I have found that the file_descriptor class in Boost.Iostreams does not retry on EINTR.  The relevant code is in libs/iostreams/src/file_descriptor.cpp.

A bug was raised for this 7 years ago: https://svn.boost.org/trac10/ticket/4913

There is a patch attached to that bug that makes the file_descriptor_impl::read method retry on EINTR.  If something like this were implemented then something similar should also be done to retry in the file_descriptor_impl::write method.

I could have a go at submitting a PR to make both the read and write methods retry if interrupted.  But before I do this, is there any other history I should be aware of, like a good reason why EINTR is not currently handled?

Many thanks,

David