看护进度之Sessions

 
创制其他Session(User)的经过要求得到对应Session的Token作为CreateProcessAsUser的参数来运转进度。 

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就可以在其余Session里面成立有System权限的历程了。

Sessions:是单个或两个经过组的3个聚集。

  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()创制3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
假设调用进度不是高管进程,函数setsid()会创制二个新的对话。起到多个功效:
  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 是开创会话的进度。
     The process is the only process in this new session.
     在新的对话中,调用进度是绝无仅有的长河。
  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高管进程。新历程组ID就是调用进度的历程ID。
  3.The process has no controlling terminal. (We’ll discuss controlling
terminals in the next section.)   
     调用经过没有决定终端。
     If the process had a controlling terminal before calling setsid,
that association is broken.
     在调用setsid()从前,若是调用进程有控制终端,
那么调用进度会脱离那几个决定终端。

 

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

即使调用进程已经是2个COO进度,则函数重临出错。
To ensure this is not the case, the usual practice is to call fork and
have the parent terminate and the child continue.
为了防止那种现象爆发,日常的做法是调用fork()使父进程终止,子进度继续运维。
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,
大家保险了子进度不是老板进度,因为父进度的历程组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3个新进度ID。由此,子进程ID等于它一连的经过组ID是不容许的。

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