new venti library.

src/libventi/hangup.c

@@ -0,0 +1,22 @@
+#include <u.h>
+#include <libc.h>
+#include <venti.h>
+#include "queue.h"
+
+void
+vthangup(VtConn *z)
+{
+	qlock(&z->lk);
+	z->state = VtStateClosed;
+	if(z->infd >= 0)
+		close(z->infd);
+	if(z->outfd >= 0 && z->outfd != z->infd)
+		close(z->outfd);
+	z->infd = -1;
+	z->outfd = -1;
+	if(z->writeq)
+		_vtqhangup(z->writeq);
+	if(z->readq)
+		_vtqhangup(z->readq);
+	qunlock(&z->lk);
+}