(call-process ...) hangs in emacs

[Peter Hull]

VC integration in emacs has stopped working for me in the past few
days. Using emacs debugger I found the last function call was to
call-process which never returns.

I can reproduce this by evaluating in Lisp Interaction mode (using ^J)
(call-process "pwd" nil t)
I would expect to see the PWD and exit code but instead it just hangs
until I Quit it (^G)

I am using GNU Emacs 24.3.1 and confirmed cygwin and all packages up
to date. (cygwin DLL 1.7.31)

Thanks.
Peter

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