[PATCH] libsysfs changes for sysfsutils 0.3.0

[elogind.git] / libsysfs / sysfs_utils.c

diff --git a/libsysfs/sysfs_utils.c b/libsysfs/sysfs_utils.c
index 3e50bc61206622b57b384efaa343f95772d7a1c4..4e96051c780452809f087efb52bf543f3855b021 100644 (file)
--- a/libsysfs/sysfs_utils.c
+++ b/libsysfs/sysfs_utils.c
@@ -92,7 +92,7 @@ int sysfs_get_mnt_path(unsigned char *mnt_path, size_t len)
                return -1;
        }
        sysfs_path = getenv(SYSFS_PATH_ENV);
-       if (sysfs_path != NULL)
+       if (sysfs_path != NULL) 
                strncpy(mnt_path, sysfs_path, len);
        else
                ret = sysfs_get_fs_mnt_path(SYSFS_FSTYPE_NAME, mnt_path, len);
@@ -109,13 +109,19 @@ int sysfs_get_mnt_path(unsigned char *mnt_path, size_t len)
 int sysfs_get_name_from_path(const unsigned char *path, unsigned char *name, 
                                                                size_t len)
 {
+       unsigned char tmp[SYSFS_PATH_MAX];
        unsigned char *n = NULL;
                                                                                 
        if (path == NULL || name == NULL) {
                errno = EINVAL;
                return -1;
        }
-       n = strrchr(path, '/');
+       memset(tmp, 0, SYSFS_PATH_MAX);
+       strcpy(tmp, path);
+       n = &tmp[strlen(tmp)-1];
+       if (strncmp(n, "/", 1) == 0)
+               *n = '\0';      
+       n = strrchr(tmp, '/');
        if (n == NULL) {
                errno = EINVAL;
                return -1;
@@ -169,10 +175,7 @@ int sysfs_get_link(const unsigned char *path, unsigned char *target, size_t len)
                if (*s == '/')
                        count++;
        }
-
-       if (s == NULL)
-               return -1;
-
+       
        strncpy(s, d, (SYSFS_PATH_MAX-strlen(devdir)));
        strncpy(target, devdir, len);
 
@@ -184,7 +187,7 @@ int sysfs_get_link(const unsigned char *path, unsigned char *target, size_t len)
  * sysfs_del_name: free function for sysfs_open_subsystem_list
  * @name: memory area to be freed
  */ 
-void sysfs_del_name(void *name)
+static void sysfs_del_name(void *name)
 {
        free(name);
 }
@@ -210,8 +213,10 @@ void sysfs_close_list(struct dlist *list)
 struct dlist *sysfs_open_subsystem_list(unsigned char *name)
 {
        unsigned char sysfs_path[SYSFS_PATH_MAX], *subsys_name = NULL;
+       unsigned char *c = NULL;
        struct sysfs_directory *dir = NULL, *cur = NULL;
        struct dlist *list = NULL;
+       struct stat astats;
        
        if (name == NULL)
                return NULL;
@@ -251,6 +256,27 @@ struct dlist *sysfs_open_subsystem_list(unsigned char *name)
                }
        }
        sysfs_close_directory(dir);
+       /*
+        * We are now considering "block" as a "class". Hence, if the subsys
+        * name requested here is "class", verify if "block" is supported on
+        * this system and return the same.
+        */ 
+       if (strcmp(name, SYSFS_CLASS_DIR) == 0) {
+               c = strstr(sysfs_path, SYSFS_CLASS_NAME);
+               if (c == NULL)
+                       goto out;
+               strcpy(c, SYSFS_BLOCK_NAME);
+               if ((lstat(sysfs_path, &astats)) != 0) {
+                       dprintf("stat() failed\n");
+                       goto out;
+               }
+               if (S_ISDIR(astats.st_mode)) {
+                       subsys_name = (char *)calloc(1, SYSFS_NAME_LEN);
+                       strcpy(subsys_name, SYSFS_BLOCK_NAME);
+                       dlist_unshift(list, subsys_name);
+               }
+       }
+out:
        return list;
 }