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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.

package os

import (

        "runtime"

        "syscall"

)

// Process stores the information about a process created by StartProcess.

type Process struct {

        Pid    int

        handle uintptr

        done   bool // process has been successfuly waited on

}

func newProcess(pid int, handle uintptr) *Process {

        p := &Process{Pid: pid, handle: handle}

        runtime.SetFinalizer(p, (*Process).Release)

        return p

}

// ProcAttr holds the attributes that will be applied to a new process

// started by StartProcess.

type ProcAttr struct {

        // If Dir is non-empty, the child changes into the directory before

        // creating the process.

        Dir string

        // If Env is non-nil, it gives the environment variables for the

        // new process in the form returned by Environ.

        // If it is nil, the result of Environ will be used.

        Env []string

        // Files specifies the open files inherited by the new process.  The

        // first three entries correspond to standard input, standard output, and

        // standard error.  An implementation may support additional entries,

        // depending on the underlying operating system.  A nil entry corresponds

        // to that file being closed when the process starts.

        Files []*File

        // Operating system-specific process creation attributes.

        // Note that setting this field means that your program

        // may not execute properly or even compile on some

        // operating systems.

        Sys *syscall.SysProcAttr

}

// A Signal can represent any operating system signal.

type Signal interface {

        String() string

}

// Getpid returns the process id of the caller.

func Getpid() int { return syscall.Getpid() }

// Getppid returns the process id of the caller's parent.

func Getppid() int { return syscall.Getppid() }