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systemd-stable/udev/lib/libudev-device.c

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31 KiB
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2008-08-28 00:02:41 +04:00
/*
* libudev - interface to udev device information
*
* Copyright (C) 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 <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <dirent.h>
#include <fcntl.h>
#include <ctype.h>
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#include <sys/stat.h>
#include "libudev.h"
#include "libudev-private.h"
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struct udev_device {
int refcount;
struct udev *udev;
struct udev_device *parent_device;
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char *syspath;
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const char *devpath;
char *sysname;
const char *sysnum;
char *devnode;
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char *subsystem;
struct udev_list_node devlinks_list;
int devlinks_uptodate;
struct udev_list_node properties_list;
char *envp[128];
int envp_uptodate;
char *driver;
dev_t devnum;
char *action;
int event_timeout;
char *devpath_old;
char *physdevpath;
int timeout;
unsigned long long int seqnum;
int num_fake_partitions;
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int devlink_priority;
int ignore_remove;
struct udev_list_node attr_list;
int info_loaded;
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};
static size_t devpath_to_db_path(struct udev *udev, const char *devpath, char *filename, size_t len)
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{
size_t start;
/* translate to location of db file */
util_strlcpy(filename, udev_get_dev_path(udev), len);
start = util_strlcat(filename, "/.udev/db/", len);
util_strlcat(filename, devpath, len);
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return util_path_encode(&filename[start], len - start);
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}
static int device_read_db(struct udev_device *udev_device)
{
struct stat stats;
char filename[UTIL_PATH_SIZE];
char line[UTIL_LINE_SIZE];
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FILE *f;
devpath_to_db_path(udev_device->udev, udev_device->devpath, filename, sizeof(filename));
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if (lstat(filename, &stats) != 0) {
info(udev_device->udev, "no db file to read %s: %m\n", filename);
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return -1;
}
if ((stats.st_mode & S_IFMT) == S_IFLNK) {
char target[UTIL_PATH_SIZE];
char devnode[UTIL_PATH_SIZE];
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int target_len;
char *next;
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target_len = readlink(filename, target, sizeof(target));
if (target_len > 0)
target[target_len] = '\0';
else {
info(udev_device->udev, "error reading db link %s: %m\n", filename);
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return -1;
}
next = strchr(target, ' ');
if (next != NULL) {
next[0] = '\0';
next = &next[1];
}
util_strlcpy(devnode, udev_get_dev_path(udev_device->udev), sizeof(devnode));
util_strlcat(devnode, "/", sizeof(devnode));
util_strlcat(devnode, target, sizeof(devnode));
udev_device_set_devnode(udev_device, devnode);
while (next != NULL) {
char devlink[UTIL_PATH_SIZE];
const char *lnk;
lnk = next;
next = strchr(next, ' ');
if (next != NULL) {
next[0] = '\0';
next = &next[1];
}
util_strlcpy(devlink, udev_get_dev_path(udev_device->udev), sizeof(devlink));
util_strlcat(devlink, "/", sizeof(devlink));
util_strlcat(devlink, lnk, sizeof(devlink));
udev_device_add_devlink(udev_device, devlink);
}
info(udev_device->udev, "device %p filled with db symlink data '%s'\n", udev_device, udev_device->devnode);
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return 0;
}
f = fopen(filename, "r");
if (f == NULL) {
info(udev_device->udev, "error reading db file %s: %m\n", filename);
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return -1;
}
while (fgets(line, sizeof(line), f)) {
ssize_t len;
const char *val;
len = strlen(line);
if (len < 4)
break;
line[len-1] = '\0';
val = &line[2];
switch(line[0]) {
case 'N':
util_strlcpy(filename, udev_get_dev_path(udev_device->udev), sizeof(filename));
util_strlcat(filename, "/", sizeof(filename));
util_strlcat(filename, val, sizeof(filename));
udev_device_set_devnode(udev_device, filename);
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break;
case 'S':
util_strlcpy(filename, udev_get_dev_path(udev_device->udev), sizeof(filename));
util_strlcat(filename, "/", sizeof(filename));
util_strlcat(filename, val, sizeof(filename));
udev_device_add_devlink(udev_device, filename);
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break;
case 'L':
udev_device_set_devlink_priority(udev_device, atoi(val));
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break;
case 'T':
udev_device_set_event_timeout(udev_device, atoi(val));
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break;
case 'A':
udev_device_set_num_fake_partitions(udev_device, atoi(val));
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break;
case 'R':
udev_device_set_ignore_remove(udev_device, atoi(val));
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break;
case 'E':
udev_device_add_property_from_string(udev_device, val);
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break;
}
}
fclose(f);
info(udev_device->udev, "device %p filled with db file data\n", udev_device);
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return 0;
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}
int udev_device_read_uevent_file(struct udev_device *udev_device)
{
char filename[UTIL_PATH_SIZE];
FILE *f;
char line[UTIL_LINE_SIZE];
int maj = 0;
int min = 0;
util_strlcpy(filename, udev_device->syspath, sizeof(filename));
util_strlcat(filename, "/uevent", sizeof(filename));
f = fopen(filename, "r");
if (f == NULL)
return -1;
while (fgets(line, sizeof(line), f)) {
char *pos;
pos = strchr(line, '\n');
if (pos == NULL)
continue;
pos[0] = '\0';
if (strncmp(line, "MAJOR=", 6) == 0)
maj = strtoull(&line[6], NULL, 10);
else if (strncmp(line, "MINOR=", 6) == 0)
min = strtoull(&line[6], NULL, 10);
udev_device_add_property_from_string(udev_device, line);
}
udev_device->devnum = makedev(maj, min);
fclose(f);
return 0;
}
static void device_load_info(struct udev_device *device)
{
device->info_loaded = 1;
udev_device_read_uevent_file(device);
device_read_db(device);
}
void udev_device_set_info_loaded(struct udev_device *device)
{
device->info_loaded = 1;
}
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struct udev_device *device_new(struct udev *udev)
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{
struct udev_device *udev_device;
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if (udev == NULL)
return NULL;
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udev_device = malloc(sizeof(struct udev_device));
if (udev_device == NULL)
return NULL;
memset(udev_device, 0x00, sizeof(struct udev_device));
udev_device->refcount = 1;
udev_device->udev = udev;
udev_list_init(&udev_device->devlinks_list);
udev_list_init(&udev_device->properties_list);
udev_list_init(&udev_device->attr_list);
udev_device->event_timeout = -1;
info(udev_device->udev, "udev_device: %p created\n", udev_device);
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return udev_device;
}
/**
* udev_device_new_from_syspath:
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* @udev: udev library context
* @syspath: sys device path including sys directory
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*
* Create new udev device, and fill in information from the sys
* device and the udev database entry. The sypath is the absolute
* path to the device, including the sys mount point.
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*
* The initial refcount is 1, and needs to be decremented to
* release the ressources of the udev device.
*
* Returns: a new udev device, or #NULL, if it does not exist
**/
struct udev_device *udev_device_new_from_syspath(struct udev *udev, const char *syspath)
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{
size_t len;
const char *subdir;
char path[UTIL_PATH_SIZE];
char *pos;
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struct stat statbuf;
struct udev_device *udev_device;
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if (udev == NULL)
return NULL;
if (syspath == NULL)
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return NULL;
/* path starts in sys */
len = strlen(udev_get_sys_path(udev));
if (strncmp(syspath, udev_get_sys_path(udev), len) != 0) {
info(udev, "not in sys :%s\n", syspath);
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return NULL;
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}
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/* path is not a root directory */
subdir = &syspath[len+1];
pos = strrchr(subdir, '/');
if (pos == NULL || pos < &subdir[2]) {
info(udev, "not a subdir :%s\n", syspath);
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return NULL;
}
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/* resolve possible symlink to real path */
util_strlcpy(path, syspath, sizeof(path));
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util_resolve_sys_link(udev, path, sizeof(path));
/* try to resolve the silly block layout if needed */
if (strncmp(&path[len], "/block/", 7) == 0) {
char block[UTIL_PATH_SIZE];
char part[UTIL_PATH_SIZE];
util_strlcpy(block, path, sizeof(block));
pos = strrchr(block, '/');
if (pos == NULL)
return NULL;
util_strlcpy(part, pos, sizeof(part));
pos[0] = '\0';
if (util_resolve_sys_link(udev, block, sizeof(block)) == 0) {
util_strlcpy(path, block, sizeof(path));
util_strlcat(path, part, sizeof(path));
}
}
/* path exists in sys */
if (strncmp(&syspath[len], "/devices/", 9) == 0 ||
strncmp(&syspath[len], "/class/", 7) == 0 ||
strncmp(&syspath[len], "/block/", 7) == 0) {
char file[UTIL_PATH_SIZE];
/* all "devices" require a "uevent" file */
util_strlcpy(file, path, sizeof(file));
util_strlcat(file, "/uevent", sizeof(file));
if (stat(file, &statbuf) != 0) {
info(udev, "not a device: %s\n", syspath);
return NULL;
}
} else {
/* everything else just needs to be a directory */
if (stat(path, &statbuf) != 0 || !S_ISDIR(statbuf.st_mode)) {
info(udev, "directory not found: %s\n", syspath);
return NULL;
}
}
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udev_device = device_new(udev);
if (udev_device == NULL)
return NULL;
udev_device_set_syspath(udev_device, path);
info(udev, "device %p has devpath '%s'\n", udev_device, udev_device_get_devpath(udev_device));
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return udev_device;
}
struct udev_device *udev_device_new_from_devnum(struct udev *udev, char type, dev_t devnum)
{
char path[UTIL_PATH_SIZE];
const char *type_str;
struct udev_enumerate *udev_enumerate;
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struct udev_list_entry *list_entry;
struct udev_device *device = NULL;
if (type == 'b')
type_str = "block";
else if (type == 'c')
type_str = "char";
else
return NULL;
/* /sys/dev/{block,char}/<maj>:<min> link */
snprintf(path, sizeof(path), "%s/dev/%s/%u:%u", udev_get_sys_path(udev),
type_str, major(devnum), minor(devnum));
if (util_resolve_sys_link(udev, path, sizeof(path)) == 0)
return udev_device_new_from_syspath(udev, path);
udev_enumerate = udev_enumerate_new(udev);
if (udev_enumerate == NULL)
return NULL;
/* fallback to search sys devices for the major/minor */
if (type == 'b')
udev_enumerate_add_match_subsystem(udev_enumerate, "block");
else if (type == 'c')
udev_enumerate_add_nomatch_subsystem(udev_enumerate, "block");
udev_enumerate_scan_devices(udev_enumerate);
udev_list_entry_foreach(list_entry, udev_enumerate_get_list_entry(udev_enumerate)) {
struct udev_device *device_loop;
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device_loop = udev_device_new_from_syspath(udev, udev_list_entry_get_name(list_entry));
if (device_loop != NULL) {
if (udev_device_get_devnum(device_loop) == devnum) {
if (type == 'b' && strcmp(udev_device_get_subsystem(device_loop), "block") != 0)
continue;
if (type == 'c' && strcmp(udev_device_get_subsystem(device_loop), "block") == 0)
continue;
device = device_loop;
break;
}
udev_device_unref(device_loop);
}
}
udev_enumerate_unref(udev_enumerate);
return device;
}
struct udev_device *udev_device_new_from_subsystem_sysname(struct udev *udev, const char *subsystem, const char *sysname)
{
size_t sys_path_len;
char path_full[UTIL_PATH_SIZE];
char *path;
struct stat statbuf;
sys_path_len = util_strlcpy(path_full, udev_get_sys_path(udev), sizeof(path_full));
path = &path_full[sys_path_len];
if (strcmp(subsystem, "subsystem") == 0) {
util_strlcpy(path, "/subsystem/", sizeof(path_full) - sys_path_len);
util_strlcat(path, sysname, sizeof(path_full) - sys_path_len);
if (stat(path_full, &statbuf) == 0)
goto found;
util_strlcpy(path, "/bus/", sizeof(path_full) - sys_path_len);
util_strlcat(path, sysname, sizeof(path_full) - sys_path_len);
if (stat(path_full, &statbuf) == 0)
goto found;
util_strlcpy(path, "/class/", sizeof(path_full) - sys_path_len);
util_strlcat(path, sysname, sizeof(path_full) - sys_path_len);
if (stat(path_full, &statbuf) == 0)
goto found;
goto out;
}
if (strcmp(subsystem, "module") == 0) {
util_strlcpy(path, "/module/", sizeof(path_full) - sys_path_len);
util_strlcat(path, sysname, sizeof(path_full) - sys_path_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, sysname, sizeof(subsys));
driver = strchr(subsys, ':');
if (driver != NULL) {
driver[0] = '\0';
driver = &driver[1];
util_strlcpy(path, "/subsystem/", sizeof(path_full) - sys_path_len);
util_strlcat(path, subsys, sizeof(path_full) - sys_path_len);
util_strlcat(path, "/drivers/", sizeof(path_full) - sys_path_len);
util_strlcat(path, driver, sizeof(path_full) - sys_path_len);
if (stat(path_full, &statbuf) == 0)
goto found;
util_strlcpy(path, "/bus/", sizeof(path_full) - sys_path_len);
util_strlcat(path, subsys, sizeof(path_full) - sys_path_len);
util_strlcat(path, "/drivers/", sizeof(path_full) - sys_path_len);
util_strlcat(path, driver, sizeof(path_full) - sys_path_len);
if (stat(path_full, &statbuf) == 0)
goto found;
}
goto out;
}
util_strlcpy(path, "/subsystem/", sizeof(path_full) - sys_path_len);
util_strlcat(path, subsystem, sizeof(path_full) - sys_path_len);
util_strlcat(path, "/devices/", sizeof(path_full) - sys_path_len);
util_strlcat(path, sysname, sizeof(path_full) - sys_path_len);
if (stat(path_full, &statbuf) == 0)
goto found;
util_strlcpy(path, "/bus/", sizeof(path_full) - sys_path_len);
util_strlcat(path, subsystem, sizeof(path_full) - sys_path_len);
util_strlcat(path, "/devices/", sizeof(path_full) - sys_path_len);
util_strlcat(path, sysname, sizeof(path_full) - sys_path_len);
if (stat(path_full, &statbuf) == 0)
goto found;
util_strlcpy(path, "/class/", sizeof(path_full) - sys_path_len);
util_strlcat(path, subsystem, sizeof(path_full) - sys_path_len);
util_strlcat(path, "/", sizeof(path_full) - sys_path_len);
util_strlcat(path, sysname, sizeof(path_full) - sys_path_len);
if (stat(path_full, &statbuf) == 0)
goto found;
out:
return NULL;
found:
return udev_device_new_from_syspath(udev, path_full);
}
static struct udev_device *device_new_from_parent(struct udev_device *udev_device)
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{
struct udev_device *udev_device_parent = NULL;
char path[UTIL_PATH_SIZE];
const char *subdir;
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/* follow "device" link in deprecated sys layout */
if (strncmp(udev_device->devpath, "/class/", 7) == 0 ||
strncmp(udev_device->devpath, "/block/", 7) == 0) {
util_strlcpy(path, udev_device->syspath, sizeof(path));
util_strlcat(path, "/device", sizeof(path));
if (util_resolve_sys_link(udev_device->udev, path, sizeof(path)) == 0)
udev_device_parent = udev_device_new_from_syspath(udev_device->udev, path);
return udev_device_parent;
}
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util_strlcpy(path, udev_device->syspath, sizeof(path));
subdir = &path[strlen(udev_get_sys_path(udev_device->udev))+1];
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while (1) {
char *pos;
pos = strrchr(subdir, '/');
if (pos == NULL || pos < &subdir[2])
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break;
pos[0] = '\0';
udev_device_parent = udev_device_new_from_syspath(udev_device->udev, path);
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if (udev_device_parent != NULL)
return udev_device_parent;
}
return NULL;
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}
struct udev_device *udev_device_get_parent(struct udev_device *udev_device)
{
if (udev_device == NULL)
return NULL;
if (udev_device->parent_device != NULL) {
info(udev_device->udev, "returning existing parent %p\n", udev_device->parent_device);
return udev_device->parent_device;
}
udev_device->parent_device = device_new_from_parent(udev_device);
return udev_device->parent_device;
}
struct udev_device *udev_device_get_parent_with_subsystem(struct udev_device *udev_device, const char *subsystem)
{
struct udev_device *parent;
parent = udev_device_get_parent(udev_device);
while (parent != NULL) {
const char *parent_subsystem;
parent_subsystem = udev_device_get_subsystem(parent);
if (parent_subsystem != NULL && strcmp(parent_subsystem, subsystem) == 0)
break;
parent = udev_device_get_parent(parent);
}
return parent;
}
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/**
* udev_device_get_udev:
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* @udev_device: udev device
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*
* Retrieve the udev library context the device was created with.
*
* Returns: the udev library context
**/
struct udev *udev_device_get_udev(struct udev_device *udev_device)
{
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if (udev_device == NULL)
return NULL;
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return udev_device->udev;
}
/**
* udev_device_ref:
* @udev_device: udev device
*
* Take a reference of a udev device.
*
* Returns: the passed udev device
**/
struct udev_device *udev_device_ref(struct udev_device *udev_device)
{
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if (udev_device == NULL)
return NULL;
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udev_device->refcount++;
return udev_device;
}
/**
* udev_device_unref:
* @udev_device: udev device
*
* Drop a reference of a udev device. If the refcount reaches zero,
* the ressources of the device will be released.
*
**/
void udev_device_unref(struct udev_device *udev_device)
{
unsigned int i;
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if (udev_device == NULL)
return;
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udev_device->refcount--;
if (udev_device->refcount > 0)
return;
if (udev_device->parent_device != NULL)
udev_device_unref(udev_device->parent_device);
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free(udev_device->syspath);
free(udev_device->sysname);
free(udev_device->devnode);
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free(udev_device->subsystem);
udev_list_cleanup(udev_device->udev, &udev_device->devlinks_list);
udev_list_cleanup(udev_device->udev, &udev_device->properties_list);
free(udev_device->action);
free(udev_device->driver);
free(udev_device->devpath_old);
free(udev_device->physdevpath);
udev_list_cleanup(udev_device->udev, &udev_device->attr_list);
for (i = 0; i < ARRAY_SIZE(udev_device->envp) && udev_device->envp[i] != NULL; i++)
free(udev_device->envp[i]);
info(udev_device->udev, "udev_device: %p released\n", udev_device);
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free(udev_device);
}
/**
* udev_device_get_devpath:
* @udev_device: udev device
*
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* Retrieve the kernel devpath value of the udev device. The path
* does not contain the sys mount point, and starts with a '/'.
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*
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* Returns: the devpath of the udev device
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**/
const char *udev_device_get_devpath(struct udev_device *udev_device)
{
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if (udev_device == NULL)
return NULL;
return udev_device->devpath;
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}
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/**
* udev_device_get_syspath:
* @udev_device: udev device
*
* Retrieve the sys path of the udev device. The path is an
* absolute path and starts with the sys mount point.
*
* Returns: the sys path of the udev device
**/
const char *udev_device_get_syspath(struct udev_device *udev_device)
{
if (udev_device == NULL)
return NULL;
return udev_device->syspath;
}
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const char *udev_device_get_sysname(struct udev_device *udev_device)
{
if (udev_device == NULL)
return NULL;
return udev_device->sysname;
}
const char *udev_device_get_sysnum(struct udev_device *udev_device)
{
if (udev_device == NULL)
return NULL;
return udev_device->sysnum;
}
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/**
* udev_device_get_devnode:
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* @udev_device: udev device
*
* Retrieve the device node file name belonging to the udev device.
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* The path is an absolute path, and starts with the device directory.
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*
* Returns: the device node file name of the udev device, or #NULL if no device node exists
**/
const char *udev_device_get_devnode(struct udev_device *udev_device)
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{
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if (udev_device == NULL)
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return NULL;
if (!udev_device->info_loaded)
device_load_info(udev_device);
return udev_device->devnode;
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}
/**
* udev_device_get_subsystem:
* @udev_device: udev device
*
* Retrieve the subsystem string of the udev device. The string does not
* contain any "/".
*
* Returns: the subsystem name of the udev device, or #NULL if it can not be determined
**/
const char *udev_device_get_subsystem(struct udev_device *udev_device)
{
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char subsystem[UTIL_NAME_SIZE];
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if (udev_device == NULL)
return NULL;
if (udev_device->subsystem != NULL)
return udev_device->subsystem;
/* read "subsytem" link */
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if (util_get_sys_subsystem(udev_device->udev, udev_device->syspath, subsystem, sizeof(subsystem)) > 0) {
udev_device->subsystem = strdup(subsystem);
return udev_device->subsystem;
}
/* implicit names */
if (strncmp(udev_device->devpath, "/module/", 8) == 0) {
udev_device->subsystem = strdup("module");
return udev_device->subsystem;
}
if (strstr(udev_device->devpath, "/drivers/") != NULL) {
udev_device->subsystem = strdup("drivers");
return udev_device->subsystem;
}
if (strncmp(udev_device->devpath, "/subsystem/", 11) == 0 ||
strncmp(udev_device->devpath, "/class/", 7) == 0 ||
strncmp(udev_device->devpath, "/bus/", 5) == 0) {
udev_device->subsystem = strdup("subsystem");
return udev_device->subsystem;
}
return NULL;
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}
/**
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* udev_device_get_devlinks_list_entry:
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* @udev_device: udev device
*
* Retrieve the list of device links pointing to the device file of
* the udev device. The next list entry can be retrieved with
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* udev_list_entry_next(), which returns #NULL if no more entries exist.
* The devlink path can be retrieved from the list entry by
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* udev_list_entry_get_name(). The path is an absolute path, and starts with
* the device directory.
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*
* Returns: the first entry of the device node link list
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**/
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struct udev_list_entry *udev_device_get_devlinks_list_entry(struct udev_device *udev_device)
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{
if (udev_device == NULL)
return NULL;
if (!udev_device->info_loaded)
device_load_info(udev_device);
return udev_list_get_entry(&udev_device->devlinks_list);
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}
void udev_device_cleanup_devlinks_list(struct udev_device *udev_device)
{
udev_device->devlinks_uptodate = 0;
udev_list_cleanup(udev_device->udev, &udev_device->devlinks_list);
}
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/**
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* udev_device_get_properties_list_entry:
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* @udev_device: udev device
*
* Retrieve the list of key/value device properties of the udev
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* device. The next list entry can be retrieved with udev_list_entry_next(),
* which returns #NULL if no more entries exist. The property name
* can be retrieved from the list entry by udev_list_get_name(),
* the property value by udev_list_get_value().
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*
* Returns: the first entry of the property list
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**/
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struct udev_list_entry *udev_device_get_properties_list_entry(struct udev_device *udev_device)
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{
if (udev_device == NULL)
return NULL;
if (!udev_device->info_loaded)
device_load_info(udev_device);
if (!udev_device->devlinks_uptodate) {
char symlinks[UTIL_PATH_SIZE];
struct udev_list_entry *list_entry;
udev_device->devlinks_uptodate = 1;
list_entry = udev_device_get_devlinks_list_entry(udev_device);
if (list_entry != NULL) {
util_strlcpy(symlinks, udev_list_entry_get_name(list_entry), sizeof(symlinks));
udev_list_entry_foreach(list_entry, udev_list_entry_get_next(list_entry)) {
util_strlcat(symlinks, " ", sizeof(symlinks));
util_strlcat(symlinks, udev_list_entry_get_name(list_entry), sizeof(symlinks));
}
udev_device_add_property(udev_device, "DEVLINKS", symlinks);
}
}
return udev_list_get_entry(&udev_device->properties_list);
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}
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const char *udev_device_get_driver(struct udev_device *udev_device)
{
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char driver[UTIL_NAME_SIZE];
if (udev_device == NULL)
return NULL;
if (udev_device->driver != NULL)
return udev_device->driver;
if (util_get_sys_driver(udev_device->udev, udev_device->syspath, driver, sizeof(driver)) < 2)
return NULL;
udev_device->driver = strdup(driver);
return udev_device->driver;
}
dev_t udev_device_get_devnum(struct udev_device *udev_device)
{
if (udev_device == NULL)
return makedev(0, 0);
if (!udev_device->info_loaded)
device_load_info(udev_device);
return udev_device->devnum;
}
const char *udev_device_get_action(struct udev_device *udev_device)
{
if (udev_device == NULL)
return NULL;
return udev_device->action;
}
unsigned long long int udev_device_get_seqnum(struct udev_device *udev_device)
{
if (udev_device == NULL)
return 0;
return udev_device->seqnum;
}
const char *udev_device_get_attr_value(struct udev_device *udev_device, const char *attr)
{
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struct udev_list_entry *list_entry;
char path[UTIL_PATH_SIZE];
char value[UTIL_NAME_SIZE];
struct stat statbuf;
int fd;
ssize_t size;
const char *val = NULL;
if (udev_device == NULL)
return NULL;
if (attr == NULL)
return NULL;
/* look for possibly already cached result */
udev_list_entry_foreach(list_entry, udev_list_get_entry(&udev_device->attr_list)) {
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if (strcmp(udev_list_entry_get_name(list_entry), attr) == 0) {
info(udev_device->udev, "got '%s' (%s) from cache\n",
attr, udev_list_entry_get_value(list_entry));
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return udev_list_entry_get_value(list_entry);
}
}
util_strlcpy(path, udev_device_get_syspath(udev_device), sizeof(path));
util_strlcat(path, "/", sizeof(path));
util_strlcat(path, attr, sizeof(path));
if (lstat(path, &statbuf) != 0) {
info(udev_device->udev, "stat '%s' failed: %m\n", path);
goto out;
}
if (S_ISLNK(statbuf.st_mode)) {
/* links return the last element of the target path */
char target[UTIL_NAME_SIZE];
int len;
char *pos;
len = readlink(path, target, sizeof(target));
if (len > 0) {
target[len] = '\0';
pos = strrchr(target, '/');
if (pos != NULL) {
pos = &pos[1];
info(udev_device->udev, "cache '%s' with link value '%s'\n", attr, pos);
list_entry = udev_list_entry_add(udev_device->udev, &udev_device->attr_list, attr, pos, 0, 0);
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val = udev_list_entry_get_value(list_entry);
}
}
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, O_RDONLY);
if (fd < 0) {
info(udev_device->udev, "attribute '%s' can not be opened\n", path);
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 it in cache and return it */
value[size] = '\0';
util_remove_trailing_chars(value, '\n');
info(udev_device->udev, "'%s' has attribute value '%s'\n", path, value);
list_entry = udev_list_entry_add(udev_device->udev, &udev_device->attr_list, attr, value, 0, 0);
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val = udev_list_entry_get_value(list_entry);
out:
return val;
}
int udev_device_set_syspath(struct udev_device *udev_device, const char *syspath)
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{
const char *pos;
size_t len;
free(udev_device->syspath);
udev_device->syspath = strdup(syspath);
if (udev_device->syspath == NULL)
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return -ENOMEM;
udev_device->devpath = &udev_device->syspath[strlen(udev_get_sys_path(udev_device->udev))];
udev_device_add_property(udev_device, "DEVPATH", udev_device->devpath);
pos = strrchr(udev_device->syspath, '/');
if (pos == NULL)
return -EINVAL;
udev_device->sysname = strdup(&pos[1]);
if (udev_device->sysname == NULL)
return -ENOMEM;
/* some devices have '!' in their name, change that to '/' */
len = 0;
while (udev_device->sysname[len] != '\0') {
if (udev_device->sysname[len] == '!')
udev_device->sysname[len] = '/';
len++;
}
/* trailing number */
while (isdigit(udev_device->sysname[--len]))
udev_device->sysnum = &udev_device->sysname[len];
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return 0;
}
int udev_device_set_subsystem(struct udev_device *udev_device, const char *subsystem)
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{
free(udev_device->subsystem);
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udev_device->subsystem = strdup(subsystem);
if (udev_device->subsystem == NULL)
return -ENOMEM;
udev_device_add_property(udev_device, "SUBSYSTEM", udev_device->subsystem);
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return 0;
}
int udev_device_set_devnode(struct udev_device *udev_device, const char *devnode)
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{
free(udev_device->devnode);
udev_device->devnode = strdup(devnode);
if (devnode == NULL)
return 0;
if (udev_device->devnode == NULL)
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return -ENOMEM;
udev_device_add_property(udev_device, "DEVNAME", udev_device->devnode);
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return 0;
}
int udev_device_add_devlink(struct udev_device *udev_device, const char *devlink)
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{
udev_device->devlinks_uptodate = 0;
if (udev_list_entry_add(udev_device->udev, &udev_device->devlinks_list, devlink, NULL, 1, 0) == NULL)
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return -ENOMEM;
return 0;
}
struct udev_list_entry *udev_device_add_property(struct udev_device *udev_device, const char *key, const char *value)
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{
udev_device->envp_uptodate = 0;
return udev_list_entry_add(udev_device->udev, &udev_device->properties_list, key, value, 1, 0);
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}
struct udev_list_entry *udev_device_add_property_from_string(struct udev_device *udev_device, const char *property)
{
char name[UTIL_PATH_SIZE];
char *val;
strncpy(name, property, sizeof(name));
val = strchr(name, '=');
if (val == NULL)
return NULL;
val[0] = '\0';
val = &val[1];
if (val[0] == '\0')
val = NULL;
return udev_device_add_property(udev_device, name, val);
}
char **udev_device_get_properties_envp(struct udev_device *udev_device)
{
if (!udev_device->envp_uptodate) {
unsigned int i;
struct udev_list_entry *list_entry;
for (i = 0; i < ARRAY_SIZE(udev_device->envp) && udev_device->envp[i] != NULL; i++)
free(udev_device->envp[i]);
i = 0;
udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device)) {
asprintf(&udev_device->envp[i++], "%s=%s",
udev_list_entry_get_name(list_entry),
udev_list_entry_get_value(list_entry));
if (i+1 >= ARRAY_SIZE(udev_device->envp))
break;
}
udev_device->envp[i] = NULL;
info(udev_device->udev, "constructed envp from %u properties\n", i);
udev_device->envp_uptodate = 1;
}
return udev_device->envp;
}
int udev_device_set_action(struct udev_device *udev_device, const char *action)
{
free(udev_device->action);
udev_device->action = strdup(action);
if (udev_device->action == NULL)
return -ENOMEM;
udev_device_add_property(udev_device, "ACTION", action);
return 0;
}
int udev_device_set_driver(struct udev_device *udev_device, const char *driver)
{
free(udev_device->driver);
udev_device->driver = strdup(driver);
if (udev_device->driver == NULL)
return -ENOMEM;
return 0;
}
const char *udev_device_get_devpath_old(struct udev_device *udev_device)
{
return udev_device->devpath_old;
}
int udev_device_set_devpath_old(struct udev_device *udev_device, const char *devpath_old)
{
udev_device->devpath_old = strdup(devpath_old);
if (udev_device->devpath_old == NULL)
return -ENOMEM;
return 0;
}
const char *udev_device_get_physdevpath(struct udev_device *udev_device)
{
return udev_device->physdevpath;
}
int udev_device_set_physdevpath(struct udev_device *udev_device, const char *physdevpath)
{
udev_device->physdevpath = strdup(physdevpath);
if (udev_device->physdevpath == NULL)
return -ENOMEM;
return 0;
}
int udev_device_get_timeout(struct udev_device *udev_device)
{
return udev_device->timeout;
}
int udev_device_set_timeout(struct udev_device *udev_device, int timeout)
{
udev_device->timeout = timeout;
return 0;
}
int udev_device_get_event_timeout(struct udev_device *udev_device)
{
if (!udev_device->info_loaded)
device_load_info(udev_device);
return udev_device->event_timeout;
}
int udev_device_set_event_timeout(struct udev_device *udev_device, int event_timeout)
{
udev_device->event_timeout = event_timeout;
return 0;
}
int udev_device_set_seqnum(struct udev_device *udev_device, unsigned long long int seqnum)
{
udev_device->seqnum = seqnum;
return 0;
}
int udev_device_set_devnum(struct udev_device *udev_device, dev_t devnum)
{
udev_device->devnum = devnum;
return 0;
}
int udev_device_get_num_fake_partitions(struct udev_device *udev_device)
{
if (!udev_device->info_loaded)
device_load_info(udev_device);
return udev_device->num_fake_partitions;
}
int udev_device_set_num_fake_partitions(struct udev_device *udev_device, int num)
{
udev_device->num_fake_partitions = num;
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return 0;
}
int udev_device_get_devlink_priority(struct udev_device *udev_device)
{
if (!udev_device->info_loaded)
device_load_info(udev_device);
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return udev_device->devlink_priority;
}
int udev_device_set_devlink_priority(struct udev_device *udev_device, int prio)
{
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udev_device->devlink_priority = prio;
return 0;
}
int udev_device_get_ignore_remove(struct udev_device *udev_device)
{
if (!udev_device->info_loaded)
device_load_info(udev_device);
return udev_device->ignore_remove;
}
int udev_device_set_ignore_remove(struct udev_device *udev_device, int ignore)
{
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udev_device->ignore_remove = ignore;
return 0;
}