// file descriptors. Work around the problem by creating threads up front.
// See issue 25628.

package exec_test

import (
	"os"
	"sync"
	"syscall"
	"time"
)

func init() {
	if os.Getenv("GO_EXEC_TEST_PID") == "" {
		return
	}

	// Start some threads. 10 is arbitrary but intended to be enough
	// to ensure that the code won't have to create any threads itself.

//go:build ignore

// This is a test program that verifies that it can read from
// descriptor 3 and that no other descriptors are open.
// This is not done via TestHelperProcess and GO_EXEC_TEST_PID
// because we want to ensure that this program does not use cgo,
// because C libraries can open file descriptors behind our backs
// and confuse the test. See issue 25628.
package main

import (
	"fmt"

// package monkey-patches those variables before running tests).
func TestMain(m *testing.M) {
	flag.Parse()

	pid := os.Getpid()
	if os.Getenv("GO_EXEC_TEST_PID") == "" {
		os.Setenv("GO_EXEC_TEST_PID", strconv.Itoa(pid))

		if runtime.GOOS == "windows" {
			// Normalize environment so that test behavior is consistent.
			// (The behavior of LookPath varies depending on this variable.)
			//