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[Qemu-discuss] How to get console output after spawning new process

From: Maciej Bielski
Subject: [Qemu-discuss] How to get console output after spawning new process
Date: Thu, 23 Jul 2015 13:20:47 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0

I am using 'qemu-system-arm' as a Zedboard emulator (Xilinx's branch). I
have extended it with a new device, which is described in device-tree
and a .c file, compiled, detected and initialized when QEMU starts. But
I need a way to talk to that device from outside of QEMU via socket.

So, during device initialization I am spawning another process that runs
server waiting on a socket. Then I can run a program on my host machine
and send some data via the socket. This is working, but because of that
process I can no longer see the output of QEMU's console (so I cannot
log in for example).

1. How to set the current terminal as an output console again?
2. Maybe there already exists a solution to talk to QEMU internals via
socket (-chardev option)?

Thanks for any help or hints.


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