Difference between signal related structures

[Joseph Koshy]

ps> Can anybody tell me that why there are two different structures named
ps> 1)struct   sigcontext
ps> 2)struct   osigcontext
ps> are defined in /sys/i386/include/signal.h
ps> I want to know what is basic difference between them?

 % cvs log -r1.10 /usr/src/sys/i386/include/signal.h
 % cvs log -r1.11 /usr/src/sys/i386/include/signal.h

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