From 4d582234226f9c25cab6bfee5f4564dfaa9409e1 Mon Sep 17 00:00:00 2001
From: Josh Bleecher Snyder <josh@tailscale.com>
Date: Thu, 3 Jun 2021 14:19:24 -0700
Subject: [PATCH] switch file.go to test reads instead of writes

---
 file.go | 37 +++++++++++++++++--------------------
 1 file changed, 17 insertions(+), 20 deletions(-)

diff --git a/file.go b/file.go
index 5804c73c5..ba9c4ca19 100644
--- a/file.go
+++ b/file.go
@@ -1,37 +1,34 @@
 package main
 
 import (
-	"fmt"
 	"os"
-	"syscall"
-	"time"
 
 	"tailscale.com/net/uring"
 )
 
 func main() {
-	// f, err := os.Create("junk")
-	// check(err)
-	// _, err = f.Write([]byte("CMON\n"))
-	// check(err)
+	const msg = "hello, I am here\n"
+	err := os.WriteFile("junk", []byte(msg), 0644)
+	check(err)
 
-	fd, err := syscall.Open("trash", syscall.O_RDWR|syscall.O_CREAT|syscall.O_TRUNC, 0644)
+	f, err := os.Open("junk")
 	check(err)
-	n, err := syscall.Write(int(fd), []byte("part two\n"))
-	check(err)
-	fmt.Println("N", n)
+	defer f.Close()
 
-	ff := os.NewFile(uintptr(fd), "trash")
-	uf, err := uring.NewFile(ff)
+	uf, err := uring.NewFile(f)
 	check(err)
-	for i := 0; i < 1; i++ {
-		s := fmt.Sprintf("i can count to %d\x00\n", i)
-		n, err := uf.Write([]byte(s), n)
-		check(err)
-		fmt.Println("wrote", n, "bytes")
-		time.Sleep(3 * time.Second)
+	for i := 0; i < 1000; i++ {
+		go func() {
+			buf := make([]byte, 100)
+			n, err := uf.Read(buf)
+			check(err)
+			if n != len(msg) || string(buf[:n]) != msg {
+				panic("OOPS")
+			}
+		}()
 	}
-	syscall.Close(fd)
+	// fmt.Println("read", n, "bytes")
+	// fmt.Println(string(buf[:n]))
 }
 
 func check(err error) {