[Qemu-devel] [PATCH 2/5] Introduce -display none

[Jes.Sorensen@redhat.com]

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 |    6 ++++++
 sysemu.h        |    1 +
 vl.c            |    2 ++
 3 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/qemu-options.hx b/qemu-options.hx
index f14ff02..21c0d97 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -615,6 +615,12 @@ you can totally disable graphical output so that QEMU is a simple
 command line application. The emulated serial port is redirected on
 the console. Therefore, you can still use QEMU to debug a Linux kernel
 with a serial console.
+@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 e797e61..8ed4607 100644
--- a/vl.c
+++ b/vl.c
@@ -1577,6 +1577,8 @@ static DisplayType select_display(const char *p)
 #endif
     } else if (strstart(p, "nographic", &opts)) {
         display = DT_NOGRAPHIC;
+    } else if (strstart(p, "none", &opts)) {
+        display = DT_NONE;
     } else {
         fprintf(stderr, "Unknown display type: %s\n", p);
         exit(1);
-- 
1.7.4