This function should be called whenever we learn about a new size of
the terminal connected to a chardev.

Signed-off-by: Szymon Lukasz <noh4hss@gmail.com>
---
 chardev/char.c         | 11 +++++++++++
 include/chardev/char.h |  2 ++
 2 files changed, 13 insertions(+)

diff --git a/chardev/char.c b/chardev/char.c
index 904f8bf6e3..1dc22aca95 100644
--- a/chardev/char.c
+++ b/chardev/char.c
@@ -354,6 +354,17 @@ int qemu_chr_wait_connected(Chardev *chr, Error **errp)
     return 0;
 }
 
+void qemu_chr_resize(Chardev *chr, uint16_t cols, uint16_t rows)
+{
+    if (cols != chr->cols || rows != chr->rows) {
+        chr->cols = cols;
+        chr->rows = rows;
+        if (chr->be_open) {
+            qemu_chr_be_event(chr, CHR_EVENT_RESIZE);
+        }
+    }
+}
+
 QemuOpts *qemu_chr_parse_compat(const char *label, const char *filename,
                                 bool permit_mux_mon)
 {
diff --git a/include/chardev/char.h b/include/chardev/char.h
index 42203e9fa4..01099121f1 100644
--- a/include/chardev/char.h
+++ b/include/chardev/char.h
@@ -230,6 +230,8 @@ int qemu_chr_write(Chardev *s, const uint8_t *buf, int len, bool write_all);
 #define qemu_chr_write_all(s, buf, len) qemu_chr_write(s, buf, len, true)
 int qemu_chr_wait_connected(Chardev *chr, Error **errp);
 
+void qemu_chr_resize(Chardev *chr, uint16_t cols, uint16_t rows);
+
 #define TYPE_CHARDEV "chardev"
 #define CHARDEV(obj) OBJECT_CHECK(Chardev, (obj), TYPE_CHARDEV)
 #define CHARDEV_CLASS(klass) \
-- 
2.27.0