linux – 标识符PID,PPID,SID,PGID,UID,EUID是什么意思？

概述我被分配到 Write a C program that prints the following identifiers PID, PPID, SID, PGID, UID, EUID. 然后,作业继续询问 What represents each identifier? 我已完成该程序,但尚未找到有关标识符的充分解释. >他们真正代表什么？ >特别是SID和PGID标识符的用途是什么？ 他们如 我被分配到

Write a C program that prints the following IDentifIErs PID,PPID,SID,PGID,UID,EUID.

然后,作业继续询问

What represents each IDentifIEr?

我已完成该程序,但尚未找到有关标识符的充分解释.

>他们真正代表什么？
>特别是SID和PGID标识符的用途是什么？

解决方法 他们如下

> PID – 进程ID
> PPID – 父进程ID
> SID – 会话ID
> PGID – 流程组ID
> UID – 用户ID
> EUID – Effective User ID

看看this SO Post和第一个答案,以便对它们的用途进行健康的解释.

从他们发布的推荐定义页面
http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html

3.270父进程ID

An attribute of a new process IDentifying the parent of the process. The parent process ID of a process is the process ID of its creator,for the lifetime of the creator. After the creator’s lifetime has ended,the parent process ID is the process ID of an implementation-@R_403_5552@d system process.

3.343会议

A collection of process groups established for job control purposes. Each process group is a member of a session. A process is consIDered to be a member of the session of which its process group is a member. A newly created process joins the session of its creator. A process can alter its session membership; see setsID(). There can be multiple process groups in the same session.

3.296过程组

A collection of processes that permits the signaling of related processes. Each process in the system is a member of a process group that is IDentifIEd by a process group ID. A newly created process joins the process group of its creator.

3.297进程组ID

The unique positive integer IDentifIEr representing a process group during its lifetime.

3.142有效用户ID

An attribute of a process that is used in determining varIoUs permissions,including file access permissions; see also User ID.

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