zdtm: add two test cases for tty-s

* check, that pseudoterminals are restored
* check, that a control terminal is restred
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/zdtm/live/static/Makefile

@@ -48,6 +48,8 @@ TST_NOFILE	=				\
 		inotify00			\
 		uptime_grow			\
 		session00			\
+		pty00				\
+		tty00				\
 #		jobctl00			\
 
 TST_FILE	=				\

test/zdtm/live/static/pty00.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>
+
+const char *test_doc	= "Check, that pseudoterminals are restored";
+const char *test_author	= "Andrey Vagin <avagin@openvz.org>";
+
+int main(int argc, char ** argv)
+{
+	int fdm, fds, ret;
+	char *slavename;
+	char buf[10];
+	const char teststr[] = "hello\n";
+
+	test_init(argc, argv);
+
+	fdm = open("/dev/ptmx", O_RDWR);
+	if (fdm == -1) {
+		err("open(%s) failed", "/dev/ptmx");
+		return 1;
+	}
+	grantpt(fdm);
+	unlockpt(fdm);
+	slavename = ptsname(fdm);
+	fds = open(slavename, O_RDWR);
+	if (fds == -1) {
+		err("open(%s) failed", slavename);
+		return 1;
+	}
+
+	/* Try to reproduce a deadlock */
+	if (dup2(fdm, 101) != 101) {
+		err("dup( , 101) failed");
+		return 1;
+	}
+	close(fdm);
+	fdm = 101;
+
+	if (dup2(fds, 100) != 100) {
+		err("dup( , 100) failed");
+		return 1;
+	}
+	close(fds);
+	fds = 100;
+
+	test_daemon();
+
+	test_waitsig();
+
+	signal(SIGHUP, SIG_IGN);
+
+	/* Check connectivity */
+	ret = write(fdm, teststr, sizeof(teststr) - 1);
+	if (ret != sizeof(teststr) - 1) {
+		err("write(fdm) failed");
+		return 1;
+	}
+
+	ret = read(fds, buf, sizeof(teststr) - 1);
+	if (ret != sizeof(teststr) - 1) {
+		err("read(fds) failed");
+		return 1;
+	}
+
+	if (strncmp(teststr, buf, sizeof(teststr) - 1)) {
+		fail("data mismatch");
+		return 1;
+	}
+
+	close(fdm);
+	close(fds);
+
+	pass();
+
+	return 0;
+}

test/zdtm/live/static/tty00.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 that a control terminal is restored";
+const char *test_author	= "Andrey Vagin <avagin@openvz.org>";
+
+static int sighup = 0;
+static void sighup_handler(int signo)
+{
+	test_msg("SIGHUP is here\n");
+	sighup = 1;
+}
+
+int main(int argc, char ** argv)
+{
+	int fdm, fds, status;
+	char *slavename;
+	pid_t pid;
+
+	test_init(argc, argv);
+
+	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);
+
+	pid = test_fork();
+	if (pid < 0) {
+		err("fork() failed");
+		return 1;
+	}
+
+	if (pid == 0) {
+		close(fdm);
+		signal(SIGHUP, sighup_handler);
+
+		if (setsid() == -1)
+			return 1;
+
+		/* 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(fdm, TIOCSCTTY, 1) < 0) {
+			err("Can't setup a controlling terminal");
+			return 1;
+		}
+		close(fds);
+
+		test_waitsig();
+		if (sighup)
+			return 0;
+		return 1;
+	}
+
+
+	test_daemon();
+
+	test_waitsig();
+
+	close(fdm);
+
+	if (kill(pid, SIGTERM) == -1) {
+		err("kill failed");
+		return 1;
+	}
+
+	pid = waitpid(pid, &status, 0);
+	if (pid < 0)
+		return 1;
+
+	if (WIFEXITED(status)) {
+		if (WEXITSTATUS(status)) {
+			fail("The child returned %d", WEXITSTATUS(status));
+			return 1;
+		}
+	} else
+		err("The child has been killed by %d", WTERMSIG(status));
+
+	pass();
+
+	return 0;
+}