[Fwd: [Xen-users] choose_vnc_display():]

["Brian A. Seklecki" <lavalamp%spiritual-machines.org@localhost>]

FYI -- they're assuming Linux-style IP:PORT output formatting.  The
default "xm create" command fails on NetBSD here.  I dont see a pkgsrc
patch.

  Shall we put one in?

~BAS

-------- Forwarded Message --------
> From: Brian A. Seklecki <lavalamp%spiritual-machines.org@localhost>
> To: xen-users%lists.xensource.com@localhost
> Subject: [Xen-users] choose_vnc_display():
> Date: Thu, 10 Apr 2008 18:18:36 -0400
> 
> All -- we've gotta be careful with assuming formatting output on
> netstat(1).  "-tan" is a generally acceptable set of flags, but some
> distros separate ipaddr+ports by periods "." instead of colon ":".
> 
> All of this out-of-poxis userland+kernel-specific stuff will likely
> need a uname(3) wrapper.
> 
> ~BAS
> 
> 
> def choose_vnc_display():
>     """Try to choose a free vnc display.
>     """
>     def netstat_local_ports():
>         """Run netstat to get a list of the local ports in use.
>         """
>         l = os.popen("netstat -nat").readlines()
>         r = []
>         # Skip 2 lines of header.
>         for x in l[2:]:
>             # Local port is field 3.
>             y = x.split()[3]
>             # Field is addr:port, split off the port.
>             y = y.split(':')[-1]
>             r.append(int(y))
>         return r
> 
>     ports = [1,10000]
>     for d in range(1, 100):
>         port = VNC_BASE_PORT + d
>         if port in ports: continue
>         return d
>     return None
> vncpid = None
> 
> 
> 
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