Allow stdin to work while profiling (#276)

* Allow stdin to work while profiling

* Added test

platform/v8.js

@@ -33,7 +33,7 @@ async function v8 (args) {
     '-r', path.join(__dirname, '..', 'lib', 'preload', 'soft-exit'),
     ...(onPort ? ['-r', path.join(__dirname, '..', 'lib', 'preload', 'detect-port.js')] : [])
   ].concat(args.argv), {
-    stdio: ['ignore', 'pipe', 'inherit', 'pipe', 'ignore', 'pipe']
+    stdio: ['inherit', 'pipe', 'inherit', 'pipe', 'ignore', 'pipe']
   })
 
   // Isolate log is created before command is executed

test/fixture/stdin.js

@@ -0,0 +1,12 @@
+#!/usr/bin/env node
+
+// Just echo the stdin content
+const run = async () => {
+  const results = []
+  for await (const chunk of process.stdin) {
+    results.push(chunk)
+  }
+  return results.join('')
+}
+
+run().then((s) => process.stdout.write(s))

test/read-stdin.test.js

@@ -0,0 +1,13 @@
+const { exec } = require('child_process')
+const { test } = require('tap')
+const fs = require('fs')
+
+test('should be able to profile commands that expect stdin', async t => {
+  return new Promise((resolve, reject) => {
+    exec('./cmd.js test/fixture/stdin.js < test/fixture/stdin.js', (error, stdout, stderr) => {
+      if (error) return reject(error)
+      t.equal(stdout, fs.readFileSync('test/fixture/stdin.js', 'utf8'))
+      resolve()
+    })
+  })
+})