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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() }