You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: testenv_unix.go
    path of file: ./repos/hugo/tpl/internal/go_templates/testenv
    
    the code of the file until where you have to start completion: // Copyright 2021 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.

//go:build unix

package testenv

import (
	"errors"
	"io/fs"
	"syscall"
)

// Sigquit is the signal to send to kill a hanging subprocess.
// Send SIGQUIT to get a stack trace.
var Sigquit = syscall.SIGQUIT

func syscallIsNotSupported(err error) bool {
	if err == nil {
		return false
	}

	var er
    
func syscallIsNotSupported(err error) bool {
	if err == nil {
		return false
	}

	var errno syscall.Errno
	if errors.As(err, &errno) {
		switch errno {
		case syscall.EPERM, syscall.EROFS:
			// User lacks permission: either the call requires root permission and the
			// user is not root, or the call is denied by a container security policy.
			return true
		case syscall.EINVAL:
			// Some containers return EINVAL instead of EPERM if a system call is
			// denied by security policy.
			return true
		}
	}

	if errors.Is(err, fs.ErrPermission) {
		return true
	}

	return false
}