// Copyright 2026 Alibaba Group
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

//go:build !windows

package helpers

import (
	"errors"
	"os"
	"syscall"
)

// processAlive reports whether pid refers to a live process. A permission
// error from the Unix signal-0 probe still proves that the process exists.
func processAlive(pid int) bool {
	if pid <= 0 {
		return false
	}
	proc, _ := os.FindProcess(pid)
	err := proc.Signal(syscall.Signal(0))
	return err == nil || errors.Is(err, syscall.EPERM)
}