/*
* 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>
int refcount;
dev_t devnum;
int watch_handle;
+ int maj, min;
unsigned int parent_set:1;
unsigned int subsystem_set:1;
unsigned int devtype_set:1;
unsigned int ignore_remove:1;
};
+struct udev_list_entry *udev_device_add_property(struct udev_device *udev_device, const char *key, const char *value)
+{
+ udev_device->envp_uptodate = 0;
+ if (value == NULL) {
+ struct udev_list_entry *list_entry;
+
+ 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);
+}
+
+static struct udev_list_entry *udev_device_add_property_from_string(struct udev_device *udev_device, const char *property)
+{
+ char name[UTIL_LINE_SIZE];
+ char *val;
+
+ 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);
+}
+
+/*
+ * 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;
+
+ util_strscpy(devlinks, sizeof(devlinks), &property[9]);
+ slink = devlinks;
+ next = strchr(slink, ' ');
+ while (next != NULL) {
+ next[0] = '\0';
+ udev_device_add_devlink(udev_device, slink, 0);
+ slink = &next[1];
+ next = strchr(slink, ' ');
+ }
+ if (slink[0] != '\0')
+ udev_device_add_devlink(udev_device, slink, 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 {
+ 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)
{
struct stat stats;
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(&syspath[len], "/devices/", 9) == 0) {
char file[UTIL_PATH_SIZE];
/* all "devices" require a "uevent" file */
* @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. Character and block device numbers
- * are not unique across the two types, they do not share the same
- * range of numbers.
+ * 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.
{
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);
-
- 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;
-
- 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;
+ /* 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);
}
/**
* @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".
+ * 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.
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, '/');
* 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
+ * 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
if (list_entry == NULL)
return -ENOMEM;
if (unique)
- udev_list_entry_set_flag(list_entry, 1);
+ 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)
-{
- udev_device->envp_uptodate = 0;
- if (value == NULL) {
- struct udev_list_entry *list_entry;
-
- 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);
-}
-
-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;
-
- 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);
-}
-
-/**
- * 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);
-}
-
#define ENVP_SIZE 128
#define MONITOR_BUF_SIZE 4096
static int update_envp_monitor_buf(struct udev_device *udev_device)
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;