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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"
"runtime"
"syscall"
"time"
"unsafe"
)
func (p *Process) wait() (ps *ProcessState, err error) {
s, e := syscall.WaitForSingleObject(syscall.Handle(p.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(p.handle), &ec)
if e != nil {
return nil, NewSyscallError("GetExitCodeProcess", e)
}
var u syscall.Rusage
e = syscall.GetProcessTimes(syscall.Handle(p.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. So we will sleep and smell the roses.
defer time.Sleep(5 * time.Millisecond)
defer p.Release()
return &ProcessState{p.Pid, syscall.WaitStatus{ExitCode: ec}, &u}, nil
}
func terminateProcess(pid, exitcode int) error {
h, e := syscall.OpenProcess(syscall.PROCESS_TERMINATE, false, uint32(pid))
if e != nil {
return NewSyscallError("OpenProcess", e)
}
defer syscall.CloseHandle(h)
e = syscall.TerminateProcess(h, uint32(exitcode))
return NewSyscallError("TerminateProcess", e)
}
func (p *Process) signal(sig Signal) error {
if p.handle == uintptr(syscall.InvalidHandle) {
return syscall.EINVAL
}
if p.done() {
return errors.New("os: process already finished")
}
if sig == Kill {
return terminateProcess(p.Pid, 1)
}
// TODO(rsc): Handle Interrupt too?
return syscall.Errno(syscall.EWINDOWS)
}
func (p *Process) release() error {
if p.handle == uintptr(syscall.InvalidHandle) {
return syscall.EINVAL
}
e := syscall.CloseHandle(syscall.Handle(p.handle))
if e != nil {
return NewSyscallError("CloseHandle", e)
}
p.handle = uintptr(syscall.InvalidHandle)
// 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() {
var argc int32
cmd := syscall.GetCommandLine()
argv, e := syscall.CommandLineToArgv(cmd, &argc)
if e != nil {
return
}
defer syscall.LocalFree(syscall.Handle(uintptr(unsafe.Pointer(argv))))
Args = make([]string, argc)
for i, v := range (*argv)[:argc] {
Args[i] = string(syscall.UTF16ToString((*v)[:]))
}
}
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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