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

[Tetsurou Okazaki]

At Wed, 24 Feb 2010 20:30:13 +0200,
Eli Zaretskii wrote:
> 
> > Date: Wed, 24 Feb 2010 18:05:11 +0900
> > From: Tetsurou Okazaki <okazaki@be.to>
> > Cc: 
> > 
> >   Emacs in trunk built with Cygwin environment hangs
> >   when you try to complete path name after double slashes.
> > 
> >   M-x find-file
> >   (In the minibuffer) //[TAB]
> 
> Could it be that it just waits for the network?  If you leave it alone
> for a few minutes, does it come back to life?

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 // is the beginning of the UNC, so Emacs could be trying to access
> the network.  If that's true, it will time-out after a few minutes.



--
Tetsurou