Using read() directly into a C++ std:vector

I'm wrapping up user space linux socket functionality in some C++ for an embedded system (yes, this is probably reinventing the wheel again).

I want to offer a read and write implementation using a vector.

Doing the write is pretty easy, I can just pass &myvec[0] and avoid unnecessary copying. I'd like to do the same and read directly into a vector, rather than reading into a char buffer then copying all that into a newly created vector.

Now, I know how much data I want to read, and I can allocate appropriately (vec.reserve()). I can also read into &myvec[0], though this is probably a VERY BAD IDEA. Obviously doing this doesn't allow myvec.size to return anything sensible. Is there any way of doing this that:

1. Doesn't completely feel yucky from a safety/C++ perspective
2. Doesn't involve two copies of the data block - once from kernel to user space and once from a C char * style buffer into a C++ vector.