SIGPIPE   = Signal(0xd)
	SIGPROF   = Signal(0x1b)
	SIGQUIT   = Signal(0x3)
	SIGSEGV   = Signal(0xb)
	SIGSTOP   = Signal(0x11)
	SIGSYS    = Signal(0xc)
	SIGTERM   = Signal(0xf)
	SIGTRAP   = Signal(0x5)
	SIGTSTP   = Signal(0x12)
	SIGTTIN   = Signal(0x15)
	SIGTTOU   = Signal(0x16)
	SIGURG    = Signal(0x10)
	SIGUSR1   = Signal(0x1e)
	SIGUSR2   = Signal(0x1f)
	SIGVTALRM = Signal(0x1a)

// Without the protection key a request could still get a 404 response when the registered signals changed their status just slightly before reaching the new handler.
// In that case, the presence of the key will make the handler return a 503 instead of a 404.

	return e == EINTR || e == EMFILE || e.Timeout()
}

func (e Errno) Timeout() bool {
	return e == EAGAIN || e == ETIMEDOUT
}

// 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

	SIGPOLL   = Signal(0x1d)
	SIGPROF   = Signal(0x1b)
	SIGPWR    = Signal(0x1e)
	SIGQUIT   = Signal(0x3)
	SIGSEGV   = Signal(0xb)
	SIGSTKFLT = Signal(0x10)
	SIGSTOP   = Signal(0x13)
	SIGSYS    = Signal(0x1f)
	SIGTERM   = Signal(0xf)
	SIGTRAP   = Signal(0x5)
	SIGTSTP   = Signal(0x14)
	SIGTTIN   = Signal(0x15)
	SIGTTOU   = Signal(0x16)
	SIGUNUSED = Signal(0x1f)
	SIGURG    = Signal(0x17)

	SIGIO       = Signal(0x17)
	SIGIOT      = Signal(0x6)
	SIGKILL     = Signal(0x9)
	SIGPIPE     = Signal(0xd)
	SIGPROF     = Signal(0x1b)
	SIGQUIT     = Signal(0x3)
	SIGSEGV     = Signal(0xb)
	SIGSTOP     = Signal(0x11)
	SIGSYS      = Signal(0xc)
	SIGTERM     = Signal(0xf)
	SIGTHR      = Signal(0x20)
	SIGTRAP     = Signal(0x5)
	SIGTSTP     = Signal(0x12)
	SIGTTIN     = Signal(0x15)

	SIGPIPE   = Signal(0xd)
	SIGPROF   = Signal(0x1b)
	SIGQUIT   = Signal(0x3)
	SIGSEGV   = Signal(0xb)
	SIGSTOP   = Signal(0x11)
	SIGSYS    = Signal(0xc)
	SIGTERM   = Signal(0xf)
	SIGTHR    = Signal(0x20)
	SIGTRAP   = Signal(0x5)
	SIGTSTP   = Signal(0x12)
	SIGTTIN   = Signal(0x15)
	SIGTTOU   = Signal(0x16)
	SIGURG    = Signal(0x10)
	SIGUSR1   = Signal(0x1e)
	SIGUSR2   = Signal(0x1f)

	SIGTSTP   = syscall.Signal(0x14)
	SIGTTIN   = syscall.Signal(0x15)
	SIGTTOU   = syscall.Signal(0x16)
	SIGURG    = syscall.Signal(0x17)
	SIGUSR1   = syscall.Signal(0xa)
	SIGUSR2   = syscall.Signal(0xc)
	SIGVTALRM = syscall.Signal(0x1a)
	SIGWINCH  = syscall.Signal(0x1c)
	SIGXCPU   = syscall.Signal(0x18)
	SIGXFSZ   = syscall.Signal(0x19)
)

// Error table
var errorList = [...]struct {
	num  syscall.Errno

	SIGPIPE   = Signal(0xd)
	SIGPROF   = Signal(0x1b)
	SIGQUIT   = Signal(0x3)
	SIGSEGV   = Signal(0xb)
	SIGSTOP   = Signal(0x11)
	SIGSYS    = Signal(0xc)
	SIGTERM   = Signal(0xf)
	SIGTHR    = Signal(0x20)
	SIGTRAP   = Signal(0x5)
	SIGTSTP   = Signal(0x12)
	SIGTTIN   = Signal(0x15)
	SIGTTOU   = Signal(0x16)
	SIGURG    = Signal(0x10)
	SIGUSR1   = Signal(0x1e)
	SIGUSR2   = Signal(0x1f)

	SIGPIPE   = Signal(0xd)
	SIGPROF   = Signal(0x1b)
	SIGQUIT   = Signal(0x3)
	SIGSEGV   = Signal(0xb)
	SIGSTOP   = Signal(0x11)
	SIGSYS    = Signal(0xc)
	SIGTERM   = Signal(0xf)
	SIGTHR    = Signal(0x20)
	SIGTRAP   = Signal(0x5)
	SIGTSTP   = Signal(0x12)
	SIGTTIN   = Signal(0x15)
	SIGTTOU   = Signal(0x16)
	SIGURG    = Signal(0x10)
	SIGUSR1   = Signal(0x1e)
	SIGUSR2   = Signal(0x1f)

	SIGPIPE   = Signal(0xd)
	SIGPROF   = Signal(0x1b)
	SIGQUIT   = Signal(0x3)
	SIGSEGV   = Signal(0xb)
	SIGSTOP   = Signal(0x11)
	SIGSYS    = Signal(0xc)
	SIGTERM   = Signal(0xf)
	SIGTHR    = Signal(0x20)
	SIGTRAP   = Signal(0x5)
	SIGTSTP   = Signal(0x12)
	SIGTTIN   = Signal(0x15)
	SIGTTOU   = Signal(0x16)
	SIGURG    = Signal(0x10)
	SIGUSR1   = Signal(0x1e)
	SIGUSR2   = Signal(0x1f)