Use err(3). Add usage.

Use syslog instead of fprintf when being a daemon.
Change sprintf to snprintf obtained from OpenBSD.
Obtained from: OpenBSD

1 files changed, 25 insertions, 10 deletions

diff --git a/usr.sbin/rwhod/rwhod.8 b/usr.sbin/rwhod/rwhod.8
index 19ca9ae..2b03ca3 100644
--- a/usr.sbin/rwhod/rwhod.8
+++ b/usr.sbin/rwhod/rwhod.8
@@ -58,14 +58,16 @@ As a producer of information it periodically
 queries the state of the system and constructs
 status messages which are broadcasted or multicasted on a network.
 As a consumer of information, it listens for other
-.Nm rwhod
+.Nm
 servers' status messages, validating them, then recording
 them in a collection of files located in the directory
 .Pa /var/rwho .
 .Pp
 The
 .Fl m
-option causes rwhod to use IP multicast (instead of
+option causes
+.Nm
+to use IP multicast (instead of
 broadcast) on all interfaces that have
 the IFF_MULTICAST flag set in their "ifnet" structs
 (excluding the loopback interface).  The multicast
@@ -76,9 +78,15 @@ If the optional
 .Ar ttl
 argument is supplied with the
 .Fl m
-flag, rwhod will send IP multicast datagrams with a
-time-to-live of <ttl>, via a SINGLE interface rather
-than all interfaces.  <ttl> must be between 0 and
+flag,
+.Nm
+will send IP multicast datagrams with a
+time-to-live of
+.Ar ttl ,
+via a SINGLE interface rather
+than all interfaces.
+.Ar ttl
+must be between 0 and
 32 (or MAX_MULTICAST_SCOPE).  Note that
 .Fl m Ar 1
 is different than
@@ -92,14 +100,21 @@ When
 is used without a
 .Ar ttl
 argument, the program accepts multicast
-rwhod reports from all multicast-capable interfaces.  If a
+.Nm
+reports from all multicast-capable interfaces.  If a
 .Ar ttl
 argument is given, it accepts multicast reports from only one interface, the
 one on which reports are sent (which may be controlled via the host's routing
-table).  Regardless of the "-m" option, the program accepts broadcast or
+table).  Regardless of the
+.Fl m
+option, the program accepts broadcast or
 unicast reports from all interfaces.  Thus, this program will hear the
-reports of old, non-multicasting rwhods, but, if multicasting is used,
-those old rwhods won't hear the reports generated by this program.
+reports of old, non-multicasting
+.Nm rwhod Ns s ,
+but, if multicasting is used,
+those old
+.Nm rwhod Ns s
+won't hear the reports generated by this program.
 .Pp
 The server transmits and receives messages at the port indicated
 in the ``rwho'' service specification; see 
@@ -153,7 +168,7 @@ in the message, contains any unprintable
 .Tn ASCII
 characters, the
 message is discarded.  Valid messages received by
-.Nm rwhod
+.Nm
 are placed in files named
 .Pa whod.hostname
 in the directory