123 lines
3.4 KiB
Go
123 lines
3.4 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package os
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import (
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"errors"
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"runtime"
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"sync/atomic"
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"syscall"
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"time"
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"unsafe"
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)
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func (p *Process) wait() (ps *ProcessState, err error) {
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handle := atomic.LoadUintptr(&p.handle)
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s, e := syscall.WaitForSingleObject(syscall.Handle(handle), syscall.INFINITE)
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switch s {
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case syscall.WAIT_OBJECT_0:
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break
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case syscall.WAIT_FAILED:
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return nil, NewSyscallError("WaitForSingleObject", e)
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default:
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return nil, errors.New("os: unexpected result from WaitForSingleObject")
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}
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var ec uint32
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e = syscall.GetExitCodeProcess(syscall.Handle(handle), &ec)
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if e != nil {
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return nil, NewSyscallError("GetExitCodeProcess", e)
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}
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var u syscall.Rusage
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e = syscall.GetProcessTimes(syscall.Handle(handle), &u.CreationTime, &u.ExitTime, &u.KernelTime, &u.UserTime)
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if e != nil {
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return nil, NewSyscallError("GetProcessTimes", e)
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}
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p.setDone()
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// NOTE(brainman): It seems that sometimes process is not dead
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// when WaitForSingleObject returns. But we do not know any
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// other way to wait for it. Sleeping for a while seems to do
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// the trick sometimes. So we will sleep and smell the roses.
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defer time.Sleep(5 * time.Millisecond)
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defer p.Release()
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return &ProcessState{p.Pid, syscall.WaitStatus{ExitCode: ec}, &u}, nil
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}
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func terminateProcess(pid, exitcode int) error {
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h, e := syscall.OpenProcess(syscall.PROCESS_TERMINATE, false, uint32(pid))
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if e != nil {
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return NewSyscallError("OpenProcess", e)
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}
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defer syscall.CloseHandle(h)
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e = syscall.TerminateProcess(h, uint32(exitcode))
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return NewSyscallError("TerminateProcess", e)
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}
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func (p *Process) signal(sig Signal) error {
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handle := atomic.LoadUintptr(&p.handle)
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if handle == uintptr(syscall.InvalidHandle) {
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return syscall.EINVAL
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}
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if p.done() {
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return errors.New("os: process already finished")
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}
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if sig == Kill {
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return terminateProcess(p.Pid, 1)
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}
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// TODO(rsc): Handle Interrupt too?
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return syscall.Errno(syscall.EWINDOWS)
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}
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func (p *Process) release() error {
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handle := atomic.LoadUintptr(&p.handle)
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if handle == uintptr(syscall.InvalidHandle) {
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return syscall.EINVAL
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}
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e := syscall.CloseHandle(syscall.Handle(handle))
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if e != nil {
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return NewSyscallError("CloseHandle", e)
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}
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atomic.StoreUintptr(&p.handle, uintptr(syscall.InvalidHandle))
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// no need for a finalizer anymore
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runtime.SetFinalizer(p, nil)
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return nil
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}
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func findProcess(pid int) (p *Process, err error) {
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const da = syscall.STANDARD_RIGHTS_READ |
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syscall.PROCESS_QUERY_INFORMATION | syscall.SYNCHRONIZE
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h, e := syscall.OpenProcess(da, false, uint32(pid))
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if e != nil {
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return nil, NewSyscallError("OpenProcess", e)
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}
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return newProcess(pid, uintptr(h)), nil
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}
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func init() {
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var argc int32
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cmd := syscall.GetCommandLine()
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argv, e := syscall.CommandLineToArgv(cmd, &argc)
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if e != nil {
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return
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}
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defer syscall.LocalFree(syscall.Handle(uintptr(unsafe.Pointer(argv))))
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Args = make([]string, argc)
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for i, v := range (*argv)[:argc] {
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Args[i] = syscall.UTF16ToString((*v)[:])
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}
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}
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func ftToDuration(ft *syscall.Filetime) time.Duration {
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n := int64(ft.HighDateTime)<<32 + int64(ft.LowDateTime) // in 100-nanosecond intervals
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return time.Duration(n*100) * time.Nanosecond
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}
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func (p *ProcessState) userTime() time.Duration {
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return ftToDuration(&p.rusage.UserTime)
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}
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func (p *ProcessState) systemTime() time.Duration {
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return ftToDuration(&p.rusage.KernelTime)
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}
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