* Daniel P. Berrangé:
I'm not familiar with what COPR is doing for s39x0 ? Is it using
the
simple QEMU linux-user syscall emulation, or is it running a proper
QEMU s390x VM.
I'm guessing probably the former. The linux-user syscall emulation is
truely amazing, but it is certainly not feature complete or fully
robust.
It still implements vfork using fork, right? This means we should
likely fix posix_spawn in glibc to support this deviation from the
kernel interface. Other Linux emulations have exactly the same problem.
For emulating 32-bit targets, we have a broken readdir/telldir/seekdir
implementation in glibc on 64 bit host kernels because we try to use
d_ino directly, which is 64 bit and does not fit into the long value
that POSIX requires. A kernel patch with a new interface has been
posted which would work around this has been proposed, but it is not
going anywhere.
The second issue also affects full-system virtualization if p9fs (not
sure what the right name is, it's the older pass-through file system) is
used. But it's specific to 32 bit, so maybe not that important after
all.
Thanks,
Florian