diff options
Diffstat (limited to 'udev/udev_sysfs.c')
| -rw-r--r-- | udev/udev_sysfs.c | 499 |
1 files changed, 0 insertions, 499 deletions
diff --git a/udev/udev_sysfs.c b/udev/udev_sysfs.c deleted file mode 100644 index 2ea724a78f..0000000000 --- a/udev/udev_sysfs.c +++ /dev/null @@ -1,499 +0,0 @@ -/* - * Copyright (C) 2005-2008 Kay Sievers <kay.sievers@vrfy.org> - * - * This program is free software: you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation, either version 2 of the License, or - * (at your option) any later version. - * - * This program 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 General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program. If not, see <http://www.gnu.org/licenses/>. - */ - -#include <stdlib.h> -#include <stdio.h> -#include <stddef.h> -#include <unistd.h> -#include <string.h> -#include <fcntl.h> -#include <ctype.h> -#include <errno.h> -#include <sys/stat.h> - -#include "udev.h" - -/* device cache */ -static LIST_HEAD(dev_list); - -/* attribute value cache */ -static LIST_HEAD(attr_list); - -struct sysfs_attr { - struct list_head node; - char path[UTIL_PATH_SIZE]; - char *value; /* points to value_local if value is cached */ - char value_local[UTIL_NAME_SIZE]; -}; - -static int resolve_sys_link(struct udev *udev, char *path, size_t size) -{ - char link_path[UTIL_PATH_SIZE]; - char link_target[UTIL_PATH_SIZE]; - - int len; - int i; - int back; - - util_strlcpy(link_path, udev_get_sys_path(udev), sizeof(link_path)); - util_strlcat(link_path, path, sizeof(link_path)); - len = readlink(link_path, link_target, sizeof(link_target)); - if (len <= 0) - return -1; - link_target[len] = '\0'; - dbg(udev, "path link '%s' points to '%s'\n", path, link_target); - - for (back = 0; strncmp(&link_target[back * 3], "../", 3) == 0; back++) - ; - dbg(udev, "base '%s', tail '%s', back %i\n", path, &link_target[back * 3], back); - for (i = 0; i <= back; i++) { - char *pos = strrchr(path, '/'); - - if (pos == NULL) - return -1; - pos[0] = '\0'; - } - dbg(udev, "after moving back '%s'\n", path); - util_strlcat(path, "/", size); - util_strlcat(path, &link_target[back * 3], size); - return 0; -} - -int sysfs_init(void) -{ - INIT_LIST_HEAD(&dev_list); - INIT_LIST_HEAD(&attr_list); - return 0; -} - -void sysfs_cleanup(void) -{ - struct sysfs_attr *attr_loop; - struct sysfs_attr *attr_temp; - struct sysfs_device *dev_loop; - struct sysfs_device *dev_temp; - - list_for_each_entry_safe(attr_loop, attr_temp, &attr_list, node) { - list_del(&attr_loop->node); - free(attr_loop); - } - - list_for_each_entry_safe(dev_loop, dev_temp, &dev_list, node) { - list_del(&dev_loop->node); - free(dev_loop); - } -} - -void sysfs_device_set_values(struct udev *udev, - struct sysfs_device *dev, const char *devpath, - const char *subsystem, const char *driver) -{ - char *pos; - - util_strlcpy(dev->devpath, devpath, sizeof(dev->devpath)); - if (subsystem != NULL) - util_strlcpy(dev->subsystem, subsystem, sizeof(dev->subsystem)); - if (driver != NULL) - util_strlcpy(dev->driver, driver, sizeof(dev->driver)); - - /* set kernel name */ - pos = strrchr(dev->devpath, '/'); - if (pos == NULL) - return; - util_strlcpy(dev->kernel, &pos[1], sizeof(dev->kernel)); - dbg(udev, "kernel='%s'\n", dev->kernel); - - /* some devices have '!' in their name, change that to '/' */ - pos = dev->kernel; - while (pos[0] != '\0') { - if (pos[0] == '!') - pos[0] = '/'; - pos++; - } - - /* get kernel number */ - pos = &dev->kernel[strlen(dev->kernel)]; - while (isdigit(pos[-1])) - pos--; - util_strlcpy(dev->kernel_number, pos, sizeof(dev->kernel_number)); - dbg(udev, "kernel_number='%s'\n", dev->kernel_number); -} - -struct sysfs_device *sysfs_device_get(struct udev *udev, const char *devpath) -{ - char path[UTIL_PATH_SIZE]; - char devpath_real[UTIL_PATH_SIZE]; - struct sysfs_device *dev; - struct sysfs_device *dev_loop; - struct stat statbuf; - char link_path[UTIL_PATH_SIZE]; - char link_target[UTIL_PATH_SIZE]; - int len; - char *pos; - - /* we handle only these devpathes */ - if (devpath != NULL && - strncmp(devpath, "/devices/", 9) != 0 && - strncmp(devpath, "/subsystem/", 11) != 0 && - strncmp(devpath, "/module/", 8) != 0 && - strncmp(devpath, "/bus/", 5) != 0 && - strncmp(devpath, "/class/", 7) != 0 && - strncmp(devpath, "/block/", 7) != 0) - return NULL; - - dbg(udev, "open '%s'\n", devpath); - util_strlcpy(devpath_real, devpath, sizeof(devpath_real)); - util_remove_trailing_chars(devpath_real, '/'); - if (devpath[0] == '\0' ) - return NULL; - - /* look for device already in cache (we never put an untranslated path in the cache) */ - list_for_each_entry(dev_loop, &dev_list, node) { - if (strcmp(dev_loop->devpath, devpath_real) == 0) { - dbg(udev, "found in cache '%s'\n", dev_loop->devpath); - return dev_loop; - } - } - - /* if we got a link, resolve it to the real device */ - util_strlcpy(path, udev_get_sys_path(udev), sizeof(path)); - util_strlcat(path, devpath_real, sizeof(path)); - if (lstat(path, &statbuf) != 0) { - dbg(udev, "stat '%s' failed: %m\n", path); - return NULL; - } - if (S_ISLNK(statbuf.st_mode)) { - if (resolve_sys_link(udev, devpath_real, sizeof(devpath_real)) != 0) - return NULL; - - /* now look for device in cache after path translation */ - list_for_each_entry(dev_loop, &dev_list, node) { - if (strcmp(dev_loop->devpath, devpath_real) == 0) { - dbg(udev, "found in cache '%s'\n", dev_loop->devpath); - return dev_loop; - } - } - } - - /* it is a new device */ - dbg(udev, "new uncached device '%s'\n", devpath_real); - dev = malloc(sizeof(struct sysfs_device)); - if (dev == NULL) - return NULL; - memset(dev, 0x00, sizeof(struct sysfs_device)); - - sysfs_device_set_values(udev, dev, devpath_real, NULL, NULL); - - /* get subsystem name */ - util_strlcpy(link_path, udev_get_sys_path(udev), sizeof(link_path)); - util_strlcat(link_path, dev->devpath, sizeof(link_path)); - util_strlcat(link_path, "/subsystem", sizeof(link_path)); - len = readlink(link_path, link_target, sizeof(link_target)); - if (len > 0) { - /* get subsystem from "subsystem" link */ - link_target[len] = '\0'; - dbg(udev, "subsystem link '%s' points to '%s'\n", link_path, link_target); - pos = strrchr(link_target, '/'); - if (pos != NULL) - util_strlcpy(dev->subsystem, &pos[1], sizeof(dev->subsystem)); - } else if (strstr(dev->devpath, "/drivers/") != NULL) { - util_strlcpy(dev->subsystem, "drivers", sizeof(dev->subsystem)); - } else if (strncmp(dev->devpath, "/module/", 8) == 0) { - util_strlcpy(dev->subsystem, "module", sizeof(dev->subsystem)); - } else if (strncmp(dev->devpath, "/subsystem/", 11) == 0) { - pos = strrchr(dev->devpath, '/'); - if (pos == &dev->devpath[10]) - util_strlcpy(dev->subsystem, "subsystem", sizeof(dev->subsystem)); - } else if (strncmp(dev->devpath, "/class/", 7) == 0) { - pos = strrchr(dev->devpath, '/'); - if (pos == &dev->devpath[6]) - util_strlcpy(dev->subsystem, "subsystem", sizeof(dev->subsystem)); - } else if (strncmp(dev->devpath, "/bus/", 5) == 0) { - pos = strrchr(dev->devpath, '/'); - if (pos == &dev->devpath[4]) - util_strlcpy(dev->subsystem, "subsystem", sizeof(dev->subsystem)); - } - - /* get driver name */ - util_strlcpy(link_path, udev_get_sys_path(udev), sizeof(link_path)); - util_strlcat(link_path, dev->devpath, sizeof(link_path)); - util_strlcat(link_path, "/driver", sizeof(link_path)); - len = readlink(link_path, link_target, sizeof(link_target)); - if (len > 0) { - link_target[len] = '\0'; - dbg(udev, "driver link '%s' points to '%s'\n", link_path, link_target); - pos = strrchr(link_target, '/'); - if (pos != NULL) - util_strlcpy(dev->driver, &pos[1], sizeof(dev->driver)); - } - - dbg(udev, "add to cache 'devpath=%s', subsystem='%s', driver='%s'\n", dev->devpath, dev->subsystem, dev->driver); - list_add(&dev->node, &dev_list); - - return dev; -} - -struct sysfs_device *sysfs_device_get_parent(struct udev *udev, struct sysfs_device *dev) -{ - char parent_devpath[UTIL_PATH_SIZE]; - char *pos; - - dbg(udev, "open '%s'\n", dev->devpath); - - /* look if we already know the parent */ - if (dev->parent != NULL) - return dev->parent; - - util_strlcpy(parent_devpath, dev->devpath, sizeof(parent_devpath)); - dbg(udev, "'%s'\n", parent_devpath); - - /* strip last element */ - pos = strrchr(parent_devpath, '/'); - if (pos == NULL || pos == parent_devpath) - return NULL; - pos[0] = '\0'; - - if (strncmp(parent_devpath, "/class", 6) == 0) { - pos = strrchr(parent_devpath, '/'); - if (pos == &parent_devpath[6] || pos == parent_devpath) { - dbg(udev, "/class top level, look for device link\n"); - goto device_link; - } - } - if (strcmp(parent_devpath, "/block") == 0) { - dbg(udev, "/block top level, look for device link\n"); - goto device_link; - } - - /* are we at the top level? */ - pos = strrchr(parent_devpath, '/'); - if (pos == NULL || pos == parent_devpath) - return NULL; - - /* get parent and remember it */ - dev->parent = sysfs_device_get(udev, parent_devpath); - return dev->parent; - -device_link: - util_strlcpy(parent_devpath, dev->devpath, sizeof(parent_devpath)); - util_strlcat(parent_devpath, "/device", sizeof(parent_devpath)); - if (resolve_sys_link(udev, parent_devpath, sizeof(parent_devpath)) != 0) - return NULL; - - /* get parent and remember it */ - dev->parent = sysfs_device_get(udev, parent_devpath); - return dev->parent; -} - -struct sysfs_device *sysfs_device_get_parent_with_subsystem(struct udev *udev, struct sysfs_device *dev, const char *subsystem) -{ - struct sysfs_device *dev_parent; - - dev_parent = sysfs_device_get_parent(udev, dev); - while (dev_parent != NULL) { - if (strcmp(dev_parent->subsystem, subsystem) == 0) - return dev_parent; - dev_parent = sysfs_device_get_parent(udev, dev_parent); - } - return NULL; -} - -char *sysfs_attr_get_value(struct udev *udev, const char *devpath, const char *attr_name) -{ - char path_full[UTIL_PATH_SIZE]; - const char *path; - char value[UTIL_NAME_SIZE]; - struct sysfs_attr *attr_loop; - struct sysfs_attr *attr; - struct stat statbuf; - int fd; - ssize_t size; - size_t sysfs_len; - - dbg(udev, "open '%s'/'%s'\n", devpath, attr_name); - sysfs_len = util_strlcpy(path_full, udev_get_sys_path(udev), sizeof(path_full)); - if(sysfs_len >= sizeof(path_full)) - sysfs_len = sizeof(path_full) - 1; - path = &path_full[sysfs_len]; - util_strlcat(path_full, devpath, sizeof(path_full)); - util_strlcat(path_full, "/", sizeof(path_full)); - util_strlcat(path_full, attr_name, sizeof(path_full)); - - /* look for attribute in cache */ - list_for_each_entry(attr_loop, &attr_list, node) { - if (strcmp(attr_loop->path, path) == 0) { - dbg(udev, "found in cache '%s'\n", attr_loop->path); - return attr_loop->value; - } - } - - /* store attribute in cache (also negatives are kept in cache) */ - dbg(udev, "new uncached attribute '%s'\n", path_full); - attr = malloc(sizeof(struct sysfs_attr)); - if (attr == NULL) - return NULL; - memset(attr, 0x00, sizeof(struct sysfs_attr)); - util_strlcpy(attr->path, path, sizeof(attr->path)); - dbg(udev, "add to cache '%s'\n", path_full); - list_add(&attr->node, &attr_list); - - if (lstat(path_full, &statbuf) != 0) { - dbg(udev, "stat '%s' failed: %m\n", path_full); - goto out; - } - - if (S_ISLNK(statbuf.st_mode)) { - /* links return the last element of the target path */ - char link_target[UTIL_PATH_SIZE]; - int len; - const char *pos; - - len = readlink(path_full, link_target, sizeof(link_target)); - if (len > 0) { - link_target[len] = '\0'; - pos = strrchr(link_target, '/'); - if (pos != NULL) { - dbg(udev, "cache '%s' with link value '%s'\n", path_full, value); - util_strlcpy(attr->value_local, &pos[1], sizeof(attr->value_local)); - attr->value = attr->value_local; - } - } - goto out; - } - - /* skip directories */ - if (S_ISDIR(statbuf.st_mode)) - goto out; - - /* skip non-readable files */ - if ((statbuf.st_mode & S_IRUSR) == 0) - goto out; - - /* read attribute value */ - fd = open(path_full, O_RDONLY); - if (fd < 0) { - dbg(udev, "attribute '%s' can not be opened\n", path_full); - goto out; - } - size = read(fd, value, sizeof(value)); - close(fd); - if (size < 0) - goto out; - if (size == sizeof(value)) - goto out; - - /* got a valid value, store and return it */ - value[size] = '\0'; - util_remove_trailing_chars(value, '\n'); - dbg(udev, "cache '%s' with attribute value '%s'\n", path_full, value); - util_strlcpy(attr->value_local, value, sizeof(attr->value_local)); - attr->value = attr->value_local; - -out: - return attr->value; -} - -int sysfs_lookup_devpath_by_subsys_id(struct udev *udev, char *devpath_full, size_t len, const char *subsystem, const char *id) -{ - size_t sysfs_len; - char path_full[UTIL_PATH_SIZE]; - char *path; - struct stat statbuf; - - sysfs_len = util_strlcpy(path_full, udev_get_sys_path(udev), sizeof(path_full)); - path = &path_full[sysfs_len]; - - if (strcmp(subsystem, "subsystem") == 0) { - util_strlcpy(path, "/subsystem/", sizeof(path_full) - sysfs_len); - util_strlcat(path, id, sizeof(path_full) - sysfs_len); - if (stat(path_full, &statbuf) == 0) - goto found; - - util_strlcpy(path, "/bus/", sizeof(path_full) - sysfs_len); - util_strlcat(path, id, sizeof(path_full) - sysfs_len); - if (stat(path_full, &statbuf) == 0) - goto found; - goto out; - - util_strlcpy(path, "/class/", sizeof(path_full) - sysfs_len); - util_strlcat(path, id, sizeof(path_full) - sysfs_len); - if (stat(path_full, &statbuf) == 0) - goto found; - } - - if (strcmp(subsystem, "module") == 0) { - util_strlcpy(path, "/module/", sizeof(path_full) - sysfs_len); - util_strlcat(path, id, sizeof(path_full) - sysfs_len); - if (stat(path_full, &statbuf) == 0) - goto found; - goto out; - } - - if (strcmp(subsystem, "drivers") == 0) { - char subsys[UTIL_NAME_SIZE]; - char *driver; - - util_strlcpy(subsys, id, sizeof(subsys)); - driver = strchr(subsys, ':'); - if (driver != NULL) { - driver[0] = '\0'; - driver = &driver[1]; - util_strlcpy(path, "/subsystem/", sizeof(path_full) - sysfs_len); - util_strlcat(path, subsys, sizeof(path_full) - sysfs_len); - util_strlcat(path, "/drivers/", sizeof(path_full) - sysfs_len); - util_strlcat(path, driver, sizeof(path_full) - sysfs_len); - if (stat(path_full, &statbuf) == 0) - goto found; - - util_strlcpy(path, "/bus/", sizeof(path_full) - sysfs_len); - util_strlcat(path, subsys, sizeof(path_full) - sysfs_len); - util_strlcat(path, "/drivers/", sizeof(path_full) - sysfs_len); - util_strlcat(path, driver, sizeof(path_full) - sysfs_len); - if (stat(path_full, &statbuf) == 0) - goto found; - } - goto out; - } - - util_strlcpy(path, "/subsystem/", sizeof(path_full) - sysfs_len); - util_strlcat(path, subsystem, sizeof(path_full) - sysfs_len); - util_strlcat(path, "/devices/", sizeof(path_full) - sysfs_len); - util_strlcat(path, id, sizeof(path_full) - sysfs_len); - if (stat(path_full, &statbuf) == 0) - goto found; - - util_strlcpy(path, "/bus/", sizeof(path_full) - sysfs_len); - util_strlcat(path, subsystem, sizeof(path_full) - sysfs_len); - util_strlcat(path, "/devices/", sizeof(path_full) - sysfs_len); - util_strlcat(path, id, sizeof(path_full) - sysfs_len); - if (stat(path_full, &statbuf) == 0) - goto found; - - util_strlcpy(path, "/class/", sizeof(path_full) - sysfs_len); - util_strlcat(path, subsystem, sizeof(path_full) - sysfs_len); - util_strlcat(path, "/", sizeof(path_full) - sysfs_len); - util_strlcat(path, id, sizeof(path_full) - sysfs_len); - if (stat(path_full, &statbuf) == 0) - goto found; -out: - return 0; -found: - if (S_ISLNK(statbuf.st_mode)) - resolve_sys_link(udev, path, sizeof(path_full) - sysfs_len); - util_strlcpy(devpath_full, path, len); - return 1; -} |