为boost创建的共享内存设置权限 [英] Setting permission for shared memory created by boost

问题描述

我们打开由另一个过程创建的增强共享内存

We open a boost shared memory that was created by another process like this

  boost::interprocess::managed_shared_memory segment(boost::interprocess::open_only, "SharedMem");

但是，如果创建共享内存的进程是root用户，那么读取共享进程的过程(如果是普通用户)将失败，原因如下:

But if the process that created the shared memory was a root user, then the process reading it, if it was a normal user, will fail with the reason as:

terminate called after throwing an instance of 'boost::interprocess::interprocess_exception'
what():  Permission denied

我应该怎么做才能避免这种情况?那就是向所有人授予共享内存的权限?

What should i do to avoid this? that is to give permission to the shared memory to all?

推荐答案

如果您查看 shared_memory ，权限对象. boost::interprocess::permissions::set_unrestricted可能正是您要寻找的

If you look at the shared_memory constructor, it takes a permissions object. boost::interprocess::permissions::set_unrestricted is probably what you are looking for

void set_unrestricted();
//Sets permissions to unrestricted access:
//        A null DACL for windows or 0666 for UNIX.

根据此，它是在1.45版本中添加的

According to this, it was added in 1.45 version

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