|
From: | Alain Knaff (qemu) |
Subject: | [Qemu-devel] File descriptor "leak" through /etc/qemu-ifup script |
Date: | Mon, 10 Sep 2007 01:14:08 +0200 |
User-agent: | Thunderbird 2.0.0.6 (X11/20070830) |
Hence any background process spawned from there (such as a dhcpd) will also inherit the open filedescriptor, preventing the relevant decide (/dev/net/tup) to be reused later on:
If for example you chose a fixed network name using the -net ...ifname= option and have an /etc/init.d/dhcp start in your if-up qemu (in order to instruct dhcpd to handle the new interface), the newly spawned dhcp will inherit the filedescriptor controlling the tun device, a continue hogging it even after the qemu is stopped, and is started again.
Workaround: Putting the following into the script: exec 3>/dev/null exec 4>/dev/null exec 5>/dev/null exec 6>/dev/nullBut a cleaner solution would be if qemu itself was careful not to leak those descriptors in the first place.
Thanks, Alain
[Prev in Thread] | Current Thread | [Next in Thread] |