It was a Yocto 2.0 sysroot running on an Ubuntu 16.04 host.
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QEMU fails to honor O_TMPFILE
Status in QEMU:
When making a call like
open("/tmp", O_TMPFILE | O_RDWR);
under QEMU, we ged -EISDIR.
Under any kernel 3.11 or later, we are supposed to get an unnamed file
in /tmp. In case the filesystem for /tmp does not support unnamed
files, we are supposed to get EOPNOTSUPP.
[I don't know the QEMU version, since this happened in a system I
don't have access to]
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