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/*
* libsysfs.h
*
* Header Definitions for libsysfs
*
* 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
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#ifndef _LIBSYSFS_H_
#define _LIBSYSFS_H_
#include <sys/types.h>
#include <string.h>
#include "dlist.h"
/*
* Defines to prevent buffer overruns
*/
#define safestrcpy(to, from) strncpy(to, from, sizeof(to)-1)
#define safestrcat(to, from) strncat(to, from, sizeof(to) - strlen(to)-1)
#define safestrcpymax(to, from, max) \
do { \
to[max-1] = '\0'; \
strncpy(to, from, max-1); \
} while (0)
#define safestrcatmax(to, from, max) \
do { \
to[max-1] = '\0'; \
strncat(to, from, max - strlen(to)-1); \
} while (0)
/*
* Generic #defines go here..
*/
#define SYSFS_FSTYPE_NAME "sysfs"
#define SYSFS_PROC_MNTS "/proc/mounts"
#define SYSFS_BUS_NAME "bus"
#define SYSFS_CLASS_NAME "class"
#define SYSFS_BLOCK_NAME "block"
#define SYSFS_DEVICES_NAME "devices"
#define SYSFS_DRIVERS_NAME "drivers"
#define SYSFS_NAME_ATTRIBUTE "name"
#define SYSFS_UNKNOWN "unknown"
#define SYSFS_PATH_ENV "SYSFS_PATH"
#define SYSFS_PATH_MAX 255
#define SYSFS_NAME_LEN 50
#define SYSFS_BUS_ID_SIZE 20
#define SYSFS_METHOD_SHOW 0x01 /* attr can be read by user */
#define SYSFS_METHOD_STORE 0x02 /* attr can be changed by user */
/*
* NOTE: We have the statically allocated "name" as the first element of all
* the structures. This feature is used in the "sorter" function for dlists
*/
struct sysfs_attribute {
char name[SYSFS_NAME_LEN];
char path[SYSFS_PATH_MAX];
char *value;
unsigned short len; /* value length */
unsigned short method; /* show and store */
};
struct sysfs_link {
char name[SYSFS_NAME_LEN];
char path[SYSFS_PATH_MAX];
char target[SYSFS_PATH_MAX];
};
struct sysfs_directory {
char name[SYSFS_NAME_LEN];
char path[SYSFS_PATH_MAX];
/* Private: for internal use only */
struct dlist *subdirs;
struct dlist *links;
struct dlist *attributes;
};
struct sysfs_driver {
char name[SYSFS_NAME_LEN];
char path[SYSFS_PATH_MAX];
/* Private: for internal use only */
struct dlist *devices;
struct sysfs_directory *directory;
};
struct sysfs_device {
char name[SYSFS_NAME_LEN];
char bus_id[SYSFS_NAME_LEN];
char bus[SYSFS_NAME_LEN];
char driver_name[SYSFS_NAME_LEN];
char path[SYSFS_PATH_MAX];
/* Private: for internal use only */
struct sysfs_device *parent;
struct dlist *children;
struct sysfs_directory *directory;
};
struct sysfs_root_device {
char name[SYSFS_NAME_LEN];
char path[SYSFS_PATH_MAX];
/* Private: for internal use only */
struct dlist *devices;
struct sysfs_directory *directory;
};
struct sysfs_bus {
char name[SYSFS_NAME_LEN];
char path[SYSFS_PATH_MAX];
/* Private: for internal use only */
struct dlist *drivers;
struct dlist *devices;
struct sysfs_directory *directory;
};
struct sysfs_class_device {
char name[SYSFS_NAME_LEN];
char classname[SYSFS_NAME_LEN];
char path[SYSFS_PATH_MAX];
/* Private: for internal use only */
struct sysfs_class_device *parent;
struct sysfs_device *sysdevice; /* NULL if virtual */
struct sysfs_driver *driver; /* NULL if not implemented */
struct sysfs_directory *directory;
};
struct sysfs_class {
char name[SYSFS_NAME_LEN];
char path[SYSFS_PATH_MAX];
/* Private: for internal use only */
struct dlist *devices;
struct sysfs_directory *directory;
};
#ifdef __cplusplus
extern "C" {
#endif
/*
* Function Prototypes
*/
extern int sysfs_get_mnt_path(char *mnt_path, size_t len);
extern int sysfs_remove_trailing_slash(char *path);
extern int sysfs_get_name_from_path(const char *path, char *name, size_t len);
extern int sysfs_path_is_dir(const char *path);
extern int sysfs_path_is_link(const char *path);
extern int sysfs_path_is_file(const char *path);
extern int sysfs_get_link(const char *path, char *target, size_t len);
extern struct dlist *sysfs_open_subsystem_list(char *name);
extern struct dlist *sysfs_open_bus_devices_list(char *name);
extern void sysfs_close_list(struct dlist *list);
/* sysfs directory and file access */
extern void sysfs_close_attribute(struct sysfs_attribute *sysattr);
extern struct sysfs_attribute *sysfs_open_attribute(const char *path);
extern int sysfs_read_attribute(struct sysfs_attribute *sysattr);
extern int sysfs_read_attribute_value(const char *attrpath,
char *value, size_t vsize);
extern int sysfs_write_attribute(struct sysfs_attribute *sysattr,
const char *new_value, size_t len);
extern char *sysfs_get_value_from_attributes(struct dlist *attr,
const char *name);
extern int sysfs_refresh_dir_attributes(struct sysfs_directory *sysdir);
extern int sysfs_refresh_dir_links(struct sysfs_directory *sysdir);
extern int sysfs_refresh_dir_subdirs(struct sysfs_directory *sysdir);
extern void sysfs_close_directory(struct sysfs_directory *sysdir);
extern struct sysfs_directory *sysfs_open_directory(const char *path);
extern int sysfs_read_dir_attributes(struct sysfs_directory *sysdir);
extern int sysfs_read_dir_links(struct sysfs_directory *sysdir);
extern int sysfs_read_dir_subdirs(struct sysfs_directory *sysdir);
extern int sysfs_read_directory(struct sysfs_directory *sysdir);
extern int sysfs_read_all_subdirs(struct sysfs_directory *sysdir);
extern struct sysfs_directory *sysfs_get_subdirectory
(struct sysfs_directory *dir, char *subname);
extern void sysfs_close_link(struct sysfs_link *ln);
extern struct sysfs_link *sysfs_open_link(const char *lnpath);
extern struct sysfs_link *sysfs_get_directory_link
(struct sysfs_directory *dir, char *linkname);
extern struct sysfs_link *sysfs_get_subdirectory_link
(struct sysfs_directory *dir, char *linkname);
extern struct sysfs_attribute *sysfs_get_directory_attribute
(struct sysfs_directory *dir, char *attrname);
extern struct dlist *sysfs_get_dir_attributes(struct sysfs_directory *dir);
extern struct dlist *sysfs_get_dir_links(struct sysfs_directory *dir);
extern struct dlist *sysfs_get_dir_subdirs(struct sysfs_directory *dir);
/* sysfs driver access */
extern void sysfs_close_driver(struct sysfs_driver *driver);
extern struct sysfs_driver *sysfs_open_driver
(const char *bus_name, const char *drv_name);
extern struct sysfs_driver *sysfs_open_driver_path(const char *path);
extern struct sysfs_attribute *sysfs_get_driver_attr
(struct sysfs_driver *drv, const char *name);
extern struct dlist *sysfs_get_driver_attributes(struct sysfs_driver *driver);
extern struct dlist *sysfs_get_driver_devices(struct sysfs_driver *driver);
extern struct dlist *sysfs_refresh_driver_devices(struct sysfs_driver *driver);
extern struct dlist *sysfs_get_driver_links(struct sysfs_driver *driver);
extern struct sysfs_device *sysfs_get_driver_device
(struct sysfs_driver *driver, const char *name);
extern struct dlist *sysfs_refresh_driver_attributes
(struct sysfs_driver *driver);
extern struct sysfs_attribute *sysfs_open_driver_attr
(const char *bus, const char *drv, const char *attrib);
/* generic sysfs device access */
extern void sysfs_close_root_device(struct sysfs_root_device *root);
extern struct sysfs_root_device *sysfs_open_root_device(const char *name);
extern struct dlist *sysfs_get_root_devices(struct sysfs_root_device *root);
extern void sysfs_close_device_tree(struct sysfs_device *device);
extern struct sysfs_device *sysfs_open_device_tree(const char *path);
extern void sysfs_close_device(struct sysfs_device *dev);
extern struct sysfs_device *sysfs_open_device
(const char *bus, const char *bus_id);
extern struct sysfs_device *sysfs_get_device_parent(struct sysfs_device *dev);
extern struct sysfs_device *sysfs_open_device_path(const char *path);
extern int sysfs_get_device_bus(struct sysfs_device *dev);
extern struct sysfs_attribute *sysfs_get_device_attr
(struct sysfs_device *dev, const char *name);
extern struct dlist *sysfs_get_device_attributes(struct sysfs_device *device);
extern struct dlist *sysfs_refresh_device_attributes
(struct sysfs_device *device);
extern struct sysfs_attribute *sysfs_open_device_attr(const char *bus,
const char *bus_id, const char *attrib);
/* generic sysfs bus access */
extern void sysfs_close_bus(struct sysfs_bus *bus);
extern struct sysfs_bus *sysfs_open_bus(const char *name);
extern struct sysfs_device *sysfs_get_bus_device(struct sysfs_bus *bus,
char *id);
extern struct sysfs_driver *sysfs_get_bus_driver(struct sysfs_bus *bus,
char *drvname);
extern struct dlist *sysfs_get_bus_drivers(struct sysfs_bus *bus);
extern struct dlist *sysfs_get_bus_devices(struct sysfs_bus *bus);
extern struct dlist *sysfs_get_bus_attributes(struct sysfs_bus *bus);
extern struct dlist *sysfs_refresh_bus_attributes(struct sysfs_bus *bus);
extern struct sysfs_attribute *sysfs_get_bus_attribute
(struct sysfs_bus *bus, char *attrname);
extern int sysfs_find_driver_bus(const char *driver, char *busname,
size_t bsize);
/* generic sysfs class access */
extern void sysfs_close_class_device(struct sysfs_class_device *dev);
extern struct sysfs_class_device *sysfs_open_class_device_path
(const char *path);
extern struct sysfs_class_device *sysfs_open_class_device
(const char *classname, const char *name);
extern struct sysfs_device *sysfs_get_classdev_device
(struct sysfs_class_device *clsdev);
extern struct sysfs_driver *sysfs_get_classdev_driver
(struct sysfs_class_device *clsdev);
extern struct sysfs_class_device *sysfs_get_classdev_parent
(struct sysfs_class_device *clsdev);
extern void sysfs_close_class(struct sysfs_class *cls);
extern struct sysfs_class *sysfs_open_class(const char *name);
extern struct dlist *sysfs_get_class_devices(struct sysfs_class *cls);
extern struct sysfs_class_device *sysfs_get_class_device
(struct sysfs_class *cls, char *name);
extern struct dlist *sysfs_get_classdev_attributes
(struct sysfs_class_device *cdev);
extern struct dlist *sysfs_refresh_classdev_attributes
(struct sysfs_class_device *cdev);
extern struct sysfs_attribute *sysfs_get_classdev_attr
(struct sysfs_class_device *clsdev, const char *name);
extern struct sysfs_attribute *sysfs_open_classdev_attr
(const char *classname, const char *dev,
const char *attrib);
/**
* sort_list: sorter function to keep list elements sorted in alphabetical
* order. Just does a strncmp as you can see :)
*
* Returns 1 if less than 0 otherwise
*
* NOTE: We take care to have a statically allocated "name" as the first
* lement of all libsysfs structures. Hence, this function will work
* AS IS for _ALL_ the lists that have to be sorted.
*/
static inline int sort_list(void *new_elem, void *old_elem)
{
return ((strncmp(((struct sysfs_attribute *)new_elem)->name,
((struct sysfs_attribute *)old_elem)->name,
strlen(((struct sysfs_attribute *)new_elem)->name))) < 0 ? 1 : 0);
}
#ifdef __cplusplus
}
#endif
#endif /* _LIBSYSFS_H_ */
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