/*
- * syfs_utils.c
+ * sysfs_utils.c
*
* System utility functions for libsysfs
*
- * Copyright (C) 2003 International Business Machines, Inc.
+ * Copyright (C) IBM Corp. 2003
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
#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 char *fs_type, 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(stderr, "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(stderr,
- "Error - mount path too long\n");
- ret = -1;
- }
- }
+ return 1;
}
- endmntent(mnt);
- if (dirlen == 0 && ret == 0) {
- dprintf(stderr, "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;
}
/*
*/
int sysfs_get_mnt_path(char *mnt_path, size_t len)
{
- int ret = -1;
+ static char sysfs_path[SYSFS_PATH_MAX] = "";
+ const char *sysfs_path_env;
- if (mnt_path != NULL)
- ret = sysfs_get_fs_mnt_path(SYSFS_FSTYPE_NAME, mnt_path, len);
- else
- errno = EINVAL;
+ /* 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;
}
/**
*/
int sysfs_get_name_from_path(const char *path, char *name, size_t len)
{
+ char tmp[SYSFS_PATH_MAX];
char *n = NULL;
-
- if (path == NULL || name == 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;
}
{
char devdir[SYSFS_PATH_MAX];
char linkpath[SYSFS_PATH_MAX];
- char *d = NULL;
+ 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(stderr, "Sysfs not supported on this system\n");
- return -1;
- }
-
if ((readlink(path, linkpath, SYSFS_PATH_MAX)) < 0) {
return -1;
}
-
d = linkpath;
+ /*
+ * 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;
+}
- /* getting rid of leading "../.." */
- while (*d == '/' || *d == '.')
- d++;
+/**
+ * sysfs_close_list: generic list free routine
+ * @list: dlist to free
+ * Returns nothing
+ */
+void sysfs_close_list(struct dlist *list)
+{
+ if (list)
+ dlist_destroy(list);
+}
- d--;
-
- strcat(devdir, d);
- strncpy(target, devdir, len);
+/**
+ * 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)
+{
+ if (!path)
+ return NULL;
- return 0;
+ return (read_dir_subdirs(path));
+}
+
+/**
+ * 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 (!path) {
+ errno = EINVAL;
+ return 1;
+ }
+ if ((lstat(path, &astats)) != 0) {
+ dprintf("stat() failed\n");
+ return 1;
+ }
+ if (S_ISDIR(astats.st_mode))
+ return 0;
+
+ return 1;
+}
+
+/**
+ * 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)
+{
+ struct stat astats;
+
+ if (!path) {
+ errno = EINVAL;
+ return 1;
+ }
+ if ((lstat(path, &astats)) != 0) {
+ dprintf("stat() failed\n");
+ return 1;
+ }
+ if (S_ISLNK(astats.st_mode))
+ return 0;
+
+ return 1;
+}
+
+/**
+ * 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;
+
+ if (!path) {
+ errno = EINVAL;
+ return 1;
+ }
+ 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