From ee9dcf9549e8cbfeb51123812776cc87016c95b0 Mon Sep 17 00:00:00 2001 From: Mateusz Grzonka Date: Thu, 2 Feb 2023 12:27:02 +0100 Subject: [PATCH] Add helpers to determine whether directories or files are soft links Signed-off-by: Mateusz Grzonka Acked-by: Coly Li Signed-off-by: Jes Sorensen --- mdadm.h | 2 ++ util.c | 45 +++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 47 insertions(+) diff --git a/mdadm.h b/mdadm.h index 13f8b4c..1674ce1 100644 --- a/mdadm.h +++ b/mdadm.h @@ -1777,6 +1777,8 @@ extern void set_dlm_hooks(void); #define MSEC_TO_NSEC(msec) ((msec) * 1000000) #define USEC_TO_NSEC(usec) ((usec) * 1000) extern void sleep_for(unsigned int sec, long nsec, bool wake_after_interrupt); +extern bool is_directory(const char *path); +extern bool is_file(const char *path); #define _ROUND_UP(val, base) (((val) + (base) - 1) & ~(base - 1)) #define ROUND_UP(val, base) _ROUND_UP(val, (typeof(val))(base)) diff --git a/util.c b/util.c index 8c7f3fd..7fc881b 100644 --- a/util.c +++ b/util.c @@ -2401,3 +2401,48 @@ void sleep_for(unsigned int sec, long nsec, bool wake_after_interrupt) } } while (!wake_after_interrupt && errno == EINTR); } + +/* is_directory() - Checks if directory provided by path is indeed a regular directory. + * @path: directory path to be checked + * + * Doesn't accept symlinks. + * + * Return: true if is a directory, false if not + */ +bool is_directory(const char *path) +{ + struct stat st; + + if (lstat(path, &st) != 0) { + pr_err("%s: %s\n", strerror(errno), path); + return false; + } + + if (!S_ISDIR(st.st_mode)) + return false; + + return true; +} + +/* + * is_file() - Checks if file provided by path is indeed a regular file. + * @path: file path to be checked + * + * Doesn't accept symlinks. + * + * Return: true if is a file, false if not + */ +bool is_file(const char *path) +{ + struct stat st; + + if (lstat(path, &st) != 0) { + pr_err("%s: %s\n", strerror(errno), path); + return false; + } + + if (!S_ISREG(st.st_mode)) + return false; + + return true; +} -- 2.35.3