On Thu, Aug 15, 2019 at 05:15:57PM +0200, Michal Privoznik wrote:
Hold on to your hat, this is going to be a wild ride. As nearly nothing in glic, nor open() is a real function. Just look into
s/glic/glibc/
bits/fcntl2.h and you'll see that open() is actually a thin wrapper that calls either __open_alias() or __open_2(). Now, before 801ebb5edb6 the open() done in virPCIDeviceConfigOpenInternal() had a constant oflags (we were opening the pci config with O_RDWR). And since we were not passing any mode nor O_CREAT the wrapper decided to call __open_alias() which was open() provided by our mock. So far so good. But after the referenced commit, the oflags is no longer compile time constant and therefore the wrapper calls __open_2() which we don't mock and thus the real __open_2() from glibc was called and thus we did try to open real path from host's /sys. This of course fails with variety of errors. Signed-off-by: Michal Privoznik <mprivozn@xxxxxxxxxx> --- tests/virpcimock.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+)
Thanks for tracking this down! Reviewed-by: Ján Tomko <jtomko@xxxxxxxxxx> Jano
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