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// Copyright 2023 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Not all systems have syscall.Mkfifo.
//go:build !aix && !plan9 && !solaris && !wasm && !windows
package wasi_test
import (
"bufio"
"fmt"
"io"
"math/rand"
"os"
"os/exec"
"path/filepath"
"syscall"
"testing"
)
// This test creates a set of FIFOs and writes to them in reverse order. It
// checks that the output order matches the write order. The test binary opens
// the FIFOs in their original order and spawns a goroutine for each that reads
// from the FIFO and writes the result to stderr. If I/O was blocking, all
// goroutines would be blocked waiting for one read call to return, and the
// output order wouldn't match.
type fifo struct {
file *os.File
path string
}
func TestNonblock(t *testing.T) {
if target != "wasip1/wasm" {
t.Skip()
}
switch os.Getenv("GOWASIRUNTIME") {
case "wasmer":
t.Skip("wasmer does not support non-blocking I/O")
}
for _, mode := range []string{"os.OpenFile", "os.NewFile"} {
t.Run(mode, func(t *testing.T) {
args := []string{"run", "./testdata/nonblock.go", mode}
fifos := make([]*fifo, 8)
for i := range fifos {
path := filepath.Join(t.TempDir(), fmt.Sprintf("wasip1-nonblock-fifo-%d-%d", rand.Uint32(), i))
if err := syscall.Mkfifo(path, 0666); err != nil {
t.Fatal(err)
}
file, err := os.OpenFile(path, os.O_RDWR, 0)
if err != nil {
t.Fatal(err)
}
defer file.Close()
args = append(args, path)
fifos[len(fifos)-i-1] = &fifo{file, path}
}
subProcess := exec.Command("go", args...)
subProcess.Env = append(os.Environ(), "GOOS=wasip1", "GOARCH=wasm")
pr, pw := io.Pipe()
defer pw.Close()
subProcess.Stderr = pw
if err := subProcess.Start(); err != nil {
t.Fatal(err)
}
scanner := bufio.NewScanner(pr)
if !scanner.Scan() {
t.Fatal("expected line:", scanner.Err())
} else if scanner.Text() != "waiting" {
t.Fatal("unexpected output:", scanner.Text())
}
for _, fifo := range fifos {
if _, err := fifo.file.WriteString(fifo.path + "\n"); err != nil {
t.Fatal(err)
}
if !scanner.Scan() {
t.Fatal("expected line:", scanner.Err())
} else if scanner.Text() != fifo.path {
t.Fatal("unexpected line:", scanner.Text())
}
}
if err := subProcess.Wait(); err != nil {
t.Fatal(err)
}
})
}
}
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