1 files changed, 13 insertions, 1 deletions
diff --git a/qemu-char.c b/qemu-char.c
index 2969c44e84..66703e3f0a 100644
--- a/qemu-char.c
+++ b/qemu-char.c
@@ -3484,6 +3484,9 @@ static void qemu_chr_parse_file_out(QemuOpts *opts, ChardevBackend *backend,
     }
     backend->u.file = g_new0(ChardevFile, 1);
     backend->u.file->out = g_strdup(path);
+
+    backend->u.file->has_append = true;
+    backend->u.file->append = qemu_opt_get_bool(opts, "append", false);
 }
 
 static void qemu_chr_parse_stdio(QemuOpts *opts, ChardevBackend *backend,
@@ -4041,6 +4044,9 @@ QemuOptsList qemu_chardev_opts = {
         },{
             .name = "chardev",
             .type = QEMU_OPT_STRING,
+        },{
+            .name = "append",
+            .type = QEMU_OPT_BOOL,
         },
         { /* end of list */ }
     },
@@ -4101,7 +4107,13 @@ static CharDriverState *qmp_chardev_open_file(const char *id,
     ChardevFile *file = backend->u.file;
     int flags, in = -1, out;
 
-    flags = O_WRONLY | O_TRUNC | O_CREAT | O_BINARY;
+    flags = O_WRONLY | O_CREAT | O_BINARY;
+    if (file->has_append && file->append) {
+        flags |= O_APPEND;
+    } else {
+        flags |= O_TRUNC;
+    }
+
     out = qmp_chardev_open_file_source(file->out, flags, errp);
     if (out < 0) {
         return NULL;