net/slirp: libslirp 4.9.0 compatibility

Update the code in net/slirp.c to be compatible with
libslirp 4.9.0, 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>
Reviewed-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Message-ID: <20250130123253.864681-1-mjt@tls.msk.ru>
[thuth: Added some spaces to make checkpatch.pl happy]
Signed-off-by: Thomas Huth <thuth@redhat.com>

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, 9, 0)
+# define slirp_os_socket int
+# define slirp_pollfds_fill_socket slirp_pollfds_fill
+# define register_poll_socket register_poll_fd
+# 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, 9, 0) ? 6 :
+         SLIRP_CHECK_VERSION(4, 7, 0) ? 4 : 1;
     cfg.restricted = restricted;
     cfg.in_enabled = ipv4;
     cfg.vnetwork = net;