-/*
- * sysfs_bus.c
- *
- * Generic bus utility functions 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
- *
- */
-#include "libsysfs.h"
-#include "sysfs.h"
-
-static void sysfs_close_dev(void *dev)
-{
- sysfs_close_device((struct sysfs_device *)dev);
-}
-
-static void sysfs_close_drv(void *drv)
-{
- sysfs_close_driver((struct sysfs_driver *)drv);
-}
-
-/*
- * compares devices' bus ids.
- * @a: device id looking for
- * @b: sysfs_device comparing being compared
- * returns 1 if a==b->bus_id or 0 not equal
- */
-static int bus_device_id_equal(void *a, void *b)
-{
- if (a == NULL || b == NULL)
- return 0;
-
- if (strcmp(((char *)a), ((struct sysfs_device *)b)->bus_id)
- == 0)
- return 1;
- return 0;
-}
-
-/*
- * compares drivers' names.
- * @a: driver name looking for
- * @b: sysfs_driver comparing being compared
- * returns 1 if a==b->name or 0 not equal
- */
-static int bus_driver_name_equal(void *a, void *b)
-{
- if (a == NULL || b == NULL)
- return 0;
-
- if (strcmp(((char *)a), ((struct sysfs_driver *)b)->name) == 0)
- return 1;
- return 0;
-}
-
-/**
- * sysfs_close_bus: close single bus
- * @bus: bus structure
- */
-void sysfs_close_bus(struct sysfs_bus *bus)
-{
- if (bus != NULL) {
- if (bus->directory != NULL)
- sysfs_close_directory(bus->directory);
- if (bus->devices)
- dlist_destroy(bus->devices);
- if (bus->drivers)
- dlist_destroy(bus->drivers);
- 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));
-}
-
-/**
- * sysfs_get_bus_devices: gets all devices for bus
- * @bus: bus to get devices for
- * returns dlist of devices with success and NULL with failure
- */
-struct dlist *sysfs_get_bus_devices(struct sysfs_bus *bus)
-{
- struct sysfs_device *bdev = NULL;
- struct sysfs_directory *devdir = NULL;
- struct sysfs_link *curl = NULL;
- char path[SYSFS_PATH_MAX];
-
- if (bus == NULL) {
- errno = EINVAL;
- return NULL;
- }
- memset(path, 0, SYSFS_PATH_MAX);
- safestrcpy(path, bus->path);
- safestrcat(path, "/");
- safestrcat(path, SYSFS_DEVICES_NAME);
- devdir = sysfs_open_directory(path);
- if (devdir == NULL)
- return NULL;
-
- if (sysfs_read_dir_links(devdir) != 0) {
- sysfs_close_directory(devdir);
- return NULL;
- }
-
- if (devdir->links != NULL) {
- dlist_for_each_data(devdir->links, curl, struct sysfs_link) {
- bdev = sysfs_open_device_path(curl->target);
- if (bdev == NULL) {
- dprintf("Error opening device at %s\n",
- curl->target);
- continue;
- }
- if (bus->devices == NULL)
- bus->devices = dlist_new_with_delete
- (sizeof(struct sysfs_device),
- sysfs_close_dev);
- dlist_unshift_sorted(bus->devices, bdev, sort_list);
- }
- }
- sysfs_close_directory(devdir);
-
- return (bus->devices);
-}
-
-/**
- * sysfs_get_bus_drivers: get all pci drivers
- * @bus: pci bus to add drivers to
- * returns dlist of drivers with success and NULL with error
- */
-struct dlist *sysfs_get_bus_drivers(struct sysfs_bus *bus)
-{
- struct sysfs_driver *driver = NULL;
- struct sysfs_directory *drvdir = NULL;
- struct sysfs_directory *cursub = NULL;
- char path[SYSFS_PATH_MAX];
-
- if (bus == NULL) {
- errno = EINVAL;
- return NULL;
- }
- memset(path, 0, SYSFS_PATH_MAX);
- safestrcpy(path, bus->path);
- safestrcat(path, "/");
- safestrcat(path, SYSFS_DRIVERS_NAME);
- drvdir = sysfs_open_directory(path);
- if (drvdir == NULL)
- return NULL;
-
- if (sysfs_read_dir_subdirs(drvdir) != 0) {
- sysfs_close_directory(drvdir);
- return NULL;
- }
- if (drvdir->subdirs != NULL) {
- dlist_for_each_data(drvdir->subdirs, cursub,
- struct sysfs_directory) {
- driver = sysfs_open_driver_path(cursub->path);
- if (driver == NULL) {
- dprintf("Error opening driver at %s\n",
- cursub->path);
- continue;
- }
- if (bus->drivers == NULL)
- bus->drivers = dlist_new_with_delete
- (sizeof(struct sysfs_driver),
- sysfs_close_drv);
- dlist_unshift_sorted(bus->drivers, driver, sort_list);
- }
- }
- sysfs_close_directory(drvdir);
- return (bus->drivers);
-}
-
-/**
- * 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;
- 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("Sysfs not supported on this system\n");
- return NULL;
- }
-
- safestrcat(buspath, "/");
- safestrcat(buspath, SYSFS_BUS_NAME);
- safestrcat(buspath, "/");
- safestrcat(buspath, name);
- if ((sysfs_path_is_dir(buspath)) != 0) {
- dprintf("Invalid path to bus: %s\n", buspath);
- return NULL;
- }
- bus = alloc_bus();
- if (bus == NULL) {
- dprintf("calloc failed\n");
- return NULL;
- }
- safestrcpy(bus->name, name);
- safestrcpy(bus->path, buspath);
- if ((sysfs_remove_trailing_slash(bus->path)) != 0) {
- dprintf("Incorrect path to bus %s\n", bus->path);
- sysfs_close_bus(bus);
- return NULL;
- }
-
- return bus;
-}
-
-/**
- * sysfs_get_bus_device: Get specific device on bus using device's id
- * @bus: bus to find device on
- * @id: bus_id for device
- * returns struct sysfs_device reference or NULL if not found.
- */
-struct sysfs_device *sysfs_get_bus_device(struct sysfs_bus *bus, char *id)
-{
- if (bus == NULL || id == NULL) {
- errno = EINVAL;
- return NULL;
- }
-
- if (bus->devices == NULL) {
- bus->devices = sysfs_get_bus_devices(bus);
- if (bus->devices == NULL)
- return NULL;
- }
-
- return (struct sysfs_device *)dlist_find_custom(bus->devices, id,
- bus_device_id_equal);
-}
-
-/**
- * sysfs_get_bus_driver: Get specific driver on bus using driver name
- * @bus: bus to find driver on
- * @drvname: name of driver
- * returns struct sysfs_driver reference or NULL if not found.
- */
-struct sysfs_driver *sysfs_get_bus_driver(struct sysfs_bus *bus,
- char *drvname)
-{
- if (bus == NULL || drvname == NULL) {
- errno = EINVAL;
- return NULL;
- }
-
- if (bus->drivers == NULL) {
- bus->drivers = sysfs_get_bus_drivers(bus);
- if (bus->drivers == NULL)
- return NULL;
- }
-
- return (struct sysfs_driver *)dlist_find_custom(bus->drivers, drvname,
- bus_driver_name_equal);
-}
-
-/**
- * sysfs_get_bus_attributes: returns bus' dlist of attributes
- * @bus: bus to get attributes for.
- * returns dlist of attributes or NULL if there aren't any.
- */
-struct dlist *sysfs_get_bus_attributes(struct sysfs_bus *bus)
-{
- if (bus == NULL)
- return NULL;
-
- if (bus->directory == NULL) {
- bus->directory = sysfs_open_directory(bus->path);
- if (bus->directory == NULL)
- return NULL;
- }
- if (bus->directory->attributes == NULL) {
- if ((sysfs_read_dir_attributes(bus->directory)) != 0)
- return NULL;
- }
- return bus->directory->attributes;
-}
-
-/**
- * sysfs_refresh_bus_attributes: refreshes the bus's list of attributes
- * @bus: sysfs_bus whose attributes to refresh
- *
- * NOTE: Upon return, prior references to sysfs_attributes for this bus
- * _may_ not be valid
- *
- * Returns list of attributes on success and NULL on failure
- */
-struct dlist *sysfs_refresh_bus_attributes(struct sysfs_bus *bus)
-{
- if (bus == NULL) {
- errno = EINVAL;
- return NULL;
- }
-
- if (bus->directory == NULL)
- return (sysfs_get_bus_attributes(bus));
-
- if ((sysfs_refresh_dir_attributes(bus->directory)) != 0) {
- dprintf("Error refreshing bus attributes\n");
- return NULL;
- }
-
- return (bus->directory->attributes);
-}
-
-/**
- * sysfs_get_bus_attribute: gets a specific bus attribute, if buses had
- * attributes.
- * @bus: bus to retrieve attribute from
- * @attrname: attribute name to retrieve
- * returns reference to sysfs_attribute if found or NULL if not found
- */
-struct sysfs_attribute *sysfs_get_bus_attribute(struct sysfs_bus *bus,
- char *attrname)
-{
- struct dlist *attrlist = NULL;
-
- if (bus == NULL) {
- errno = EINVAL;
- return NULL;
- }
- attrlist = sysfs_get_bus_attributes(bus);
- if (attrlist == NULL)
- return NULL;
-
- return sysfs_get_directory_attribute(bus->directory, attrname);
-}
-
-/**
- * sysfs_find_driver_bus: locates the bus the driver is on.
- * @driver: name of the driver to locate
- * @busname: buffer to copy name to
- * @bsize: buffer size
- * returns 0 with success, -1 with error
- */
-int sysfs_find_driver_bus(const char *driver, char *busname, size_t bsize)
-{
- char subsys[SYSFS_PATH_MAX], *bus = NULL, *curdrv = NULL;
- struct dlist *buslist = NULL, *drivers = NULL;
-
- if (driver == NULL || busname == NULL) {
- errno = EINVAL;
- return -1;
- }
-
- memset(subsys, 0, SYSFS_PATH_MAX);
- safestrcpy(subsys, SYSFS_BUS_NAME);
- buslist = sysfs_open_subsystem_list(subsys);
- if (buslist != NULL) {
- dlist_for_each_data(buslist, bus, char) {
- memset(subsys, 0, SYSFS_PATH_MAX);
- safestrcpy(subsys, SYSFS_BUS_NAME);
- safestrcat(subsys, "/");
- safestrcat(subsys, bus);
- safestrcat(subsys, "/");
- safestrcat(subsys, SYSFS_DRIVERS_NAME);
- drivers = sysfs_open_subsystem_list(subsys);
- if (drivers != NULL) {
- dlist_for_each_data(drivers, curdrv, char) {
- if (strcmp(driver, curdrv) == 0) {
- safestrcpymax(busname,
- bus, bsize);
- sysfs_close_list(drivers);
- sysfs_close_list(buslist);
- return 0;
- }
- }
- sysfs_close_list(drivers);
- }
- }
- sysfs_close_list(buslist);
- }
- return -1;
-}
~ianmdlvl / elogind.git / commitdiff