"rsync -e ssh" hangs when lots of data is being transferred -- USE_PIPES in OpenSSH is the culprit

[Jonathan Kamens]

Perhaps if the pipe vs. socketpair thing causes problems on any other
operating systems besides Cygwin, the OpenSSH maintainers might
consider making the decision of whether to use pipes of socketpairs a
configuration option instead of a compile-time option?  Then, people
who encounter problems on Cygwin could simply flip the option.

  jik