*
* 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 "libsysfs.h"
#include "sysfs.h"
+#ifndef __KLIBC__
+#include <mntent.h>
+#endif
/**
* sysfs_get_mnt_path: Gets the mount point for specified filesystem.
* @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)
+static int sysfs_get_fs_mnt_path(const unsigned char *fs_type,
+ unsigned char *mnt_path, size_t len)
{
+#ifdef __KLIBC__
+ strcpy(mnt_path, "/sys");
+ return 0;
+#else
FILE *mnt;
struct mntent *mntent;
int ret = 0;
}
if ((mnt = setmntent(SYSFS_PROC_MNTS, "r")) == NULL) {
- dprintf(stderr, "Error getting mount information\n");
+ dprintf("Error getting mount information\n");
return -1;
}
while (ret == 0 && dirlen == 0 && (mntent = getmntent(mnt)) != NULL) {
if (dirlen <= (len - 1)) {
strcpy(mnt_path, mntent->mnt_dir);
} else {
- dprintf(stderr,
- "Error - mount path too long\n");
+ dprintf("Error - mount path too long\n");
ret = -1;
}
}
}
endmntent(mnt);
if (dirlen == 0 && ret == 0) {
- dprintf(stderr, "Filesystem %s not found!\n", fs_type);
+ dprintf("Filesystem %s not found!\n", fs_type);
errno = EINVAL;
ret = -1;
}
return ret;
+#endif
}
/*
* @len: size of mnt_path
* returns 0 with success and -1 with error.
*/
-int sysfs_get_mnt_path(char *mnt_path, size_t len)
+int sysfs_get_mnt_path(unsigned char *mnt_path, size_t len)
{
- int ret = -1;
+ char *sysfs_path = NULL;
+ int ret = 0;
- if (mnt_path != NULL)
- ret = sysfs_get_fs_mnt_path(SYSFS_FSTYPE_NAME, mnt_path, len);
- else
+ if (mnt_path == NULL) {
errno = EINVAL;
+ return -1;
+ }
+ sysfs_path = getenv(SYSFS_PATH_ENV);
+ if (sysfs_path != NULL)
+ strncpy(mnt_path, sysfs_path, len);
+ else
+ ret = sysfs_get_fs_mnt_path(SYSFS_FSTYPE_NAME, mnt_path, len);
return ret;
}
* @name: where to put name
* @len: size of name
*/
-int sysfs_get_name_from_path(const char *path, char *name, size_t len)
+int sysfs_get_name_from_path(const unsigned char *path, unsigned char *name,
+ size_t len)
{
- char *n = NULL;
+ 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;
* @target: where to put name
* @len: size of name
*/
-int sysfs_get_link(const char *path, char *target, size_t len)
+int sysfs_get_link(const unsigned char *path, unsigned char *target, size_t len)
{
- char devdir[SYSFS_PATH_MAX];
- char linkpath[SYSFS_PATH_MAX];
- char *d = NULL;
+ unsigned char devdir[SYSFS_PATH_MAX];
+ unsigned char linkpath[SYSFS_PATH_MAX];
+ unsigned char *d = NULL, *s = NULL;
+ int slashes = 0, count = 0;
if (path == NULL || target == NULL) {
errno = EINVAL;
memset(devdir, 0, SYSFS_PATH_MAX);
memset(linkpath, 0, SYSFS_PATH_MAX);
+ strncpy(devdir, path, SYSFS_PATH_MAX);
- 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;
/* getting rid of leading "../.." */
- while (*d == '/' || *d == '.')
+ while (*d == '/' || *d == '.') {
+ if (*d == '/')
+ slashes++;
d++;
+ }
d--;
+
+ s = &devdir[strlen(devdir)-1];
+ while (s != NULL && count != (slashes+1)) {
+ s--;
+ if (*s == '/')
+ count++;
+ }
- strcat(devdir, d);
+ strncpy(s, d, (SYSFS_PATH_MAX-strlen(devdir)));
strncpy(target, devdir, len);
return 0;
}
+
+
+/**
+ * sysfs_del_name: free function for sysfs_open_subsystem_list
+ * @name: memory area to be freed
+ */
+static void sysfs_del_name(void *name)
+{
+ free(name);
+}
+
+
+/**
+ * sysfs_close_list: generic list free routine
+ * @list: dlist to free
+ * Returns nothing
+ */
+void sysfs_close_list(struct dlist *list)
+{
+ if (list != NULL)
+ 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)
+{
+ 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;
+
+ if (sysfs_get_mnt_path(sysfs_path, SYSFS_PATH_MAX) != 0) {
+ dprintf("Error getting sysfs mount point\n");
+ return NULL;
+ }
+
+ 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;
+ }
+
+ if (sysfs_read_directory(dir) != 0) {
+ dprintf("Error reading sysfs_directory at %s\n", sysfs_path);
+ sysfs_close_directory(dir);
+ return NULL;
+ }
+
+ 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);
+ }
+ }
+ 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;
+}
+
+
+/**
+ * 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)
+{
+ 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;
+
+ if (sysfs_get_mnt_path(sysfs_path, SYSFS_PATH_MAX) != 0) {
+ dprintf("Error getting sysfs mount point\n");
+ return NULL;
+ }
+
+ 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 (sysfs_read_directory(dir) != 0) {
+ dprintf("Error reading sysfs_directory at %s\n", sysfs_path);
+ sysfs_close_directory(dir);
+ return NULL;
+ }
+
+ 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;
+ }
+
+ 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);
+ }
+ }
+ sysfs_close_directory(dir);
+ return list;
+}
+
~ianmdlvl / elogind.git / blobdiff