/*
- * syfs_utils.c
+ * sysfs_utils.c
*
* System utility functions for libsysfs
*
#include "sysfs.h"
/**
- * sysfs_get_mnt_path: Gets the mount point for specified filesystem.
- * @fs_type: filesystem type to retrieve mount point
- * @mnt_path: place to put the retrieved mount path
- * @len: size of mnt_path
- * returns 0 with success and -1 with error.
- */
-static int sysfs_get_fs_mnt_path(const unsigned char *fs_type,
- unsigned char *mnt_path, size_t len)
+ * sysfs_remove_trailing_slash: Removes any trailing '/' in the given path
+ * @path: Path to look for the trailing '/'
+ * Returns 0 on success 1 on error
+ */
+int sysfs_remove_trailing_slash(char *path)
{
- FILE *mnt;
- struct mntent *mntent;
- int ret = 0;
- size_t dirlen = 0;
+ char *c = NULL;
- /* check arg */
- if (fs_type == NULL || mnt_path == NULL) {
+ if (!path) {
errno = EINVAL;
- return -1;
- }
-
- if ((mnt = setmntent(SYSFS_PROC_MNTS, "r")) == NULL) {
- dprintf("Error getting mount information\n");
- return -1;
- }
- while (ret == 0 && dirlen == 0 && (mntent = getmntent(mnt)) != NULL) {
- if (strcmp(mntent->mnt_type, fs_type) == 0) {
- dirlen = strlen(mntent->mnt_dir);
- if (dirlen <= (len - 1)) {
- strcpy(mnt_path, mntent->mnt_dir);
- } else {
- dprintf("Error - mount path too long\n");
- ret = -1;
- }
- }
+ return 1;
}
- endmntent(mnt);
- if (dirlen == 0 && ret == 0) {
- dprintf("Filesystem %s not found!\n", fs_type);
+ c = strrchr(path, '/');
+ if (c == NULL) {
+ dprintf("Invalid path %s\n", path);
errno = EINVAL;
- ret = -1;
+ return 1;
}
- return ret;
+ if (*(c+1) == '\0')
+ *c = '\0';
+ return 0;
}
/*
* @len: size of mnt_path
* returns 0 with success and -1 with error.
*/
-int sysfs_get_mnt_path(unsigned char *mnt_path, size_t len)
+int sysfs_get_mnt_path(char *mnt_path, size_t len)
{
- int ret = -1;
-
- if (mnt_path != NULL)
- ret = sysfs_get_fs_mnt_path(SYSFS_FSTYPE_NAME, mnt_path, len);
- else
- errno = EINVAL;
+ static char sysfs_path[SYSFS_PATH_MAX] = "";
+ const char *sysfs_path_env;
+
+ /* evaluate only at the first call */
+ if (sysfs_path[0] == '\0') {
+ /* possible overrride of real mount path */
+ sysfs_path_env = getenv(SYSFS_PATH_ENV);
+ if (sysfs_path_env != NULL) {
+ safestrcpymax(mnt_path, sysfs_path_env, len);
+ return 0;
+ }
+ safestrcpymax(mnt_path, SYSFS_MNT_PATH, len);
+ }
- return ret;
+ return 0;
}
/**
* @name: where to put name
* @len: size of name
*/
-int sysfs_get_name_from_path(const unsigned char *path, unsigned char *name,
- size_t len)
+int sysfs_get_name_from_path(const char *path, char *name, size_t len)
{
- unsigned char *n = NULL;
-
- if (path == NULL || name == NULL) {
+ char tmp[SYSFS_PATH_MAX];
+ char *n = NULL;
+
+ if (!path || !name || len == 0) {
errno = EINVAL;
return -1;
}
- n = strrchr(path, '/');
+ memset(tmp, 0, SYSFS_PATH_MAX);
+ safestrcpy(tmp, path);
+ n = strrchr(tmp, '/');
if (n == NULL) {
errno = EINVAL;
return -1;
}
+ if (*(n+1) == '\0') {
+ *n = '\0';
+ n = strrchr(tmp, '/');
+ if (n == NULL) {
+ errno = EINVAL;
+ return -1;
+ }
+ }
n++;
- strncpy(name, n, len);
-
+ safestrcpymax(name, n, len);
return 0;
}
* @target: where to put name
* @len: size of name
*/
-int sysfs_get_link(const unsigned char *path, unsigned char *target, size_t len)
+int sysfs_get_link(const char *path, char *target, size_t len)
{
- unsigned char devdir[SYSFS_PATH_MAX];
- unsigned char linkpath[SYSFS_PATH_MAX];
- unsigned char *d = NULL;
+ char devdir[SYSFS_PATH_MAX];
+ char linkpath[SYSFS_PATH_MAX];
+ char temp_path[SYSFS_PATH_MAX];
+ char *d = NULL, *s = NULL;
+ int slashes = 0, count = 0;
- if (path == NULL || target == NULL) {
+ if (!path || !target || len == 0) {
errno = EINVAL;
return -1;
}
memset(devdir, 0, SYSFS_PATH_MAX);
memset(linkpath, 0, SYSFS_PATH_MAX);
+ memset(temp_path, 0, SYSFS_PATH_MAX);
+ safestrcpy(devdir, path);
- if ((sysfs_get_mnt_path(devdir, SYSFS_PATH_MAX)) != 0) {
- dprintf("Sysfs not supported on this system\n");
- return -1;
- }
-
if ((readlink(path, linkpath, SYSFS_PATH_MAX)) < 0) {
return -1;
}
-
d = linkpath;
-
- /* getting rid of leading "../.." */
- while (*d == '/' || *d == '.')
- d++;
-
- d--;
-
- strcat(devdir, d);
- strncpy(target, devdir, len);
-
+ /*
+ * Three cases here:
+ * 1. relative path => format ../..
+ * 2. absolute path => format /abcd/efgh
+ * 3. relative path _from_ this dir => format abcd/efgh
+ */
+ switch (*d) {
+ case '.':
+ /*
+ * handle the case where link is of type ./abcd/xxx
+ */
+ safestrcpy(temp_path, devdir);
+ if (*(d+1) == '/')
+ d += 2;
+ else if (*(d+1) == '.')
+ goto parse_path;
+ s = strrchr(temp_path, '/');
+ if (s != NULL) {
+ *(s+1) = '\0';
+ safestrcat(temp_path, d);
+ } else {
+ safestrcpy(temp_path, d);
+ }
+ safestrcpymax(target, temp_path, len);
+ break;
+ /*
+ * relative path, getting rid of leading "../.."
+ */
+parse_path:
+ while (*d == '/' || *d == '.') {
+ if (*d == '/')
+ slashes++;
+ d++;
+ }
+ d--;
+ s = &devdir[strlen(devdir)-1];
+ while (s != NULL && count != (slashes+1)) {
+ s--;
+ if (*s == '/')
+ count++;
+ }
+ safestrcpymax(s, d, (SYSFS_PATH_MAX-strlen(devdir)));
+ safestrcpymax(target, devdir, len);
+ break;
+ case '/':
+ /* absolute path - copy as is */
+ safestrcpymax(target, linkpath, len);
+ break;
+ default:
+ /* relative path from this directory */
+ safestrcpy(temp_path, devdir);
+ s = strrchr(temp_path, '/');
+ if (s != NULL) {
+ *(s+1) = '\0';
+ safestrcat(temp_path, linkpath);
+ } else {
+ safestrcpy(temp_path, linkpath);
+ }
+ safestrcpymax(target, temp_path, len);
+ }
return 0;
}
-
-/**
- * sysfs_del_name: free function for sysfs_open_subsystem_list
- * @name: memory area to be freed
- */
-void sysfs_del_name(void *name)
-{
- free(name);
-}
-
-
/**
* sysfs_close_list: generic list free routine
* @list: dlist to free
*/
void sysfs_close_list(struct dlist *list)
{
- if (list != NULL)
+ if (list)
dlist_destroy(list);
}
/**
- * sysfs_open_subsystem_list: gets a list of all supported "name" subsystem
- * details from the system
- * @name: name of the subsystem, eg., "bus", "class", "devices"
- * Returns a dlist of supported names or NULL if subsystem not supported
- */
-struct dlist *sysfs_open_subsystem_list(unsigned char *name)
+ * sysfs_open_directory_list: gets a list of all directories under "path"
+ * @path: path to read
+ * Returns a dlist of supported names or NULL no directories (errno is set
+ * in case of error
+ */
+struct dlist *sysfs_open_directory_list(const char *path)
{
- unsigned char sysfs_path[SYSFS_PATH_MAX], *subsys_name = NULL;
- struct sysfs_directory *dir = NULL, *cur = NULL;
- struct dlist *list = NULL;
-
- if (name == NULL)
+ if (!path)
return NULL;
- if (sysfs_get_mnt_path(sysfs_path, SYSFS_PATH_MAX) != 0) {
- dprintf("Error getting sysfs mount point\n");
- return NULL;
- }
+ return (read_dir_subdirs(path));
+}
- strcat(sysfs_path, name);
- dir = sysfs_open_directory(sysfs_path);
- if (dir == NULL) {
- dprintf("Error opening sysfs_directory at %s\n", sysfs_path);
- return NULL;
- }
+/**
+ * sysfs_path_is_dir: Check if the path supplied points to a directory
+ * @path: path to validate
+ * Returns 0 if path points to dir, 1 otherwise
+ */
+int sysfs_path_is_dir(const char *path)
+{
+ struct stat astats;
- if (sysfs_read_directory(dir) != 0) {
- dprintf("Error reading sysfs_directory at %s\n", sysfs_path);
- sysfs_close_directory(dir);
- return NULL;
+ if (!path) {
+ errno = EINVAL;
+ return 1;
}
-
- if (dir->subdirs != NULL) {
- list = dlist_new_with_delete(SYSFS_NAME_LEN,
- sysfs_del_name);
- if (list == NULL) {
- dprintf("Error creating list\n");
- sysfs_close_directory(dir);
- return NULL;
- }
-
- dlist_for_each_data(dir->subdirs, cur,
- struct sysfs_directory) {
- subsys_name = (char *)calloc(1, SYSFS_NAME_LEN);
- strcpy(subsys_name, cur->name);
- dlist_unshift(list, subsys_name);
- }
+ if ((lstat(path, &astats)) != 0) {
+ dprintf("stat() failed\n");
+ return 1;
}
- sysfs_close_directory(dir);
- return list;
-}
+ if (S_ISDIR(astats.st_mode))
+ return 0;
+ return 1;
+}
/**
- * sysfs_open_bus_devices_list: gets a list of all devices on "name" bus
- * @name: name of the subsystem, eg., "pci", "scsi", "usb"
- * Returns a dlist of supported names or NULL if subsystem not supported
- */
-struct dlist *sysfs_open_bus_devices_list(unsigned char *name)
+ * sysfs_path_is_link: Check if the path supplied points to a link
+ * @path: path to validate
+ * Returns 0 if path points to link, 1 otherwise
+ */
+int sysfs_path_is_link(const char *path)
{
- unsigned char sysfs_path[SYSFS_PATH_MAX], *device_name = NULL;
- struct sysfs_directory *dir = NULL;
- struct sysfs_link *cur = NULL;
- struct dlist *list = NULL;
-
- if (name == NULL)
- return NULL;
+ struct stat astats;
- if (sysfs_get_mnt_path(sysfs_path, SYSFS_PATH_MAX) != 0) {
- dprintf("Error getting sysfs mount point\n");
- return NULL;
+ if (!path) {
+ errno = EINVAL;
+ return 1;
}
-
- strcat(sysfs_path, SYSFS_BUS_DIR);
- strcat(sysfs_path, "/");
- strcat(sysfs_path, name);
- strcat(sysfs_path, SYSFS_DEVICES_DIR);
- dir = sysfs_open_directory(sysfs_path);
- if (dir == NULL) {
- dprintf("Error opening sysfs_directory at %s\n", sysfs_path);
- return NULL;
+ if ((lstat(path, &astats)) != 0) {
+ dprintf("stat() failed\n");
+ return 1;
}
+ if (S_ISLNK(astats.st_mode))
+ return 0;
- if (sysfs_read_directory(dir) != 0) {
- dprintf("Error reading sysfs_directory at %s\n", sysfs_path);
- sysfs_close_directory(dir);
- return NULL;
- }
+ return 1;
+}
- if (dir->links != NULL) {
- list = dlist_new_with_delete(SYSFS_NAME_LEN,
- sysfs_del_name);
- if (list == NULL) {
- dprintf("Error creating list\n");
- sysfs_close_directory(dir);
- return NULL;
- }
+/**
+ * sysfs_path_is_file: Check if the path supplied points to a file
+ * @path: path to validate
+ * Returns 0 if path points to file, 1 otherwise
+ */
+int sysfs_path_is_file(const char *path)
+{
+ struct stat astats;
- dlist_for_each_data(dir->links, cur,
- struct sysfs_link) {
- device_name = (char *)calloc(1, SYSFS_NAME_LEN);
- strcpy(device_name, cur->name);
- dlist_unshift(list, device_name);
- }
+ if (!path) {
+ errno = EINVAL;
+ return 1;
}
- sysfs_close_directory(dir);
- return list;
-}
+ if ((lstat(path, &astats)) != 0) {
+ dprintf("stat() failed\n");
+ return 1;
+ }
+ if (S_ISREG(astats.st_mode))
+ return 0;
+ return 1;
+}
~ianmdlvl / elogind.git / blobdiff