设置boost创建的共享内存的权限

发布于 2024-12-25 04:09:40 字数 402 浏览 0 评论 0原文

我们打开一个由另一个进程创建的增强共享内存，如下所示

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

内存的进程是 root 用户，那么读取它的进程（如果是普通用户）将失败，原因如下：

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

但是，如果创建共享我该怎么做才能避免这种情况？也就是给所有人共享内存的权限？

原文

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");

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

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

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北笙凉宸 2025-01-01 04:09:40

如果您查看 shared_memory 构造函数，它需要一个权限对象。 boost::interprocess::permissions::set_unrestricted 可能是您正在寻找的

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

根据这个，是1.45版本添加的

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.

According to this, it was added in 1.45 version

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北渚 2025-01-01 04:09:40

下面是一个示例代码片段，用于在创建期间授予对共享内存的不受限制的权限

boost::interprocess::permissions  unrestricted_permissions;
unrestricted_permissions.set_unrestricted();

shared_mem = new managed_shared_memory(open_or_create, name.c_str(), size, 0, unrestricted_permissions);

Below is a sample code snippet, to grant unrestricted permission to shared memory during creation

boost::interprocess::permissions  unrestricted_permissions;
unrestricted_permissions.set_unrestricted();

shared_mem = new managed_shared_memory(open_or_create, name.c_str(), size, 0, unrestricted_permissions);

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