Source file src/pkg/os/exec_unix.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	// +build darwin freebsd linux netbsd openbsd
     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.done = true
    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		s, ok := sig.(syscall.Signal)
    42		if !ok {
    43			return errors.New("os: unsupported signal type")
    44		}
    45		if e := syscall.Kill(p.Pid, s); e != nil {
    46			return e
    47		}
    48		return nil
    49	}
    50	
    51	func (p *Process) release() error {
    52		// NOOP for unix.
    53		p.Pid = -1
    54		// no need for a finalizer anymore
    55		runtime.SetFinalizer(p, nil)
    56		return nil
    57	}
    58	
    59	func findProcess(pid int) (p *Process, err error) {
    60		// NOOP for unix.
    61		return newProcess(pid, 0), nil
    62	}
    63	
    64	func (p *ProcessState) userTime() time.Duration {
    65		return time.Duration(p.rusage.Utime.Nano()) * time.Nanosecond
    66	}
    67	
    68	func (p *ProcessState) systemTime() time.Duration {
    69		return time.Duration(p.rusage.Stime.Nano()) * time.Nanosecond
    70	}