At the moment, close is retried on EINTR.

On many operating systems, you shouldn't do this. e.g. From linux man page:

In particular close() should not be retried after an EINTR since this may cause a reused descriptor from another thread to be closed.

If my earlier research is correct:

• HP-UX you try again
• Linux, Solaris and AIX you don't want to retry again
• OSX is ill-defined and hence unsafe, you should use close_nocancel instead and not try again.

Related links:

• http://austingroupbugs.net/view.php?id=529
• http://alobbs.com/post/54503240599/close-and-eintr
• http://www.daemonology.net/blog/2011-12-17-POSIX-close-is-broken.html
• https://code.google.com/p/chromium/issues/detail?id=269623
• Handle EINTR when closing sockets wahern/cqueues#56