1 files changed, 20 insertions, 1 deletions
diff --git a/include/sysemu/char.h b/include/sysemu/char.h
index 0d0465ae0e..19dad3fb9c 100644
--- a/include/sysemu/char.h
+++ b/include/sysemu/char.h
@@ -9,6 +9,7 @@
 #include "qapi/qmp/qobject.h"
 #include "qapi/qmp/qstring.h"
 #include "qemu/main-loop.h"
+#include "qemu/bitmap.h"
 
 /* character device */
 
@@ -58,6 +59,20 @@ struct ParallelIOArg {
 
 typedef void IOEventHandler(void *opaque, int event);
 
+typedef enum {
+    /* Whether the chardev peer is able to close and
+     * reopen the data channel, thus requiring support
+     * for qemu_chr_wait_connected() to wait for a
+     * valid connection */
+    QEMU_CHAR_FEATURE_RECONNECTABLE,
+    /* Whether it is possible to send/recv file descriptors
+     * over the data channel */
+    QEMU_CHAR_FEATURE_FD_PASS,
+
+    QEMU_CHAR_FEATURE_LAST,
+} CharDriverFeature;
+
+
 struct CharDriverState {
     QemuMutex chr_write_lock;
     void (*init)(struct CharDriverState *s);
@@ -93,8 +108,8 @@ struct CharDriverState {
     int avail_connections;
     int is_mux;
     guint fd_in_tag;
-    QemuOpts *opts;
     bool replay;
+    DECLARE_BITMAP(features, QEMU_CHAR_FEATURE_LAST);
     QTAILQ_ENTRY(CharDriverState) next;
 };
 
@@ -437,6 +452,10 @@ int qemu_chr_add_client(CharDriverState *s, int fd);
 CharDriverState *qemu_chr_find(const char *name);
 bool chr_is_ringbuf(const CharDriverState *chr);
 
+bool qemu_chr_has_feature(CharDriverState *chr,
+                          CharDriverFeature feature);
+void qemu_chr_set_feature(CharDriverState *chr,
+                          CharDriverFeature feature);
 QemuOpts *qemu_chr_parse_compat(const char *label, const char *filename);
 
 void register_char_driver(const char *name, ChardevBackendKind kind,