bug#1620: Carbon: hang when edit file on network

[David Reitter <david.reitter@gmail.com>]

This is a hang when doing file-buffer on a SMB volume (i.e. a local  
save, NOT with Tramp).  This seems to occur with another (Carbon?)  
Emacs as well, so I'm forwarding it on.

I don't have a SMB volume handy to try this out myself - the last time  
I used SMB volumes, I had no such problems.

Begin forwarded message:

> From: "Paul Falstad" <paul@falstad.com>
> Date: 17 December 2008 23:23:41 EST
> To: "David Reitter" <david.reitter@gmail.com>
> Cc: "aquamacs-bugs@aquamacs.org Bugs" <aquamacs-bugs@aquamacs.org>
> Subject: Re: [Aquamacs-bugs] hang when edit file on network
>
> According to dtruss, it seems to be doing a lot of this.
>
> readlink("/Volumes/pf/website/applets/circuit/.#DiodeElm.java\0",
> 0x16A40C10, 0x64)
>         = -1 Err#2
> readlink("/Volumes/pf/website/applets/circuit/.#DiodeElm.java\0",
> 0x16A40C10, 0x64)
>         = -1 Err#2
> symlink("pf@Macbook.local.4568\0",
> "/Volumes/pf/website/applets/circuit/.#DiodeElm.java\0")
>              = -1 Err#17
> symlink("pf@Macbook.local.4568\0",
> "/Volumes/pf/website/applets/circuit/.#DiodeElm.java\0")
>              = -1 Err#17
> readlink("/Volumes/pf/website/applets/circuit/.#DiodeElm.java\0",
> 0x16A40C10, 0x64)
>         = -1 Err#2
> symlink("pf@Macbook.local.4568\0",
> "/Volumes/pf/website/applets/circuit/.#DiodeElm.java\0")
>              = -1 Err#17
> readlink("/Volumes/pf/website/applets/circuit/.#DiodeElm.java\0",
> 0x16A40C10, 0x64)
>         = -1 Err#2
> symlink("pf@Macbook.local.4568\0",
> "/Volumes/pf/website/applets/circuit/.#DiodeElm.java\0")
>              = -1 Err#17
> readlink("/Volumes/pf/website/applets/circuit/.#DiodeElm.java\0",
> 0x16A40C10, 0x64)
>         = -1 Err#2
> symlink("pf@Macbook.local.4568\0",
> "/Volumes/pf/website/applets/circuit/.#DiodeElm.java\0")
>              = -1 Err#17
> readlink("/Volumes/pf/website/applets/circuit/.#DiodeElm.java\0",
> 0x16A40C10, 0x64)
>         = -1 Err#2
> symlink("pf@Macbook.local.4568\0",
> "/Volumes/pf/website/applets/circuit/.#DiodeElm.java\0")
>              = -1 Err#17
>
> I tried another mac emacs and it does the same thing.  I could use a
> workaround even if this isn't a bug in emacs.
>
> On Wed, Dec 17, 2008 at 10:06 PM, David Reitter <david.reitter@gmail.com 
> > wrote:
>> Can anyone here reproduce and narrow down (C-g with debug-on-quit,  
>> and/or
>> tramp verbosity set to high)?
>>
>> - David
>>
>> On 17 Dec 2008, at 22:36, Paul Falstad wrote:
>>
>>> Whenever I try to save a file stored on another machine, aquamacs
>>> hangs.  When I use a terminal window to ls the directory, aquamacs
>>> goes ahead and saves the file.
>>>
>>> GNU Emacs 22.2.50.2 (i386-apple-darwin9.2.2, Carbon Version 1.6.0)
>>> of 2008-06-17 on plume.sr.unh.edu - Aquamacs Distribution 1.4
>>>
>>> (I tried 1.5 and it has the same problem)
>>>
>>> the file is on this filesystem:
>>>
>>> Filesystem                  512-blocks      Used Available Capacity
>>> Mounted on
>>> //pf@Mac._smb._tcp.local/pf  312319584 201917784 110401800    65%
>>> /Volumes/pf
>>>
>>> to reproduce:
>>>
>>> 1. open file on network fs
>>> 2. make a change
>>> 3. try to save-file
>>> 4. aquamacs hangs
>>> 5. go into terminal window, ls directory that file is in
>>> 6. aquamacs saves file
>>
>>