- Make sure the message token returned by NgSendMsg() is non-negative

- Have NgSendAsciiMsg() return the same token as NgSendMsg()
- Document that NgSendMsg() and NgSendAsciiMsg() return the token
- Add MLINKS for the functions defined in netgraph(3)

lib/libnetgraph/Makefile

@@ -12,4 +12,16 @@ INCS=		netgraph.h
 
 CFLAGS+=	-Wall
 
+MLINKS+=	netgraph.3 NgMkSockNode.3
+MLINKS+=	netgraph.3 NgNameNode.3
+MLINKS+=	netgraph.3 NgSendMsg.3
+MLINKS+=	netgraph.3 NgSendAsciiMsg.3
+MLINKS+=	netgraph.3 NgSendMsgReply.3
+MLINKS+=	netgraph.3 NgRecvMsg.3
+MLINKS+=	netgraph.3 NgRecvAsciiMsg.3
+MLINKS+=	netgraph.3 NgSendData.3
+MLINKS+=	netgraph.3 NgRecvData.3
+MLINKS+=	netgraph.3 NgSetDebug.3
+MLINKS+=	netgraph.3 NgSetErrLog.3
+
 .include <bsd.lib.mk>

lib/libnetgraph/msg.c

@@ -70,7 +70,9 @@ NgSendMsg(int cs, const char *path,
 	memset(&msg, 0, sizeof(msg));
 	msg.header.version = NG_VERSION;
 	msg.header.typecookie = cookie;
-	msg.header.token = ++gMsgId;
+	if (++gMsgId < 0)
+		gMsgId = 1;
+	msg.header.token = gMsgId;
 	msg.header.flags = NGF_ORIG;
 	msg.header.cmd = cmd;
 	snprintf(msg.header.cmdstr, NG_CMDSTRLEN + 1, "cmd%d", cmd);
@@ -78,7 +80,7 @@ NgSendMsg(int cs, const char *path,
 	/* Deliver message */
 	if (NgDeliverMsg(cs, path, &msg, args, arglen) < 0)
 		return (-1);
-	return(gMsgId);
+	return (gMsgId);
 }
 
 /*
@@ -137,8 +139,13 @@ NgSendAsciiMsg(int cs, const char *path, const char *fmt, ...)
 		return (-1);
 
 	/* Now send binary version */
-	return NgDeliverMsg(cs,
-	    path, binary, binary->data, binary->header.arglen);
+	if (++gMsgId < 0)
+		gMsgId = 1;
+	binary->header.token = gMsgId;
+	if (NgDeliverMsg(cs,
+	    path, binary, binary->data, binary->header.arglen) < 0)
+		return (-1);
+	return (gMsgId);
 }
 
 /*

lib/libnetgraph/netgraph.3

@@ -124,6 +124,8 @@ The
 .Fa cmd ,
 and argument data are defined by the header file corresponding
 to the type of the node being addressed.
+The unique, non-negative token value chosen for use in the message
+header is returned.  This value is typically used to associate replies.
 .Pp
 Use
 .Fn NgSendMsgReply
@@ -147,6 +149,9 @@ string to the node in a
 control message.  The node returns a binary version of the
 message, which is then sent back to the node just as with
 .Fn NgSendMsg .
+As with
+.Fn NgSendMsg ,
+the message token value is returned.
 Note that
 .Tn ASCII
 conversion may not be supported by all node types.