Fix Ctrl-C, and signals in general, on "logins" in nologin mode

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

docs/TODO.md

@@ -21,7 +21,6 @@ can also be used.
 Before Release
 --------------
 
-* Ctrl-C does not work properly on "logins" in `nologin` mode
 * Running `initctl restart foo` in the background blocks
 
 

src/getty.c

@@ -252,6 +252,7 @@ int sh(char *tty)
 		NULL
 	};
 	size_t len;
+	struct termios term;
 
 	/* Detach from initial controlling TTY */
 	vhangup();
@@ -282,6 +283,17 @@ int sh(char *tty)
 	snprintf(arg0, len, "-%s", _PATH_BSHELL);
 	args[0] = arg0;
 
+	/* Reenable Ctrl-D and Ctrl-C, and ... */
+	if (!tcgetattr(STDIN_FILENO, &term)) {
+		term.c_lflag    |= ISIG;
+		term.c_cc[VEOF]  = CTL('D');
+		term.c_cc[VINTR] = CTL('C');
+		tcsetattr(STDIN_FILENO, TCSANOW, &term);
+	}
+
+	/* ... unblock signals in general */
+	sig_unblock();
+
 	return execv(_PATH_BSHELL, args);
 }