[LTP] [PATCH 05/10] Add ptem04 test

[Andrea Cervesato]

From: Andrea Cervesato <andrea.cervesato@suse.com>

Verify that it's possible to open a pseudo-terminal via /dev/ptmx,
obtain a slave device and to check if it's possible to open it
multiple times.

Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.com>
---
 runtest/pty                     |  1 +
 testcases/kernel/pty/.gitignore |  1 +
 testcases/kernel/pty/ptem04.c   | 57 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 59 insertions(+)

diff --git a/runtest/pty b/runtest/pty
index 329cc84cdc107ab8e814fea72a8088ea62d5ad25..63d927eca07aa3dbd312d5c5cc6b6681dbf3627d 100644
--- a/runtest/pty
+++ b/runtest/pty
@@ -9,5 +9,6 @@ pty07 pty07
 ptem01 ptem01
 ptem02 ptem02
 ptem03 ptem03
+ptem04 ptem04
 hangup01 hangup01
 
diff --git a/testcases/kernel/pty/.gitignore b/testcases/kernel/pty/.gitignore
index 61fec1ddae3ea39d20e97123e34888708050c25c..c9bb33664f9de55038f4638406841f403f1a86c4 100644
--- a/testcases/kernel/pty/.gitignore
+++ b/testcases/kernel/pty/.gitignore
@@ -2,6 +2,7 @@
 /ptem01
 /ptem02
 /ptem03
+/ptem04
 /pty01
 /pty02
 /pty03
diff --git a/testcases/kernel/pty/ptem04.c b/testcases/kernel/pty/ptem04.c
new file mode 100644
index 0000000000000000000000000000000000000000..ff91616db9d0d54b0a40477867ce30fff24cae00
--- /dev/null
+++ b/testcases/kernel/pty/ptem04.c
@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) International Business Machines  Corp., 2002
+ * Copyright (c) 2020 Petr Vorel <pvorel@suse.cz>
+ * Copyright (C) 2024 SUSE LLC Andrea Cervesato <andrea.cervesato@suse.com>
+ */
+
+/*\
+ * [Description]
+ *
+ * Verify that it's possible to open a pseudo-terminal via /dev/ptmx, obtain a
+ * slave device and to check if it's possible to open it multiple times.
+ */
+
+#define _GNU_SOURCE
+
+#include "tst_test.h"
+
+#define MASTERCLONE "/dev/ptmx"
+#define NUM_SLAVES 10
+
+static void run(void)
+{
+	int masterfd;
+	int slavefd[NUM_SLAVES];
+	char *slavename;
+
+	masterfd = SAFE_OPEN(MASTERCLONE, O_RDWR);
+
+	slavename = ptsname(masterfd);
+	if (slavename == NULL)
+		tst_res(TFAIL, "Can't get slave device location");
+	else
+		tst_res(TPASS, "pts device location is %s", slavename);
+
+	TST_EXP_PASS(grantpt(masterfd));
+	TST_EXP_PASS(unlockpt(masterfd));
+
+	for (int i = 0; i < NUM_SLAVES; i++)
+		slavefd[i] = TST_EXP_FD(open(slavename, O_RDWR));
+
+	for (int i = 0; i < NUM_SLAVES; i++)
+		SAFE_CLOSE(slavefd[i]);
+
+	SAFE_CLOSE(masterfd);
+}
+
+static void setup(void)
+{
+	if (access(MASTERCLONE, F_OK))
+		tst_brk(TBROK, "%s device doesn't exist", MASTERCLONE);
+}
+
+static struct tst_test test = {
+	.test_all = run,
+	.setup = setup,
+};

-- 
2.43.0