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. Corinna -- Corinna Vinschen Please, send mails regarding Cygwin to Cygwin Maintainer cygwin AT cygwin DOT com Red Hat
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