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  // Note that Process.handle is never nil because Windows always requires
    16  // a handle. A manually-created Process literal is not valid.
    17  
    18  func (p *Process) wait() (ps *ProcessState, err error) {
    19  	handle, status := p.handleTransientAcquire()
    20  	switch status {
    21  	case statusDone:
    22  		return nil, ErrProcessDone
    23  	case statusReleased:
    24  		return nil, syscall.EINVAL
    25  	}
    26  	defer p.handleTransientRelease()
    27  
    28  	s, e := syscall.WaitForSingleObject(syscall.Handle(handle), syscall.INFINITE)
    29  	switch s {
    30  	case syscall.WAIT_OBJECT_0:
    31  		break
    32  	case syscall.WAIT_FAILED:
    33  		return nil, NewSyscallError("WaitForSingleObject", e)
    34  	default:
    35  		return nil, errors.New("os: unexpected result from WaitForSingleObject")
    36  	}
    37  	var ec uint32
    38  	e = syscall.GetExitCodeProcess(syscall.Handle(handle), &ec)
    39  	if e != nil {
    40  		return nil, NewSyscallError("GetExitCodeProcess", e)
    41  	}
    42  	var u syscall.Rusage
    43  	e = syscall.GetProcessTimes(syscall.Handle(handle), &u.CreationTime, &u.ExitTime, &u.KernelTime, &u.UserTime)
    44  	if e != nil {
    45  		return nil, NewSyscallError("GetProcessTimes", e)
    46  	}
    47  
    48  	// For compatibility we use statusReleased here rather
    49  	// than statusDone.
    50  	p.doRelease(statusReleased)
    51  
    52  	return &ProcessState{p.Pid, syscall.WaitStatus{ExitCode: ec}, &u}, nil
    53  }
    54  
    55  func (p *Process) signal(sig Signal) error {
    56  	handle, status := p.handleTransientAcquire()
    57  	switch status {
    58  	case statusDone:
    59  		return ErrProcessDone
    60  	case statusReleased:
    61  		return syscall.EINVAL
    62  	}
    63  	defer p.handleTransientRelease()
    64  
    65  	if sig == Kill {
    66  		var terminationHandle syscall.Handle
    67  		e := syscall.DuplicateHandle(^syscall.Handle(0), syscall.Handle(handle), ^syscall.Handle(0), &terminationHandle, syscall.PROCESS_TERMINATE, false, 0)
    68  		if e != nil {
    69  			return NewSyscallError("DuplicateHandle", e)
    70  		}
    71  		runtime.KeepAlive(p)
    72  		defer syscall.CloseHandle(terminationHandle)
    73  		e = syscall.TerminateProcess(syscall.Handle(terminationHandle), 1)
    74  		return NewSyscallError("TerminateProcess", e)
    75  	}
    76  	// TODO(rsc): Handle Interrupt too?
    77  	return syscall.Errno(syscall.EWINDOWS)
    78  }
    79  
    80  func (ph *processHandle) closeHandle() {
    81  	syscall.CloseHandle(syscall.Handle(ph.handle))
    82  }
    83  
    84  func findProcess(pid int) (p *Process, err error) {
    85  	const da = syscall.STANDARD_RIGHTS_READ |
    86  		syscall.PROCESS_QUERY_INFORMATION | syscall.SYNCHRONIZE
    87  	h, e := syscall.OpenProcess(da, false, uint32(pid))
    88  	if e != nil {
    89  		return nil, NewSyscallError("OpenProcess", e)
    90  	}
    91  	return newHandleProcess(pid, uintptr(h)), nil
    92  }
    93  
    94  func init() {
    95  	cmd := windows.UTF16PtrToString(syscall.GetCommandLine())
    96  	if len(cmd) == 0 {
    97  		arg0, _ := Executable()
    98  		Args = []string{arg0}
    99  	} else {
   100  		Args = commandLineToArgv(cmd)
   101  	}
   102  }
   103  
   104  // appendBSBytes appends n '\\' bytes to b and returns the resulting slice.
   105  func appendBSBytes(b []byte, n int) []byte {
   106  	for ; n > 0; n-- {
   107  		b = append(b, '\\')
   108  	}
   109  	return b
   110  }
   111  
   112  // readNextArg splits command line string cmd into next
   113  // argument and command line remainder.
   114  func readNextArg(cmd string) (arg []byte, rest string) {
   115  	var b []byte
   116  	var inquote bool
   117  	var nslash int
   118  	for ; len(cmd) > 0; cmd = cmd[1:] {
   119  		c := cmd[0]
   120  		switch c {
   121  		case ' ', '\t':
   122  			if !inquote {
   123  				return appendBSBytes(b, nslash), cmd[1:]
   124  			}
   125  		case '"':
   126  			b = appendBSBytes(b, nslash/2)
   127  			if nslash%2 == 0 {
   128  				// use "Prior to 2008" rule from
   129  				// http://daviddeley.com/autohotkey/parameters/parameters.htm
   130  				// section 5.2 to deal with double double quotes
   131  				if inquote && len(cmd) > 1 && cmd[1] == '"' {
   132  					b = append(b, c)
   133  					cmd = cmd[1:]
   134  				}
   135  				inquote = !inquote
   136  			} else {
   137  				b = append(b, c)
   138  			}
   139  			nslash = 0
   140  			continue
   141  		case '\\':
   142  			nslash++
   143  			continue
   144  		}
   145  		b = appendBSBytes(b, nslash)
   146  		nslash = 0
   147  		b = append(b, c)
   148  	}
   149  	return appendBSBytes(b, nslash), ""
   150  }
   151  
   152  // commandLineToArgv splits a command line into individual argument
   153  // strings, following the Windows conventions documented
   154  // at http://daviddeley.com/autohotkey/parameters/parameters.htm#WINARGV
   155  func commandLineToArgv(cmd string) []string {
   156  	var args []string
   157  	for len(cmd) > 0 {
   158  		if cmd[0] == ' ' || cmd[0] == '\t' {
   159  			cmd = cmd[1:]
   160  			continue
   161  		}
   162  		var arg []byte
   163  		arg, cmd = readNextArg(cmd)
   164  		args = append(args, string(arg))
   165  	}
   166  	return args
   167  }
   168  
   169  func ftToDuration(ft *syscall.Filetime) time.Duration {
   170  	n := int64(ft.HighDateTime)<<32 + int64(ft.LowDateTime) // in 100-nanosecond intervals
   171  	return time.Duration(n*100) * time.Nanosecond
   172  }
   173  
   174  func (p *ProcessState) userTime() time.Duration {
   175  	return ftToDuration(&p.rusage.UserTime)
   176  }
   177  
   178  func (p *ProcessState) systemTime() time.Duration {
   179  	return ftToDuration(&p.rusage.KernelTime)
   180  }
   181
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