/*
* libudev - interface to udev device information
*
- * Copyright (C) 2008-2009 Kay Sievers <kay.sievers@vrfy.org>
+ * Copyright (C) 2008-2010 Kay Sievers <kay.sievers@vrfy.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
#include <stdlib.h>
#include <stddef.h>
#include <unistd.h>
+#include <stdbool.h>
#include <errno.h>
#include <string.h>
#include <dirent.h>
#include "libudev.h"
#include "libudev-private.h"
+/**
+ * SECTION:libudev-device
+ * @short_description: kernel sys devices
+ *
+ * Representation of kernel sys devices. Devices are uniquely identified
+ * by their syspath, every device has exactly one path in the kernel sys
+ * filesystem. Devices usually belong to a kernel subsystem, and and have
+ * a unique name inside that subsystem.
+ */
+
+/**
+ * udev_device:
+ *
+ * Opaque object representing one kernel sys device.
+ */
struct udev_device {
struct udev *udev;
struct udev_device *parent_device;
char *driver;
char *action;
char *devpath_old;
+ char *sysname_old;
char *knodename;
+ char *id_filename;
char **envp;
char *monitor_buf;
size_t monitor_buf_len;
struct udev_list_node devlinks_list;
struct udev_list_node properties_list;
struct udev_list_node sysattr_list;
+ struct udev_list_node tags_list;
unsigned long long int seqnum;
int event_timeout;
int timeout;
- int num_fake_partitions;
int devlink_priority;
int refcount;
dev_t devnum;
+ int ifindex;
int watch_handle;
- unsigned int parent_set:1;
- unsigned int subsystem_set:1;
- unsigned int devtype_set:1;
- unsigned int devlinks_uptodate:1;
- unsigned int envp_uptodate:1;
- unsigned int driver_set:1;
- unsigned int info_loaded:1;
- unsigned int ignore_remove:1;
+ int maj, min;
+ bool parent_set;
+ bool subsystem_set;
+ bool devtype_set;
+ bool devlinks_uptodate;
+ bool envp_uptodate;
+ bool tags_uptodate;
+ bool driver_set;
+ bool info_loaded;
+ bool db_loaded;
+ bool uevent_loaded;
+ bool is_initialized;
};
-static size_t devpath_to_db_path(struct udev *udev, const char *devpath, char *filename, size_t len)
+struct udev_list_entry *udev_device_add_property(struct udev_device *udev_device, const char *key, const char *value)
{
- char *s;
- size_t l;
+ udev_device->envp_uptodate = false;
+ if (value == NULL) {
+ struct udev_list_entry *list_entry;
- s = filename;
- l = util_strpcpyl(&s, len, udev_get_dev_path(udev), "/.udev/db/", NULL);
- return util_path_encode(devpath, s, l);
+ list_entry = udev_device_get_properties_list_entry(udev_device);
+ list_entry = udev_list_entry_get_by_name(list_entry, key);
+ if (list_entry != NULL)
+ udev_list_entry_delete(list_entry);
+ return NULL;
+ }
+ return udev_list_entry_add(udev_device->udev, &udev_device->properties_list, key, value, 1, 0);
}
-int udev_device_read_db(struct udev_device *udev_device)
+static struct udev_list_entry *udev_device_add_property_from_string(struct udev_device *udev_device, const char *property)
{
- struct stat stats;
- char filename[UTIL_PATH_SIZE];
- char line[UTIL_LINE_SIZE];
- FILE *f;
+ char name[UTIL_LINE_SIZE];
+ char *val;
- devpath_to_db_path(udev_device->udev, udev_device->devpath, filename, sizeof(filename));
+ util_strscpy(name, sizeof(name), property);
+ 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);
+}
- if (lstat(filename, &stats) != 0) {
- dbg(udev_device->udev, "no db file to read %s: %m\n", filename);
- return -1;
- }
- if ((stats.st_mode & S_IFMT) == S_IFLNK) {
- char target[UTIL_PATH_SIZE];
- char devnode[UTIL_PATH_SIZE];
- int target_len;
+/*
+ * parse property string, and if needed, update internal values accordingly
+ *
+ * udev_device_add_property_from_string_parse_finish() needs to be
+ * called after adding properties, and its return value checked
+ *
+ * udev_device_set_info_loaded() needs to be set, to avoid trying
+ * to use a device without a DEVPATH set
+ */
+void udev_device_add_property_from_string_parse(struct udev_device *udev_device, const char *property)
+{
+ if (strncmp(property, "DEVPATH=", 8) == 0) {
+ char path[UTIL_PATH_SIZE];
+
+ util_strscpyl(path, sizeof(path), udev_get_sys_path(udev_device->udev), &property[8], NULL);
+ udev_device_set_syspath(udev_device, path);
+ } else if (strncmp(property, "SUBSYSTEM=", 10) == 0) {
+ udev_device_set_subsystem(udev_device, &property[10]);
+ } else if (strncmp(property, "DEVTYPE=", 8) == 0) {
+ udev_device_set_devtype(udev_device, &property[8]);
+ } else if (strncmp(property, "DEVNAME=", 8) == 0) {
+ if (property[8] == '/')
+ udev_device_set_devnode(udev_device, &property[8]);
+ else
+ udev_device_set_knodename(udev_device, &property[8]);
+ } else if (strncmp(property, "DEVLINKS=", 9) == 0) {
+ char devlinks[UTIL_PATH_SIZE];
+ char *slink;
char *next;
- target_len = readlink(filename, target, sizeof(target));
- if (target_len > 0)
- target[target_len] = '\0';
- else {
- dbg(udev_device->udev, "error reading db link %s: %m\n", filename);
- return -1;
- }
-
- next = strchr(target, ' ');
- if (next != NULL) {
+ util_strscpy(devlinks, sizeof(devlinks), &property[9]);
+ slink = devlinks;
+ next = strchr(slink, ' ');
+ while (next != NULL) {
next[0] = '\0';
- next = &next[1];
+ udev_device_add_devlink(udev_device, slink, 0);
+ slink = &next[1];
+ next = strchr(slink, ' ');
}
- util_strscpyl(devnode, sizeof(devnode), udev_get_dev_path(udev_device->udev), "/", target, NULL);
- udev_device_set_devnode(udev_device, devnode);
- while (next != NULL) {
- char devlink[UTIL_PATH_SIZE];
- const char *lnk;
+ if (slink[0] != '\0')
+ udev_device_add_devlink(udev_device, slink, 0);
+ } else if (strncmp(property, "TAGS=", 5) == 0) {
+ char tags[UTIL_PATH_SIZE];
+ char *next;
- lnk = next;
- next = strchr(next, ' ');
- if (next != NULL) {
+ util_strscpy(tags, sizeof(tags), &property[5]);
+ next = strchr(tags, ':');
+ if (next != NULL) {
+ next++;
+ while (next[0] != '\0') {
+ char *tag;
+
+ tag = next;
+ next = strchr(tag, ':');
+ if (next == NULL)
+ break;
next[0] = '\0';
- next = &next[1];
+ next++;
+ udev_device_add_tag(udev_device, tag);
}
- util_strscpyl(devlink, sizeof(devlink), udev_get_dev_path(udev_device->udev), "/", lnk, NULL);
- 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);
- return 0;
+ } else if (strncmp(property, "DRIVER=", 7) == 0) {
+ udev_device_set_driver(udev_device, &property[7]);
+ } else if (strncmp(property, "ACTION=", 7) == 0) {
+ udev_device_set_action(udev_device, &property[7]);
+ } else if (strncmp(property, "MAJOR=", 6) == 0) {
+ udev_device->maj = strtoull(&property[6], NULL, 10);
+ } else if (strncmp(property, "MINOR=", 6) == 0) {
+ udev_device->min = strtoull(&property[6], NULL, 10);
+ } else if (strncmp(property, "DEVPATH_OLD=", 12) == 0) {
+ udev_device_set_devpath_old(udev_device, &property[12]);
+ } else if (strncmp(property, "SEQNUM=", 7) == 0) {
+ udev_device_set_seqnum(udev_device, strtoull(&property[7], NULL, 10));
+ } else if (strncmp(property, "TIMEOUT=", 8) == 0) {
+ udev_device_set_timeout(udev_device, strtoull(&property[8], NULL, 10));
+ } else if (strncmp(property, "IFINDEX=", 8) == 0) {
+ udev_device_set_ifindex(udev_device, strtoull(&property[8], NULL, 10));
+ } else {
+ udev_device_add_property_from_string(udev_device, property);
}
+}
+
+int udev_device_add_property_from_string_parse_finish(struct udev_device *udev_device)
+{
+ if (udev_device->maj > 0)
+ udev_device_set_devnum(udev_device, makedev(udev_device->maj, udev_device->min));
+ udev_device->maj = 0;
+ udev_device->min = 0;
+
+ if (udev_device->devpath == NULL || udev_device->subsystem == NULL)
+ return -EINVAL;
+ return 0;
+}
+
+/**
+ * udev_device_get_property_value:
+ * @udev_device: udev device
+ * @key: property name
+ *
+ * Returns: the value of a device property, or #NULL if there is no such property.
+ **/
+const char *udev_device_get_property_value(struct udev_device *udev_device, const char *key)
+{
+ struct udev_list_entry *list_entry;
+
+ if (udev_device == NULL)
+ return NULL;
+ if (key == NULL)
+ return NULL;
+
+ list_entry = udev_device_get_properties_list_entry(udev_device);
+ list_entry = udev_list_entry_get_by_name(list_entry, key);
+ return udev_list_entry_get_value(list_entry);
+}
+
+int udev_device_read_db(struct udev_device *udev_device)
+{
+ const char *id;
+ char filename[UTIL_PATH_SIZE];
+ char line[UTIL_LINE_SIZE];
+ FILE *f;
- f = fopen(filename, "r");
+ if (udev_device->db_loaded)
+ return 0;
+ udev_device->db_loaded = true;
+
+ id = udev_device_get_id_filename(udev_device);
+ if (id == NULL)
+ return -1;
+ util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev_device->udev), "/.udev/db/", id, NULL);
+ f = fopen(filename, "re");
if (f == NULL) {
- dbg(udev_device->udev, "error reading db file %s: %m\n", filename);
+ info(udev_device->udev, "no db file to read %s: %m\n", filename);
return -1;
}
+ udev_device->is_initialized = true;
+
while (fgets(line, sizeof(line), f)) {
ssize_t len;
const char *val;
+ struct udev_list_entry *entry;
len = strlen(line);
if (len < 4)
break;
case 'S':
util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev_device->udev), "/", val, NULL);
- udev_device_add_devlink(udev_device, filename);
+ udev_device_add_devlink(udev_device, filename, 0);
break;
case 'L':
udev_device_set_devlink_priority(udev_device, atoi(val));
break;
- case 'T':
- udev_device_set_event_timeout(udev_device, atoi(val));
- break;
- case 'A':
- udev_device_set_num_fake_partitions(udev_device, atoi(val));
- break;
- case 'R':
- udev_device_set_ignore_remove(udev_device, atoi(val));
- break;
case 'E':
- udev_device_add_property_from_string(udev_device, val);
+ entry = udev_device_add_property_from_string(udev_device, val);
+ udev_list_entry_set_flags(entry, 1);
+ break;
+ case 'G':
+ udev_device_add_tag(udev_device, val);
break;
case 'W':
udev_device_set_watch_handle(udev_device, atoi(val));
int maj = 0;
int min = 0;
+ if (udev_device->uevent_loaded)
+ return 0;
+
util_strscpyl(filename, sizeof(filename), udev_device->syspath, "/uevent", NULL);
- f = fopen(filename, "r");
+ f = fopen(filename, "re");
if (f == NULL)
return -1;
+ udev_device->uevent_loaded = true;
while (fgets(line, sizeof(line), f)) {
char *pos;
maj = strtoull(&line[6], NULL, 10);
else if (strncmp(line, "MINOR=", 6) == 0)
min = strtoull(&line[6], NULL, 10);
+ else if (strncmp(line, "IFINDEX=", 8) == 0)
+ udev_device_set_ifindex(udev_device, strtoull(&line[8], NULL, 10));
else if (strncmp(line, "DEVNAME=", 8) == 0)
udev_device_set_knodename(udev_device, &line[8]);
}
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);
- udev_device_read_db(device);
-}
-
void udev_device_set_info_loaded(struct udev_device *device)
{
- device->info_loaded = 1;
+ device->info_loaded = true;
}
struct udev_device *udev_device_new(struct udev *udev)
udev_list_init(&udev_device->devlinks_list);
udev_list_init(&udev_device->properties_list);
udev_list_init(&udev_device->sysattr_list);
+ udev_list_init(&udev_device->tags_list);
udev_device->event_timeout = -1;
udev_device->watch_handle = -1;
/* copy global properties */
* @syspath: sys device path including sys directory
*
* Create new udev device, and fill in information from the sys
- * device and the udev database entry. The sypath is the absolute
+ * device and the udev database entry. The syspath is the absolute
* path to the device, including the sys mount point.
*
* The initial refcount is 1, and needs to be decremented to
util_strscpy(path, sizeof(path), syspath);
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_strscpy(block, sizeof(block), path);
- pos = strrchr(block, '/');
- if (pos == NULL)
- return NULL;
- util_strscpy(part, sizeof(part), pos);
- pos[0] = '\0';
- if (util_resolve_sys_link(udev, block, sizeof(block)) == 0)
- util_strscpyl(path, sizeof(path), block, part, NULL);
- }
-
- /* path exists in sys */
- if (strncmp(&syspath[len], "/devices/", 9) == 0 ||
- strncmp(&syspath[len], "/class/", 7) == 0 ||
- strncmp(&syspath[len], "/block/", 7) == 0) {
+ if (strncmp(&path[len], "/devices/", 9) == 0) {
char file[UTIL_PATH_SIZE];
/* all "devices" require a "uevent" file */
return udev_device;
}
+/**
+ * udev_device_new_from_devnum:
+ * @udev: udev library context
+ * @type: char or block device
+ * @devnum: device major/minor number
+ *
+ * Create new udev device, and fill in information from the sys
+ * device and the udev database entry. The device is looked-up
+ * by its major/minor number and type. Character and block device
+ * numbers are not unique across the two types.
+ *
+ * The initial refcount is 1, and needs to be decremented to
+ * release the resources of the udev device.
+ *
+ * Returns: a new udev device, or #NULL, if it does not exist
+ **/
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;
- struct udev_list_entry *list_entry;
- struct udev_device *device = NULL;
if (type == 'b')
type_str = "block";
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);
+ /* use /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));
+ return udev_device_new_from_syspath(udev, path);
+}
- udev_enumerate = udev_enumerate_new(udev);
- if (udev_enumerate == NULL)
- return NULL;
+struct udev_device *udev_device_new_from_id_filename(struct udev *udev, char *id)
+{
+ char type;
+ int maj, min;
+ char subsys[UTIL_PATH_SIZE];
+ char *sysname;
- /* 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;
-
- 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);
- }
+ switch(id[0]) {
+ case 'b':
+ case 'c':
+ if (sscanf(id, "%c%i:%i", &type, &maj, &min) != 3)
+ return NULL;
+ return udev_device_new_from_devnum(udev, type, makedev(maj, min));
+ case '+':
+ util_strscpy(subsys, sizeof(subsys), &id[1]);
+ sysname = strchr(subsys, ':');
+ if (sysname == NULL)
+ return NULL;
+ sysname[0] = '\0';
+ sysname = &sysname[1];
+ return udev_device_new_from_subsystem_sysname(udev, subsys, sysname);
+ default:
+ return NULL;
}
- udev_enumerate_unref(udev_enumerate);
- return device;
}
+/**
+ * udev_device_new_from_subsystem_sysname:
+ * @udev: udev library context
+ * @subsystem: the subsystem of the device
+ * @sysname: the name of the device
+ *
+ * Create new udev device, and fill in information from the sys device
+ * and the udev database entry. The device is looked up by the subsystem
+ * and name string of the device, like "mem" / "zero", or "block" / "sda".
+ *
+ * The initial refcount is 1, and needs to be decremented to
+ * release the resources of the udev device.
+ *
+ * Returns: a new udev device, or #NULL, if it does not exist
+ **/
struct udev_device *udev_device_new_from_subsystem_sysname(struct udev *udev, const char *subsystem, const char *sysname)
{
char path_full[UTIL_PATH_SIZE];
return udev_device_new_from_syspath(udev, path_full);
}
+/**
+ * udev_device_new_from_environment
+ * @udev: udev library context
+ *
+ * Create new udev device, and fill in information from the
+ * current process environment. This only works reliable if
+ * the process is called from a udev rule. It is usually used
+ * for tools executed from IMPORT= rules.
+ *
+ * The initial refcount is 1, and needs to be decremented to
+ * release the resources of the udev device.
+ *
+ * Returns: a new udev device, or #NULL, if it does not exist
+ **/
+struct udev_device *udev_device_new_from_environment(struct udev *udev)
+{
+ int i;
+ struct udev_device *udev_device;
+
+ udev_device = udev_device_new(udev);
+ if (udev_device == NULL)
+ return NULL;
+ udev_device_set_info_loaded(udev_device);
+
+ for (i = 0; environ[i] != NULL; i++)
+ udev_device_add_property_from_string_parse(udev_device, environ[i]);
+
+ if (udev_device_add_property_from_string_parse_finish(udev_device) < 0) {
+ info(udev, "missing values, invalid device\n");
+ udev_device_unref(udev_device);
+ udev_device = NULL;
+ }
+
+ return udev_device;
+}
+
static struct udev_device *device_new_from_parent(struct udev_device *udev_device)
{
struct udev_device *udev_device_parent = NULL;
char path[UTIL_PATH_SIZE];
const char *subdir;
- /* follow "device" link in deprecated sys layout */
- if (strncmp(udev_device->devpath, "/class/", 7) == 0 ||
- strncmp(udev_device->devpath, "/block/", 7) == 0) {
- util_strscpyl(path, sizeof(path), udev_device->syspath, "/device", NULL);
- if (util_resolve_sys_link(udev_device->udev, path, sizeof(path)) == 0) {
- udev_device_parent = udev_device_new_from_syspath(udev_device->udev, path);
- if (udev_device_parent != NULL)
- return udev_device_parent;
- }
- }
-
util_strscpy(path, sizeof(path), udev_device->syspath);
subdir = &path[strlen(udev_get_sys_path(udev_device->udev))+1];
- while (1) {
+ for (;;) {
char *pos;
pos = strrchr(subdir, '/');
return NULL;
}
+/**
+ * udev_device_get_parent:
+ * @udev_device: the device to start searching from
+ *
+ * Find the next parent device, and fill in information from the sys
+ * device and the udev database entry.
+ *
+ * The returned the device is not referenced. It is attached to the
+ * child device, and will be cleaned up when the child device
+ * is cleaned up.
+ *
+ * It is not necessarily just the upper level directory, empty or not
+ * recognized sys directories are ignored.
+ *
+ * It can be called as many times as needed, without caring about
+ * references.
+ *
+ * Returns: a new udev device, or #NULL, if it no parent exist.
+ **/
struct udev_device *udev_device_get_parent(struct udev_device *udev_device)
{
if (udev_device == NULL)
return NULL;
if (!udev_device->parent_set) {
- udev_device->parent_set = 1;
+ udev_device->parent_set = true;
udev_device->parent_device = device_new_from_parent(udev_device);
}
if (udev_device->parent_device != NULL)
return udev_device->parent_device;
}
+/**
+ * udev_device_get_parent_with_subsystem_devtype:
+ * @udev_device: udev device to start searching from
+ * @subsystem: the subsystem of the device
+ * @devtype: the type (DEVTYPE) of the device
+ *
+ * Find the next parent device, with a matching subsystem and devtype
+ * value, and fill in information from the sys device and the udev
+ * database entry.
+ *
+ * If devtype is #NULL, only subsystem is checked, and any devtype will
+ * match.
+ *
+ * The returned the device is not referenced. It is attached to the
+ * child device, and will be cleaned up when the child device
+ * is cleaned up.
+ *
+ * It can be called as many times as needed, without caring about
+ * references.
+ *
+ * Returns: a new udev device, or #NULL if no matching parent exists.
+ **/
struct udev_device *udev_device_get_parent_with_subsystem_devtype(struct udev_device *udev_device, const char *subsystem, const char *devtype)
{
struct udev_device *parent;
free(udev_device->devtype);
udev_list_cleanup_entries(udev_device->udev, &udev_device->devlinks_list);
udev_list_cleanup_entries(udev_device->udev, &udev_device->properties_list);
+ udev_list_cleanup_entries(udev_device->udev, &udev_device->sysattr_list);
+ udev_list_cleanup_entries(udev_device->udev, &udev_device->tags_list);
free(udev_device->action);
free(udev_device->driver);
free(udev_device->devpath_old);
+ free(udev_device->sysname_old);
free(udev_device->knodename);
- udev_list_cleanup_entries(udev_device->udev, &udev_device->sysattr_list);
+ free(udev_device->id_filename);
free(udev_device->envp);
free(udev_device->monitor_buf);
dbg(udev_device->udev, "udev_device: %p released\n", udev_device);
return udev_device->syspath;
}
+/**
+ * udev_device_get_sysname:
+ * @udev_device: udev device
+ *
+ * Returns: the sys name of the device device
+ **/
const char *udev_device_get_sysname(struct udev_device *udev_device)
{
if (udev_device == NULL)
return udev_device->sysname;
}
+/**
+ * udev_device_get_sysnum:
+ * @udev_device: udev device
+ *
+ * Returns: the trailing number of of the device name
+ **/
const char *udev_device_get_sysnum(struct udev_device *udev_device)
{
if (udev_device == NULL)
{
if (udev_device == NULL)
return NULL;
- if (!udev_device->info_loaded)
- device_load_info(udev_device);
+ if (!udev_device->info_loaded) {
+ udev_device_read_uevent_file(udev_device);
+ udev_device_read_db(udev_device);
+ }
+
+ /* we might get called before we handled an event and have a db, use the kernel-provided name */
+ if (udev_device->devnode == NULL && udev_device_get_knodename(udev_device) != NULL) {
+ char filename[UTIL_NAME_SIZE];
+
+ util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev_device->udev), "/",
+ udev_device_get_knodename(udev_device), NULL);
+ udev_device_set_devnode(udev_device, filename);
+ return udev_device->devnode;
+ }
+
return udev_device->devnode;
}
if (udev_device == NULL)
return NULL;
if (!udev_device->subsystem_set) {
- udev_device->subsystem_set = 1;
- /* read "subsytem" link */
+ udev_device->subsystem_set = true;
+ /* read "subsystem" link */
if (util_get_sys_subsystem(udev_device->udev, udev_device->syspath, subsystem, sizeof(subsystem)) > 0) {
udev_device_set_subsystem(udev_device, subsystem);
return udev_device->subsystem;
if (udev_device == NULL)
return NULL;
if (!udev_device->devtype_set) {
- udev_device->devtype_set = 1;
- if (!udev_device->info_loaded)
- udev_device_read_uevent_file(udev_device);
+ udev_device->devtype_set = true;
+ udev_device_read_uevent_file(udev_device);
}
return udev_device->devtype;
}
if (udev_device == NULL)
return NULL;
if (!udev_device->info_loaded)
- device_load_info(udev_device);
+ udev_device_read_db(udev_device);
return udev_list_get_entry(&udev_device->devlinks_list);
}
void udev_device_cleanup_devlinks_list(struct udev_device *udev_device)
{
- udev_device->devlinks_uptodate = 0;
+ udev_device->devlinks_uptodate = false;
udev_list_cleanup_entries(udev_device->udev, &udev_device->devlinks_list);
}
{
if (udev_device == NULL)
return NULL;
- if (!udev_device->info_loaded)
- device_load_info(udev_device);
+ if (!udev_device->info_loaded) {
+ udev_device_read_uevent_file(udev_device);
+ udev_device_read_db(udev_device);
+ }
if (!udev_device->devlinks_uptodate) {
char symlinks[UTIL_PATH_SIZE];
struct udev_list_entry *list_entry;
- udev_device->devlinks_uptodate = 1;
+ udev_device->devlinks_uptodate = true;
list_entry = udev_device_get_devlinks_list_entry(udev_device);
if (list_entry != NULL) {
char *s;
udev_device_add_property(udev_device, "DEVLINKS", symlinks);
}
}
+ if (!udev_device->tags_uptodate) {
+ udev_device->tags_uptodate = true;
+ if (udev_device_get_tags_list_entry(udev_device) != NULL) {
+ char tags[UTIL_PATH_SIZE];
+ struct udev_list_entry *list_entry;
+ char *s;
+ size_t l;
+
+ s = tags;
+ l = util_strpcpyl(&s, sizeof(tags), ":", NULL);
+ udev_list_entry_foreach(list_entry, udev_device_get_tags_list_entry(udev_device))
+ l = util_strpcpyl(&s, l, udev_list_entry_get_name(list_entry), ":", NULL);
+ udev_device_add_property(udev_device, "TAGS", tags);
+ }
+ }
return udev_list_get_entry(&udev_device->properties_list);
}
+/**
+ * udev_device_get_driver:
+ * @udev_device: udev device
+ *
+ * Returns: the driver string, or #NULL if there is no driver attached.
+ **/
const char *udev_device_get_driver(struct udev_device *udev_device)
{
char driver[UTIL_NAME_SIZE];
if (udev_device == NULL)
return NULL;
if (!udev_device->driver_set) {
- udev_device->driver_set = 1;
+ udev_device->driver_set = true;
if (util_get_sys_driver(udev_device->udev, udev_device->syspath, driver, sizeof(driver)) > 0)
udev_device->driver = strdup(driver);
}
return udev_device->driver;
}
+/**
+ * udev_device_get_devnum:
+ * @udev_device: udev device
+ *
+ * Returns: the device major/minor number.
+ **/
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);
+ udev_device_read_uevent_file(udev_device);
return udev_device->devnum;
}
+/**
+ * udev_device_get_action:
+ * @udev_device: udev device
+ *
+ * This is only valid if the device was received through a monitor. Devices read from
+ * sys do not have an action string. Usual actions are: add, remove, change, online,
+ * offline.
+ *
+ * Returns: the kernel action value, or #NULL if there is no action value available.
+ **/
const char *udev_device_get_action(struct udev_device *udev_device)
{
if (udev_device == NULL)
return udev_device->action;
}
+/**
+ * udev_device_get_devnum:
+ * @udev_device: udev device
+ *
+ * This is only valid if the device was received through a monitor. Devices read from
+ * sys do not have a sequence number.
+ *
+ * Returns: the kernel event sequence number, or 0 if there is no sequence number available.
+ **/
unsigned long long int udev_device_get_seqnum(struct udev_device *udev_device)
{
if (udev_device == NULL)
return udev_device->seqnum;
}
+/**
+ * udev_device_get_sysattr_value:
+ * @udev_device: udev device
+ * @sysattr: attribute name
+ *
+ * The retrieved value is cached in the device. Repeated calls will return the same
+ * value and not open the attribute again.
+ *
+ * Returns: the content of a sys attribute file, or #NULL if there is no sys attribute value.
+ **/
const char *udev_device_get_sysattr_value(struct udev_device *udev_device, const char *sysattr)
{
struct udev_list_entry *list_entry;
goto out;
len = readlink(path, target, sizeof(target));
- if (len > 0) {
- target[len] = '\0';
- pos = strrchr(target, '/');
- if (pos != NULL) {
- pos = &pos[1];
- dbg(udev_device->udev, "cache '%s' with link value '%s'\n", sysattr, pos);
- list_entry = udev_list_entry_add(udev_device->udev, &udev_device->sysattr_list, sysattr, pos, 0, 0);
- val = udev_list_entry_get_value(list_entry);
- }
+ if (len <= 0 || len == sizeof(target))
+ goto out;
+ target[len] = '\0';
+
+ pos = strrchr(target, '/');
+ if (pos != NULL) {
+ pos = &pos[1];
+ dbg(udev_device->udev, "cache '%s' with link value '%s'\n", sysattr, pos);
+ list_entry = udev_list_entry_add(udev_device->udev, &udev_device->sysattr_list, sysattr, pos, 0, 0);
+ val = udev_list_entry_get_value(list_entry);
}
+
goto out;
}
goto out;
/* read attribute value */
- fd = open(path, O_RDONLY);
+ fd = open(path, O_RDONLY|O_CLOEXEC);
if (fd < 0) {
dbg(udev_device->udev, "attribute '%s' can not be opened\n", path);
goto out;
udev_device->subsystem = strdup(subsystem);
if (udev_device->subsystem == NULL)
return -ENOMEM;
- udev_device->subsystem_set = 1;
+ udev_device->subsystem_set = true;
udev_device_add_property(udev_device, "SUBSYSTEM", udev_device->subsystem);
return 0;
}
udev_device->devtype = strdup(devtype);
if (udev_device->devtype == NULL)
return -ENOMEM;
- udev_device->devtype_set = 1;
+ udev_device->devtype_set = true;
udev_device_add_property(udev_device, "DEVTYPE", udev_device->devtype);
return 0;
}
{
free(udev_device->devnode);
udev_device->devnode = strdup(devnode);
- if (devnode == NULL)
- return 0;
if (udev_device->devnode == NULL)
return -ENOMEM;
udev_device_add_property(udev_device, "DEVNAME", udev_device->devnode);
return 0;
}
-int udev_device_add_devlink(struct udev_device *udev_device, const char *devlink)
+int udev_device_add_devlink(struct udev_device *udev_device, const char *devlink, int unique)
{
- udev_device->devlinks_uptodate = 0;
- if (udev_list_entry_add(udev_device->udev, &udev_device->devlinks_list, devlink, NULL, 1, 0) == NULL)
+ struct udev_list_entry *list_entry;
+
+ udev_device->devlinks_uptodate = false;
+ list_entry = udev_list_entry_add(udev_device->udev, &udev_device->devlinks_list, devlink, NULL, 1, 0);
+ if (list_entry == NULL)
return -ENOMEM;
+ if (unique)
+ udev_list_entry_set_flags(list_entry, 1);
return 0;
}
-struct udev_list_entry *udev_device_add_property(struct udev_device *udev_device, const char *key, const char *value)
+const char *udev_device_get_id_filename(struct udev_device *udev_device)
{
- udev_device->envp_uptodate = 0;
- if (value == NULL) {
- struct udev_list_entry *list_entry;
+ if (udev_device->id_filename == NULL) {
+ if (udev_device_get_subsystem(udev_device) == NULL)
+ return NULL;
- list_entry = udev_device_get_properties_list_entry(udev_device);
- list_entry = udev_list_entry_get_by_name(list_entry, key);
- if (list_entry != NULL)
- udev_list_entry_delete(list_entry);
- return NULL;
+ if (major(udev_device_get_devnum(udev_device)) > 0) {
+ /* use dev_t -- b259:131072, c254:0 */
+ if (asprintf(&udev_device->id_filename, "%c%u:%u",
+ strcmp(udev_device_get_subsystem(udev_device), "block") == 0 ? 'b' : 'c',
+ major(udev_device_get_devnum(udev_device)),
+ minor(udev_device_get_devnum(udev_device))) < 0)
+ udev_device->id_filename = NULL;
+ } else if (udev_device_get_ifindex(udev_device) > 0) {
+ /* use netdev ifindex -- n3 */
+ if (asprintf(&udev_device->id_filename, "n%u", udev_device_get_ifindex(udev_device)) < 0)
+ udev_device->id_filename = NULL;
+ } else {
+ /*
+ * use $subsys:$syname -- pci:0000:00:1f.2
+ * sysname() has '!' translated, get it from devpath
+ */
+ const char *sysname;
+ sysname = strrchr(udev_device->devpath, '/');
+ if (sysname == NULL)
+ return NULL;
+ sysname = &sysname[1];
+ if (asprintf(&udev_device->id_filename, "+%s:%s", udev_device_get_subsystem(udev_device), sysname) < 0)
+ udev_device->id_filename = NULL;
+ }
}
- return udev_list_entry_add(udev_device->udev, &udev_device->properties_list, key, value, 1, 0);
+ return udev_device->id_filename;
}
-struct udev_list_entry *udev_device_add_property_from_string(struct udev_device *udev_device, const char *property)
+/**
+ * udev_device_get_is_initialized:
+ * @udev_device: udev device
+ *
+ * Check if udev has already handled the device and has set up
+ * device node permissions and context, or has renamed a network
+ * device.
+ *
+ * For now, this is only implemented for devices with a device node
+ * or network interfaces. All other devices return 1 here.
+ *
+ * Returns: 1 if the device is set up. 0 otherwise.
+ **/
+int udev_device_get_is_initialized(struct udev_device *udev_device)
{
- char name[UTIL_PATH_SIZE];
- char *val;
+ if (!udev_device->info_loaded)
+ udev_device_read_db(udev_device);
+ return udev_device->is_initialized;
+}
- util_strscpy(name, sizeof(name), property);
- 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);
+void udev_device_set_is_initialized(struct udev_device *udev_device)
+{
+ udev_device->is_initialized = true;
}
-const char *udev_device_get_property_value(struct udev_device *udev_device, const char *key)
+int udev_device_add_tag(struct udev_device *udev_device, const char *tag)
{
- struct udev_list_entry *list_entry;
+ if (strchr(tag, ':') != NULL || strchr(tag, ' ') != NULL)
+ return -EINVAL;
+ udev_device->tags_uptodate = false;
+ if (udev_list_entry_add(udev_device->udev, &udev_device->tags_list, tag, NULL, 1, 0) != NULL)
+ return 0;
+ return -ENOMEM;
+}
+
+void udev_device_cleanup_tags_list(struct udev_device *udev_device)
+{
+ udev_device->tags_uptodate = false;
+ udev_list_cleanup_entries(udev_device->udev, &udev_device->tags_list);
+}
+/**
+ * udev_device_get_tags_list_entry:
+ * @udev_device: udev device
+ *
+ * Retrieve the list of tags attached to the udev device. The next
+ * list entry can be retrieved with udev_list_entry_next(),
+ * which returns #NULL if no more entries exist. The tag string
+ * can be retrieved from the list entry by udev_list_get_name().
+ *
+ * Returns: the first entry of the tag list
+ **/
+struct udev_list_entry *udev_device_get_tags_list_entry(struct udev_device *udev_device)
+{
if (udev_device == NULL)
return NULL;
- if (key == NULL)
- return NULL;
+ return udev_list_get_entry(&udev_device->tags_list);
+}
- list_entry = udev_device_get_properties_list_entry(udev_device);
- list_entry = udev_list_entry_get_by_name(list_entry, key);
- return udev_list_entry_get_value(list_entry);
+int udev_device_has_tag(struct udev_device *udev_device, const char *tag)
+{
+ struct udev_list_entry *list_entry;
+
+ if (!udev_device->info_loaded)
+ udev_device_read_db(udev_device);
+ list_entry = udev_device_get_tags_list_entry(udev_device);
+ list_entry = udev_list_entry_get_by_name(list_entry, tag);
+ if (list_entry != NULL)
+ return 1;
+ return 0;
}
#define ENVP_SIZE 128
s = udev_device->monitor_buf;
l = MONITOR_BUF_SIZE;
udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device)) {
+ const char *key;
+
+ key = udev_list_entry_get_name(list_entry);
+ /* skip private variables */
+ if (key[0] == '.')
+ continue;
+
/* add string to envp array */
udev_device->envp[i++] = s;
if (i+1 >= ENVP_SIZE)
return -EINVAL;
/* add property string to monitor buffer */
- l = util_strpcpyl(&s, l, udev_list_entry_get_name(list_entry), "=",
- udev_list_entry_get_value(list_entry), NULL);
+ l = util_strpcpyl(&s, l, key, "=", udev_list_entry_get_value(list_entry), NULL);
if (l == 0)
return -EINVAL;
+ /* advance past the trailing '\0' that util_strpcpyl() guarantees */
s++;
+ l--;
}
udev_device->envp[i] = NULL;
udev_device->monitor_buf_len = s - udev_device->monitor_buf;
- udev_device->envp_uptodate = 1;
+ udev_device->envp_uptodate = true;
dbg(udev_device->udev, "filled envp/monitor buffer, %u properties, %zu bytes\n",
i, udev_device->monitor_buf_len);
return 0;
udev_device->driver = strdup(driver);
if (udev_device->driver == NULL)
return -ENOMEM;
- udev_device->driver_set = 1;
+ udev_device->driver_set = true;
udev_device_add_property(udev_device, "DRIVER", udev_device->driver);
return 0;
}
int udev_device_set_devpath_old(struct udev_device *udev_device, const char *devpath_old)
{
+ const char *pos;
+ size_t len;
+
+ free(udev_device->devpath_old);
udev_device->devpath_old = strdup(devpath_old);
if (udev_device->devpath_old == NULL)
return -ENOMEM;
udev_device_add_property(udev_device, "DEVPATH_OLD", udev_device->devpath_old);
+
+ pos = strrchr(udev_device->devpath_old, '/');
+ if (pos == NULL)
+ return -EINVAL;
+ udev_device->sysname_old = strdup(&pos[1]);
+ if (udev_device->sysname_old == NULL)
+ return -ENOMEM;
+
+ /* some devices have '!' in their name, change that to '/' */
+ len = 0;
+ while (udev_device->sysname_old[len] != '\0') {
+ if (udev_device->sysname_old[len] == '!')
+ udev_device->sysname_old[len] = '/';
+ len++;
+ }
return 0;
}
+const char *udev_device_get_sysname_old(struct udev_device *udev_device)
+{
+ if (udev_device == NULL)
+ return NULL;
+ return udev_device->sysname_old;
+}
+
const char *udev_device_get_knodename(struct udev_device *udev_device)
{
return udev_device->knodename;
int udev_device_set_knodename(struct udev_device *udev_device, const char *knodename)
{
+ free(udev_device->knodename);
udev_device->knodename = strdup(knodename);
if (udev_device->knodename == NULL)
return -ENOMEM;
+ /* do not overwrite the udev property with the kernel property */
+ if (udev_device->devnode == NULL)
+ udev_device_add_property(udev_device, "DEVNAME", udev_device->knodename);
return 0;
}
int udev_device_get_event_timeout(struct udev_device *udev_device)
{
if (!udev_device->info_loaded)
- device_load_info(udev_device);
+ udev_device_read_db(udev_device);
return udev_device->event_timeout;
}
int udev_device_set_event_timeout(struct udev_device *udev_device, int event_timeout)
{
+ char num[32];
+
udev_device->event_timeout = event_timeout;
+ snprintf(num, sizeof(num), "%u", event_timeout);
+ udev_device_add_property(udev_device, "TIMEOUT", num);
return 0;
}
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;
- return 0;
-}
-
int udev_device_get_devlink_priority(struct udev_device *udev_device)
{
if (!udev_device->info_loaded)
- device_load_info(udev_device);
+ udev_device_read_db(udev_device);
return udev_device->devlink_priority;
}
return 0;
}
-int udev_device_get_ignore_remove(struct udev_device *udev_device)
+int udev_device_get_watch_handle(struct udev_device *udev_device)
{
if (!udev_device->info_loaded)
- device_load_info(udev_device);
- return udev_device->ignore_remove;
+ udev_device_read_db(udev_device);
+ return udev_device->watch_handle;
}
-int udev_device_set_ignore_remove(struct udev_device *udev_device, int ignore)
+int udev_device_set_watch_handle(struct udev_device *udev_device, int handle)
{
- udev_device->ignore_remove = ignore;
+ udev_device->watch_handle = handle;
return 0;
}
-int udev_device_get_watch_handle(struct udev_device *udev_device)
+int udev_device_get_ifindex(struct udev_device *udev_device)
{
if (!udev_device->info_loaded)
- device_load_info(udev_device);
- return udev_device->watch_handle;
+ udev_device_read_uevent_file(udev_device);
+ return udev_device->ifindex;
}
-int udev_device_set_watch_handle(struct udev_device *udev_device, int handle)
+int udev_device_set_ifindex(struct udev_device *udev_device, int ifindex)
{
- udev_device->watch_handle = handle;
+ char num[32];
+
+ udev_device->ifindex = ifindex;
+ snprintf(num, sizeof(num), "%u", ifindex);
+ udev_device_add_property(udev_device, "IFINDEX", num);
return 0;
}
~ianmdlvl / elogind.git / blobdiff