Add unit tests for the new qio_channel_pread{v,}_all{,_eof}() and
qio_channel_pwrite{v,}_all() APIs.
The basic tests write data to a file channel, then read it back at
various offsets using both the single-buffer and iovec variants to
make sure the round-trip produces identical content. The _eof tests
verify all three return cases -- full read (1), clean EOF (0), and
partial-then-EOF (-1 with error set) -- and check that the strict
wrappers (preadv_all / pread_all) treat a clean EOF as an error.
All tests are guarded by CONFIG_PREADV since the underlying channel
methods require preadv(2).
Signed-off-by: Junjie Cao <junjie.cao@intel.com>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Acked-by: Daniel P. Berrangé <berrange@redhat.com>
Link: https://lore.kernel.org/qemu-devel/20260413214549.926435-5-junjie.cao@intel.com
Signed-off-by: Fabiano Rosas <farosas@suse.de>
6a9a6f5aa8