signal 6 meaning?

[Mipam]

Hi,

Sory for the luser question.
What's signal 6?

kernel: pid 567 (clamd), uid 1006: exited on signal 6

Where can i rtfm on signals?
This is in /var/log/clam/clamd.log (so nothing .... :-()

+++ Started at Mon Apr  5 13:23:48 2004
      Log file size limited to 2097152 bytes.
      Verbose logging activated.
      Running as user clamav (UID 1006, GID 1007)
      Reading databases from /usr/local/share/clamav
      Protecting against 20832 viruses.
      Unix socket file /var/run/clamav/clamd
      Setting connection queue length to 15
      Listening daemon: PID: 567
     Archive: Archived file size limit set to 10485760 bytes.
     Archive: Recursion level limit set to 5.
     Archive: Files limit set to 1000.
     WARNING: USING HARDCODED LIMIT: Archive: Compression ratio limit set to
200.
     Archive support enabled.
     RAR support disabled.
     Mail files support enabled.
     OLE2 support disabled.
     Self checking every 3600 seconds.
Bye,

Mipam.