Merge 1447 "Fix call to rt_sigaction"

> Fix call to rt_sigaction
> Despite the fact that many places imply that sigaction and rt_sigaction
> are essentially the same, rt_sigaction's signature is actually
> different-- it takes the size of the kernel's sigset_t as an extra argument.
> BUG=473973

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Cr-Mirrored-Commit: 80fd81452d0331467a0e5910e57294622cfb2f5e
1 file changed