Signal handler arguments

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According to the man page (which, I believe, conforms to the POSIX standard), the third argument in a signal handler should be a pointer to a ucontext structure (assuming the SA_SIGINFO flag was passed to sigaction). However, under Sparc64, the kernel passes a pointer to a sigcontext structure (see line 472 in arch/sparc64/kernel/signal.c). This incompatibility should be either fixed or documented.

--Elad
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