Patchwork [3/7] Introduce -display none

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Submitter Jes Sorensen
Date March 16, 2011, 11 a.m.
Message ID <1300273214-19586-4-git-send-email-Jes.Sorensen@redhat.com>
Download mbox | patch
Permalink /patch/87235/
State New
Headers show

Comments

Jes Sorensen - March 16, 2011, 11 a.m.
From: Jes Sorensen <Jes.Sorensen@redhat.com>

New option -display none. This option differs from -display nographic
by not trying to take control of stdio etc. but instead behaves as if
a graphics display is enabled, except that it doesn't show one.

Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
---
 qemu-options.hx |    8 +++++++-
 sysemu.h        |    1 +
 vl.c            |    2 ++
 3 files changed, 10 insertions(+), 1 deletions(-)
Peter Maydell - March 16, 2011, 11:51 a.m.
On 16 March 2011 11:00,  <Jes.Sorensen@redhat.com> wrote:
> From: Jes Sorensen <Jes.Sorensen@redhat.com>
>
> New option -display none. This option differs from -display nographic
> by not trying to take control of stdio etc. but instead behaves as if
> a graphics display is enabled, except that it doesn't show one.

Commit message needs updating -- should say "-nographic", not
"-display nographic".

> +@item none
> +Pick the none display option. This option will still run with an
> +emulated graphics card, but none will be displayed to the QEMU
> +user. This options differs from the -nographic option in that QEMU
> +will behave like if one of the display options had been picked, it
> +will not change the control on the command line.
>  @end table

Minor wording tweaks:

"Do not display video output. The guest will still see an emulated
graphics card, but its output will not be displayed to the QEMU
user. This option differs from the -nographic option in that it
only affects what is done with video output; -nographic also changes
the destination of the serial and parallel port data."

-- PMM

Patch

diff --git a/qemu-options.hx b/qemu-options.hx
index 98db829..d4f365a 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -592,7 +592,7 @@  ETEXI
 
 DEF("display", HAS_ARG, QEMU_OPTION_display,
     "-display sdl[,frame=on|off][,alt_grab=on|off][,ctrl_grab=on|off]\n"
-    "            [,window_close=on|off]|curses\n"
+    "            [,window_close=on|off]|curses|none\n"
     "                select display type\n", QEMU_ARCH_ALL)
 STEXI
 @item -display @var{type}
@@ -607,6 +607,12 @@  Pick the curses display option. Normally, QEMU uses SDL to display the
 VGA output.  With this option, QEMU can display the VGA output when in
 text mode using a curses/ncurses interface.  Nothing is displayed in
 graphical mode.
+@item none
+Pick the none display option. This option will still run with an
+emulated graphics card, but none will be displayed to the QEMU
+user. This options differs from the -nographic option in that QEMU
+will behave like if one of the display options had been picked, it
+will not change the control on the command line.
 @end table
 ETEXI
 
diff --git a/sysemu.h b/sysemu.h
index 0a83ab9..c43c7af 100644
--- a/sysemu.h
+++ b/sysemu.h
@@ -110,6 +110,7 @@  typedef enum DisplayType
     DT_CURSES,
     DT_SDL,
     DT_NOGRAPHIC,
+    DT_NONE,
 } DisplayType;
 
 extern int autostart;
diff --git a/vl.c b/vl.c
index 09d4d8c..0a409f4 100644
--- a/vl.c
+++ b/vl.c
@@ -1617,6 +1617,8 @@  static DisplayType select_display(const char *p)
         fprintf(stderr, "Curses support is disabled\n");
         exit(1);
 #endif
+    } else if (strstart(p, "none", &opts)) {
+        display = DT_NONE;
     } else {
     invalid_display:
         fprintf(stderr, "Unknown display type: %s\n", p);