I did not like the one sent in the previous patch. I think this
one is more clean and correct. I tried with acme and omero with
plumber and youps.

Notes:
Mon Nov 28 07:08:45 EST 2005 rsc
    Please be more careful about spacing.
    In almost every patch you submit, the spacing
    around () in if statements is not consistent
    with the surrounding code.
    


Reference: /n/sources/patch/applied/plumbopenwithcreate
Date: Mon Nov 21 15:59:39 CET 2005
Reviewed-by: rsc

--- /sys/src/libplumb/mesg.c	Mon Nov 21 15:59:06 2005
+++ /sys/src/libplumb/mesg.c	Mon Nov 21 15:59:03 2005
@@ -11,8 +11,12 @@
 	char *s;
 	char buf[128];
 
-	if(name[0] == '/')
-		return open(name, omode);
+	if(name[0] == '/'){
+		fd = open(name, omode);
+		if (fd < 0)
+			fd = create(name, omode, 0600);
+		return fd;
+	}
 	snprint(buf, sizeof buf, "/mnt/plumb/%s", name);
 	fd = open(buf, omode);
 	if(fd >= 0)
@@ -21,6 +25,11 @@
 	fd = open(buf, omode);
 	if(fd >= 0)
 		return fd;
+	snprint(buf, sizeof buf, "/mnt/plumb/%s", name);
+	fd = create(buf, omode, 0600);
+	if (fd >= 0)
+		return fd;
+
 	/* try mounting service */
 	s = getenv("plumbsrv");
 	if(s == nil)