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- // 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.
- //go:build aix || darwin || dragonfly || freebsd || hurd || (js && wasm) || linux || netbsd || openbsd || solaris
- package os
- import (
- "errors"
- "runtime"
- "syscall"
- "time"
- )
- func (p *Process) wait() (ps *ProcessState, err error) {
- if p.Pid == -1 {
- return nil, syscall.EINVAL
- }
- // If we can block until Wait4 will succeed immediately, do so.
- ready, err := p.blockUntilWaitable()
- if err != nil {
- return nil, err
- }
- if ready {
- // Mark the process done now, before the call to Wait4,
- // so that Process.signal will not send a signal.
- p.setDone()
- // Acquire a write lock on sigMu to wait for any
- // active call to the signal method to complete.
- p.sigMu.Lock()
- p.sigMu.Unlock()
- }
- var (
- status syscall.WaitStatus
- rusage syscall.Rusage
- pid1 int
- e error
- )
- for {
- pid1, e = syscall.Wait4(p.Pid, &status, 0, &rusage)
- if e != syscall.EINTR {
- break
- }
- }
- if e != nil {
- return nil, NewSyscallError("wait", e)
- }
- if pid1 != 0 {
- p.setDone()
- }
- ps = &ProcessState{
- pid: pid1,
- status: status,
- rusage: &rusage,
- }
- return ps, nil
- }
- func (p *Process) signal(sig Signal) error {
- if p.Pid == -1 {
- return errors.New("os: process already released")
- }
- if p.Pid == 0 {
- return errors.New("os: process not initialized")
- }
- p.sigMu.RLock()
- defer p.sigMu.RUnlock()
- if p.done() {
- return ErrProcessDone
- }
- s, ok := sig.(syscall.Signal)
- if !ok {
- return errors.New("os: unsupported signal type")
- }
- if e := syscall.Kill(p.Pid, s); e != nil {
- if e == syscall.ESRCH {
- return ErrProcessDone
- }
- return e
- }
- return nil
- }
- func (p *Process) release() error {
- // NOOP for unix.
- 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 unix.
- return newProcess(pid, 0), nil
- }
- func (p *ProcessState) userTime() time.Duration {
- return time.Duration(p.rusage.Utime.Nano()) * time.Nanosecond
- }
- func (p *ProcessState) systemTime() time.Duration {
- return time.Duration(p.rusage.Stime.Nano()) * time.Nanosecond
- }
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