创设属于其余Session的过程

 
创造其余Session(User)的历程要求拿到对应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为别的Session的TokenId就能够在任何Session里面创制有System权限的进度了。

Sessions:是单个或多少个进程组的二个聚众。

  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()创造三个对话。
#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
设若调用进度不是首席营业官进度,函数setsid()会创建三个新的对话。起到八个效益:
  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 是创建会话的长河。
     The process is the only process in this new session.
     在新的对话中,调用进度是唯一的经过。
  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.
     调用经过成为新历程组的总经理进度。新进程组ID正是调用进程的经过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()在此以前,要是调用进度有决定终端,
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. 

假使调用进度一度是3个COO进程,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.
为了防止那种情况爆发,平日的做法是调用fork()使父进程终止,子进度继续运转。
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,
咱们保险了子进度不是首席营业官进度,因为父进程的进度组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.
而子进度取得多少个新进程ID。因而,子进度ID等于它一连的进度组ID是不或许的。

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