On Jan 8 17:30, Corinna Vinschen wrote: > On Jan 8 17:12, Houder wrote: > > On 2016-01-08 16:19, Corinna Vinschen wrote: > > >On Jan 4 10:24, Houder wrote: > > >>On 2016-01-04 09:52, Marco Atzeri wrote: > > >>>On 04/01/2016 09:03, Houder wrote: > > >>>>Hi Corinna, > > >>>> > > >>>>I have been looking for an STC to show why cmp fails on Cygwin (and to > > >>>>show the > > >>>>difference between Cygwin and Linux). > > >>>> > > >>>>The STC below creates a pipe (pipe() is used), followed by calls to > > >>>>fstat() and > > >>>>stat() for both the read end and the write end of the pipe. > > >>>> > > >>>>(I also tested with popen()/pclose(): same result) > > >>>> > > >>>>Regards, > > >>>>Henri > > > > > >Thanks for the STC. However, given how this stuff works internally, > > >I have no good solution off the top of my head. I played with various > > >ideas but to no avail. I add this to my TODO list, but I probably > > >won't have a quick solution :( > > > > > > > > >Thanks, > > >Corinna > > > > > > > > >P.S: It would be really helpful if you could stick to the original > > > thread and simply use "reply-to" once a discussion has started. > > > It's very confusing having to connect the various threads. Thanks. > > > > Perhaps David B. can be helped by a Cygwin-specific patching to "cmp"? Eric? > > > > ... replacing the call to fstat() by a call to stat() ... > > (as shown in https://cygwin.com/ml/cygwin/2015-12/msg00348.html) > > > > By the way, thank you for reporting back to "us" about this. I already > > feared that a "general" solution would have to wait ... You have already > > too much on your plate. > > > > As a final point, I also tested FIFOs and (unix domain) sockets. > > > > FIFOs pass the test, sockets do not. > > Yes, that's expected. The underlying hack^Wmethod is the same for sockets > and pipes, while FIFOs have a real path on a real filesystem and thus have > a real inode number to fetch in stat/fstat.
I applied a patch to make this work. Please give the latest developer snapshot from https://cygwin.com/snapshots/ a try. Thanks, Corinna -- Corinna Vinschen Please, send mails regarding Cygwin to Cygwin Maintainer cygwin AT cygwin DOT com Red Hat
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