.

wcfs/wcfs.go

@@ -625,6 +625,11 @@ func (r *Root) zhandle1(zevent zodb.CommitEvent) {
 	}
 
 	// XXX resync .zhead to zevent.tid
+
+	// notify .wcfs/zhead
+	for fh := range gdebug.zhead.fhTab {
+		fh.Write(fmt.Sprintf("%s\n", zevent.tid))	// XXX -> fh = filesock
+	}
 }
 
 // invalidateBlk invalidates 1 file block.	XXX
@@ -1238,7 +1243,13 @@ func main() {
 	dotwcfs := nodefs.NewDefaultNode()
 	mkdir(root, ".wcfs", dotwcfs)
 	mkfile(dotwcfs, "zurl", NewStaticFile([]byte(zurl)))
-	// XXX zhead
+
+	// .wcfs/zhead - special file. If a user opens it, it will start to get
+	// tids of through whichzhead.at was, starting from the time when
+	// .wcfs/zhead was opened. There can be multiple openers. Once opened,
+	// the file must be read, as wcfs blocks waiting for data to be read.
+	// XXX text review.
+	mkfile(dotwcfs, "zhead", ...)
 
 	// TODO handle autoexit
 	_ = autoexit