[LTP] [PATCH v3] Migrating the libhugetlbfs/testcases/truncate.c test

[Shirisha G <shirisha@linux.ibm.com>]

Test Description:
Test is used to verify the correct functionality and
compatibility of the library with the "truncate" system
call when operating on files residing in a mounted
huge page filesystem.

Signed-off-by: Shirisha G <shirisha@linux.ibm.com>
---
v3:
 -Addressed the below requested changes 
  1. Removed RANDOM_CONSTANT
  2. Made hpage_size and fd to static
  3. Used a volatile variable as a flag
     to pass test in the run_test()
  4. Removed the failure condition for SAFE_MMAP()
  5. Have setup the handler in the setup()
  6. Added SAFE_MUNMAP()
  7. Ran make check and fixed all issues
---
v2:
 -Corrected typo
---
 runtest/hugetlb                               |  1 +
 testcases/kernel/mem/.gitignore               |  1 +
 .../kernel/mem/hugetlb/hugemmap/hugemmap33.c  | 88 +++++++++++++++++++
 3 files changed, 90 insertions(+)
 create mode 100644 testcases/kernel/mem/hugetlb/hugemmap/hugemmap33.c

diff --git a/runtest/hugetlb b/runtest/hugetlb
index 299c07ac9..1300e80fb 100644
--- a/runtest/hugetlb
+++ b/runtest/hugetlb
@@ -35,6 +35,7 @@ hugemmap29 hugemmap29
 hugemmap30 hugemmap30
 hugemmap31 hugemmap31
 hugemmap32 hugemmap32
+hugemmap33 hugemmap33
 hugemmap05_1 hugemmap05 -m
 hugemmap05_2 hugemmap05 -s
 hugemmap05_3 hugemmap05 -s -m
diff --git a/testcases/kernel/mem/.gitignore b/testcases/kernel/mem/.gitignore
index 7258489ed..d130d4dcd 100644
--- a/testcases/kernel/mem/.gitignore
+++ b/testcases/kernel/mem/.gitignore
@@ -34,6 +34,7 @@
 /hugetlb/hugemmap/hugemmap30
 /hugetlb/hugemmap/hugemmap31
 /hugetlb/hugemmap/hugemmap32
+/hugetlb/hugemmap/hugemmap33
 /hugetlb/hugeshmat/hugeshmat01
 /hugetlb/hugeshmat/hugeshmat02
 /hugetlb/hugeshmat/hugeshmat03
diff --git a/testcases/kernel/mem/hugetlb/hugemmap/hugemmap33.c b/testcases/kernel/mem/hugetlb/hugemmap/hugemmap33.c
new file mode 100644
index 000000000..3405627f6
--- /dev/null
+++ b/testcases/kernel/mem/hugetlb/hugemmap/hugemmap33.c
@@ -0,0 +1,88 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2005-2006 IBM Corporation.
+ * Author: David Gibson & Adam Litke
+ */
+
+/*\
+ * [Description]
+ *
+ * Test Name: truncate
+ *
+ * Test case is used to verify the correct functionality
+ * and compatibility of the library with the "truncate" system call when
+ * operating on files residing in a mounted huge page filesystem.
+ */
+
+#include "hugetlb.h"
+#include <setjmp.h>
+#include <signal.h>
+
+#define MNTPOINT "hugetlbfs/"
+
+static long hpage_size;
+static int fd;
+static sigjmp_buf sig_escape;
+static volatile int test_pass;
+static int sigbus_count;
+
+static void sigbus_handler(int signum)
+{
+	test_pass = 1;
+	siglongjmp(sig_escape, 17);
+}
+
+static void run_test(void)
+{
+	void *p;
+	volatile unsigned int *q;
+
+	sigbus_count = 0;
+	test_pass = 0;
+	int err;
+
+	p = SAFE_MMAP(NULL, hpage_size, PROT_READ|PROT_WRITE, MAP_SHARED,
+			fd, 0);
+	q = p;
+	*q = 0;
+	err = ftruncate(fd, 0);
+	if (err)
+		tst_res(TFAIL, "ftruncate failed");
+	if (sigsetjmp(sig_escape, 1) == 0)
+		*q;
+	else
+		sigbus_count++;
+	if (sigbus_count != 1)
+		tst_res(TFAIL, "Didn't SIGBUS");
+	if (test_pass == 1)
+		tst_res(TPASS, "Expected SIGBUS triggered");
+	SAFE_MUNMAP(p, hpage_size);
+}
+
+
+void setup(void)
+{
+	struct sigaction my_sigaction;
+
+	my_sigaction.sa_handler = sigbus_handler;
+	SAFE_SIGACTION(SIGBUS, &my_sigaction, NULL);
+	hpage_size = tst_get_hugepage_size();
+	fd = tst_creat_unlinked(MNTPOINT, 0);
+}
+
+void cleanup(void)
+{
+	if (fd > 0)
+		SAFE_CLOSE(fd);
+}
+
+static struct tst_test test = {
+	.needs_root = 1,
+	.mntpoint = MNTPOINT,
+	.needs_hugetlbfs = 1,
+	.needs_tmpdir = 1,
+	.setup = setup,
+	.cleanup = cleanup,
+	.test_all = run_test,
+	.hugepages = {1, TST_NEEDS},
+};
-- 
2.39.3


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