## signals that cannot be caught
sys.sig-catch sys.SIGKILL ##ERROR: not routable

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sys.sig-catch sys.SIGSTOP ##ERROR: not routable

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## signals that indicate a crash: turning one into a byte on a pipe and
## carrying on would hide the fault rather than report it
sys.sig-catch sys.SIGSEGV ##ERROR: not routable

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sys.sig-catch sys.SIGBUS ##ERROR: not routable

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sys.sig-catch sys.SIGFPE ##ERROR: not routable

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sys.sig-catch sys.SIGILL ##ERROR: not routable

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## the timer signal hak itself uses to switch processes
sys.sig-catch sys.SIGVTALRM ##ERROR: not routable

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sys.sig-catch 0 ##ERROR: 0 not routable

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sys.sig-catch 9999 ##ERROR: 9999 not routable

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sys.sig-catch "two" ##ERROR: number not a small integer