Package: qemu Version: 0.9.0-1 Severity: normal It does not seem to be possible to make qemu export its monitor or serial console over tcp, when qemu is the server, and connect to it both robustly and without races.
Here's one attempt: client_program & qemu -serial tcp::port,server In this mode, qemu blocks at startup until a connection is made to the serial port. So the program that will be connecting needs to already be running and polling the port. But this is bad, since the client program presumably needs to give up at some point if it fails to connect, in case qemu never starts. And if it gives up too early, qemu will be left running. Another attempt: qemu -serial tcp::port,server & client_program There's a huge race here, the client program needs to wait for qemu to start listening. And if it fails to connect after a while, it needs to give up in case qemu isn't starting, but if it gives up too soon, qemu is left running. Another: qemu -daemonize -serial tcp::port,server,nowait client_program The nowait option seems like the solution. Except that there's a new race: the client_program might take too long to start, and qemu will be booting in the background in the meantime, so the client program might not be able to access the whole boot process. What qemu needs is a way to make it start listening to the port, then daemonise, and then block until it gets a connection. (This is the point where you tell me the simple, robust, and race-free way to accomplish this that I've been missing. ;-) -- System Information: Debian Release: 4.0 APT prefers unstable APT policy: (500, 'unstable'), (500, 'testing'), (1, 'experimental') Architecture: i386 (i686) Shell: /bin/sh linked to /bin/bash Kernel: Linux 2.6.18-4-686 Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8) Versions of packages qemu depends on: ii bochsbios 2.3-2 BIOS for the Bochs emulator ii libasound2 1.0.13-2 ALSA library ii libc6 2.3.6.ds1-13 GNU C Library: Shared libraries ii libncurses5 5.5-5 Shared libraries for terminal hand ii libsdl1.2debian 1.2.11-8 Simple DirectMedia Layer ii openhackware 0.4.1-2 OpenFirmware emulator for PowerPC ii proll 18-2 JavaStation PROM 2.x compatible re ii vgabios 0.6a-1 VGA BIOS software for the Bochs an ii zlib1g 1:1.2.3-13 compression library - runtime Versions of packages qemu recommends: ii debootstrap 0.3.3.2 Bootstrap a basic Debian system ii sharutils 1:4.2.1-15 shar, unshar, uuencode, uudecode pn vde2 <none> (no description available) -- no debconf information -- see shy jo
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