Setting permission for shared memory created by boost

c++ permissions boost-interprocess
Prasanth Madhavan picture Prasanth Madhavan · Jan 6, 2012 · Viewed 7.7k times · Source

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?

Answer

parapura rajkumar picture parapura rajkumar · Jan 6, 2012

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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