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?
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