[LTP] [PATCH v1] Add readlink04 test

[Andrea Cervesato]

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

This test has been extracted from symlink01 and it verifies that
readlink() is working correctly on symlink() generated files.

Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.com>
---
 runtest/syscalls                              |  2 +-
 testcases/kernel/syscalls/readlink/.gitignore |  1 +
 .../kernel/syscalls/readlink/readlink04.c     | 57 +++++++++++++++++++
 3 files changed, 59 insertions(+), 1 deletion(-)
 create mode 100644 testcases/kernel/syscalls/readlink/readlink04.c

diff --git a/runtest/syscalls b/runtest/syscalls
index 6e2407879..339697533 100644
--- a/runtest/syscalls
+++ b/runtest/syscalls
@@ -1125,9 +1125,9 @@ readahead02 readahead02
 readdir01 readdir01
 readdir21 readdir21
 
-readlink01A symlink01 -T readlink01
 readlink01 readlink01
 readlink03 readlink03
+readlink04 readlink04
 
 #readlinkat test cases
 readlinkat01 readlinkat01
diff --git a/testcases/kernel/syscalls/readlink/.gitignore b/testcases/kernel/syscalls/readlink/.gitignore
index 307817f4d..53e65eb5b 100644
--- a/testcases/kernel/syscalls/readlink/.gitignore
+++ b/testcases/kernel/syscalls/readlink/.gitignore
@@ -1,2 +1,3 @@
 /readlink01
 /readlink03
+/readlink04
diff --git a/testcases/kernel/syscalls/readlink/readlink04.c b/testcases/kernel/syscalls/readlink/readlink04.c
new file mode 100644
index 000000000..8d7d038bb
--- /dev/null
+++ b/testcases/kernel/syscalls/readlink/readlink04.c
@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2000 Silicon Graphics, Inc.  All Rights Reserved.
+ *    Author: David Fenner
+ *    Copilot: Jon Hendrickson
+ * Copyright (C) 2024 Andrea Cervesato <andrea.cervesato@suse.com>
+ */
+
+/*\
+ * [Description]
+ *
+ * This test verifies that readlink() is working correctly on symlink()
+ * generated files.
+ */
+
+#include "tst_test.h"
+
+static void test_readlink(void)
+{
+	char *symname = "my_symlink0";
+
+	SAFE_SYMLINK(tst_get_tmpdir(), symname);
+
+	char path[PATH_MAX];
+	struct stat path_link;
+
+	SAFE_READLINK(symname, path, PATH_MAX);
+	TST_EXP_PASS(lstat(path, &path_link));
+
+	SAFE_UNLINK(symname);
+}
+
+static void test_readlink_no_path(void)
+{
+	char *symname = "my_symlink1";
+
+	SAFE_SYMLINK("bc+eFhi!k", symname);
+
+	char path[PATH_MAX];
+	struct stat path_link;
+
+	SAFE_READLINK(symname, path, PATH_MAX);
+	TST_EXP_FAIL(lstat(path, &path_link), ENOENT);
+
+	SAFE_UNLINK(symname);
+}
+
+static void run(void)
+{
+	test_readlink();
+	test_readlink_no_path();
+}
+
+static struct tst_test test = {
+	.test_all = run,
+	.needs_tmpdir = 1,
+};
-- 
2.35.3