Re: [PATCH v3] net/slirp: libslirp 4.8.0 compatibility

[Thomas Huth <thuth@redhat.com>]

On 30/01/2025 12.48, Michael Tokarev wrote:
> Update the code in net/slirp.c to be compatible with
> libslirp 4.8.0, which deprecated slirp_pollfds_fill()
> and started using slirp_os_socket type for sockets
> (which is a 64-bit integer on win64) for all callbacks
> starting with version 6 of the interface.
> 
> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
> ---
> v2: update other callbacks too, use version 6 of the interface
> v3: commit the changes before sending (*_sock => *_socket)
> 
>   net/slirp.c | 25 +++++++++++++++++--------
>   1 file changed, 17 insertions(+), 8 deletions(-)
> 
> diff --git a/net/slirp.c b/net/slirp.c
> index eb9a456ed4..2d2a58a6ee 100644
> --- a/net/slirp.c
> +++ b/net/slirp.c
> @@ -247,7 +247,14 @@ static void net_slirp_timer_mod(void *timer, int64_t expire_timer,
>       timer_mod(&t->timer, expire_timer);
>   }
>   
> -static void net_slirp_register_poll_fd(int fd, void *opaque)
> +#if !SLIRP_CHECK_VERSION(4,8,0)
> +# define slirp_os_socket int
> +# define slirp_pollfds_fill_socket slirp_pollfds_fill
> +# define register_poll_socket register_poll_fd

If I get that right, register_poll_socket has just been added to libslirp 
4.9.0, but is not available with 4.8.0 yet? ... so you might need to split 
the #if into two parts, one for 4.8.0 and one for 4.9.0 ?

  Thomas


> +# define unregister_poll_socket unregister_poll_fd
> +#endif
> +
> +static void net_slirp_register_poll_sock(slirp_os_socket fd, void *opaque)
>   {
>   #ifdef WIN32
>       AioContext *ctxt = qemu_get_aio_context();
> @@ -260,7 +267,7 @@ static void net_slirp_register_poll_fd(int fd, void *opaque)
>   #endif
>   }
>   
> -static void net_slirp_unregister_poll_fd(int fd, void *opaque)
> +static void net_slirp_unregister_poll_sock(slirp_os_socket fd, void *opaque)
>   {
>   #ifdef WIN32
>       if (WSAEventSelect(fd, NULL, 0) != 0) {
> @@ -286,8 +293,8 @@ static const SlirpCb slirp_cb = {
>   #endif
>       .timer_free = net_slirp_timer_free,
>       .timer_mod = net_slirp_timer_mod,
> -    .register_poll_fd = net_slirp_register_poll_fd,
> -    .unregister_poll_fd = net_slirp_unregister_poll_fd,
> +    .register_poll_socket = net_slirp_register_poll_sock,
> +    .unregister_poll_socket = net_slirp_unregister_poll_sock,
>       .notify = net_slirp_notify,
>   };
>   
> @@ -314,7 +321,7 @@ static int slirp_poll_to_gio(int events)
>       return ret;
>   }
>   
> -static int net_slirp_add_poll(int fd, int events, void *opaque)
> +static int net_slirp_add_poll(slirp_os_socket fd, int events, void *opaque)
>   {
>       GArray *pollfds = opaque;
>       GPollFD pfd = {
> @@ -363,8 +370,8 @@ static void net_slirp_poll_notify(Notifier *notifier, void *data)
>   
>       switch (poll->state) {
>       case MAIN_LOOP_POLL_FILL:
> -        slirp_pollfds_fill(s->slirp, &poll->timeout,
> -                           net_slirp_add_poll, poll->pollfds);
> +        slirp_pollfds_fill_socket(s->slirp, &poll->timeout,
> +                                  net_slirp_add_poll, poll->pollfds);
>           break;
>       case MAIN_LOOP_POLL_OK:
>       case MAIN_LOOP_POLL_ERR:
> @@ -629,7 +636,9 @@ static int net_slirp_init(NetClientState *peer, const char *model,
>   
>       s = DO_UPCAST(SlirpState, nc, nc);
>   
> -    cfg.version = SLIRP_CHECK_VERSION(4,7,0) ? 4 : 1;
> +    cfg.version =
> +         SLIRP_CHECK_VERSION(4,8,0) ? 6 :
> +         SLIRP_CHECK_VERSION(4,7,0) ? 4 : 1;
>       cfg.restricted = restricted;
>       cfg.in_enabled = ipv4;
>       cfg.vnetwork = net;