--- /dev/null
+
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+
--- /dev/null
+# 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)
--- /dev/null
+/*
+ * 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_ */
--- /dev/null
+/*
+ * 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_ */
--- /dev/null
+/*
+ * 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;
+}
--- /dev/null
+/*
+ * 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;
+}
--- /dev/null
+/*
+ * 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;
+}
--- /dev/null
+/*
+ * 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;
+}
--- /dev/null
+/*
+ * 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;
+}
--- /dev/null
+/*
+ * 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;
+}
projects / systemd / commitdiff