On 04/04/2014 06:01 PM, Jan Stancek wrote:
----- Original Message -----
From: "gux fnst" <gux.f...@cn.fujitsu.com>
To: ltp-list@lists.sourceforge.net
Sent: Thursday, 3 April, 2014 2:00:44 PM
Subject: [LTP] [PATCH v2 1/2] lib/tst_path_has_mnt_flags.c: create a function
tst_path_has_mnt_flags()
Create a function tst_path_has_mnt_flags() for checking whether
a path is on a system that is mounted with specified flags.
Signed-off-by: Xing Gu <gux.f...@cn.fujitsu.com>
---
include/test.h | 9 ++++
lib/tst_path_has_mnt_flags.c | 99
++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 108 insertions(+)
create mode 100644 lib/tst_path_has_mnt_flags.c
diff --git a/include/test.h b/include/test.h
index baa3ef6..39bc5a1 100644
--- a/include/test.h
+++ b/include/test.h
@@ -295,6 +295,15 @@ gid_t tst_get_unused_gid(void);
unsigned short tst_get_unused_port(void (cleanup_fn)(void),
unsigned short family, int type);
+/* lib/tst_path_has_mnt_flags.c
+ *
+ * Check whether a path is on a filesystem that is mounted with
+ * specified flags.
+ * @path: path to file
+ * @flags: mount flags
+ */
+int tst_path_has_mnt_flags(const char *path, const char *flags[]);
+
#ifdef TST_USE_COMPAT16_SYSCALL
#define TCID_BIT_SUFFIX "_16"
#elif TST_USE_NEWER64_SYSCALL
diff --git a/lib/tst_path_has_mnt_flags.c b/lib/tst_path_has_mnt_flags.c
new file mode 100644
index 0000000..257b8a4
--- /dev/null
+++ b/lib/tst_path_has_mnt_flags.c
@@ -0,0 +1,99 @@
+/*
+ * Copyright (c) 2014 Fujitsu Ltd.
+ * Author: Xing Gu <gux.f...@cn.fujitsu.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <unistd.h>
+#include <mntent.h>
+#include "test.h"
+
+/*
+ * Returns if prefix is prefix of a string and the lenght of prefix.
+ */
+int strpref(const char *str, const char *pref)
+{
+ int i;
+
+ for (i = 0; pref[i] != '\0'; i++) {
+ /* string ended too soon */
+ if (str[i] == 0)
+ return -1;
+
+ /* string is diferent */
+ if (str[i] != pref[i])
+ return -1;
+ }
+
+ /* returns lenght of prefix */
+ return i;
+}
+
+/*
+ * Check whether a path is on a filesystem that is mounted with
+ * specified flags.
+ *
+ * Returns:
+ * -1 - an error has occurred
+ * 0 - the filesystem does not have any specified flags
+ * 1 - the filesystem has at least one flag matched
+ */
+int tst_path_has_mnt_flags(const char *path, const char *flags[])
+{
+ struct mntent *mnt;
+ int prefix_max = 0, prefix;
+ int has_flags = 0, has_opt;
+ FILE *f;
+ int i;
+
+ if (path == NULL) {
+ printf("The path is NULL.\n");
+ return -1;
+ }
+
+ if (access(path, F_OK) == -1) {
+ printf("The path %s doesn't exist.\n", path);
+ return -1;
+ }
+
+ f = setmntent("/proc/mounts", "r");
+
+ if (f == NULL) {
+ printf("Couldn't mount /proc/mounts.\n");
+ return -1;
+ }
+
+ while ((mnt = getmntent(f))) {
+ /* ignore all pseudo fs */
+ if (mnt->mnt_fsname[0] != '/')
+ continue;
+
+ prefix = strpref(path, mnt->mnt_dir);
Hi,
Can strpref() return anything other than -1 or strlen(mnt->mnt_dir)?
How about using strncmp instead?
size_t prefix_len = strlen(mnt->mnt_dir);
if (strncmp(path, mnt->mnt_dir, prefix_len) == 0 && prefix_len >
prefix_max) {
...
}
Thank you for your comment. The code using strncmp() is better.
Regards,
Xing Gu
Regards,
Jan
+
+ if (prefix > prefix_max) {
+ prefix_max = prefix;
+ has_opt = 0;
+ i = 0;
+ while ((has_opt == 0) && (flags[i] != NULL)) {
+ has_opt = hasmntopt(mnt, flags[i]) != NULL;
+ i++;
+ }
+ has_flags = has_opt;
+ }
+ }
+
+ endmntent(f);
+
+ return has_flags;
+}
--
1.8.3.1
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