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Re: [Qemu-devel] Qemu socket address
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-devel] Qemu socket address |
Date: |
Thu, 23 Mar 2017 17:24:49 +0000 |
On Thu, Mar 23, 2017 at 4:11 PM, Ashish Gahlot <address@hidden> wrote:
> Actually, I'm trying to run two separate Qemu processes and the command line
> argument is "qemu-system-x86_64 -kernel kernel -S -s" and the error which I
> get on second invocation is
> > qemu-system-x86_64: -s: Failed to bind socket: Address already in use
Please keep address@hidden CCed so that the conversation stays
on the mailing list.
This is expected behavior. The man page says:
-s Shorthand for -gdb tcp::1234, i.e. open a gdbserver on TCP port 1234.
Two processes cannot listen on the same port*, even with SO_REUSEADDR.
Please specify unique port numbers using the longer syntax from the man page:
$ qemu-system-x86_64 -kernel kernel -S -gdb tcp::1234
$ qemu-system-x86_64 -kernel kernel -S -gdb tcp::1235
Now you can tell gdb which QEMU instance to connect to.
Stefan
* There is a Linux-specific socket option for allowing multiple
processes to listen on the same port but it's meant for load balancing
and wouldn't help in this case.