Problem with fcnlt F_GETLK command
Corinna Vinschen
corinna-cygwin@cygwin.com
Wed Nov 18 20:45:00 GMT 2009
On Nov 18 08:08, jmsplat101-cygwin@yahoo.co.uk wrote:
> Hello,
>
> I've down loaded version 1.7 onto my Windows XP laptop (uname -a
> reports CYGWIN_NT-5.1 XXXXXXXXXX 1.7.0(0.217/5/3) 2009-11-10 13:03
> i686 Cygwin) and I'm having some problems with the fcntl() function.
>
> I've written the following sample to demonstrate the problem:
> [SNIP]
> If I run this code in the same directory in two seperate shells I'd
> expect only the first instance to print 'No blocking lock'Â
> however both do and the second then goes on to block waiting for the
> actual lock (which it gets when I terminate the first instance). So
> the locking functionality works just fine; however the lock reporting
> does seem not to work and always returns F_UNLCK.
>
> Can someone confirm if this is a known limittaion of the current
> version, a limitation of the underlying windows API or a bug?
It's a bug. The original BSD code which the Cygwin code is based on
took a shortcut in a specific case, which is invalid for Cygwin.
I disabled this shaortcut and your testcase runs fine now. I'll
prepare a new 1.7.0 testrelease in the next few days.
Thanks for the report and espcially thanks for the simple testcase.
Corinna
--
Corinna Vinschen Please, send mails regarding Cygwin to
Cygwin Project Co-Leader cygwin AT cygwin DOT com
Red Hat
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