Add chardev option to disable signal.
If I am using vga and serial which is stdio and hit C-c on serial console, qemu terminates. That is annoying for me. So make it configurable whether signal is generated when C-c is hit. Signed-off-by: NKusanagi Kouichi <slash@ac.auone-net.jp> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
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