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[PATCH] added libsysfs code from sysutils-0.1.1-071803 release

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greg@kroah.com 2003-07-18 20:08:00 -07:00 committed by Greg KH
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GNU Lesser Public License
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# Makefile for libsysfs.a
# Copyright (c) International Business Machines Corp., 2003
CC=gcc
H_INCLUDE=../include
LIB_INCLUDE=.
OBJS=sysfs_bus.o sysfs_class.o sysfs_device.o sysfs_dir.o sysfs_driver.o \
sysfs_utils.o
# Install directory
# Options
CFLAGS=-O2 -Wall -ansi -g
# sysfs library
LIBSYSFS=libsysfs.a
RM=rm -f
libsysfs.a: $(OBJS)
ar cru $(LIBSYSFS) $(OBJS)
ranlib $(LIBSYSFS)
sysfs_bus.o: sysfs_bus.c
$(CC) -I$(H_INCLUDE) -I$(LIB_INCLUDE) $(CFLAGS) -c sysfs_bus.c
sysfs_class.o: sysfs_class.c
$(CC) -I$(H_INCLUDE) -I$(LIB_INCLUDE) $(CFLAGS) -c sysfs_class.c
sysfs_device.o: sysfs_device.c
$(CC) -I$(H_INCLUDE) -I$(LIB_INCLUDE) $(CFLAGS) -c sysfs_device.c
sysfs_dir.o: sysfs_dir.c
$(CC) -I$(H_INCLUDE) -I$(LIB_INCLUDE) $(CFLAGS) -c sysfs_dir.c
sysfs_driver.o: sysfs_driver.c
$(CC) -I$(H_INCLUDE) -I$(LIB_INCLUDE) $(CFLAGS) -c sysfs_driver.c
sysfs_utils.o: sysfs_utils.c
$(CC) -I$(H_INCLUDE) -I$(LIB_INCLUDE) $(CFLAGS) -c sysfs_utils.c
clean:
$(RM) *.o *~ core $(LIBSYSFS)

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/*
* libsysfs.h
*
* Header Definitions for libsysfs
*
* Copyright (C) 2003 International Business Machines, Inc.
*
* 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>
/*
* Generic #defines go here..
*/
#define SYSFS_FSTYPE_NAME "sysfs"
#define SYSFS_PROC_MNTS "/proc/mounts"
#define SYSFS_BUS_DIR "/bus"
#define SYSFS_CLASS_DIR "/class"
#define SYSFS_DEVICES_DIR "/devices"
#define SYSFS_DEVICES_NAME "devices"
#define SYSFS_DRIVERS_DIR "/drivers"
#define SYSFS_DRIVERS_NAME "drivers"
#define SYSFS_NAME_ATTRIBUTE "name"
#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 */
struct sysfs_attribute {
struct sysfs_attribute *next;
char path[SYSFS_PATH_MAX];
char *value;
unsigned short len; /* value length */
unsigned short method; /* show and store */
};
struct sysfs_dlink {
struct sysfs_dlink *next;
char name[SYSFS_NAME_LEN];
struct sysfs_directory *target;
};
struct sysfs_directory {
struct sysfs_directory *next;
char path[SYSFS_PATH_MAX];
struct sysfs_directory *subdirs;
struct sysfs_dlink *links;
struct sysfs_attribute *attributes;
};
struct sysfs_driver {
struct sysfs_driver *next;
char name[SYSFS_NAME_LEN];
struct sysfs_directory *directory;
struct sysfs_device *device;
};
struct sysfs_device {
struct sysfs_device *next;
char name[SYSFS_NAME_LEN];
char bus_id[SYSFS_NAME_LEN];
struct sysfs_driver *driver;
struct sysfs_directory *directory;
struct sysfs_device *parent;
struct sysfs_device *children;
};
struct sysfs_bus {
struct sysfs_bus *next;
char name[SYSFS_NAME_LEN];
struct sysfs_directory *directory;
struct sysfs_driver *drivers;
struct sysfs_device *devices;
};
struct sysfs_class_device {
struct sysfs_class_device *next;
char name[SYSFS_NAME_LEN];
struct sysfs_directory *directory;
struct sysfs_device *sysdevice; /* NULL if virtual */
struct sysfs_driver *driver; /* NULL if not implemented */
};
struct sysfs_class {
struct sysfs_class *next;
char name[SYSFS_NAME_LEN];
struct sysfs_directory *directory;
struct sysfs_class_device *devices;
};
#ifdef __cplusplus
extern "C" {
#endif
/*
* Function Prototypes
*/
extern int sysfs_get_mnt_path(char *mnt_path, size_t len);
extern int sysfs_get_name_from_path(const char *path, char *name, size_t len);
extern int sysfs_get_link(const char *path, char *target, size_t len);
/* 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 char *sysfs_get_value_from_attributes(struct sysfs_attribute *attr,
const char * name);
extern void sysfs_close_directory(struct sysfs_directory *sysdir);
extern struct sysfs_directory *sysfs_open_directory(const char *path);
extern int sysfs_read_directory(struct sysfs_directory *sysdir);
extern void sysfs_close_dlink(struct sysfs_dlink *dlink);
extern struct sysfs_dlink *sysfs_open_dlink(const char *linkpath);
extern int sysfs_read_dlinks(struct sysfs_dlink *dlink);
/* sysfs driver access */
extern void sysfs_close_driver(struct sysfs_driver *driver);
extern struct sysfs_driver *sysfs_open_driver(const char *path);
/* generic sysfs device access */
extern void sysfs_close_device(struct sysfs_device *dev);
extern void sysfs_close_device_tree(struct sysfs_device *dev);
extern struct sysfs_device *sysfs_open_device(const char *path);
extern struct sysfs_device *sysfs_open_device_tree(const char *path);
extern struct sysfs_attribute *sysfs_get_device_attr
(struct sysfs_device *dev, const char *name);
/* generic sysfs bus access */
extern void sysfs_close_bus(struct sysfs_bus *bus);
extern struct sysfs_bus *sysfs_open_bus(const char *name);
/* generic sysfs class access */
extern void sysfs_close_class_device(struct sysfs_class_device *dev);
extern struct sysfs_class_device *sysfs_open_class_device(const char *path);
extern void sysfs_close_class(struct sysfs_class *cls);
extern struct sysfs_class *sysfs_open_class(const char *name);
#ifdef __cplusplus
}
#endif
#endif /* _LIBSYSFS_H_ */

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/*
* sysfs.h
*
* Internal Header Definitions for libsysfs
*
* Copyright (C) 2003 International Business Machines, Inc.
*
* 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 _SYSFS_H_
#define _SYSFS_H_
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <mntent.h>
#include <dirent.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
/* external library functions */
extern int lstat(const char *file_name, struct stat *buf);
extern int readlink(const char *path, char *buf, size_t bufsize);
extern int getpagesize(void);
extern int isascii(int c);
/* Debugging */
#ifdef DEBUG
#define dprintf(format, arg...) fprintf(stderr, format, ## arg)
#else
#define dprintf(format, arg...) do { } while (0)
#endif
#endif /* _SYSFS_H_ */

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/*
* sysfs_bus.c
*
* Generic bus utility functions for libsysfs
*
* Copyright (C) 2003 International Business Machines, Inc.
*
* 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
*
*/
#include "libsysfs.h"
#include "sysfs.h"
/**
* sysfs_close_bus: close single bus
* @bus: bus structure
*/
void sysfs_close_bus(struct sysfs_bus *bus)
{
struct sysfs_device *curdev = NULL, *nextdev = NULL;
struct sysfs_driver *curdrv = NULL, *nextdrv = NULL;
if (bus != NULL) {
if (bus->directory != NULL)
sysfs_close_directory(bus->directory);
for (curdev = bus->devices; curdev != NULL;
curdev = nextdev) {
nextdev = curdev->next;
sysfs_close_device(curdev);
}
for (curdrv = bus->drivers; curdrv != NULL;
curdrv = nextdrv) {
nextdrv = curdrv->next;
sysfs_close_driver(curdrv);
}
free(bus);
}
}
/**
* alloc_bus: mallocs new bus structure
* returns sysfs_bus_bus struct or NULL
*/
static struct sysfs_bus *alloc_bus(void)
{
return (struct sysfs_bus *)calloc(1, sizeof(struct sysfs_bus));
}
/**
* open_bus_dir: opens up sysfs bus directory
* returns sysfs_directory struct with success and NULL with error
*/
static struct sysfs_directory *open_bus_dir(const char *name)
{
struct sysfs_directory *busdir = NULL, *cur = NULL, *next = NULL;
char buspath[SYSFS_PATH_MAX];
if (name == NULL) {
errno = EINVAL;
return NULL;
}
memset(buspath, 0, SYSFS_PATH_MAX);
if ((sysfs_get_mnt_path(buspath, SYSFS_PATH_MAX)) != 0) {
dprintf(stderr, "Sysfs not supported on this system\n");
return NULL;
}
strcat(buspath, SYSFS_BUS_DIR);
strcat(buspath, "/");
strcat(buspath, name);
busdir = sysfs_open_directory(buspath);
if (busdir == NULL) {
errno = EINVAL;
dprintf(stderr,"Bus %s not supported on this system\n",
name);
return NULL;
}
if ((sysfs_read_directory(busdir)) != 0) {
dprintf(stderr, "Error reading %s bus dir %s\n", name,
buspath);
sysfs_close_directory(busdir);
return NULL;
}
/* read in devices and drivers subdirs */
for (cur = busdir->subdirs; cur != NULL; cur = next) {
next = cur->next;
if ((sysfs_read_directory(cur)) != 0)
continue;
}
return busdir;
}
/**
* add_dev_to_bus: adds a bus device to bus device list
* @bus: bus to add the device
* @dev: device to add
*/
static void add_dev_to_bus(struct sysfs_bus *bus, struct sysfs_device *dev)
{
if (bus != NULL && dev != NULL) {
dev->next = bus->devices;
bus->devices = dev;
}
}
/**
* add_driver_to_bus: adds a bus driver to bus driver list
* @bus: bus to add driver to
* @driver: driver to add
*/
static void add_driver_to_bus(struct sysfs_bus *bus,
struct sysfs_driver *driver)
{
if (bus != NULL && driver != NULL) {
driver->next = bus->drivers;
bus->drivers = driver;
}
}
/**
* get_all_bus_devices: gets all devices for bus
* @bus: bus to get devices for
* returns 0 with success and -1 with failure
*/
static int get_all_bus_devices(struct sysfs_bus *bus)
{
struct sysfs_device *bdev = NULL;
struct sysfs_directory *cur = NULL;
struct sysfs_dlink *curl = NULL, *nextl = NULL;
char dirname[SYSFS_NAME_LEN];
if (bus == NULL || bus->directory == NULL) {
errno = EINVAL;
return -1;
}
for (cur = bus->directory->subdirs; cur != NULL; cur = cur->next) {
memset(dirname, 0, SYSFS_NAME_LEN);
if ((sysfs_get_name_from_path(cur->path, dirname,
SYSFS_NAME_LEN)) != 0)
continue;
if (strcmp(dirname, SYSFS_DEVICES_NAME) != 0)
continue;
for (curl = cur->links; curl != NULL; curl = nextl) {
nextl = curl->next;
bdev = sysfs_open_device(curl->target->path);
if (bdev == NULL) {
dprintf(stderr, "Error opening device at %s\n",
curl->target->path);
continue;
}
add_dev_to_bus(bus, bdev);
}
}
return 0;
}
/**
* get_all_bus_drivers: get all pci drivers
* @bus: pci bus to add drivers to
* returns 0 with success and -1 with error
*/
static int get_all_bus_drivers(struct sysfs_bus *bus)
{
struct sysfs_driver *driver = NULL;
struct sysfs_directory *cur = NULL, *next = NULL;
struct sysfs_directory *cursub = NULL, *nextsub = NULL;
char dirname[SYSFS_NAME_LEN];
if (bus == NULL || bus->directory == NULL) {
errno = EINVAL;
return -1;
}
for (cur = bus->directory->subdirs; cur != NULL; cur = next) {
next = cur->next;
memset(dirname, 0, SYSFS_NAME_LEN);
if ((sysfs_get_name_from_path(cur->path, dirname,
SYSFS_NAME_LEN)) != 0)
continue;
if (strcmp(dirname, SYSFS_DRIVERS_NAME) != 0)
continue;
for (cursub = cur->subdirs; cursub != NULL; cursub = nextsub) {
nextsub = cursub->next;
driver = sysfs_open_driver(cursub->path);
if (driver == NULL) {
dprintf(stderr, "Error opening driver at %s\n",
cursub->path);
continue;
}
add_driver_to_bus(bus, driver);
}
}
return 0;
}
/**
* match_bus_device_to_driver: returns 1 if device is bound to driver
* @driver: driver to match
* @busid: busid of device to match
* returns 1 if found and 0 if not found
*/
static int match_bus_device_to_driver(struct sysfs_driver *driver, char *busid)
{
struct sysfs_dlink *cur = NULL, *next = NULL;
int found = 0;
if (driver == NULL || driver->directory == NULL || busid == NULL) {
errno = EINVAL;
return found;
}
for (cur = driver->directory->links; cur != NULL && found == 0;
cur = next) {
next = cur->next;
if ((strcmp(cur->name, busid)) == 0)
found++;
}
return found;
}
/**
* link_bus_devices_to_drivers: goes through and links devices to drivers
* @bus: bus to link
*/
static void link_bus_devices_to_drivers(struct sysfs_bus *bus)
{
struct sysfs_device *dev = NULL, *nextdev = NULL;
struct sysfs_driver *drv = NULL, *nextdrv = NULL;
if (bus != NULL && bus->devices != NULL && bus->drivers != NULL) {
for (dev = bus->devices; dev != NULL; dev = nextdev) {
nextdev = dev->next;
for (drv = bus->drivers; drv != NULL; drv = nextdrv) {
nextdrv = drv->next;
if ((match_bus_device_to_driver(drv,
dev->bus_id)) != 0) {
dev->driver = drv;
drv->device = dev;
}
}
}
}
}
/**
* sysfs_open_bus: opens specific bus and all its devices on system
* returns sysfs_bus structure with success or NULL with error.
*/
struct sysfs_bus *sysfs_open_bus(const char *name)
{
struct sysfs_bus *bus = NULL;
struct sysfs_directory *busdir = NULL;
if (name == NULL) {
errno = EINVAL;
return NULL;
}
bus = alloc_bus();
if (bus == NULL) {
perror("malloc");
return NULL;
}
strcpy(bus->name, name);
busdir = open_bus_dir(name);
if (busdir == NULL) {
dprintf(stderr,"Invalid bus, %s not supported on this system\n",
name);
sysfs_close_bus(bus);
return NULL;
}
bus->directory = busdir;
if ((get_all_bus_devices(bus)) != 0) {
dprintf(stderr, "Error reading %s bus devices\n", name);
sysfs_close_bus(bus);
return NULL;
}
if ((get_all_bus_drivers(bus)) != 0) {
dprintf(stderr, "Error reading %s bus drivers\n", name);
sysfs_close_bus(bus);
return NULL;
}
link_bus_devices_to_drivers(bus);
return bus;
}

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/*
* sysfs_class.c
*
* Generic class utility functions for libsysfs
*
* Copyright (C) 2003 International Business Machines, Inc.
*
* 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
*
*/
#include "libsysfs.h"
#include "sysfs.h"
/**
* sysfs_close_class_device: closes a single class device.
* @dev: class device to close.
*/
void sysfs_close_class_device(struct sysfs_class_device *dev)
{
if (dev != NULL) {
if (dev->directory != NULL)
sysfs_close_directory(dev->directory);
if (dev->sysdevice != NULL)
sysfs_close_device(dev->sysdevice);
if (dev->driver != NULL)
sysfs_close_driver(dev->driver);
free(dev);
}
}
/**
* sysfs_close_class: close single class
* @class: class structure
*/
void sysfs_close_class(struct sysfs_class *cls)
{
struct sysfs_class_device *cur = NULL, *next = NULL;
if (cls != NULL) {
if (cls->directory != NULL)
sysfs_close_directory(cls->directory);
for (cur = cls->devices; cur != NULL; cur = next) {
next = cur->next;
sysfs_close_class_device(cur);
}
free(cls);
}
}
/**
* alloc_class_device: mallocs and initializes new class device struct.
* returns sysfs_class_device or NULL.
*/
static struct sysfs_class_device *alloc_class_device(void)
{
return (struct sysfs_class_device *)
calloc(1, sizeof(struct sysfs_class_device));
}
/**
* alloc_class: mallocs new class structure
* returns sysfs_class struct or NULL
*/
static struct sysfs_class *alloc_class(void)
{
return (struct sysfs_class *)calloc(1, sizeof(struct sysfs_class));
}
/**
* open_class_dir: opens up sysfs class directory
* returns sysfs_directory struct with success and NULL with error
*/
static struct sysfs_directory *open_class_dir(const char *name)
{
struct sysfs_directory *classdir = NULL;
char classpath[SYSFS_PATH_MAX];
if (name == NULL) {
errno = EINVAL;
return NULL;
}
memset(classpath, 0, SYSFS_PATH_MAX);
if ((sysfs_get_mnt_path(classpath, SYSFS_PATH_MAX)) != 0) {
dprintf(stderr, "Sysfs not supported on this system\n");
return NULL;
}
strcat(classpath, SYSFS_CLASS_DIR);
strcat(classpath, "/");
strcat(classpath, name);
classdir = sysfs_open_directory(classpath);
if (classdir == NULL) {
errno = EINVAL;
dprintf(stderr,"Class %s not supported on this system\n",
name);
return NULL;
}
if ((sysfs_read_directory(classdir)) != 0) {
dprintf(stderr, "Error reading %s class dir %s\n", name,
classpath);
sysfs_close_directory(classdir);
return NULL;
}
return classdir;
}
/**
* sysfs_open_class_device: Opens and populates class device
* @path: path to class device.
* returns struct sysfs_class_device with success and NULL with error.
*/
struct sysfs_class_device *sysfs_open_class_device(const char *path)
{
struct sysfs_class_device *cdev = NULL;
struct sysfs_directory *dir = NULL, *cur = NULL;
struct sysfs_dlink *curl = NULL;
struct sysfs_device *sdev = NULL;
struct sysfs_driver *drv = NULL;
char temp[SYSFS_NAME_LEN];
if (path == NULL) {
errno = EINVAL;
return NULL;
}
cdev = alloc_class_device();
if (cdev == NULL) {
perror("malloc");
return NULL;
}
memset(temp, 0, SYSFS_NAME_LEN);
if ((sysfs_get_name_from_path(path, temp, SYSFS_NAME_LEN)) != 0) {
errno = EINVAL;
dprintf(stderr, "Invalid class device path %s\n", path);
sysfs_close_class_device(cdev);
return NULL;
}
strcpy(cdev->name, temp);
dir = sysfs_open_directory(path);
if (dir == NULL) {
dprintf(stderr, "Error opening class device at %s\n", path);
sysfs_close_class_device(cdev);
return NULL;
}
if ((sysfs_read_directory(dir)) != 0) {
dprintf(stderr, "Error reading class device at %s\n", path);
sysfs_close_directory(dir);
sysfs_close_class_device(cdev);
return NULL;
}
cdev->directory = dir;
cur = cdev->directory->subdirs;
while(cur != NULL) {
sysfs_read_directory(cur);
cur = cur->next;
}
/* get driver and device, if implemented */
curl = cdev->directory->links;
while (curl != NULL) {
if (strncmp(curl->name, SYSFS_DEVICES_NAME, 6) == 0) {
sdev = sysfs_open_device(curl->target->path);
if (sdev != NULL) {
cdev->sysdevice = sdev;
if (cdev->driver != NULL)
sdev->driver = cdev->driver;
}
} else if (strncmp(curl->name, SYSFS_DRIVERS_NAME, 6) == 0) {
drv = sysfs_open_driver(curl->target->path);
if (drv != NULL) {
cdev->driver = drv;
if (cdev->sysdevice != NULL)
drv->device = cdev->sysdevice;
}
}
curl = curl->next;
}
return cdev;
}
/**
* add_dev_to_class: adds a class device to class list
* @class: class to add the device
* @dev: device to add
*/
static void add_dev_to_class(struct sysfs_class *cls,
struct sysfs_class_device *dev)
{
if (cls != NULL && dev != NULL) {
dev->next = cls->devices;
cls->devices = dev;
}
}
/**
* get_all_class_devices: gets all devices for class
* @class: class to get devices for
* returns 0 with success and -1 with failure
*/
static int get_all_class_devices(struct sysfs_class *cls)
{
struct sysfs_class_device *dev = NULL;
struct sysfs_directory *cur = NULL, *next = NULL;
if (cls == NULL || cls->directory == NULL) {
errno = EINVAL;
return -1;
}
for (cur = cls->directory->subdirs; cur != NULL; cur = next) {
next = cur->next;
dev = sysfs_open_class_device(cur->path);
if (dev == NULL) {
dprintf(stderr, "Error opening device at %s\n",
cur->path);
continue;
}
add_dev_to_class(cls, dev);
}
return 0;
}
/**
* sysfs_open_class: opens specific class and all its devices on system
* returns sysfs_class structure with success or NULL with error.
*/
struct sysfs_class *sysfs_open_class(const char *name)
{
struct sysfs_class *cls = NULL;
struct sysfs_directory *classdir = NULL;
if (name == NULL) {
errno = EINVAL;
return NULL;
}
cls = alloc_class();
if (cls == NULL) {
perror("malloc");
return NULL;
}
strcpy(cls->name, name);
classdir = open_class_dir(name);
if (classdir == NULL) {
dprintf(stderr,
"Invalid class, %s not supported on this system\n",
name);
sysfs_close_class(cls);
return NULL;
}
cls->directory = classdir;
if ((get_all_class_devices(cls)) != 0) {
dprintf(stderr, "Error reading %s class devices\n", name);
sysfs_close_class(cls);
return NULL;
}
return cls;
}

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/*
* sysfs_device.c
*
* Generic device utility functions for libsysfs
*
* Copyright (C) 2003 International Business Machines, Inc.
*
* 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
*
*/
#include "libsysfs.h"
#include "sysfs.h"
/**
* sysfs_close_device: closes and cleans up a device
* @dev = device to clean up
*/
void sysfs_close_device(struct sysfs_device *dev)
{
if (dev != NULL) {
dev->next = NULL;
dev->driver = NULL;
if (dev->directory != NULL)
sysfs_close_directory(dev->directory);
dev->children = NULL;
free(dev);
}
}
/**
* alloc_device: allocates and initializes device structure
* returns struct sysfs_device
*/
static struct sysfs_device *alloc_device(void)
{
return (struct sysfs_device *)calloc(1, sizeof(struct sysfs_device));
}
/**
* sysfs_get_device_attr: searches dev's attributes by name
* @dev: device to look through
* @name: attribute name to get
* returns sysfs_attribute reference with success or NULL with error.
*/
struct sysfs_attribute *sysfs_get_device_attr(struct sysfs_device *dev,
const char *name)
{
struct sysfs_attribute *cur = NULL;
char attrname[SYSFS_NAME_LEN];
if (dev == NULL || dev->directory == NULL || name == NULL) {
errno = EINVAL;
return NULL;
}
for (cur = dev->directory->attributes; cur != NULL; cur = cur->next) {
if ((sysfs_get_name_from_path(cur->path, attrname,
SYSFS_NAME_LEN)) != 0)
continue;
if (strcmp(name, attrname) != 0)
continue;
return cur;
}
return NULL;
}
/**
* sysfs_open_device: opens and populates device structure
* @path: path to device, this is the /sys/devices/ path
* returns sysfs_device structure with success or NULL with error
*/
struct sysfs_device *sysfs_open_device(const char *path)
{
struct sysfs_device *dev = NULL;
struct sysfs_directory *sdir = NULL;
char *p = NULL;
if (path == NULL) {
errno = EINVAL;
return NULL;
}
dev = alloc_device();
if (dev == NULL) {
dprintf(stderr, "Error allocating device at %s\n", path);
return NULL;
}
sdir = sysfs_open_directory(path);
if (sdir == NULL) {
dprintf(stderr, "Invalid device at %s\n", path);
errno = EINVAL;
sysfs_close_device(dev);
return NULL;
}
if ((sysfs_read_directory(sdir)) != 0) {
dprintf(stderr, "Error reading device directory at %s\n", path);
sysfs_close_directory(sdir);
sysfs_close_device(dev);
return NULL;
}
dev->directory = sdir;
sysfs_get_name_from_path(sdir->path, dev->bus_id, SYSFS_NAME_LEN);
/* get device name */
p = sysfs_get_value_from_attributes(sdir->attributes,
SYSFS_NAME_ATTRIBUTE);
if (p != NULL) {
strncpy(dev->name, p, SYSFS_NAME_LEN);
p = dev->name + strlen(dev->name) - 1;
if ((strlen(dev->name) > 0) && *p == '\n')
*p = '\0';
}
return dev;
}
/**
* sysfs_close_device_tree: closes every device in the supplied tree,
* closing children only.
* @devroot: device root of tree.
*/
void sysfs_close_device_tree(struct sysfs_device *devroot)
{
if (devroot != NULL) {
if (devroot->children != NULL) {
struct sysfs_device *child = NULL, *next = NULL;
for (child = devroot->children; child != NULL;
child = next) {
next = child->next;
sysfs_close_device_tree(child);
}
}
sysfs_close_device(devroot);
}
}
/**
* add_device_child_to_parent: adds child device to parent
* @parent: parent device.
* @child: child device to add.
*/
static void add_device_child_to_parent(struct sysfs_device *parent,
struct sysfs_device *child)
{
if (parent != NULL && child != NULL) {
child->next = parent->children;
parent->children = child;
child->parent = parent;
}
}
/**
* sysfs_open_device_tree: opens root device and all of its children,
* creating a tree of devices. Only opens children.
* @path: sysfs path to devices
* returns struct sysfs_device and its children with success or NULL with
* error.
*/
struct sysfs_device *sysfs_open_device_tree(const char *path)
{
struct sysfs_device *rootdev = NULL, *new = NULL;
struct sysfs_directory *cur = NULL;
if (path == NULL) {
errno = EINVAL;
return NULL;
}
rootdev = sysfs_open_device(path);
if (rootdev == NULL) {
dprintf(stderr, "Error opening root device at %s\n", path);
return NULL;
}
cur = rootdev->directory->subdirs;
while (cur != NULL) {
new = sysfs_open_device_tree(cur->path);
if (new == NULL) {
dprintf(stderr, "Error opening device tree at %s\n",
cur->path);
sysfs_close_device_tree(rootdev);
return NULL;
}
add_device_child_to_parent(rootdev, new);
cur = cur->next;
}
return rootdev;
}

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/*
* syfs_dir.c
*
* Directory utility functions for libsysfs
*
* Copyright (C) 2003 International Business Machines, Inc.
*
* 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
*
*/
#include "libsysfs.h"
#include "sysfs.h"
/**
* sysfs_close_attribute: closes and cleans up attribute
* @sysattr: attribute to close.
*/
void sysfs_close_attribute(struct sysfs_attribute *sysattr)
{
if (sysattr != NULL) {
if (sysattr->value != NULL)
free(sysattr->value);
free(sysattr);
}
}
/**
* alloc_attribute: allocates and initializes attribute structure
* returns struct sysfs_attribute with success and NULL with error.
*/
static struct sysfs_attribute *alloc_attribute(void)
{
return (struct sysfs_attribute *)
calloc(1, sizeof(struct sysfs_attribute));
}
/**
* sysfs_open_attribute: creates sysfs_attribute structure
* @path: path to attribute.
* returns sysfs_attribute struct with success and NULL with error.
*/
struct sysfs_attribute *sysfs_open_attribute(const char *path)
{
struct sysfs_attribute *sysattr = NULL;
struct stat fileinfo;
if (path == NULL) {
errno = EINVAL;
return NULL;
}
sysattr = alloc_attribute();
if (sysattr == NULL) {
dprintf(stderr, "Error allocating attribute at %s\n", path);
return NULL;
}
strncpy(sysattr->path, path, sizeof(sysattr->path));
if ((stat(sysattr->path, &fileinfo)) != 0) {
perror("stat");
sysattr->method = 0;
} else {
if (fileinfo.st_mode & S_IRUSR)
sysattr->method |= SYSFS_METHOD_SHOW;
if (fileinfo.st_mode & S_IWUSR)
sysattr->method |= SYSFS_METHOD_STORE;
}
return sysattr;
}
/**
* sysfs_read_attribute: reads value from attribute
* @sysattr: attribute to read
* returns 0 with success and -1 with error.
*/
int sysfs_read_attribute(struct sysfs_attribute *sysattr)
{
char *fbuf = NULL;
char *vbuf = NULL;
size_t length = 0;
int pgsize = 0;
int fd;
if (sysattr == NULL) {
errno = EINVAL;
return -1;
}
if (!(sysattr->method & SYSFS_METHOD_SHOW)) {
dprintf (stderr, "Show method not supported for attribute %s\n",
sysattr->path);
return -1;
}
pgsize = getpagesize();
fbuf = (char *)calloc(1, pgsize+1);
if (fbuf == NULL) {
perror("calloc");
return -1;
}
if ((fd = open(sysattr->path, O_RDONLY)) < 0) {
dprintf (stderr, "Error reading attribute %s\n", sysattr->path);
free(fbuf);
return -1;
}
length = read(fd, fbuf, pgsize);
if (length < 0) {
dprintf (stderr, "Error reading from attribute %s\n",
sysattr->path);
close(fd);
free(fbuf);
return -1;
}
sysattr->len = length;
close(fd);
vbuf = (char *)realloc(fbuf, length+1);
if (vbuf == NULL) {
perror("realloc");
free(fbuf);
return -1;
}
sysattr->value = vbuf;
return 0;
}
/**
* sysfs_read_attribute_value: given path to attribute, return its value.
* values can be up to a pagesize, if buffer is smaller the value will
* be truncated.
* @attrpath: sysfs path to attribute
* @value: buffer to put value
* @vsize: size of value buffer
* returns 0 with success and -1 with error.
*/
int sysfs_read_attribute_value(const char *attrpath, char *value, size_t vsize)
{
struct sysfs_attribute *attr = NULL;
size_t length = 0;
if (attrpath == NULL || value == NULL) {
errno = EINVAL;
return -1;
}
attr = sysfs_open_attribute(attrpath);
if (attr == NULL) {
dprintf(stderr, "Invalid attribute path %s\n", attrpath);
errno = EINVAL;
return -1;
}
if((sysfs_read_attribute(attr)) != 0 || attr->value == NULL) {
dprintf(stderr, "Error reading from attribute %s\n", attrpath);
sysfs_close_attribute(attr);
return -1;
}
length = strlen(attr->value);
if (length > vsize)
dprintf(stderr,
"Value length %d is larger than supplied buffer %d\n",
length, vsize);
strncpy(value, attr->value, vsize);
sysfs_close_attribute(attr);
return 0;
}
/**
* sysfs_get_value_from_attrbutes: given a linked list of attributes and an
* attribute name, return its value
* @attr: attribute to search
* @name: name to look for
* returns char * value - could be NULL
*/
char *sysfs_get_value_from_attributes(struct sysfs_attribute *attr,
const char *name)
{
struct sysfs_attribute *cur = NULL;
char tmpname[SYSFS_NAME_LEN];
if (attr == NULL || name == NULL) {
errno = EINVAL;
return NULL;
}
cur = attr;
while (cur != NULL) {
memset(tmpname, 0, SYSFS_NAME_LEN);
if ((sysfs_get_name_from_path(cur->path, tmpname,
SYSFS_NAME_LEN)) != 0) {
cur = cur->next;
continue;
}
if (strcmp(tmpname, name) == 0)
return cur->value;
cur = cur->next;
}
return NULL;
}
/**
* add_subdir_to_dir: adds subdirectory to directory's subdirs
* @sysdir: directory to add subdir to
* @subdir: subdirectory to add.
*/
static void add_subdir_to_dir(struct sysfs_directory *sysdir,
struct sysfs_directory *subdir)
{
if (sysdir != NULL && subdir != NULL) {
subdir->next = sysdir->subdirs;
sysdir->subdirs = subdir;
}
}
/**
* add_attr_to_dir: adds attribute to directory's attributes
* @sysdir: directory to add attribute to
* @sysattr: attribute to add.
*/
static void add_attr_to_dir(struct sysfs_directory *sysdir,
struct sysfs_attribute *sysattr)
{
if (sysdir != NULL && sysattr != NULL) {
sysattr->next = sysdir->attributes;
sysdir->attributes = sysattr;
}
}
/**
* sysfs_close_dlink: closes and cleans up directory link.
* @dlink: directory link to close.
*/
void sysfs_close_dlink(struct sysfs_dlink *dlink)
{
if (dlink != NULL) {
dlink->next = NULL;
if (dlink->target != NULL)
sysfs_close_directory(dlink->target);
free(dlink);
}
}
/**
* add_dlink_to_dir: adds directory link to directory's links list.
* @sysdir: directory to add it to.
* @dlink: link to add.
*/
static void add_dlink_to_dir(struct sysfs_directory *sysdir,
struct sysfs_dlink *dlink)
{
if (sysdir != NULL && dlink != NULL) {
dlink->next = sysdir->links;
sysdir->links = dlink;
}
}
/**
* sysfs_close_directory: closes directory, cleans up attributes and links
* @sysdir: sysfs_directory to close
*/
void sysfs_close_directory(struct sysfs_directory *sysdir)
{
struct sysfs_directory *sdir = NULL, *dnext = NULL;
struct sysfs_dlink *dlink = NULL, *nextl = NULL;
struct sysfs_attribute *attr = NULL, *anext = NULL;
if (sysdir != NULL) {
if (sysdir->subdirs != NULL) {
for (sdir = sysdir->subdirs; sdir != NULL;
sdir = dnext) {
dnext = sdir->next;
sysfs_close_directory(sdir);
}
}
if (sysdir->links != NULL) {
for (dlink = sysdir->links; dlink != NULL;
dlink = nextl) {
nextl = dlink->next;
sysfs_close_dlink(dlink);
}
}
if (sysdir->attributes != NULL) {
for (attr = sysdir->attributes; attr != NULL;
attr = anext) {
anext = attr->next;
/* sysfs_close_attribute(attr); */
if (attr->value != NULL)
free(attr->value);
free(attr);
}
}
free(sysdir);
}
}
/**
* alloc_directory: allocates and initializes directory structure
* returns struct sysfs_directory with success or NULL with error.
*/
static struct sysfs_directory *alloc_directory(void)
{
return (struct sysfs_directory *)
calloc(1, sizeof(struct sysfs_directory));
}
/**
* alloc_dlink: allocates and initializes directory link structure
* returns struct sysfs_dlink with success or NULL with error.
*/
static struct sysfs_dlink *alloc_dlink(void)
{
return (struct sysfs_dlink *)calloc(1, sizeof(struct sysfs_dlink));
}
/**
* sysfs_open_directory: opens a sysfs directory, creates dir struct, and
* returns.
* @path: path of directory to open.
* returns: struct sysfs_directory * with success and NULL on error.
*/
struct sysfs_directory *sysfs_open_directory(const char *path)
{
struct sysfs_directory *sdir = NULL;
if (path == NULL) {
errno = EINVAL;
return NULL;
}
sdir = alloc_directory();
if (sdir == NULL) {
dprintf(stderr, "Error allocating directory %s\n", path);
return NULL;
}
strncpy(sdir->path, path, sizeof(sdir->path));
return sdir;
}
/**
* sysfs_open_dlink: opens a sysfs directory link, creates struct, and returns
* @path: path of link to open.
* returns: struct sysfs_dlink * with success and NULL on error.
*/
struct sysfs_dlink *sysfs_open_dlink(const char *linkpath)
{
struct sysfs_dlink *dlink = NULL;
struct sysfs_directory *tdir = NULL;
char name[SYSFS_NAME_LEN];
char target[SYSFS_PATH_MAX];
if (linkpath == NULL) {
errno = EINVAL;
return NULL;
}
memset(name, 0, SYSFS_NAME_LEN);
memset(target, 0, SYSFS_PATH_MAX);
if ((sysfs_get_name_from_path(linkpath, name, SYSFS_NAME_LEN)) != 0
|| (sysfs_get_link(linkpath, target, SYSFS_PATH_MAX)) != 0) {
errno = EINVAL;
dprintf(stderr, "Invalid link path %s\n", linkpath);
return NULL;
}
dlink = alloc_dlink();
if (dlink == NULL) {
dprintf(stderr,
"Error allocating directory link %s\n", linkpath);
return NULL;
}
strcpy(dlink->name, name);
tdir = sysfs_open_directory(target);
if (tdir == NULL) {
dprintf(stderr, "Invalid directory link target %s\n", target);
sysfs_close_dlink(dlink);
return NULL;
}
dlink->target = tdir;
return dlink;
}
/**
* sysfs_read_directory: grabs attributes, links, and subdirectories
* @sysdir: sysfs directory to open
* returns 0 with success and -1 with error.
*/
int sysfs_read_directory(struct sysfs_directory *sysdir)
{
DIR *dir = NULL;
struct dirent *dirent = NULL;
struct stat astats;
struct sysfs_attribute *attr = NULL;
struct sysfs_directory *subdir = NULL;
struct sysfs_dlink *dlink = NULL;
char file_path[SYSFS_PATH_MAX];
int retval = 0;
if (sysdir == NULL) {
errno = EINVAL;
return -1;
}
dir = opendir(sysdir->path);
if (dir == NULL) {
perror("opendir");
return -1;
}
while(((dirent = readdir(dir)) != NULL) && retval == 0) {
if (0 == strcmp(dirent->d_name, "."))
continue;
if (0 == strcmp(dirent->d_name, ".."))
continue;
memset(file_path, 0, SYSFS_PATH_MAX);
strncpy(file_path, sysdir->path, sizeof(file_path));
strncat(file_path, "/", sizeof(file_path));
strncat(file_path, dirent->d_name, sizeof(file_path));
if ((lstat(file_path, &astats)) != 0) {
perror("stat");
continue;
}
if (S_ISREG(astats.st_mode)) {
attr = sysfs_open_attribute(file_path);
if (attr == NULL) {
dprintf (stderr, "Error opening attribute %s\n",
file_path);
retval = -1;
break;
}
if (attr->method & SYSFS_METHOD_SHOW) {
if ((sysfs_read_attribute(attr)) != 0) {
dprintf (stderr,
"Error reading attribute %s\n",
file_path);
sysfs_close_attribute(attr);
continue;
}
}
add_attr_to_dir(sysdir, attr);
} else if (S_ISDIR(astats.st_mode)) {
subdir = sysfs_open_directory(file_path);
if (subdir == NULL) {
dprintf (stderr, "Error opening directory %s\n",
file_path);
retval = -1;
break;
}
add_subdir_to_dir(sysdir, subdir);
} else if (S_ISLNK(astats.st_mode)) {
dlink = sysfs_open_dlink(file_path);
if (dlink == NULL) {
dprintf(stderr, "Error opening link %s\n",
file_path);
retval = -1;
break;
}
add_dlink_to_dir(sysdir, dlink);
}
}
closedir(dir);
return(retval);
}
/**
* sysfs_read_dlinks: reads a directory link's target directory. Can
* supply a linked list of links.
* @dlink: directory link to read.
* returns 0 with success or -1 with error.
*/
int sysfs_read_dlinks(struct sysfs_dlink *dlink)
{
struct sysfs_dlink *cur = NULL;
if (dlink == NULL || dlink->target == NULL) {
errno = EINVAL;
return -1;
}
cur = dlink;
while (cur != NULL) {
if ((sysfs_read_directory(cur->target)) != 0) {
dprintf(stderr,
"Error reading directory link target %s\n",
dlink->name);
return -1;
}
cur = cur->next;
}
return 0;
}

89
libsysfs/sysfs_driver.c Normal file
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@ -0,0 +1,89 @@
/*
* sysfs_driver.c
*
* Driver utility functions for libsysfs
*
* Copyright (C) 2003 International Business Machines, Inc.
*
* 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
*
*/
#include "libsysfs.h"
#include "sysfs.h"
/**
* sysfs_close_driver: closes and cleans up driver structure
* @driver: driver to close
*/
void sysfs_close_driver(struct sysfs_driver *driver)
{
if (driver != NULL) {
if (driver->directory != NULL)
sysfs_close_directory(driver->directory);
free(driver);
}
}
/**
* alloc_driver: allocates and initializes driver
* returns struct sysfs_driver with success and NULL with error.
*/
static struct sysfs_driver *alloc_driver(void)
{
return (struct sysfs_driver *)calloc(1, sizeof(struct sysfs_driver));
}
/**
* sysfs_open_driver: opens and initializes driver structure
* @path: path to driver directory
* returns struct sysfs_driver with success and NULL with error
*/
struct sysfs_driver *sysfs_open_driver(const char *path)
{
struct sysfs_driver *driver = NULL;
struct sysfs_directory *sdir = NULL;
char devname[SYSFS_NAME_LEN];
if (path == NULL) {
errno = EINVAL;
return NULL;
}
sdir = sysfs_open_directory(path);
if (sdir == NULL) {
dprintf (stderr, "Error opening directory %s\n", path);
return NULL;
}
if ((sysfs_read_directory(sdir)) != 0) {
dprintf (stderr, "Error reading directory %s\n", path);
sysfs_close_directory(sdir);
return NULL;
}
driver = alloc_driver();
if (driver == NULL) {
dprintf(stderr, "Error allocating driver at %s\n", path);
sysfs_close_directory(sdir);
return NULL;
}
if ((sysfs_get_name_from_path(path, devname, SYSFS_NAME_LEN)) != 0) {
dprintf (stderr, "Error reading directory %s\n", path);
sysfs_close_directory(sdir);
free(driver);
return NULL;
}
strncpy(driver->name, devname, sizeof(driver->name));
driver->directory = sdir;
return driver;
}

156
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/*
* syfs_utils.c
*
* System utility functions for libsysfs
*
* Copyright (C) 2003 International Business Machines, Inc.
*
* 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
*
*/
#include "libsysfs.h"
#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)
{
FILE *mnt;
struct mntent *mntent;
int ret = 0;
size_t dirlen = 0;
/* check arg */
if (fs_type == NULL || mnt_path == NULL) {
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;
}
}
}
endmntent(mnt);
if (dirlen == 0 && ret == 0) {
dprintf(stderr, "Filesystem %s not found!\n", fs_type);
errno = EINVAL;
ret = -1;
}
return ret;
}
/*
* sysfs_get_mnt_path: Gets the sysfs mount point.
* @mnt_path: place to put "sysfs" mount point
* @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 ret = -1;
if (mnt_path != NULL)
ret = sysfs_get_fs_mnt_path(SYSFS_FSTYPE_NAME, mnt_path, len);
else
errno = EINVAL;
return ret;
}
/**
* sysfs_get_name_from_path: returns last name from a "/" delimited path
* @path: path to get name from
* @name: where to put name
* @len: size of name
*/
int sysfs_get_name_from_path(const char *path, char *name, size_t len)
{
char *n = NULL;
if (path == NULL || name == NULL) {
errno = EINVAL;
return -1;
}
n = strrchr(path, '/');
if (n == NULL) {
errno = EINVAL;
return -1;
}
n++;
strncpy(name, n, len);
return 0;
}
/**
* sysfs_get_link: returns link source
* @path: symbolic link's path
* @target: where to put name
* @len: size of name
*/
int sysfs_get_link(const char *path, char *target, size_t len)
{
char devdir[SYSFS_PATH_MAX];
char linkpath[SYSFS_PATH_MAX];
char *d = NULL;
if (path == NULL || target == NULL) {
errno = EINVAL;
return -1;
}
memset(devdir, 0, SYSFS_PATH_MAX);
memset(linkpath, 0, 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 == '.')
d++;
d--;
strcat(devdir, d);
strncpy(target, devdir, len);
return 0;
}