Marc-André Lureau <marcandre.lur...@gmail.com> 于2018年11月21日周三 下午7:28写道：
> Hi
>
> On Wed, Nov 21, 2018 at 3:22 PM Li Qiang <liq...@gmail.com> wrote:
> >
> > The fcntl will change the flags directly, use qemu_set_nonblock()
> > instead.
>
> qemu_set_nonblock() will preserve the existing flags. And on windows,
> it will register the FD to the event loop.
>
Oh, I don't consider the windows behavior. I'm not sure is this the
expected behavior.
> that's a reasonable thing to do, is this fixing an actual bug?
>
No, I just think there is no reason to change other flags in linux.
Thanks,
Li Qiang
>
> >
> > Signed-off-by: Li Qiang <liq...@gmail.com>
> > ---
> > net/tap.c | 10 +++++-----
> > 1 file changed, 5 insertions(+), 5 deletions(-)
> >
> > diff --git a/net/tap.c b/net/tap.c
> > index cc8525f154..e8aadd8d4b 100644
> > --- a/net/tap.c
> > +++ b/net/tap.c
> > @@ -592,7 +592,7 @@ int net_init_bridge(const Netdev *netdev, const char
> *name,
> > return -1;
> > }
> >
> > - fcntl(fd, F_SETFL, O_NONBLOCK);
> > + qemu_set_nonblock(fd);
> > vnet_hdr = tap_probe_vnet_hdr(fd);
> > s = net_tap_fd_init(peer, "bridge", name, fd, vnet_hdr);
> >
> > @@ -707,7 +707,7 @@ static void net_init_tap_one(const NetdevTapOptions
> *tap, NetClientState *peer,
> > }
> > return;
> > }
> > - fcntl(vhostfd, F_SETFL, O_NONBLOCK);
> > + qemu_set_nonblock(vhostfd);
> > }
> > options.opaque = (void *)(uintptr_t)vhostfd;
> >
> > @@ -791,7 +791,7 @@ int net_init_tap(const Netdev *netdev, const char
> *name,
> > return -1;
> > }
> >
> > - fcntl(fd, F_SETFL, O_NONBLOCK);
> > + qemu_set_nonblock(fd);
> >
> > vnet_hdr = tap_probe_vnet_hdr(fd);
> >
> > @@ -839,7 +839,7 @@ int net_init_tap(const Netdev *netdev, const char
> *name,
> > goto free_fail;
> > }
> >
> > - fcntl(fd, F_SETFL, O_NONBLOCK);
> > + qemu_set_nonblock(fd);
> >
> > if (i == 0) {
> > vnet_hdr = tap_probe_vnet_hdr(fd);
> > @@ -887,7 +887,7 @@ free_fail:
> > return -1;
> > }
> >
> > - fcntl(fd, F_SETFL, O_NONBLOCK);
> > + qemu_set_nonblock(fd);
> > vnet_hdr = tap_probe_vnet_hdr(fd);
> >
> > net_init_tap_one(tap, peer, "bridge", name, ifname,
> > --
> > 2.11.0
> >
> >
>
>
> --
> Marc-André Lureau
>
