More files related to user-level file servers.
Also add acme!
diff --git a/src/lib9/pipe.c b/src/lib9/pipe.c
new file mode 100644
index 0000000..f9fe242
--- /dev/null
+++ b/src/lib9/pipe.c
@@ -0,0 +1,10 @@
+#include <u.h>
+#define NOPLAN9DEFINES
+#include <libc.h>
+#include <sys/socket.h>
+
+int
+p9pipe(int fd[2])
+{
+	return socketpair(AF_UNIX, SOCK_STREAM, 0, fd);
+}