Valid signals for USBDEVFS_DISCSIGNAL and uurb->signr

Dear Experts,

It seems that the signal that can be used with USBDEVFS_DISCSIGNAL and 
in usbdevfs_urb.signr is limited to the real-time signals SIGRTMIN to 
SIGRTMAX.  What's the rationale for this restriction?  I believe that a 
process can kill() itself with any signal number, can't it?  I was 
planning to use SIGIO for usbdevfs_urb.signr and SIGTERM (uncaught) for 
USBDEVFS_DISCSIGNAL.  I don't think I'll have a problem with using 
SIGRTMIN+n instead, but I'm curious to know if there's some subtle 
problem with the non-real-time signals that I should be aware of.


Regards,  Phil.





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