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  	"internal/syscall/windows"
    10  	"runtime"
    11  	"syscall"
    12  	"time"
    13  )
    14  
    15  func (p *Process) wait() (ps *ProcessState, err error) {
    16  	handle := p.handle.Load()
    17  	s, e := syscall.WaitForSingleObject(syscall.Handle(handle), syscall.INFINITE)
    18  	switch s {
    19  	case syscall.WAIT_OBJECT_0:
    20  		break
    21  	case syscall.WAIT_FAILED:
    22  		return nil, NewSyscallError("WaitForSingleObject", e)
    23  	default:
    24  		return nil, errors.New("os: unexpected result from WaitForSingleObject")
    25  	}
    26  	var ec uint32
    27  	e = syscall.GetExitCodeProcess(syscall.Handle(handle), &ec)
    28  	if e != nil {
    29  		return nil, NewSyscallError("GetExitCodeProcess", e)
    30  	}
    31  	var u syscall.Rusage
    32  	e = syscall.GetProcessTimes(syscall.Handle(handle), &u.CreationTime, &u.ExitTime, &u.KernelTime, &u.UserTime)
    33  	if e != nil {
    34  		return nil, NewSyscallError("GetProcessTimes", e)
    35  	}
    36  	p.setDone()
    37  	defer p.Release()
    38  	return &ProcessState{p.Pid, syscall.WaitStatus{ExitCode: ec}, &u}, nil
    39  }
    40  
    41  func (p *Process) signal(sig Signal) error {
    42  	handle := p.handle.Load()
    43  	if handle == uintptr(syscall.InvalidHandle) {
    44  		return syscall.EINVAL
    45  	}
    46  	if p.done() {
    47  		return ErrProcessDone
    48  	}
    49  	if sig == Kill {
    50  		var terminationHandle syscall.Handle
    51  		e := syscall.DuplicateHandle(^syscall.Handle(0), syscall.Handle(handle), ^syscall.Handle(0), &terminationHandle, syscall.PROCESS_TERMINATE, false, 0)
    52  		if e != nil {
    53  			return NewSyscallError("DuplicateHandle", e)
    54  		}
    55  		runtime.KeepAlive(p)
    56  		defer syscall.CloseHandle(terminationHandle)
    57  		e = syscall.TerminateProcess(syscall.Handle(terminationHandle), 1)
    58  		return NewSyscallError("TerminateProcess", e)
    59  	}
    60  	// TODO(rsc): Handle Interrupt too?
    61  	return syscall.Errno(syscall.EWINDOWS)
    62  }
    63  
    64  func (p *Process) release() error {
    65  	handle := p.handle.Swap(uintptr(syscall.InvalidHandle))
    66  	if handle == uintptr(syscall.InvalidHandle) {
    67  		return syscall.EINVAL
    68  	}
    69  	e := syscall.CloseHandle(syscall.Handle(handle))
    70  	if e != nil {
    71  		return NewSyscallError("CloseHandle", e)
    72  	}
    73  	// no need for a finalizer anymore
    74  	runtime.SetFinalizer(p, nil)
    75  	return nil
    76  }
    77  
    78  func findProcess(pid int) (p *Process, err error) {
    79  	const da = syscall.STANDARD_RIGHTS_READ |
    80  		syscall.PROCESS_QUERY_INFORMATION | syscall.SYNCHRONIZE
    81  	h, e := syscall.OpenProcess(da, false, uint32(pid))
    82  	if e != nil {
    83  		return nil, NewSyscallError("OpenProcess", e)
    84  	}
    85  	return newProcess(pid, uintptr(h)), nil
    86  }
    87  
    88  func init() {
    89  	cmd := windows.UTF16PtrToString(syscall.GetCommandLine())
    90  	if len(cmd) == 0 {
    91  		arg0, _ := Executable()
    92  		Args = []string{arg0}
    93  	} else {
    94  		Args = commandLineToArgv(cmd)
    95  	}
    96  }
    97  
    98  // appendBSBytes appends n '\\' bytes to b and returns the resulting slice.
    99  func appendBSBytes(b []byte, n int) []byte {
   100  	for ; n > 0; n-- {
   101  		b = append(b, '\\')
   102  	}
   103  	return b
   104  }
   105  
   106  // readNextArg splits command line string cmd into next
   107  // argument and command line remainder.
   108  func readNextArg(cmd string) (arg []byte, rest string) {
   109  	var b []byte
   110  	var inquote bool
   111  	var nslash int
   112  	for ; len(cmd) > 0; cmd = cmd[1:] {
   113  		c := cmd[0]
   114  		switch c {
   115  		case ' ', '\t':
   116  			if !inquote {
   117  				return appendBSBytes(b, nslash), cmd[1:]
   118  			}
   119  		case '"':
   120  			b = appendBSBytes(b, nslash/2)
   121  			if nslash%2 == 0 {
   122  				// use "Prior to 2008" rule from
   123  				// http://daviddeley.com/autohotkey/parameters/parameters.htm
   124  				// section 5.2 to deal with double double quotes
   125  				if inquote && len(cmd) > 1 && cmd[1] == '"' {
   126  					b = append(b, c)
   127  					cmd = cmd[1:]
   128  				}
   129  				inquote = !inquote
   130  			} else {
   131  				b = append(b, c)
   132  			}
   133  			nslash = 0
   134  			continue
   135  		case '\\':
   136  			nslash++
   137  			continue
   138  		}
   139  		b = appendBSBytes(b, nslash)
   140  		nslash = 0
   141  		b = append(b, c)
   142  	}
   143  	return appendBSBytes(b, nslash), ""
   144  }
   145  
   146  // commandLineToArgv splits a command line into individual argument
   147  // strings, following the Windows conventions documented
   148  // at http://daviddeley.com/autohotkey/parameters/parameters.htm#WINARGV
   149  func commandLineToArgv(cmd string) []string {
   150  	var args []string
   151  	for len(cmd) > 0 {
   152  		if cmd[0] == ' ' || cmd[0] == '\t' {
   153  			cmd = cmd[1:]
   154  			continue
   155  		}
   156  		var arg []byte
   157  		arg, cmd = readNextArg(cmd)
   158  		args = append(args, string(arg))
   159  	}
   160  	return args
   161  }
   162  
   163  func ftToDuration(ft *syscall.Filetime) time.Duration {
   164  	n := int64(ft.HighDateTime)<<32 + int64(ft.LowDateTime) // in 100-nanosecond intervals
   165  	return time.Duration(n*100) * time.Nanosecond
   166  }
   167  
   168  func (p *ProcessState) userTime() time.Duration {
   169  	return ftToDuration(&p.rusage.UserTime)
   170  }
   171  
   172  func (p *ProcessState) systemTime() time.Duration {
   173  	return ftToDuration(&p.rusage.KernelTime)
   174  }
   175
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