chardev: .chr_open(): drop be_opened parameter

The logic around the parameter is rather tricky. Let's instead
explicitly send CHR_EVENT_OPENED in all backends where needed.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
[ Marc-André - add CHR_EVENT_OPENED in udp_chr_open() ]
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20260115144606.233252-6-vsementsov@yandex-team.ru>

chardev/baum.c

@@ -642,10 +642,7 @@ static void char_braille_finalize(Object *obj)
     }
 }
 
-static void baum_chr_open(Chardev *chr,
-                          ChardevBackend *backend,
-                          bool *be_opened,
-                          Error **errp)
+static void baum_chr_open(Chardev *chr, ChardevBackend *backend, Error **errp)
 {
     BaumChardev *baum = BAUM_CHARDEV(chr);
     brlapi_handle_t *handle;
@@ -670,6 +667,8 @@ static void baum_chr_open(Chardev *chr,
      * as an integer, but in practice it seems to work
      */
     qemu_set_fd_handler(baum->brlapi_fd, baum_chr_read, NULL, baum);
+
+    qemu_chr_be_event(chr, CHR_EVENT_OPENED);
 }
 
 static void char_braille_class_init(ObjectClass *oc, const void *data)

chardev/char-console.c

@@ -26,12 +26,11 @@
 #include "chardev/char-win.h"
 #include "qemu/module.h"
 
-static void console_chr_open(Chardev *chr,
-                             ChardevBackend *backend,
-                             bool *be_opened,
+static void console_chr_open(Chardev *chr, ChardevBackend *backend,
                              Error **errp)
 {
     win_chr_set_file(chr, GetStdHandle(STD_OUTPUT_HANDLE), true);
+    qemu_chr_be_event(chr, CHR_EVENT_OPENED);
 }
 
 static void char_console_class_init(ObjectClass *oc, const void *data)

chardev/char-file.c

@@ -34,10 +34,7 @@
 #include "chardev/char-fd.h"
 #endif
 
-static void file_chr_open(Chardev *chr,
-                          ChardevBackend *backend,
-                          bool *be_opened,
-                          Error **errp)
+static void file_chr_open(Chardev *chr, ChardevBackend *backend, Error **errp)
 {
     ChardevFile *file = backend->u.file.data;
 #ifdef _WIN32
@@ -100,6 +97,8 @@ static void file_chr_open(Chardev *chr,
         return;
     }
 #endif
+
+    qemu_chr_be_event(chr, CHR_EVENT_OPENED);
 }
 
 static void file_chr_parse(QemuOpts *opts, ChardevBackend *backend,

chardev/char-hub.c

@@ -203,10 +203,7 @@ static void hub_chr_update_read_handlers(Chardev *chr)
     }
 }
 
-static void hub_chr_open(Chardev *chr,
-                         ChardevBackend *backend,
-                         bool *be_opened,
-                         Error **errp)
+static void hub_chr_open(Chardev *chr, ChardevBackend *backend, Error **errp)
 {
     ChardevHub *hub = backend->u.hub.data;
     HubChardev *d = HUB_CHARDEV(chr);
@@ -241,8 +238,10 @@ static void hub_chr_open(Chardev *chr,
         list = list->next;
     }
 
-    /* Closed until an explicit event from backend */
-    *be_opened = false;
+    /*
+     * Closed until an explicit event from backend, so we don't
+     * send CHR_EVENT_OPENED now.
+     */
 }
 
 static void hub_chr_parse(QemuOpts *opts, ChardevBackend *backend, Error **errp)

chardev/char-mux.c

@@ -361,10 +361,7 @@ void mux_set_focus(Chardev *chr, unsigned int focus)
     mux_chr_send_event(d, d->focus, CHR_EVENT_MUX_IN);
 }
 
-static void mux_chr_open(Chardev *chr,
-                         ChardevBackend *backend,
-                         bool *be_opened,
-                         Error **errp)
+static void mux_chr_open(Chardev *chr, ChardevBackend *backend, Error **errp)
 {
     ChardevMux *mux = backend->u.mux.data;
     Chardev *drv;
@@ -377,11 +374,17 @@ static void mux_chr_open(Chardev *chr,
     }
 
     d->focus = -1;
-    /* only default to opened state if we've realized the initial
-     * set of muxes
+    if (!qemu_chr_fe_init(&d->chr, drv, errp)) {
+        return;
+    }
+
+    /*
+     * Only move to opened state if we've realized
+     * the initial set of muxes:
      */
-    *be_opened = muxes_opened;
-    qemu_chr_fe_init(&d->chr, drv, errp);
+    if (muxes_opened) {
+        qemu_chr_be_event(chr, CHR_EVENT_OPENED);
+    }
 }
 
 static void mux_chr_parse(QemuOpts *opts, ChardevBackend *backend, Error **errp)

chardev/char-null.c

@@ -26,12 +26,9 @@
 #include "chardev/char.h"
 #include "qemu/module.h"
 
-static void null_chr_open(Chardev *chr,
-                          ChardevBackend *backend,
-                          bool *be_opened,
-                          Error **errp)
+static void null_chr_open(Chardev *chr, ChardevBackend *backend, Error **errp)
 {
-    *be_opened = false;
+    /* do not send CHR_EVENT_OPENED */
 }
 
 static void char_null_class_init(ObjectClass *oc, const void *data)

chardev/char-parallel.c

@@ -157,10 +157,7 @@ static int parallel_chr_ioctl(Chardev *chr, int cmd, void *arg)
     return 0;
 }
 
-static void parallel_chr_open_fd(Chardev *chr,
-                                int fd,
-                                bool *be_opened,
-                                Error **errp)
+static void parallel_chr_open_fd(Chardev *chr, int fd, Error **errp)
 {
     ParallelChardev *drv = PARALLEL_CHARDEV(chr);
 
@@ -172,6 +169,7 @@ static void parallel_chr_open_fd(Chardev *chr,
     }
 
     drv->mode = IEEE1284_MODE_COMPAT;
+    qemu_chr_be_event(chr, CHR_EVENT_OPENED);
 }
 #endif /* __linux__ */
 
@@ -227,21 +225,16 @@ static int parallel_chr_ioctl(Chardev *chr, int cmd, void *arg)
     return 0;
 }
 
-static void parallel_chr_open_fd(Chardev *chr,
-                                int fd,
-                                bool *be_opened,
-                                Error **errp)
+static void parallel_chr_open_fd(Chardev *chr, int fd, Error **errp)
 {
     ParallelChardev *drv = PARALLEL_CHARDEV(chr);
     drv->fd = fd;
-    *be_opened = false;
 }
 #endif
 
 #ifdef HAVE_CHARDEV_PARALLEL
 static void parallel_chr_open(Chardev *chr,
                               ChardevBackend *backend,
-                              bool *be_opened,
                               Error **errp)
 {
     ChardevHostdev *parallel = backend->u.parallel.data;
@@ -251,7 +244,7 @@ static void parallel_chr_open(Chardev *chr,
     if (fd < 0) {
         return;
     }
-    parallel_chr_open_fd(chr, fd, be_opened, errp);
+    parallel_chr_open_fd(chr, fd, errp);
 }
 
 static void parallel_chr_parse(QemuOpts *opts, ChardevBackend *backend,

chardev/char-pipe.c

@@ -103,10 +103,7 @@ static int win_chr_pipe_init(Chardev *chr, const char *filename,
     return -1;
 }
 
-static void pipe_chr_open(Chardev *chr,
-                          ChardevBackend *backend,
-                          bool *be_opened,
-                          Error **errp)
+static void pipe_chr_open(Chardev *chr, ChardevBackend *backend, Error **errp)
 {
     ChardevHostdev *opts = backend->u.pipe.data;
     const char *filename = opts->device;
@@ -114,14 +111,13 @@ static void pipe_chr_open(Chardev *chr,
     if (win_chr_pipe_init(chr, filename, errp) < 0) {
         return;
     }
+
+    qemu_chr_be_event(chr, CHR_EVENT_OPENED);
 }
 
 #else
 
-static void pipe_chr_open(Chardev *chr,
-                          ChardevBackend *backend,
-                          bool *be_opened,
-                          Error **errp)
+static void pipe_chr_open(Chardev *chr, ChardevBackend *backend, Error **errp)
 {
     ChardevHostdev *opts = backend->u.pipe.data;
     int fd_in, fd_out;
@@ -158,6 +154,8 @@ static void pipe_chr_open(Chardev *chr,
         }
         return;
     }
+
+    qemu_chr_be_event(chr, CHR_EVENT_OPENED);
 }
 
 #endif /* !_WIN32 */

chardev/char-pty.c

@@ -331,10 +331,7 @@ static int qemu_openpty_raw(int *aslave, char *pty_name)
     return amaster;
 }
 
-static void pty_chr_open(Chardev *chr,
-                         ChardevBackend *backend,
-                         bool *be_opened,
-                         Error **errp)
+static void pty_chr_open(Chardev *chr, ChardevBackend *backend, Error **errp)
 {
     PtyChardev *s;
     int master_fd, slave_fd;
@@ -364,7 +361,6 @@ static void pty_chr_open(Chardev *chr,
     qio_channel_set_name(s->ioc, name);
     g_free(name);
     s->timer_src = NULL;
-    *be_opened = false;
 
     /* create symbolic link */
     if (path) {

chardev/char-ringbuf.c

@@ -94,7 +94,6 @@ static void char_ringbuf_finalize(Object *obj)
 
 static void ringbuf_chr_open(Chardev *chr,
                              ChardevBackend *backend,
-                             bool *be_opened,
                              Error **errp)
 {
     ChardevRingbuf *opts = backend->u.ringbuf.data;
@@ -111,6 +110,8 @@ static void ringbuf_chr_open(Chardev *chr,
     d->prod = 0;
     d->cons = 0;
     d->cbuf = g_malloc0(d->size);
+
+    qemu_chr_be_event(chr, CHR_EVENT_OPENED);
 }
 
 void qmp_ringbuf_write(const char *device, const char *data,

chardev/char-serial.c

@@ -41,14 +41,15 @@
 
 #ifdef _WIN32
 
-static void serial_chr_open(Chardev *chr,
-                            ChardevBackend *backend,
-                            bool *be_opened,
-                            Error **errp)
+static void serial_chr_open(Chardev *chr, ChardevBackend *backend, Error **errp)
 {
     ChardevHostdev *serial = backend->u.serial.data;
+    int ret = win_chr_serial_init(chr, serial->device, errp);
+    if (ret < 0) {
+        return;
+    }
 
-    win_chr_serial_init(chr, serial->device, errp);
+    qemu_chr_be_event(chr, CHR_EVENT_OPENED);
 }
 
 #elif defined(__linux__) || defined(__sun__) || defined(__FreeBSD__)      \
@@ -258,10 +259,7 @@ static int serial_chr_ioctl(Chardev *chr, int cmd, void *arg)
     return 0;
 }
 
-static void serial_chr_open(Chardev *chr,
-                            ChardevBackend *backend,
-                            bool *be_opened,
-                            Error **errp)
+static void serial_chr_open(Chardev *chr, ChardevBackend *backend, Error **errp)
 {
     ChardevHostdev *serial = backend->u.serial.data;
     int fd;
@@ -281,6 +279,8 @@ static void serial_chr_open(Chardev *chr,
         close(fd);
         return;
     }
+
+    qemu_chr_be_event(chr, CHR_EVENT_OPENED);
 }
 #endif /* __linux__ || __sun__ */
 

chardev/char-socket.c

@@ -1365,10 +1365,7 @@ static bool qmp_chardev_validate_socket(ChardevSocket *sock,
 }
 
 
-static void tcp_chr_open(Chardev *chr,
-                         ChardevBackend *backend,
-                         bool *be_opened,
-                         Error **errp)
+static void tcp_chr_open(Chardev *chr, ChardevBackend *backend, Error **errp)
 {
     SocketChardev *s = SOCKET_CHARDEV(chr);
     ChardevSocket *sock = backend->u.socket.data;
@@ -1439,9 +1436,6 @@ static void tcp_chr_open(Chardev *chr,
     }
     s->registered_yank = true;
 
-    /* be isn't opened until we get a connection */
-    *be_opened = false;
-
     update_disconnected_filename(s);
 
     if (s->is_listen) {
@@ -1454,6 +1448,8 @@ static void tcp_chr_open(Chardev *chr,
             return;
         }
     }
+
+    /* be isn't opened until we get a connection */
 }
 
 static void tcp_chr_parse(QemuOpts *opts, ChardevBackend *backend, Error **errp)

chardev/char-stdio.c

@@ -85,10 +85,7 @@ static void term_stdio_handler(int sig)
     stdio_chr_set_echo(NULL, stdio_echo_state);
 }
 
-static void stdio_chr_open(Chardev *chr,
-                           ChardevBackend *backend,
-                           bool *be_opened,
-                           Error **errp)
+static void stdio_chr_open(Chardev *chr, ChardevBackend *backend, Error **errp)
 {
     ChardevStdio *opts = backend->u.stdio.data;
     struct sigaction act;
@@ -123,6 +120,8 @@ static void stdio_chr_open(Chardev *chr,
 
     stdio_allow_signal = !opts->has_signal || opts->signal;
     stdio_chr_set_echo(chr, false);
+
+    qemu_chr_be_event(chr, CHR_EVENT_OPENED);
 }
 #endif
 

chardev/char-udp.c

@@ -188,10 +188,7 @@ static void udp_chr_parse(QemuOpts *opts, ChardevBackend *backend, Error **errp)
     }
 }
 
-static void upd_chr_open(Chardev *chr,
-                         ChardevBackend *backend,
-                         bool *be_opened,
-                         Error **errp)
+static void upd_chr_open(Chardev *chr, ChardevBackend *backend, Error **errp)
 {
     ChardevUdp *udp = backend->u.udp.data;
     SocketAddress *local_addr = socket_address_flatten(udp->local);
@@ -214,6 +211,7 @@ static void upd_chr_open(Chardev *chr,
     g_free(name);
 
     s->ioc = QIO_CHANNEL(sioc);
+    qemu_chr_be_event(chr, CHR_EVENT_OPENED);
 }
 
 static void char_udp_class_init(ObjectClass *oc, const void *data)

chardev/char-win-stdio.c

@@ -144,7 +144,6 @@ static void win_stiod_chr_set_echo(Chardev *chr, bool echo)
 
 static void win_stdio_chr_open(Chardev *chr,
                                ChardevBackend *backend,
-                               bool *be_opened,
                                Error **errp)
 {
     ChardevStdio *opts = backend->u.stdio.data;
@@ -208,6 +207,7 @@ static void win_stdio_chr_open(Chardev *chr,
 
     win_stiod_chr_set_echo(chr, false);
 
+    qemu_chr_be_event(chr, CHR_EVENT_OPENED);
     return;
 
 err3:

chardev/char.c

@@ -246,8 +246,7 @@ int qemu_chr_add_client(Chardev *s, int fd)
         CHARDEV_GET_CLASS(s)->chr_add_client(s, fd) : -1;
 }
 
-static void qemu_char_open(Chardev *chr, ChardevBackend *backend,
-                           bool *be_opened, Error **errp)
+static void qemu_char_open(Chardev *chr, ChardevBackend *backend, Error **errp)
 {
     ChardevClass *cc = CHARDEV_GET_CLASS(chr);
     /* Any ChardevCommon member would work */
@@ -268,7 +267,7 @@ static void qemu_char_open(Chardev *chr, ChardevBackend *backend,
     }
 
     if (cc->chr_open) {
-        cc->chr_open(chr, backend, be_opened, errp);
+        cc->chr_open(chr, backend, errp);
     }
 }
 
@@ -1009,7 +1008,6 @@ static Chardev *chardev_new(const char *id, const char *typename,
     Object *obj;
     Chardev *chr = NULL;
     Error *local_err = NULL;
-    bool be_opened = true;
 
     assert(g_str_has_prefix(typename, "chardev-"));
     assert(id);
@@ -1020,7 +1018,7 @@ static Chardev *chardev_new(const char *id, const char *typename,
     chr->label = g_strdup(id);
     chr->gcontext = gcontext;
 
-    qemu_char_open(chr, backend, &be_opened, &local_err);
+    qemu_char_open(chr, backend, &local_err);
     if (local_err) {
         error_propagate(errp, local_err);
         object_unref(obj);
@@ -1030,9 +1028,6 @@ static Chardev *chardev_new(const char *id, const char *typename,
     if (!chr->filename) {
         chr->filename = g_strdup(typename + 8);
     }
-    if (be_opened) {
-        qemu_chr_be_event(chr, CHR_EVENT_OPENED);
-    }
 
     return chr;
 }

chardev/msmouse.c

@@ -255,16 +255,16 @@ static void char_msmouse_finalize(Object *obj)
 
 static void msmouse_chr_open(Chardev *chr,
                              ChardevBackend *backend,
-                             bool *be_opened,
                              Error **errp)
 {
     MouseChardev *mouse = MOUSE_CHARDEV(chr);
 
-    *be_opened = false;
     mouse->hs = qemu_input_handler_register((DeviceState *)mouse,
                                             &msmouse_handler);
     mouse->tiocm = 0;
     fifo8_create(&mouse->outbuf, MSMOUSE_BUF_SZ);
+
+    /* Never send CHR_EVENT_OPENED */
 }
 
 static void char_msmouse_class_init(ObjectClass *oc, const void *data)

chardev/spice.c

@@ -251,9 +251,7 @@ static void chr_open(Chardev *chr, const char *subtype)
     s->sin.subtype = g_strdup(subtype);
 }
 
-static void spice_vmc_chr_open(Chardev *chr,
-                               ChardevBackend *backend,
-                               bool *be_opened,
+static void spice_vmc_chr_open(Chardev *chr, ChardevBackend *backend,
                                Error **errp)
 {
     ChardevSpiceChannel *spicevmc = backend->u.spicevmc.data;
@@ -277,13 +275,10 @@ static void spice_vmc_chr_open(Chardev *chr,
         return;
     }
 
-    *be_opened = false;
     chr_open(chr, type);
 }
 
-static void spice_port_chr_open(Chardev *chr,
-                                ChardevBackend *backend,
-                                bool *be_opened,
+static void spice_port_chr_open(Chardev *chr, ChardevBackend *backend,
                                 Error **errp)
 {
     ChardevSpicePort *spiceport = backend->u.spiceport.data;
@@ -302,7 +297,6 @@ static void spice_port_chr_open(Chardev *chr,
 
     chr_open(chr, "port");
 
-    *be_opened = false;
     s = SPICE_CHARDEV(chr);
     s->sin.portname = g_strdup(name);
 

chardev/wctablet.c

@@ -326,13 +326,10 @@ static void wctablet_chr_finalize(Object *obj)
 
 static void wctablet_chr_open(Chardev *chr,
                               ChardevBackend *backend,
-                              bool *be_opened,
                               Error **errp)
 {
     TabletChardev *tablet = WCTABLET_CHARDEV(chr);
 
-    *be_opened = true;
-
     /* init state machine */
     memcpy(tablet->outbuf, WC_FULL_CONFIG_STRING, WC_FULL_CONFIG_STRING_LENGTH);
     tablet->outlen = WC_FULL_CONFIG_STRING_LENGTH;
@@ -340,6 +337,8 @@ static void wctablet_chr_open(Chardev *chr,
 
     tablet->hs = qemu_input_handler_register((DeviceState *)tablet,
                                              &wctablet_handler);
+
+    qemu_chr_be_event(chr, CHR_EVENT_OPENED);
 }
 
 static void wctablet_chr_class_init(ObjectClass *oc, const void *data)

gdbstub/system.c

@@ -233,10 +233,9 @@ static int gdb_chr_write(Chardev *chr, const uint8_t *buf, int len)
     return len;
 }
 
-static void gdb_chr_open(Chardev *chr, ChardevBackend *backend,
-                             bool *be_opened, Error **errp)
+static void gdb_chr_open(Chardev *chr, ChardevBackend *backend, Error **errp)
 {
-    *be_opened = false;
+    /* Never send CHR_EVENT_OPENED */
 }
 
 static void char_gdb_class_init(ObjectClass *oc, const void *data)

include/chardev/char.h

@@ -260,8 +260,7 @@ struct ChardevClass {
     void (*chr_parse)(QemuOpts *opts, ChardevBackend *backend, Error **errp);
 
     /* called after construction, open/starts the backend */
-    void (*chr_open)(Chardev *chr, ChardevBackend *backend,
-                 bool *be_opened, Error **errp);
+    void (*chr_open)(Chardev *chr, ChardevBackend *backend, Error **errp);
 
     /* write buf to the backend */
     int (*chr_write)(Chardev *s, const uint8_t *buf, int len);

ui/console-vc.c

@@ -1093,10 +1093,7 @@ void qemu_text_console_update_size(QemuTextConsole *c)
     dpy_text_resize(QEMU_CONSOLE(c), c->width, c->height);
 }
 
-static void vc_chr_open(Chardev *chr,
-                        ChardevBackend *backend,
-                        bool *be_opened,
-                        Error **errp)
+static void vc_chr_open(Chardev *chr, ChardevBackend *backend, Error **errp)
 {
     ChardevVC *vc = backend->u.vc.data;
     VCChardev *drv = VC_CHARDEV(chr);
@@ -1144,7 +1141,7 @@ static void vc_chr_open(Chardev *chr,
         drv->t_attrib = TEXT_ATTRIBUTES_DEFAULT;
     }
 
-    *be_opened = true;
+    qemu_chr_be_event(chr, CHR_EVENT_OPENED);
 }
 
 static void vc_chr_parse(QemuOpts *opts, ChardevBackend *backend, Error **errp)

ui/dbus-chardev.c

@@ -176,9 +176,7 @@ dbus_chr_send_break(
     return DBUS_METHOD_INVOCATION_HANDLED;
 }
 
-static void
-dbus_chr_open(Chardev *chr, ChardevBackend *backend,
-              bool *be_opened, Error **errp)
+static void dbus_chr_open(Chardev *chr, ChardevBackend *backend, Error **errp)
 {
     ERRP_GUARD();
 
@@ -211,7 +209,7 @@ dbus_chr_open(Chardev *chr, ChardevBackend *backend,
         return;
     }
     CHARDEV_CLASS(object_class_by_name(TYPE_CHARDEV_SOCKET))->chr_open(
-        chr, be, be_opened, errp);
+        chr, be, errp);
 }
 
 static void

ui/gtk.c

@@ -1963,10 +1963,7 @@ static void gd_vc_chr_set_echo(Chardev *chr, bool echo)
 
 static int nb_vcs;
 static Chardev *vcs[MAX_VCS];
-static void gd_vc_chr_open(Chardev *chr,
-                       ChardevBackend *backend,
-                       bool *be_opened,
-                       Error **errp)
+static void gd_vc_chr_open(Chardev *chr, ChardevBackend *backend, Error **errp)
 {
     if (nb_vcs == MAX_VCS) {
         error_setg(errp, "Maximum number of consoles reached");
@@ -1975,10 +1972,10 @@ static void gd_vc_chr_open(Chardev *chr,
 
     vcs[nb_vcs++] = chr;
 
-    /* console/chardev init sometimes completes elsewhere in a 2nd
+    /*
+     * console/chardev init sometimes completes elsewhere in a 2nd
      * stage, so defer OPENED events until they are fully initialized
      */
-    *be_opened = false;
 }
 
 static void char_gd_vc_class_init(ObjectClass *oc, const void *data)

ui/spice-app.c

@@ -49,8 +49,7 @@ struct VCChardev {
 
 struct VCChardevClass {
     ChardevClass parent;
-    void (*parent_open)(Chardev *chr, ChardevBackend *backend,
-                        bool *be_opened, Error **errp);
+    void (*parent_open)(Chardev *chr, ChardevBackend *backend, Error **errp);
 };
 
 #define TYPE_CHARDEV_VC "chardev-vc"
@@ -67,10 +66,7 @@ chr_spice_backend_new(void)
     return be;
 }
 
-static void vc_chr_open(Chardev *chr,
-                        ChardevBackend *backend,
-                        bool *be_opened,
-                        Error **errp)
+static void vc_chr_open(Chardev *chr, ChardevBackend *backend, Error **errp)
 {
     VCChardevClass *vc = CHARDEV_VC_GET_CLASS(chr);
     ChardevBackend *be;
@@ -87,7 +83,7 @@ static void vc_chr_open(Chardev *chr,
     be = chr_spice_backend_new();
     be->u.spiceport.data->fqdn = fqdn ?
         g_strdup(fqdn) : g_strdup_printf("org.qemu.console.%s", chr->label);
-    vc->parent_open(chr, be, be_opened, errp);
+    vc->parent_open(chr, be, errp);
     qapi_free_ChardevBackend(be);
 }
 

ui/vdagent.c

@@ -662,7 +662,6 @@ static void vdagent_chr_recv_clipboard(VDAgentChardev *vd, VDAgentMessage *msg)
 
 static void vdagent_chr_open(Chardev *chr,
                              ChardevBackend *backend,
-                             bool *be_opened,
                              Error **errp)
 {
     VDAgentChardev *vd = QEMU_VDAGENT_CHARDEV(chr);
@@ -692,7 +691,7 @@ static void vdagent_chr_open(Chardev *chr,
                                                    &vdagent_mouse_handler);
     }
 
-    *be_opened = true;
+    qemu_chr_be_event(chr, CHR_EVENT_OPENED);
 }
 
 static void vdagent_clipboard_peer_register(VDAgentChardev *vd)