zdtm: Add pty03 test

Non-opened control terminal

* Set a control terminal
* Close a file descriptor on it
* Dump/restore
* Open the control terminal (/dev/tty)
* Check, that it connected to the master end
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/zdtm/live/static/Makefile

@@ -54,6 +54,7 @@ TST_NOFILE	=				\
 		pty00				\
 		pty01				\
 		pty02				\
+		pty03				\
 		tty00				\
 		mountpoints			\
 		netns				\

test/zdtm/live/static/pty03.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 <string.h>
+#include <termios.h>
+#include <signal.h>
+#include <sys/ioctl.h>
+
+const char *test_doc	= "Check a non-opened control terminal";
+const char *test_author	= "Andrey Vagin <avagin@openvz.org>";
+
+static const char teststr[] = "ping\n";
+
+int main(int argc, char *argv[])
+{
+	char buf[sizeof(teststr)];
+	int master, slave, ret;
+	char *slavename;
+
+	test_init(argc, argv);
+
+	master = open("/dev/ptmx", O_RDWR);
+	if (master == -1) {
+		err("open(%s) failed", "/dev/ptmx");
+		return 1;
+	}
+
+	grantpt(master);
+	unlockpt(master);
+
+	slavename = ptsname(master);
+	slave = open(slavename, O_RDWR);
+	if (slave == -1) {
+		err("open(%s) failed", slavename);
+		return 1;
+	}
+
+	if (ioctl(slave, TIOCSCTTY, 1)) {
+		err("Can't set a controll terminal");
+		return 1;
+	}
+
+	close(slave);
+
+	test_daemon();
+	test_waitsig();
+
+	slave = open("/dev/tty", O_RDWR);
+	if (slave == -1) {
+		err("Can't open the controll terminal");
+		return -1;
+	}
+
+	signal(SIGHUP, SIG_IGN);
+
+	ret = write(master, teststr, sizeof(teststr) - 1);
+	if (ret != sizeof(teststr) - 1) {
+		err("write(master) failed");
+		return 1;
+	}
+
+	ret = read(slave, buf, sizeof(teststr) - 1);
+	if (ret != sizeof(teststr) - 1) {
+		err("read(slave1) failed");
+		return 1;
+	}
+
+	if (strncmp(teststr, buf, sizeof(teststr) - 1)) {
+		fail("data mismatch");
+		return 1;
+	}
+
+	close(master);
+	close(slave);
+
+	pass();
+
+	return 0;
+}