libgo/go/os/exec_windows.go

   1 // Copyright 2009 The Go Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 package os
   6
   7 import (
   8         "errors"
   9         "runtime"
  10         "syscall"
  11         "time"
  12         "unsafe"
  13 )
  14
  15 func (p *Process) wait() (ps *ProcessState, err error) {
  16         s, e := syscall.WaitForSingleObject(syscall.Handle(p.handle), syscall.INFINITE)
  17         switch s {
  18         case syscall.WAIT_OBJECT_0:
  19                 break
  20         case syscall.WAIT_FAILED:
  21                 return nil, NewSyscallError("WaitForSingleObject", e)
  22         default:
  23                 return nil, errors.New("os: unexpected result from WaitForSingleObject")
  24         }
  25         var ec uint32
  26         e = syscall.GetExitCodeProcess(syscall.Handle(p.handle), &ec)
  27         if e != nil {
  28                 return nil, NewSyscallError("GetExitCodeProcess", e)
  29         }
  30         var u syscall.Rusage
  31         e = syscall.GetProcessTimes(syscall.Handle(p.handle), &u.CreationTime, &u.ExitTime, &u.KernelTime, &u.UserTime)
  32         if e != nil {
  33                 return nil, NewSyscallError("GetProcessTimes", e)
  34         }
  35         p.setDone()
  36         // NOTE(brainman): It seems that sometimes process is not dead
  37         // when WaitForSingleObject returns. But we do not know any
  38         // other way to wait for it. Sleeping for a while seems to do
  39         // the trick sometimes. So we will sleep and smell the roses.
  40         defer time.Sleep(5 * time.Millisecond)
  41         defer p.Release()
  42         return &ProcessState{p.Pid, syscall.WaitStatus{ExitCode: ec}, &u}, nil
  43 }
  44
  45 func terminateProcess(pid, exitcode int) error {
  46         h, e := syscall.OpenProcess(syscall.PROCESS_TERMINATE, false, uint32(pid))
  47         if e != nil {
  48                 return NewSyscallError("OpenProcess", e)
  49         }
  50         defer syscall.CloseHandle(h)
  51         e = syscall.TerminateProcess(h, uint32(exitcode))
  52         return NewSyscallError("TerminateProcess", e)
  53 }
  54
  55 func (p *Process) signal(sig Signal) error {
  56         if p.done() {
  57                 return errors.New("os: process already finished")
  58         }
  59         if sig == Kill {
  60                 return terminateProcess(p.Pid, 1)
  61         }
  62         // TODO(rsc): Handle Interrupt too?
  63         return syscall.Errno(syscall.EWINDOWS)
  64 }
  65
  66 func (p *Process) release() error {
  67         if p.handle == uintptr(syscall.InvalidHandle) {
  68                 return syscall.EINVAL
  69         }
  70         e := syscall.CloseHandle(syscall.Handle(p.handle))
  71         if e != nil {
  72                 return NewSyscallError("CloseHandle", e)
  73         }
  74         p.handle = uintptr(syscall.InvalidHandle)
  75         // no need for a finalizer anymore
  76         runtime.SetFinalizer(p, nil)
  77         return nil
  78 }
  79
  80 func findProcess(pid int) (p *Process, err error) {
  81         const da = syscall.STANDARD_RIGHTS_READ |
  82                 syscall.PROCESS_QUERY_INFORMATION | syscall.SYNCHRONIZE
  83         h, e := syscall.OpenProcess(da, false, uint32(pid))
  84         if e != nil {
  85                 return nil, NewSyscallError("OpenProcess", e)
  86         }
  87         return newProcess(pid, uintptr(h)), nil
  88 }
  89
  90 func init() {
  91         var argc int32
  92         cmd := syscall.GetCommandLine()
  93         argv, e := syscall.CommandLineToArgv(cmd, &argc)
  94         if e != nil {
  95                 return
  96         }
  97         defer syscall.LocalFree(syscall.Handle(uintptr(unsafe.Pointer(argv))))
  98         Args = make([]string, argc)
  99         for i, v := range (*argv)[:argc] {
 100                 Args[i] = string(syscall.UTF16ToString((*v)[:]))
 101         }
 102 }
 103
 104 func ftToDuration(ft *syscall.Filetime) time.Duration {
 105         n := int64(ft.HighDateTime)<<32 + int64(ft.LowDateTime) // in 100-nanosecond intervals
 106         return time.Duration(n*100) * time.Nanosecond
 107 }
 108
 109 func (p *ProcessState) userTime() time.Duration {
 110         return ftToDuration(&p.rusage.UserTime)
 111 }
 112
 113 func (p *ProcessState) systemTime() time.Duration {
 114         return ftToDuration(&p.rusage.KernelTime)
 115 }