16b38080e3
Technically, fcntl(soc, F_SETFL, O_NONBLOCK) is incorrect since it clobbers all other file flags. We can use F_GETFL to get the current flags, set or clear the O_NONBLOCK flag, then use F_SETFL to set the flags. Using the qemu_set_nonblock() wrapper. Signed-off-by: Gonglei <arei.gonglei@huawei.com> Signed-off-by: Wangxin <wangxinxin.wang@huawei.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>