}
			}
		}()
	}
}

// Closing a TTY while reading from it should not hang.  Issue 23943.
func TestTTYClose(t *testing.T) {
	// Ignore SIGTTIN in case we are running in the background.
	signal.Ignore(syscall.SIGTTIN)
	defer signal.Reset(syscall.SIGTTIN)

	f, err := os.Open("/dev/tty")
	if err != nil {
		t.Skipf("skipping because opening /dev/tty failed: %v", err)
	}

	go func() {

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
used by the shell for job control). The SIGPROF signal is handled
directly by the Go runtime to implement runtime.CPUProfile. Other

	SIGPOLL   = syscall.Signal(0x16)
	SIGPROF   = syscall.Signal(0x1d)
	SIGPWR    = syscall.Signal(0x13)
	SIGSTOP   = syscall.Signal(0x17)
	SIGSYS    = syscall.Signal(0xc)
	SIGTSTP   = syscall.Signal(0x18)
	SIGTTIN   = syscall.Signal(0x1a)
	SIGTTOU   = syscall.Signal(0x1b)
	SIGURG    = syscall.Signal(0x15)
	SIGUSR1   = syscall.Signal(0x10)
	SIGUSR2   = syscall.Signal(0x11)
	SIGVTALRM = syscall.Signal(0x1c)

	SIGPROF   = syscall.Signal(0x1b)
	SIGPWR    = syscall.Signal(0x1e)
	SIGSTKFLT = syscall.Signal(0x10)
	SIGSTOP   = syscall.Signal(0x13)
	SIGSYS    = syscall.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)

	SIGPROF   = syscall.Signal(0x1b)
	SIGPWR    = syscall.Signal(0x1e)
	SIGSTKFLT = syscall.Signal(0x10)
	SIGSTOP   = syscall.Signal(0x13)
	SIGSYS    = syscall.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)

	SIGPROF   = syscall.Signal(0x1b)
	SIGPWR    = syscall.Signal(0x1e)
	SIGSTKFLT = syscall.Signal(0x10)
	SIGSTOP   = syscall.Signal(0x13)
	SIGSYS    = syscall.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)

	_SIGCONT:    {_SigNotify + _SigDefault, "SIGCONT: continue"},
	_SIGSTOP:    {0, "SIGSTOP: stop"},
	_SIGTSTP:    {_SigNotify + _SigDefault, "SIGTSTP: keyboard stop"},
	_SIGTTIN:    {_SigNotify + _SigDefault, "SIGTTIN: background read from tty"},
	_SIGTTOU:    {_SigNotify + _SigDefault, "SIGTTOU: background write to tty"},
	_SIGURG:     {_SigNotify, "SIGURG: urgent condition on socket"},
	_SIGXCPU:    {_SigNotify, "SIGXCPU: cpu limit exceeded"},

	SIGPROF   = syscall.Signal(0x1b)
	SIGPWR    = syscall.Signal(0x1e)
	SIGSTKFLT = syscall.Signal(0x10)
	SIGSTOP   = syscall.Signal(0x13)
	SIGSYS    = syscall.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)

	SIGPROF   = syscall.Signal(0x1b)
	SIGPWR    = syscall.Signal(0x1e)
	SIGSTKFLT = syscall.Signal(0x10)
	SIGSTOP   = syscall.Signal(0x13)
	SIGSYS    = syscall.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)

	SIGPOLL   = syscall.Signal(0x16)
	SIGPROF   = syscall.Signal(0x1d)
	SIGPWR    = syscall.Signal(0x13)
	SIGSTOP   = syscall.Signal(0x17)
	SIGSYS    = syscall.Signal(0xc)
	SIGTSTP   = syscall.Signal(0x18)
	SIGTTIN   = syscall.Signal(0x1a)
	SIGTTOU   = syscall.Signal(0x1b)
	SIGURG    = syscall.Signal(0x15)
	SIGUSR1   = syscall.Signal(0x10)
	SIGUSR2   = syscall.Signal(0x11)
	SIGVTALRM = syscall.Signal(0x1c)