char: Make -chardev help print to stdout

Command line help explicitly requested by the user should be printed
to stdout, not stderr.  We do elsewhere.  Adjust -chardev to match:
use qemu_printf() instead of error_printf().  Plain printf() would be
wrong because we need to print to the current monitor for "chardev-add
help".

Cc: "Marc-André Lureau" <marcandre.lureau@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20190417190641.26814-14-armbru@redhat.com>

diff --git a/chardev/char.c b/chardev/char.c
index 514cd6b0c3faca4d1d0528d064e9e18ac3248375..54724a56b1d8cbccf87aa976f2ac75ec82cb19d8 100644 (file)
--- a/chardev/char.c
+++ b/chardev/char.c
@@ -28,6 +28,7 @@
 #include "sysemu/sysemu.h"
 #include "qemu/config-file.h"
 #include "qemu/error-report.h"
+#include "qemu/qemu-print.h"
 #include "chardev/char.h"
 #include "qapi/error.h"
 #include "qapi/qapi-commands-char.h"
@@ -651,7 +652,7 @@ Chardev *qemu_chr_new_from_opts(QemuOpts *opts, GMainContext *context,
 
         chardev_name_foreach(help_string_append, str);
 
-        error_printf("Available chardev backend types: %s\n", str->str);
+        qemu_printf("Available chardev backend types: %s\n", str->str);
         g_string_free(str, true);
         return NULL;
     }