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// Copyright 2009 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.
package os
import (
"errors"
"internal/syscall/windows"
"runtime"
"sync/atomic"
"syscall"
"time"
)
func (p *Process) wait() (ps *ProcessState, err error) {
handle := atomic.LoadUintptr(&p.handle)
s, e := syscall.WaitForSingleObject(syscall.Handle(handle), syscall.INFINITE)
switch s {
case syscall.WAIT_OBJECT_0:
break
case syscall.WAIT_FAILED:
return nil, NewSyscallError("WaitForSingleObject", e)
default:
return nil, errors.New("os: unexpected result from WaitForSingleObject")
}
var ec uint32
e = syscall.GetExitCodeProcess(syscall.Handle(handle), &ec)
if e != nil {
return nil, NewSyscallError("GetExitCodeProcess", e)
}
var u syscall.Rusage
e = syscall.GetProcessTimes(syscall.Handle(handle), &u.CreationTime, &u.ExitTime, &u.KernelTime, &u.UserTime)
if e != nil {
return nil, NewSyscallError("GetProcessTimes", e)
}
p.setDone()
// NOTE(brainman): It seems that sometimes process is not dead
// when WaitForSingleObject returns. But we do not know any
// other way to wait for it. Sleeping for a while seems to do
// the trick sometimes.
// See https://golang.org/issue/25965 for details.
defer time.Sleep(5 * time.Millisecond)
defer p.Release()
return &ProcessState{p.Pid, syscall.WaitStatus{ExitCode: ec}, &u}, nil
}
func (p *Process) signal(sig Signal) error {
handle := atomic.LoadUintptr(&p.handle)
if handle == uintptr(syscall.InvalidHandle) {
return syscall.EINVAL
}
if p.done() {
return ErrProcessDone
}
if sig == Kill {
var terminationHandle syscall.Handle
e := syscall.DuplicateHandle(^syscall.Handle(0), syscall.Handle(handle), ^syscall.Handle(0), &terminationHandle, syscall.PROCESS_TERMINATE, false, 0)
if e != nil {
return NewSyscallError("DuplicateHandle", e)
}
runtime.KeepAlive(p)
defer syscall.CloseHandle(terminationHandle)
e = syscall.TerminateProcess(syscall.Handle(terminationHandle), 1)
return NewSyscallError("TerminateProcess", e)
}
// TODO(rsc): Handle Interrupt too?
return syscall.Errno(syscall.EWINDOWS)
}
func (p *Process) release() error {
handle := atomic.SwapUintptr(&p.handle, uintptr(syscall.InvalidHandle))
if handle == uintptr(syscall.InvalidHandle) {
return syscall.EINVAL
}
e := syscall.CloseHandle(syscall.Handle(handle))
if e != nil {
return NewSyscallError("CloseHandle", e)
}
// no need for a finalizer anymore
runtime.SetFinalizer(p, nil)
return nil
}
func findProcess(pid int) (p *Process, err error) {
const da = syscall.STANDARD_RIGHTS_READ |
syscall.PROCESS_QUERY_INFORMATION | syscall.SYNCHRONIZE
h, e := syscall.OpenProcess(da, false, uint32(pid))
if e != nil {
return nil, NewSyscallError("OpenProcess", e)
}
return newProcess(pid, uintptr(h)), nil
}
func init() {
cmd := windows.UTF16PtrToString(syscall.GetCommandLine())
if len(cmd) == 0 {
arg0, _ := Executable()
Args = []string{arg0}
} else {
Args = commandLineToArgv(cmd)
}
}
// appendBSBytes appends n '\\' bytes to b and returns the resulting slice.
func appendBSBytes(b []byte, n int) []byte {
for ; n > 0; n-- {
b = append(b, '\\')
}
return b
}
// readNextArg splits command line string cmd into next
// argument and command line remainder.
func readNextArg(cmd string) (arg []byte, rest string) {
var b []byte
var inquote bool
var nslash int
for ; len(cmd) > 0; cmd = cmd[1:] {
c := cmd[0]
switch c {
case ' ', '\t':
if !inquote {
return appendBSBytes(b, nslash), cmd[1:]
}
case '"':
b = appendBSBytes(b, nslash/2)
if nslash%2 == 0 {
// use "Prior to 2008" rule from
// http://daviddeley.com/autohotkey/parameters/parameters.htm
// section 5.2 to deal with double double quotes
if inquote && len(cmd) > 1 && cmd[1] == '"' {
b = append(b, c)
cmd = cmd[1:]
}
inquote = !inquote
} else {
b = append(b, c)
}
nslash = 0
continue
case '\\':
nslash++
continue
}
b = appendBSBytes(b, nslash)
nslash = 0
b = append(b, c)
}
return appendBSBytes(b, nslash), ""
}
// commandLineToArgv splits a command line into individual argument
// strings, following the Windows conventions documented
// at http://daviddeley.com/autohotkey/parameters/parameters.htm#WINARGV
func commandLineToArgv(cmd string) []string {
var args []string
for len(cmd) > 0 {
if cmd[0] == ' ' || cmd[0] == '\t' {
cmd = cmd[1:]
continue
}
var arg []byte
arg, cmd = readNextArg(cmd)
args = append(args, string(arg))
}
return args
}
func ftToDuration(ft *syscall.Filetime) time.Duration {
n := int64(ft.HighDateTime)<<32 + int64(ft.LowDateTime) // in 100-nanosecond intervals
return time.Duration(n*100) * time.Nanosecond
}
func (p *ProcessState) userTime() time.Duration {
return ftToDuration(&p.rusage.UserTime)
}
func (p *ProcessState) systemTime() time.Duration {
return ftToDuration(&p.rusage.KernelTime)
}
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