1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
|
// Copyright (C) 2019-2023 Algorand, Inc.
// This file is part of go-algorand
//
// go-algorand is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// go-algorand is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with go-algorand. If not, see <https://www.gnu.org/licenses/>.
//go:build windows
// +build windows
package util
import (
"errors"
"os"
"syscall"
"unsafe"
"golang.org/x/sys/windows"
)
const (
ERROR_INVALID_PARAMETER = syscall.Errno(87)
STATUS_CANCELLED = uint32(0xC0000120)
processTerminateWaitInMs = 1000
killChildsPassCount = 4
)
var (
errFinishedProcess = errors.New("os: process already finished")
)
// FindProcess looks for a running process by its pid
func FindProcess(pid int) (*os.Process, error) {
var h syscall.Handle
process, err := os.FindProcess(pid)
if err != nil {
if isInvalidParameterError(err) { // NOTE: See function definition for details
return nil, nil
}
return nil, err
}
// If we have a process, check if it is terminated
h, err = syscall.OpenProcess(syscall.SYNCHRONIZE, false, uint32(pid))
if err == nil {
defer func() {
_ = syscall.CloseHandle(h)
}()
ret, e2 := syscall.WaitForSingleObject(h, 0)
if e2 == nil && ret == syscall.WAIT_OBJECT_0 {
return nil, nil
}
} else {
if isInvalidParameterError(err) { // NOTE: See function definition for details
return nil, nil
}
}
return process, nil
}
// KillProcess kills a running OS process
func KillProcess(pid int, signal os.Signal) error {
// Signal(0) only checks if we have access to kill a process and if it is really dead
if signal == syscall.Signal(0) {
return isProcessAlive(pid)
}
return killProcessTree(pid)
}
func isProcessAlive(pid int) error {
var ret uint32
h, err := syscall.OpenProcess(syscall.SYNCHRONIZE|syscall.PROCESS_TERMINATE, false, uint32(pid))
if err != nil {
if isInvalidParameterError(err) { // NOTE: See function definition for details
return errFinishedProcess
}
return err
}
ret, err = syscall.WaitForSingleObject(h, 0)
if err == nil && ret == syscall.WAIT_OBJECT_0 {
err = errFinishedProcess
}
_ = syscall.CloseHandle(h)
return err
}
func killProcessTree(pid int) error {
err := killProcess(pid)
if err != nil {
return err
}
// We do several passes just in case the process being killed spawns a new one
for pass := 1; pass <= killChildsPassCount; pass++ {
childProcessList := getChildProcesses(pid)
if len(childProcessList) == 0 {
break
}
for _, childPid := range childProcessList {
killProcessTree(childPid)
}
}
return nil
}
func getChildProcesses(pid int) []int {
var pe32 windows.ProcessEntry32
out := make([]int, 0)
snap, err := windows.CreateToolhelp32Snapshot(windows.TH32CS_SNAPPROCESS, uint32(0))
if err != nil {
return out
}
defer func() {
_ = windows.CloseHandle(snap)
}()
pe32.Size = uint32(unsafe.Sizeof(pe32))
err = windows.Process32First(snap, &pe32)
for err != nil {
if pe32.ParentProcessID == uint32(pid) {
// Add to list
out = append(out, int(pe32.ProcessID))
}
err = windows.Process32Next(snap, &pe32)
}
return out
}
func killProcess(pid int) error {
h, err := syscall.OpenProcess(syscall.SYNCHRONIZE|syscall.PROCESS_TERMINATE, false, uint32(pid))
if err == nil {
err = syscall.TerminateProcess(h, STATUS_CANCELLED)
if err == nil {
_, _ = syscall.WaitForSingleObject(h, processTerminateWaitInMs)
}
_ = syscall.CloseHandle(h)
}
return err
}
// NOTE: Unlike Unix, Windows tries to open the target process in order to kill it.
//
// ERROR_INVALID_PARAMETER is returned if the process does not exists.
// To mimic other OS behavior, if the process does not exist, don't return an error
func isInvalidParameterError(err error) bool {
var syscallError syscall.Errno
if errors.As(err, &syscallError) {
if syscallError == ERROR_INVALID_PARAMETER {
return true
}
}
return false
}
|
