Re: Cannot run Qt5 applications.

[Yaakov Selkowitz <yselkowitz@cygwin.com>]

On Fri, 2015-02-13 at 18:32 +0000, Jon TURNEY wrote:
> On 05/02/2015 01:40, Jon TURNEY wrote:
> > On 04/02/2015 23:20, David Stacey wrote:
> >> I'm having difficulty running any Qt5 application. These are the
> >> commands I'm issuing:
> >> [snip]
> >> and I see the clock, so X is up and running. Then:
> >> [snip]
> >
> > Possibly you need to install and start cygserver (See [1])
> >
> > If so, this is because Qt5 is assuming shared memory is available, which
> > could possibly be handled in a better way...
> 
> This looks like a portability problem in Qt5, where it only handles 
> shmget() failing with a return value of -1, not with SIGSYS, to fallback 
> to using an image in unshared memory.
> 
> Patch attached.

Or is it a problem with our shmget()?

http://pubs.opengroup.org/onlinepubs/9699919799/functions/shmget.html
http://man7.org/linux/man-pages/man2/shmget.2.html

Perhaps we should be just returning -1 with an errno (ENOSYS?) instead
of raise(SIGSYS)?

--
Yaakov



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