bug#5637: 23.1.92; Cygwin Emacs hangs after completion of //

[Eli Zaretskii]

> Date: Tue, 09 Mar 2010 06:06:35 +0900
> From: Tetsurou Okazaki <okazaki@be.to>
> Cc: Tetsurou Okazaki <okazaki@be.to>, 5637@debbugs.gnu.org
> 
> No.  Sending QUIT signal from outside the process returns control to Emacs.
> Tracing with gdb revealed that Emacs blocks in the function 
> `file_name_completion_stat'
> at `stat' call with the argument fullname = "//bin" after the previous 
> `lstat' call
> with same arguments returns -1 with errno = EINTR.

The errno = EINTR looks strange -- unless you also interrupted it
under GDB.

Could this be a Cygwin issue?  Would it be a good idea to ask on the
Cygwin list about calling `stat' with an argument that begins with two
slashes?