Re: [SSI-devel] strange inetd/tftp behavior

[John B. <joh...@hp...>]

Christian Lyra wrote:
> Hi, 
> 
> 	what is a "toss with SIGCLUSTER"? I tried to transfer the kernel image with 
> a tftp client and I can only get the image one time after the inetd is 
> started. every other try fail until inetd is restarted. This doesnt happens 
> with a vannila kernel.
> 

Everytime a node joins (actually changes its membership state), 
SIGCLUSTER (stolen from one of the realtime signals) gets sent to all 
the processes on the system. (This was a holdover from the UnixWare 
implementation.) Aneesh suspects your inetd is dying because of this. If 
you strace your inetd and it is dying because it is receiving a signal 
(49 I believe) then Aneesh is correct.

This is to be changed in the near future using the linux fasync 
mechanism. Applications concerned about changes in the cluster 
membership will open a file descriptor in /proc and use the F_SETOWN and 
F_SETSIG fcntls to specify that they receive signals and what signal it 
will be.

John Byrne