alternative syntax to the original capability is provided:

!+program

This shouldn't introduce incompatibilities with any syslogd configuration
in production because -stable's syslogd does not support a dash anywhere in
the program specification.

MFC after:	2 weeks

1 files changed, 11 insertions, 0 deletions

diff --git a/usr.sbin/syslogd/syslog.conf.5 b/usr.sbin/syslogd/syslog.conf.5
index 18579a3054cd..099b9cb0fc0c 100644
--- a/usr.sbin/syslogd/syslog.conf.5
+++ b/usr.sbin/syslogd/syslog.conf.5
@@ -185,6 +185,17 @@ specification for
 .Ql foo
 will also match any message logged by the kernel with the prefix
 .Ql "foo: " .
+The
+.Ql #!+prog
+or
+.Ql !+prog
+specification works just like the previous one,
+and the
+.Ql #!-prog
+or
+.Ql !-prog
+specification will match any message but the ones from that
+program.
 A
 .Em hostname
 specification of the form