Revision 4171d32e

b/qemu-options.hx
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DEF("display", HAS_ARG, QEMU_OPTION_display,
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    "-display sdl[,frame=on|off][,alt_grab=on|off][,ctrl_grab=on|off]\n"
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    "            [,window_close=on|off]|curses\n"
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    "            [,window_close=on|off]|curses|none\n"
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    "                select display type\n", QEMU_ARCH_ALL)
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STEXI
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@item -display @var{type}
......
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curses/ncurses interface. Nothing is displayed when the graphics
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device is in graphical mode or if the graphics device does not support
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a text mode. Generally only the VGA device models support text mode.
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@item none
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Do not display video output. The guest will still see an emulated
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graphics card, but its output will not be displayed to the QEMU
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user. This option differs from the -nographic option in that it
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only affects what is done with video output; -nographic also changes
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the destination of the serial and parallel port data.
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@end table
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ETEXI
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b/sysemu.h
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    DT_CURSES,
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    DT_SDL,
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    DT_NOGRAPHIC,
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    DT_NONE,
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} DisplayType;
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extern int autostart;
b/vl.c
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        fprintf(stderr, "Curses support is disabled\n");
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        exit(1);
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#endif
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    } else if (strstart(p, "none", &opts)) {
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        display = DT_NONE;
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    } else {
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    invalid_display:
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        fprintf(stderr, "Unknown display type: %s\n", p);

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