/*  2 */ {_SigNotify + _SigKill, "SIGINT: interrupt"},
	/*  3 */ {_SigNotify + _SigThrow, "SIGQUIT: quit"},
	/*  4 */ {_SigThrow + _SigUnblock, "SIGILL: illegal instruction"},
	/*  5 */ {_SigThrow + _SigUnblock, "SIGTRAP: trace trap"},
	/*  6 */ {_SigNotify + _SigThrow, "SIGABRT: abort"},
	/*  7 */ {_SigThrow, "SIGEMT: emulate instruction executed"},
	/*  8 */ {_SigPanic + _SigUnblock, "SIGFPE: floating-point exception"},

	SIGSTOP     = syscall.Signal(0x11)
	SIGSYS      = syscall.Signal(0xc)
	SIGSYSERROR = syscall.Signal(0x30)
	SIGTALRM    = syscall.Signal(0x26)
	SIGTERM     = syscall.Signal(0xf)
	SIGTRAP     = syscall.Signal(0x5)
	SIGTSTP     = syscall.Signal(0x12)
	SIGTTIN     = syscall.Signal(0x15)
	SIGTTOU     = syscall.Signal(0x16)
	SIGURG      = syscall.Signal(0x10)
	SIGUSR1     = syscall.Signal(0x1e)

	/* 2 */ {_SigNotify + _SigKill, "SIGINT: interrupt"},
	/* 3 */ {_SigNotify + _SigThrow, "SIGQUIT: quit"},
	/* 4 */ {_SigThrow + _SigUnblock, "SIGILL: illegal instruction"},
	/* 5 */ {_SigThrow + _SigUnblock, "SIGTRAP: trace trap"},
	/* 6 */ {_SigNotify + _SigThrow, "SIGABRT: abort"},
	/* 7 */ {_SigPanic + _SigUnblock, "SIGBUS: bus error"},
	/* 8 */ {_SigPanic + _SigUnblock, "SIGFPE: floating-point exception"},
	/* 9 */ {0, "SIGKILL: kill"},

	/* 3 */ {_SigNotify + _SigThrow, "SIGQUIT: quit (ASCII FS)"},
	/* 4 */ {_SigThrow + _SigUnblock, "SIGILL: illegal instruction (not reset when caught)"},
	/* 5 */ {_SigThrow + _SigUnblock, "SIGTRAP: trace trap (not reset when caught)"},
	/* 6 */ {_SigNotify + _SigThrow, "SIGABRT: used by abort, replace SIGIOT in the future"},
	/* 7 */ {_SigThrow, "SIGEMT: EMT instruction"},

// with status 2 if not recovered, which we handle as a crash.
func isCrashSignal(signal os.Signal) bool {
	switch signal {
	case
		syscall.SIGILL,  // illegal instruction
		syscall.SIGTRAP, // breakpoint
		syscall.SIGABRT, // abort() called
		syscall.SIGBUS,  // invalid memory access (e.g., misaligned address)
		syscall.SIGFPE,  // math error, e.g., integer divide by zero

	/*  2 */ {_SigNotify + _SigKill, "SIGINT: interrupt"},
	/*  3 */ {_SigNotify + _SigThrow, "SIGQUIT: quit"},
	/*  4 */ {_SigThrow + _SigUnblock, "SIGILL: illegal instruction"},
	/*  5 */ {_SigThrow + _SigUnblock, "SIGTRAP: trace trap"},
	/*  6 */ {_SigNotify + _SigThrow, "SIGABRT: abort"},
	/*  7 */ {_SigThrow, "SIGEMT"},
	/*  8 */ {_SigPanic + _SigUnblock, "SIGFPE: floating-point exception"},
	/*  9 */ {0, "SIGKILL: kill"},

# Default behavior of signals in Go programs

By default, a synchronous signal is converted into a run-time panic. A
SIGHUP, SIGINT, or SIGTERM signal causes the program to exit. A
SIGQUIT, SIGILL, SIGTRAP, SIGABRT, SIGSTKFLT, SIGEMT, or SIGSYS signal
causes the program to exit with a stack dump. A SIGTSTP, SIGTTIN, or
SIGTTOU signal gets the system default behavior (these signals are

	SIGSTOP     = syscall.Signal(0x11)
	SIGSYS      = syscall.Signal(0xc)
	SIGSYSERROR = syscall.Signal(0x30)
	SIGTALRM    = syscall.Signal(0x26)
	SIGTERM     = syscall.Signal(0xf)
	SIGTRAP     = syscall.Signal(0x5)
	SIGTSTP     = syscall.Signal(0x12)
	SIGTTIN     = syscall.Signal(0x15)
	SIGTTOU     = syscall.Signal(0x16)
	SIGURG      = syscall.Signal(0x10)
	SIGUSR1     = syscall.Signal(0x1e)

	"runtime/debug"
	"sync/atomic"
	"syscall"
	"testing"
)

func startDebugCallWorker(t *testing.T) (g *runtime.G, after func()) {
	// This can deadlock if run under a debugger because it
	// depends on catching SIGTRAP, which is usually swallowed by
	// a debugger.
	skipUnderDebugger(t)

	// This can deadlock if there aren't enough threads or if a GC
	// tries to interrupt an atomic loop (see issue #10958). Execute

}

// A Signal is a number describing a process signal.
// It implements the [os.Signal] interface.
type Signal uint8

const (
	SIGNONE Signal = iota
	SIGHUP
	SIGINT
	SIGQUIT
	SIGILL
	SIGTRAP
	SIGABRT
	SIGBUS
	SIGFPE
	SIGKILL
	SIGUSR1
	SIGSEGV
	SIGUSR2
	SIGPIPE
	SIGALRM
	SIGTERM
	SIGCHLD
	SIGCONT
	SIGSTOP
	SIGTSTP
	SIGTTIN
	SIGTTOU
	SIGURG