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Ryan Houdek
4f93259332
Due to how we emulate the guest signal handlers, we do the state setup in the real host signal handler, then we jump out after state setup. This was causing a situation where we were setting up the guest signal handler state with the correct sa_mask. Then after setting up the guest state we would leave the FEX signal handler, restoring the signal mask to our original mask. Instead now as we are setting up the guest state, we save our host signal mask. Then on signal handler return we modify our host signal mask to match what the guest wants. Once we hit our sigreturn emulation we then restore the original signal mask. This looks to improve some stability problems regarding how wine uses signals but it still doesn't fix the gvisor test sadly.