[LTP] [PATCH 3/5] mremap03: Convert to new API

From: Andrea Cervesato <[email protected]>

Convert the mremap03 test case from the legacy LTP API to the new
tst_test API.

Rewrite the test to use TST_EXP_FAIL_PTR_VOID() to verify that
mremap() fails with MAP_FAILED and EFAULT when growing a mapping
whose old_address refers to an unmapped region obtained via
tst_get_bad_addr().

Signed-off-by: Andrea Cervesato <[email protected]>
---
 testcases/kernel/syscalls/mremap/mremap03.c | 203 +++++-----------------------
 1 file changed, 34 insertions(+), 169 deletions(-)

diff --git a/testcases/kernel/syscalls/mremap/mremap03.c b/testcases/kernel/syscalls/mremap/mremap03.c
index 02b79bc47bba0ac576182c00711ff2296aaeaf65..6003657d452ce022daeeb5d54a967cf5b69b6248 100644
--- a/testcases/kernel/syscalls/mremap/mremap03.c
+++ b/testcases/kernel/syscalls/mremap/mremap03.c
@@ -1,187 +1,52 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
- *
- *   Copyright (c) International Business Machines  Corp., 2001
- *
- *   This program is free software;  you can redistribute it and/or modify
- *   it under the terms of the GNU General Public License as published by
- *   the Free Software Foundation; either version 2 of the License, or
- *   (at your option) any later version.
- *
- *   This program is distributed in the hope that it will be useful,
- *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
- *   the GNU General Public License for more details.
- *
- *   You should have received a copy of the GNU General Public License
- *   along with this program;  if not, write to the Free Software
- *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ * Copyright (c) International Business Machines Corp., 2001
+ * 07/2001 Ported by Wayne Boyer
+ * 11/2001 Modified by Manoj Iyer <[email protected]>
+ * Copyright (c) Linux Test Project, 2026
  */
 
-/*
- * Test Name: mremap03
- *
- * Test Description:
- *  Verify that,
- *   mremap() fails when used to expand the existing virtual memory mapped
- *   region to the requested size, if there already exists mappings that
- *   cover the whole address space requsted or the old address specified was
- *   not mapped.
- *
- * Expected Result:
- *  mremap() should return -1 and set errno to EFAULT.
- *
- * Algorithm:
- *  Setup:
- *   Setup signal handling.
- *   Pause for SIGUSR1 if option specified.
- *
- *  Test:
- *   Loop if the proper options are given.
- *   Execute system call
- *   Check return code, if system call failed (return=-1)
- *	if errno set == expected errno
- *		Issue sys call fails with expected return value and errno.
- *	Otherwise,
- *		Issue sys call fails with unexpected errno.
- *   Otherwise,
- *	Issue sys call returns unexpected value.
- *
- *  Cleanup:
- *   Print errno log and/or timing stats if options given
+/*\
+ * Verify that :manpage:`mremap(2)` fails with errno ``EFAULT`` when it is used
+ * to expand a mapping whose ``old_address`` refers to a region that is not
+ * mapped.
  *
- * Usage:  <for command-line>
- *  mremap03 [-c n] [-e] [-i n] [-I x] [-P x] [-t]
- *     where,  -c n : Run n copies concurrently.
- *             -e   : Turn on errno logging.
- *	       -i n : Execute test n times.
- *	       -I x : Execute test for x seconds.
- *	       -p x : Pause for x seconds between iterations.
- *	       -t   : Turn on syscall timing.
+ * [Algorithm]
  *
- * HISTORY
- *	07/2001 Ported by Wayne Boyer
- *
- *      11/09/2001 Manoj Iyer ([email protected])
- *      Modified.
- *      - #include <linux/mman.h> should not be included as per man page for
- *        mremap, #include <sys/mman.h> alone should do the job. But inorder
- *        to include definition of MREMAP_MAYMOVE defined in bits/mman.h
- *        (included by sys/mman.h) __USE_GNU needs to be defined.
- *        There may be a more elegant way of doing this...
- *
- *
- * RESTRICTIONS:
- *  None.
+ * - Obtain an unmapped address via ``tst_get_bad_addr()``.
+ * - Call mremap() to grow it to twice its size with ``MREMAP_MAYMOVE``,
+ *   passing the unmapped ``old_address``.
+ * - Expect the call to fail with ``MAP_FAILED`` and ``EFAULT``.
  */
+
 #define _GNU_SOURCE
-#include <errno.h>
-#include <unistd.h>
-#include <fcntl.h>
 #include <sys/mman.h>
+#include "tst_test.h"
 
-#include "test.h"
-
-char *TCID = "mremap03";
-int TST_TOTAL = 1;
-static char *bad_addr;
-static char *addr;		/* addr of memory mapped region */
-int memsize;			/* memory mapped size */
-int newsize;			/* new size of virtual memory block */
+static long page_size;
+static size_t memsize;
+static size_t newsize;
+static void *bad_addr;
 
-void setup();			/* Main setup function of test */
-void cleanup();			/* cleanup function for the test */
-
-int main(int ac, char **av)
+static void setup(void)
 {
-	int lc;
-
-	tst_parse_opts(ac, av, NULL, NULL);
-
-	setup();
-
-	for (lc = 0; TEST_LOOPING(lc); lc++) {
-
-		tst_count = 0;
-
-		/*
-		 * Attempt to expand the existing mapped
-		 * memory region (memsize) by newsize limits
-		 * using mremap() should fail as specified old
-		 * virtual address was not mapped.
-		 */
-		errno = 0;
-		addr = mremap(bad_addr, memsize, newsize, MREMAP_MAYMOVE);
-		TEST_ERRNO = errno;
-
-		/* Check for the return value of mremap() */
-		if (addr != MAP_FAILED) {
-			tst_resm(TFAIL,
-				 "mremap returned invalid value, expected: -1");
-
-			/* Unmap the mapped memory region */
-			if (munmap(addr, newsize) != 0) {
-				tst_brkm(TFAIL, cleanup, "munmap fails to "
-					 "unmap the expanded memory region, "
-					 " error=%d", errno);
-			}
-			continue;
-		}
-
-		/* Check for the expected errno */
-		if (errno == EFAULT) {
-			tst_resm(TPASS, "mremap() Fails, 'old region not "
-				 "mapped', errno %d", TEST_ERRNO);
-		} else {
-			tst_resm(TFAIL, "mremap() Fails, "
-				 "'Unexpected errno %d", TEST_ERRNO);
-		}
-	}
-
-	cleanup();
-	tst_exit();
+	page_size = getpagesize();
+	memsize = 1000 * page_size;
+	newsize = 2 * memsize;
 
+	bad_addr = tst_get_bad_addr(NULL);
 }
 
-/*
- * setup() - performs all ONE TIME setup for this test.
- *
- * Get system page size.
- * Set the old address point some high address which is not mapped.
- */
-void setup(void)
+static void run(void)
 {
-	int page_sz;		/* system page size */
-
-	tst_sig(FORK, DEF_HANDLER, cleanup);
-
-	TEST_PAUSE;
+	TST_EXP_FAIL_PTR_VOID(mremap(bad_addr, memsize, newsize,
+				     MREMAP_MAYMOVE), EFAULT);
 
-	/* Get the system page size */
-	if ((page_sz = getpagesize()) < 0) {
-		tst_brkm(TFAIL, NULL,
-			 "getpagesize() fails to get system page size");
-	}
-
-	/* Get the size of virtual memory area to be mapped */
-	memsize = (1000 * page_sz);
-
-	/* Get the New size of virtual memory block after resize */
-	newsize = (memsize * 2);
-
-	/*
-	 * Set the old virtual address point to some address
-	 * which is not mapped.
-	 */
-	bad_addr = tst_get_bad_addr(cleanup);
+	if (TST_RET_PTR != MAP_FAILED)
+		SAFE_MUNMAP(TST_RET_PTR, newsize);
 }
 
-/*
- * cleanup() - performs all ONE TIME cleanup for this test at
- *             completion or premature exit.
- */
-void cleanup(void)
-{
-
-	/* Exit the program */
-
-}
+static struct tst_test test = {
+	.setup = setup,
+	.test_all = run,
+};

-- 
2.51.0


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