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Source file src/os/exec_plan9.go

Documentation: os

  // 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"
  )
  
  // The only signal values guaranteed to be present on all systems
  // are Interrupt (send the process an interrupt) and Kill (force
  // the process to exit).
  var (
  	Interrupt Signal = syscall.Note("interrupt")
  	Kill      Signal = syscall.Note("kill")
  )
  
  func startProcess(name string, argv []string, attr *ProcAttr) (p *Process, err error) {
  	sysattr := &syscall.ProcAttr{
  		Dir: attr.Dir,
  		Env: attr.Env,
  		Sys: attr.Sys,
  	}
  
  	for _, f := range attr.Files {
  		sysattr.Files = append(sysattr.Files, f.Fd())
  	}
  
  	pid, h, e := syscall.StartProcess(name, argv, sysattr)
  	if e != nil {
  		return nil, &PathError{"fork/exec", name, e}
  	}
  
  	return newProcess(pid, h), nil
  }
  
  func (p *Process) writeProcFile(file string, data string) error {
  	f, e := OpenFile("/proc/"+itoa(p.Pid)+"/"+file, O_WRONLY, 0)
  	if e != nil {
  		return e
  	}
  	defer f.Close()
  	_, e = f.Write([]byte(data))
  	return e
  }
  
  func (p *Process) signal(sig Signal) error {
  	if p.done() {
  		return errors.New("os: process already finished")
  	}
  	if e := p.writeProcFile("note", sig.String()); e != nil {
  		return NewSyscallError("signal", e)
  	}
  	return nil
  }
  
  func (p *Process) kill() error {
  	return p.signal(Kill)
  }
  
  func (p *Process) wait() (ps *ProcessState, err error) {
  	var waitmsg syscall.Waitmsg
  
  	if p.Pid == -1 {
  		return nil, ErrInvalid
  	}
  	err = syscall.WaitProcess(p.Pid, &waitmsg)
  	if err != nil {
  		return nil, NewSyscallError("wait", err)
  	}
  
  	p.setDone()
  	ps = &ProcessState{
  		pid:    waitmsg.Pid,
  		status: &waitmsg,
  	}
  	return ps, nil
  }
  
  func (p *Process) release() error {
  	// NOOP for Plan 9.
  	p.Pid = -1
  	// no need for a finalizer anymore
  	runtime.SetFinalizer(p, nil)
  	return nil
  }
  
  func findProcess(pid int) (p *Process, err error) {
  	// NOOP for Plan 9.
  	return newProcess(pid, 0), nil
  }
  
  // ProcessState stores information about a process, as reported by Wait.
  type ProcessState struct {
  	pid    int              // The process's id.
  	status *syscall.Waitmsg // System-dependent status info.
  }
  
  // Pid returns the process id of the exited process.
  func (p *ProcessState) Pid() int {
  	return p.pid
  }
  
  func (p *ProcessState) exited() bool {
  	return p.status.Exited()
  }
  
  func (p *ProcessState) success() bool {
  	return p.status.ExitStatus() == 0
  }
  
  func (p *ProcessState) sys() interface{} {
  	return p.status
  }
  
  func (p *ProcessState) sysUsage() interface{} {
  	return p.status
  }
  
  func (p *ProcessState) userTime() time.Duration {
  	return time.Duration(p.status.Time[0]) * time.Millisecond
  }
  
  func (p *ProcessState) systemTime() time.Duration {
  	return time.Duration(p.status.Time[1]) * time.Millisecond
  }
  
  func (p *ProcessState) String() string {
  	if p == nil {
  		return "<nil>"
  	}
  	return "exit status: " + p.status.Msg
  }
  

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