Mail Archives: cygwin/2005/10/19/13:11:45
On Oct 19 14:23, Eric Blake wrote:
> Angelo Graziosi <Angelo.Graziosi <at> roma1.infn.it> writes:
>
> > 1)
> > Using coreutils-5.90-3 I have observed that the command 'cp -p' does not
> > preserve the timestamp of a file:
> >
> > $ ls -lrt
> > -rw-r--r-- 1 Administrator Administrators 418 Aug 7 18:55 t.c
> >
> > $ cp -p t.c t.cpp
> > $ ls -lrt
> > -rw-r--r-- 1 Administrator Administrators 418 Aug 7 18:55 t.c
> > -rw-r--r-- 1 Administrator Administrators 418 Oct 18 19:05 t.cpp
> >
> > Reinstalling coreutilis-5.3.0-9 the files have the same timestamps.
>
> As far as I can tell, this is a bug in cygwin.
>
> 5.3.0 made the following sequence of calls:
> dest_desc = open(dest,...);
> write(dest_desc,...);
> close(dest_desc);
> utimes(dest,...);
> chmod(dest,...);
>
> 5.90 makes the following sequence of calls:
> dest_desc = open(dest,...);
> write(dest_desc,...);
> utimes(dest,...); // at this point, timestamp is correct
> fchmod(dest_desc,...);
> close(dest_desc); // oops, timestamp changed
Apparently NT overwrites the mtime timestamp on close, as long as write
buffers are not written to disk at that time. Chris had an idea how to
work around that in Cygwin so that it should work in most cases now.
Please try the latest snapshot from http://cygwin.com/snapshots/
Corinna
--
Corinna Vinschen Please, send mails regarding Cygwin to
Cygwin Project Co-Leader cygwin AT cygwin DOT com
Red Hat, Inc.
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