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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.

// +build darwin freebsd linux netbsd openbsd

package os

import (
        "errors"
        "runtime"
        "syscall"
)

// Options for Wait.
const (
        WNOHANG   = syscall.WNOHANG   // Don't wait if no process has exited.
        WSTOPPED  = syscall.WSTOPPED  // If set, status of stopped subprocesses is also reported.
        WUNTRACED = syscall.WUNTRACED // Usually an alias for WSTOPPED.
        WRUSAGE   = 1 << 20           // Record resource usage.
)

// WRUSAGE must not be too high a bit, to avoid clashing with Linux's
// WCLONE, WALL, and WNOTHREAD flags, which sit in the top few bits of
// the options

// Wait waits for the Process to exit or stop, and then returns a
// Waitmsg describing its status and an error, if any. The options
// (WNOHANG etc.) affect the behavior of the Wait call.
func (p *Process) Wait(options int) (w *Waitmsg, err error) {
        if p.Pid == -1 {
                return nil, EINVAL
        }
        var status syscall.WaitStatus
        var rusage *syscall.Rusage
        if options&WRUSAGE != 0 {
                rusage = new(syscall.Rusage)
                options ^= WRUSAGE
        }
        pid1, e := syscall.Wait4(p.Pid, &status, options, rusage)
        if e != nil {
                return nil, NewSyscallError("wait", e)
        }
        // With WNOHANG pid is 0 if child has not exited.
        if pid1 != 0 && options&WSTOPPED == 0 {
                p.done = true
        }
        w = new(Waitmsg)
        w.Pid = pid1
        w.WaitStatus = status
        w.Rusage = rusage
        return w, nil
}

// Signal sends a signal to the Process.
func (p *Process) Signal(sig Signal) error {
        if p.done {
                return errors.New("os: process already finished")
        }
        if e := syscall.Kill(p.Pid, int(sig.(UnixSignal))); e != nil {
                return e
        }
        return nil
}

// Release releases any resources associated with the Process.
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
}