医护进度之Sessions

 
创造其余Session(User)的进度须求获得相应Session的Token作为CreateProcessAsUser的参数来启动进程。 

Sessions:A session is a collection of one or more process groups.

 
修改有System权限的Token的TokenId为其余Session的TokenId就足以在其他Session里面成立有System权限的经过了。

Sessions:是单个或多个进度组的一个凑合。

  相关的Blog: https://blog.csdn.net/highyyy/article/details/6129769

process establishes a new session by calling the setsid function.
经过靠调用setsid()创设一个会话。
#include <unistd.h>
pid_t setsid(void);

If the calling process is not a process group leader, this function
creates a new session. Three things happen
如若调用进度不是总监进度,函数setsid()会创建一个新的对话。起到多少个效能:
  1.The process becomes the session leader of this new session. (A
session leader is the process that creates a session.) 
     调用经过成为新会话的the session
leader。A session leader 是创立会话的经过。
     The process is the only process in this new session.
     在新的对话中,调用进度是唯一的进程。
  2.The process becomes the process group leader of a new process group.
The new process group ID is the process ID of the calling process.
     调用经过成为新进度组的老总进度。新进程组ID就是调用进程的进程ID。
  3.The process has no controlling terminal. (We’ll discuss controlling
terminals in the next section.)   
     调用经过没有控制终端。
     If the process had a controlling terminal before calling setsid,
that association is broken.
     在调用setsid()以前,即使调用进度有控制终端,
那么调用进度会脱离这些决定终端。

 

This function returns an error if the caller is already a process group
leader. 

万一调用进度早已是一个首席营业官进程,则函数重返出错。
To ensure this is not the case, the usual practice is to call fork and
have the parent terminate and the child continue.
为了防止那种光景暴发,平日的做法是调用fork()使父进度终止,子进度继续运行。
We are guaranteed that the child is not a process group leader, because
the process group ID of the parent is inherited by the child,
大家有限支撑了子进程不是总监进度,因为父进度的进度组ID没有被子进度继续,
but the child gets a new process ID. Hence, it is impossible for the
child’s process ID to equal its inherited process group ID.
而子进度取得一个新历程ID。因而,子进度ID等于它继续的进度组ID是无法的。

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