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Michael Pratt b52cbd6028 Don't allow sigtimedwait to catch unblockable signals 
The existing logic attempting to do this is incorrect. Unary ^ has
higher precedence than &^, so mask always has UnblockableSignals
cleared, allowing dequeueSignalLocked to dequeue unblockable signals
(which allows userspace to ignore them).

Switch the logic so that unblockable signals are always masked.

PiperOrigin-RevId: 244058487
Change-Id: Ib19630ac04068a1fbfb9dc4a8eab1ccbdb21edc3
 		2019-04-17 13:43:20 -07:00
..
syscalls Don't allow sigtimedwait to catch unblockable signals 2019-04-17 13:43:20 -07:00
util netstack: reduce MSS from SYN to account tcp options 2019-03-19 17:33:20 -07:00
BUILD Use toolchain configs from bazel_0.23.0 2019-03-26 15:10:49 -07:00