----- 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) {
...
}
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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