为 boost 创建的共享内存设置权限

Setting permission for shared memory created by boost(为 boost 创建的共享内存设置权限)

问题描述

我们打开一个由这样的另一个进程创建的 boost 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，那么读取它的进程，如果是普通用户，就会失败，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?那就是把共享内存的权限给所有人?

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 构造函数，它需要一个 permissions 对象.boost::interprocess::permissions::set_unrestricted 可能就是你要找的

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this，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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