[PATCH v8 06/12] char-stdio: add support for the terminal size

[Filip Hejsek <filip.hejsek@gmail.com>]

From: Szymon Lukasz <noh4hss@gmail.com>

Update the terminal size upon SIGWINCH delivery.

Signed-off-by: Szymon Lukasz <noh4hss@gmail.com>
[Filip: use DECLARE_INSTANCE_CHECKER, qemu_chr_resize_stdio -> stdio_chr_resize]
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Filip Hejsek <filip.hejsek@gmail.com>
---
 chardev/char-stdio.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/chardev/char-stdio.c b/chardev/char-stdio.c
index fe1cbb2d88..4fc8db212c 100644
--- a/chardev/char-stdio.c
+++ b/chardev/char-stdio.c
@@ -34,7 +34,9 @@
 #include "chardev/char-win-stdio.h"
 #else
 #include <termios.h>
+#include <sys/ioctl.h>
 #include "chardev/char-fd.h"
+#include "qemu/main-loop.h"
 #endif
 
 #ifndef _WIN32
@@ -46,6 +48,14 @@ static bool stdio_in_use;
 static bool stdio_allow_signal;
 static bool stdio_echo_state;
 
+typedef struct {
+    FDChardev parent;
+    Notifier resize_notifier;
+} StdioChardev;
+
+DECLARE_INSTANCE_CHECKER(StdioChardev, STDIO_CHARDEV,
+                         TYPE_CHARDEV_STDIO)
+
 static void term_exit(void)
 {
     if (stdio_in_use) {
@@ -85,8 +95,23 @@ static void term_stdio_handler(int sig)
     stdio_chr_set_echo(NULL, stdio_echo_state);
 }
 
+static void stdio_chr_resize(Chardev *chr)
+{
+    struct winsize ws;
+    if (ioctl(1, TIOCGWINSZ, &ws) != -1) {
+        qemu_chr_resize(chr, ws.ws_col, ws.ws_row);
+    }
+}
+
+static void term_resize_notify(Notifier *n, void *data)
+{
+    StdioChardev *s = container_of(n, StdioChardev, resize_notifier);
+    stdio_chr_resize(CHARDEV(s));
+}
+
 static bool stdio_chr_open(Chardev *chr, ChardevBackend *backend, Error **errp)
 {
+    StdioChardev *s = STDIO_CHARDEV(chr);
     ChardevStdio *opts = backend->u.stdio.data;
     struct sigaction act;
 
@@ -121,6 +146,10 @@ static bool stdio_chr_open(Chardev *chr, ChardevBackend *backend, Error **errp)
     stdio_allow_signal = !opts->has_signal || opts->signal;
     stdio_chr_set_echo(chr, false);
 
+    s->resize_notifier.notify = term_resize_notify;
+    sigwinch_add_notifier(&s->resize_notifier);
+    stdio_chr_resize(chr);
+
     qemu_chr_be_event(chr, CHR_EVENT_OPENED);
     return true;
 }
@@ -162,6 +191,7 @@ static const TypeInfo char_stdio_type_info = {
     .parent = TYPE_CHARDEV_WIN_STDIO,
 #else
     .parent = TYPE_CHARDEV_FD,
+    .instance_size = sizeof(StdioChardev),
 #endif
     .instance_finalize = char_stdio_finalize,
     .class_init = char_stdio_class_init,

-- 
2.55.0