mmap/mmap14.c: new case to test MAP_LOCKED of mmap

Create test case for MAP_LOCKED of mmap.

Verify pages are locked by checking section "VmLck" of /proc/<pid>/status.

From: "DAN LI" <[email protected]>
To: "LTP list" <[email protected]>
Cc: "Jan Stancek" <[email protected]>
Sent: Tuesday, 2 July, 2013 3:56:17 AM
Subject: [LTP] [PATCH v3] mmap/mmap14.c: new case to test MAP_LOCKED of mmap

Create test case for MAP_LOCKED of mmap.

Verify pages are locked by checking section "VmLck" of /proc/<pid>/status.

Signed-off-by DAN LI <[email protected]>

---
 runtest/syscalls                        |   1 +
 testcases/kernel/syscalls/.gitignore    |   1 +
 testcases/kernel/syscalls/mmap/mmap14.c | 145
 ++++++++++++++++++++++++++++++++
 3 files changed, 147 insertions(+)
 create mode 100644 testcases/kernel/syscalls/mmap/mmap14.c

Hi Jan，

v3:
Add root check.
Add mmap14 to ../.gitignore.

Regards,
DAN LI

runtest/syscalls +1 -0

index 3ab19f5..beb8782 100644
@@ -563,6 +563,7 @@ mmap08 mmap08
 mmap09 mmap09
 mmap12 mmap12
 mmap13 mmap13
+mmap14 mmap14
 # test is broken, mask it for now.
 #mmap11 mmap11 -i 30000
 

testcases/kernel/syscalls/.gitignore +1 -0

index fede145..18d03d4 100644
@@ -515,6 +515,7 @@
 /mmap/mmap11
 /mmap/mmap12
 /mmap/mmap13
+/mmap/mmap14
 /modify_ldt/modify_ldt01
 /modify_ldt/modify_ldt02
 /mount/mount01

testcases/kernel/syscalls/mmap/mmap14.c new file +16 -0

new file mode 100644
index 0000000..25bc48d
@@ -0,0 +1,145 @@
+/*
+ * Copyright (c) 2013 FNST, DAN LI <[email protected]>
+ *
+ * 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
+ */

testcases/kernel/syscalls/mmap/mmap14.c new file +5 -0

+
+/*
+ * Test Description:
+ *  Verify MAP_LOCKED works fine.
+ *  "Lock the pages of the mapped region into memory in the manner of

mlock(2)."
+ *
+ * Expected Result:
+ * mmap() should succeed returning the address of the mapped region,
+ * and this region should be locked into memory.
+ */

testcases/kernel/syscalls/mmap/mmap14.c new file +118 -1

+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <errno.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <string.h>
+#include <signal.h>
+#include <stdint.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
+#include <sys/shm.h>
+
+#include "test.h"
+#include "usctest.h"
+
+#define TEMPFILE        "mmapfile"
+#define MMAPSIZE        (1UL<<20)
+#define LINELEN         256
+
+char *TCID = "mmap14";
+int TST_TOTAL = 1;
+
+static char *addr;
+
+static void getvmlck(unsigned int *lock_sz);
+static void setup(void);
+static void cleanup(void);
+
+int main(int argc, char *argv[])
+{
+	int lc;
+	char *msg;
+	unsigned int sz_before;
+	unsigned int sz_after;
+	unsigned int sz_ch;
+
+	msg = parse_opts(argc, argv, NULL, NULL);
+	if (msg != NULL)
+		tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg);
+
+	setup();
+
+	for (lc = 0; TEST_LOOPING(lc); lc++) {
+
+		tst_count = 0;
+
+		getvmlck(&sz_before);
+
+		addr = mmap(NULL, MMAPSIZE, PROT_READ | PROT_WRITE,
+			    MAP_PRIVATE | MAP_LOCKED | MAP_ANONYMOUS,
+			    -1, 0);
+
+		if (addr == MAP_FAILED) {
+			tst_resm(TFAIL | TERRNO, "mmap of %s failed", TEMPFILE);
+			continue;
+		}
+
+		if (STD_FUNCTIONAL_TEST) {
+
+			getvmlck(&sz_after);
+
+			sz_ch = sz_after - sz_before;
+			if (sz_ch == MMAPSIZE / 1024)
+				tst_resm(TPASS, "Functionality of mmap() "
+						"successful");
+			else
+				tst_resm(TFAIL, "Expected %luK locked, "
+						"get %uK locked",
+						MMAPSIZE / 1024, sz_ch);
+
+		} else {
+			tst_resm(TPASS, "call succeeded");
+		}
+
+		if (munmap(addr, MMAPSIZE) != 0)
+			tst_brkm(TFAIL | TERRNO, NULL, "munmap failed");
+	}
+
+	cleanup();
+	tst_exit();
+
+}
+
+void getvmlck(unsigned int *lock_sz)
+{
+	int ret;
+	char line[LINELEN];
+	FILE *fstatus = NULL;
+
+	fstatus = fopen("/proc/self/status", "r");
+	if (fstatus == NULL)
+		tst_brkm(TFAIL | TERRNO, NULL, "Open dev status failed");
+
+	while (fgets(line, LINELEN, fstatus) != NULL)
+		if (strstr(line, "VmLck") != NULL)
+			break;
+
+	ret = sscanf(line, "%*[^0-9]%d%*[^0-9]", lock_sz);
+	if (ret != 1)
+		tst_brkm(TFAIL | TERRNO, NULL, "Get lock size failed");
+
+	fclose(fstatus);
+}
+
+static void setup(void)
+{
+	tst_require_root(NULL);
+
+	tst_sig(FORK, DEF_HANDLER, cleanup);
+
+	TEST_PAUSE;
+}
+
+static void cleanup(void)
+{
+	TEST_CLEANUP;
+}
--

1.8.1

Quoted 6 lines

Create test case for MAP_LOCKED of mmap.

Verify pages are locked by checking section "VmLck" of /proc/<pid>/status.

Signed-off-by DAN LI <[email protected]>

Reviewed-by Jan Stancek <[email protected]>

Looks good to me. You could probably remove some of those includes, but that's just minor nit.