softflowd shuts down after pcap EOF

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What steps will reproduce the problem?
- softflowd stops/crashes after a few hours/days of running with the following 
output:

Shutting down after pcap EOF
Shutting down on user request

What version of the product are you using? On what operating system?
softflowd 0.9.8
Linux 2.6.27.7-9-pae #1 SMP 2008-12-04 18:10:04 +0100 i686 i686 i386 GNU/Linux

Please provide any additional information below.
I've commented "graceful_shutdown_request = 1" (line 1872 in softflowd.c) then 
got: 

Shutting down after pcap EOF
Exiting immediately on user request

Original issue reported on code.google.com by [email protected] on 21 Nov 2011 at 9:13