zdtm: check a non-controlling terminal

Here are two things:
* A test process is a session leader
* It has a terminal, which are not conrolling for anyone.

For bug #2409
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/zdtm/live/static/Makefile

@@ -66,6 +66,7 @@ TST_NOFILE	=				\
 		pty03				\
 		pty04				\
 		tty00				\
+		tty02				\
 		mountpoints			\
 		netns				\
 		session01			\

test/zdtm/live/static/tty02.c

+#define _XOPEN_SOURCE
+#include <stdlib.h>
+#include "zdtmtst.h"
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <signal.h>
+#include <sys/wait.h>
+#include <termios.h>
+#include <sys/ioctl.h>
+
+const char *test_doc	= "Check a non-controling terminal";
+const char *test_author	= "Andrey Vagin <avagin@openvz.org>";
+
+static void sighup_handler(int signo)
+{
+	test_msg("SIGHUP is here\n");
+}
+
+int main(int argc, char ** argv)
+{
+	int fdm, fds;
+	char *slavename;
+	pid_t sid;
+
+	test_init(argc, argv);
+
+	signal(SIGHUP, sighup_handler);
+
+	setsid();
+
+	fdm = open("/dev/ptmx", O_RDWR);
+	if (fdm == -1) {
+		err("Can't open a master pseudoterminal");
+		return 1;
+	}
+
+	grantpt(fdm);
+	unlockpt(fdm);
+	slavename = ptsname(fdm);
+
+	/* set up a controlling terminal */
+	fds = open(slavename, O_RDWR);
+	if (fds == -1) {
+		err("Can't open a slave pseudoterminal %s", slavename);
+		return 1;
+	}
+
+	if (ioctl(fds, TIOCNOTTY)) {
+		err("Unable to detach a terminal");
+		return 1;
+	}
+
+	test_daemon();
+	test_waitsig();
+
+	if (ioctl(fds, TIOCGSID, &sid) != -1 || errno != ENOTTY) {
+		fail("The tty is a controlling for someone");
+		return 1;
+	}
+
+	pass();
+
+	return 0;
+}