github.com/ader1990/go@v0.0.0-20140630135419-8c24447fa791/src/pkg/os/exec_unix.go (about)

     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  // +build darwin dragonfly freebsd linux nacl netbsd openbsd solaris
     6  
     7  package os
     8  
     9  import (
    10  	"errors"
    11  	"runtime"
    12  	"syscall"
    13  	"time"
    14  )
    15  
    16  func (p *Process) wait() (ps *ProcessState, err error) {
    17  	if p.Pid == -1 {
    18  		return nil, syscall.EINVAL
    19  	}
    20  	var status syscall.WaitStatus
    21  	var rusage syscall.Rusage
    22  	pid1, e := syscall.Wait4(p.Pid, &status, 0, &rusage)
    23  	if e != nil {
    24  		return nil, NewSyscallError("wait", e)
    25  	}
    26  	if pid1 != 0 {
    27  		p.setDone()
    28  	}
    29  	ps = &ProcessState{
    30  		pid:    pid1,
    31  		status: status,
    32  		rusage: &rusage,
    33  	}
    34  	return ps, nil
    35  }
    36  
    37  func (p *Process) signal(sig Signal) error {
    38  	if p.done() {
    39  		return errors.New("os: process already finished")
    40  	}
    41  	if p.Pid == -1 {
    42  		return errors.New("os: process already released")
    43  	}
    44  	s, ok := sig.(syscall.Signal)
    45  	if !ok {
    46  		return errors.New("os: unsupported signal type")
    47  	}
    48  	if e := syscall.Kill(p.Pid, s); e != nil {
    49  		return e
    50  	}
    51  	return nil
    52  }
    53  
    54  func (p *Process) release() error {
    55  	// NOOP for unix.
    56  	p.Pid = -1
    57  	// no need for a finalizer anymore
    58  	runtime.SetFinalizer(p, nil)
    59  	return nil
    60  }
    61  
    62  func findProcess(pid int) (p *Process, err error) {
    63  	// NOOP for unix.
    64  	return newProcess(pid, 0), nil
    65  }
    66  
    67  func (p *ProcessState) userTime() time.Duration {
    68  	return time.Duration(p.rusage.Utime.Nano()) * time.Nanosecond
    69  }
    70  
    71  func (p *ProcessState) systemTime() time.Duration {
    72  	return time.Duration(p.rusage.Stime.Nano()) * time.Nanosecond
    73  }