[linux.git] / lib / kobject_uevent.c

/*
 * kernel userspace event delivery
 *
 * Copyright (C) 2004 Red Hat, Inc.  All rights reserved.
 * Copyright (C) 2004 Novell, Inc.  All rights reserved.
 * Copyright (C) 2004 IBM, Inc. All rights reserved.
 *
 * Licensed under the GNU GPL v2.
 *
 * Authors:
 *	Robert Love		<[email protected]>
 *	Kay Sievers		<[email protected]>
 *	Arjan van de Ven	<[email protected]>
 *	Greg Kroah-Hartman	<[email protected]>
 */

#include <linux/spinlock.h>
#include <linux/string.h>
#include <linux/kobject.h>
#include <linux/module.h>

#include <linux/socket.h>
#include <linux/skbuff.h>
#include <linux/netlink.h>
#include <net/sock.h>


u64 uevent_seqnum;
char uevent_helper[UEVENT_HELPER_PATH_LEN] = CONFIG_UEVENT_HELPER_PATH;
static DEFINE_SPINLOCK(sequence_lock);
#if defined(CONFIG_NET)
static struct sock *uevent_sock;
#endif

/* the strings here must match the enum in include/linux/kobject.h */
static const char *kobject_actions[] = {
	[KOBJ_ADD] =		"add",
	[KOBJ_REMOVE] =		"remove",
	[KOBJ_CHANGE] =		"change",
	[KOBJ_MOVE] =		"move",
	[KOBJ_ONLINE] =		"online",
	[KOBJ_OFFLINE] =	"offline",
};

/**
 * kobject_action_type - translate action string to numeric type
 *
 * @buf: buffer containing the action string, newline is ignored
 * @len: length of buffer
 * @type: pointer to the location to store the action type
 *
 * Returns 0 if the action string was recognized.
 */
int kobject_action_type(const char *buf, size_t count,
			enum kobject_action *type)
{
	enum kobject_action action;
	int ret = -EINVAL;

	if (count && (buf[count-1] == '\n' || buf[count-1] == '\0'))
		count--;

	if (!count)
		goto out;

	for (action = 0; action < ARRAY_SIZE(kobject_actions); action++) {
		if (strncmp(kobject_actions[action], buf, count) != 0)
			continue;
		if (kobject_actions[action][count] != '\0')
			continue;
		*type = action;
		ret = 0;
		break;
	}
out:
	return ret;
}

/**
 * kobject_uevent_env - send an uevent with environmental data
 *
 * @action: action that is happening
 * @kobj: struct kobject that the action is happening to
 * @envp_ext: pointer to environmental data
 *
 * Returns 0 if kobject_uevent() is completed with success or the
 * corresponding error when it fails.
 */
int kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
		       char *envp_ext[])
{
	struct kobj_uevent_env *env;
	const char *action_string = kobject_actions[action];
	const char *devpath = NULL;
	const char *subsystem;
	struct kobject *top_kobj;
	struct kset *kset;
	struct kset_uevent_ops *uevent_ops;
	u64 seq;
	int i = 0;
	int retval = 0;

	pr_debug("kobject: '%s' (%p): %s\n",
		 kobject_name(kobj), kobj, __func__);

	/* search the kset we belong to */
	top_kobj = kobj;
	while (!top_kobj->kset && top_kobj->parent)
		top_kobj = top_kobj->parent;

	if (!top_kobj->kset) {
		pr_debug("kobject: '%s' (%p): %s: attempted to send uevent "
			 "without kset!\n", kobject_name(kobj), kobj,
			 __func__);
		return -EINVAL;
	}

	kset = top_kobj->kset;
	uevent_ops = kset->uevent_ops;

	/* skip the event, if uevent_suppress is set*/
	if (kobj->uevent_suppress) {
		pr_debug("kobject: '%s' (%p): %s: uevent_suppress "
				 "caused the event to drop!\n",
				 kobject_name(kobj), kobj, __func__);
		return 0;
	}
	/* skip the event, if the filter returns zero. */
	if (uevent_ops && uevent_ops->filter)
		if (!uevent_ops->filter(kset, kobj)) {
			pr_debug("kobject: '%s' (%p): %s: filter function "
				 "caused the event to drop!\n",
				 kobject_name(kobj), kobj, __func__);
			return 0;
		}

	/* originating subsystem */
	if (uevent_ops && uevent_ops->name)
		subsystem = uevent_ops->name(kset, kobj);
	else
		subsystem = kobject_name(&kset->kobj);
	if (!subsystem) {
		pr_debug("kobject: '%s' (%p): %s: unset subsystem caused the "
			 "event to drop!\n", kobject_name(kobj), kobj,
			 __func__);
		return 0;
	}

	/* environment buffer */
	env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL);
	if (!env)
		return -ENOMEM;

	/* complete object path */
	devpath = kobject_get_path(kobj, GFP_KERNEL);
	if (!devpath) {
		retval = -ENOENT;
		goto exit;
	}

	/* default keys */
	retval = add_uevent_var(env, "ACTION=%s", action_string);
	if (retval)
		goto exit;
	retval = add_uevent_var(env, "DEVPATH=%s", devpath);
	if (retval)
		goto exit;
	retval = add_uevent_var(env, "SUBSYSTEM=%s", subsystem);
	if (retval)
		goto exit;

	/* keys passed in from the caller */
	if (envp_ext) {
		for (i = 0; envp_ext[i]; i++) {
			retval = add_uevent_var(env, "%s", envp_ext[i]);
			if (retval)
				goto exit;
		}
	}

	/* let the kset specific function add its stuff */
	if (uevent_ops && uevent_ops->uevent) {
		retval = uevent_ops->uevent(kset, kobj, env);
		if (retval) {
			pr_debug("kobject: '%s' (%p): %s: uevent() returned "
				 "%d\n", kobject_name(kobj), kobj,
				 __func__, retval);
			goto exit;
		}
	}

	/*
	 * Mark "add" and "remove" events in the object to ensure proper
	 * events to userspace during automatic cleanup. If the object did
	 * send an "add" event, "remove" will automatically generated by
	 * the core, if not already done by the caller.
	 */
	if (action == KOBJ_ADD)
		kobj->state_add_uevent_sent = 1;
	else if (action == KOBJ_REMOVE)
		kobj->state_remove_uevent_sent = 1;

	/* we will send an event, so request a new sequence number */
	spin_lock(&sequence_lock);
	seq = ++uevent_seqnum;
	spin_unlock(&sequence_lock);
	retval = add_uevent_var(env, "SEQNUM=%llu", (unsigned long long)seq);
	if (retval)
		goto exit;

#if defined(CONFIG_NET)
	/* send netlink message */
	if (uevent_sock) {
		struct sk_buff *skb;
		size_t len;

		/* allocate message with the maximum possible size */
		len = strlen(action_string) + strlen(devpath) + 2;
		skb = alloc_skb(len + env->buflen, GFP_KERNEL);
		if (skb) {
			char *scratch;

			/* add header */
			scratch = skb_put(skb, len);
			sprintf(scratch, "%s@%s", action_string, devpath);

			/* copy keys to our continuous event payload buffer */
			for (i = 0; i < env->envp_idx; i++) {
				len = strlen(env->envp[i]) + 1;
				scratch = skb_put(skb, len);
				strcpy(scratch, env->envp[i]);
			}

			NETLINK_CB(skb).dst_group = 1;
			retval = netlink_broadcast(uevent_sock, skb, 0, 1,
						   GFP_KERNEL);
			/* ENOBUFS should be handled in userspace */
			if (retval == -ENOBUFS)
				retval = 0;
		} else
			retval = -ENOMEM;
	}
#endif

	/* call uevent_helper, usually only enabled during early boot */
	if (uevent_helper[0]) {
		char *argv [3];

		argv [0] = uevent_helper;
		argv [1] = (char *)subsystem;
		argv [2] = NULL;
		retval = add_uevent_var(env, "HOME=/");
		if (retval)
			goto exit;
		retval = add_uevent_var(env,
					"PATH=/sbin:/bin:/usr/sbin:/usr/bin");
		if (retval)
			goto exit;

		retval = call_usermodehelper(argv[0], argv,
					     env->envp, UMH_WAIT_EXEC);
	}

exit:
	kfree(devpath);
	kfree(env);
	return retval;
}
EXPORT_SYMBOL_GPL(kobject_uevent_env);

/**
 * kobject_uevent - notify userspace by ending an uevent
 *
 * @action: action that is happening
 * @kobj: struct kobject that the action is happening to
 *
 * Returns 0 if kobject_uevent() is completed with success or the
 * corresponding error when it fails.
 */
int kobject_uevent(struct kobject *kobj, enum kobject_action action)
{
	return kobject_uevent_env(kobj, action, NULL);
}
EXPORT_SYMBOL_GPL(kobject_uevent);

/**
 * add_uevent_var - add key value string to the environment buffer
 * @env: environment buffer structure
 * @format: printf format for the key=value pair
 *
 * Returns 0 if environment variable was added successfully or -ENOMEM
 * if no space was available.
 */
int add_uevent_var(struct kobj_uevent_env *env, const char *format, ...)
{
	va_list args;
	int len;

	if (env->envp_idx >= ARRAY_SIZE(env->envp)) {
		WARN(1, KERN_ERR "add_uevent_var: too many keys\n");
		return -ENOMEM;
	}

	va_start(args, format);
	len = vsnprintf(&env->buf[env->buflen],
			sizeof(env->buf) - env->buflen,
			format, args);
	va_end(args);

	if (len >= (sizeof(env->buf) - env->buflen)) {
		WARN(1, KERN_ERR "add_uevent_var: buffer size too small\n");
		return -ENOMEM;
	}

	env->envp[env->envp_idx++] = &env->buf[env->buflen];
	env->buflen += len + 1;
	return 0;
}
EXPORT_SYMBOL_GPL(add_uevent_var);

#if defined(CONFIG_NET)
static int __init kobject_uevent_init(void)
{
	uevent_sock = netlink_kernel_create(&init_net, NETLINK_KOBJECT_UEVENT,
					    1, NULL, NULL, THIS_MODULE);
	if (!uevent_sock) {
		printk(KERN_ERR
		       "kobject_uevent: unable to create netlink socket!\n");
		return -ENODEV;
	}
	netlink_set_nonroot(NETLINK_KOBJECT_UEVENT, NL_NONROOT_RECV);
	return 0;
}

postcore_initcall(kobject_uevent_init);
#endif
Commit	Line	Data
1da177e4 LT	1	/*
	2	* kernel userspace event delivery
	3	*
	4	* Copyright (C) 2004 Red Hat, Inc. All rights reserved.
	5	* Copyright (C) 2004 Novell, Inc. All rights reserved.
	6	* Copyright (C) 2004 IBM, Inc. All rights reserved.
	7	*
	8	* Licensed under the GNU GPL v2.
	9	*
	10	* Authors:
	11	* Robert Love <[email protected]>
	12	* Kay Sievers <[email protected]>
	13	* Arjan van de Ven <[email protected]>
	14	* Greg Kroah-Hartman <[email protected]>
	15	*/
	16
	17	#include <linux/spinlock.h>
2d38f9a4 DL	18	#include <linux/string.h>
	19	#include <linux/kobject.h>
	20	#include <linux/module.h>
	21
1da177e4 LT	22	#include <linux/socket.h>
	23	#include <linux/skbuff.h>
	24	#include <linux/netlink.h>
1da177e4 LT	25	#include <net/sock.h>
1da177e4 LT	26
1da177e4	27
cd030c4c	28	u64 uevent_seqnum;
6a8d8abb	29	char uevent_helper[UEVENT_HELPER_PATH_LEN] = CONFIG_UEVENT_HELPER_PATH;
cd030c4c CH	30	static DEFINE_SPINLOCK(sequence_lock);
	31	#if defined(CONFIG_NET)
	32	static struct sock *uevent_sock;
	33	#endif
	34
5c5daf65 KS	35	/* the strings here must match the enum in include/linux/kobject.h */
	36	static const char *kobject_actions[] = {
	37	[KOBJ_ADD] = "add",
	38	[KOBJ_REMOVE] = "remove",
	39	[KOBJ_CHANGE] = "change",
	40	[KOBJ_MOVE] = "move",
	41	[KOBJ_ONLINE] = "online",
	42	[KOBJ_OFFLINE] = "offline",
	43	};
	44
	45	/**
	46	* kobject_action_type - translate action string to numeric type
	47	*
	48	* @buf: buffer containing the action string, newline is ignored
	49	* @len: length of buffer
	50	* @type: pointer to the location to store the action type
	51	*
	52	* Returns 0 if the action string was recognized.
	53	*/
	54	int kobject_action_type(const char *buf, size_t count,
	55	enum kobject_action *type)
	56	{
	57	enum kobject_action action;
	58	int ret = -EINVAL;
	59
a9edadbf	60	if (count && (buf[count-1] == '\n' \|\| buf[count-1] == '\0'))
5c5daf65 KS	61	count--;
	62
	63	if (!count)
	64	goto out;
	65
	66	for (action = 0; action < ARRAY_SIZE(kobject_actions); action++) {
	67	if (strncmp(kobject_actions[action], buf, count) != 0)
	68	continue;
	69	if (kobject_actions[action][count] != '\0')
	70	continue;
	71	*type = action;
	72	ret = 0;
	73	break;
	74	}
	75	out:
	76	return ret;
	77	}
	78
1da177e4	79	/**
8a82472f	80	* kobject_uevent_env - send an uevent with environmental data
1da177e4	81	*
ccd490a3	82	* @action: action that is happening
1da177e4	83	* @kobj: struct kobject that the action is happening to
8a82472f	84	* @envp_ext: pointer to environmental data
542cfce6 AK	85	*
	86	* Returns 0 if kobject_uevent() is completed with success or the
	87	* corresponding error when it fails.
1da177e4	88	*/
542cfce6	89	int kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
7eff2e7a	90	char *envp_ext[])
1da177e4	91	{
7eff2e7a KS	92	struct kobj_uevent_env *env;
7eff2e7a KS	93	const char *action_string = kobject_actions[action];
5f123fbd KS	94	const char *devpath = NULL;
	95	const char *subsystem;
	96	struct kobject *top_kobj;
	97	struct kset *kset;
312c004d	98	struct kset_uevent_ops *uevent_ops;
5f123fbd	99	u64 seq;
1da177e4	100	int i = 0;
542cfce6	101	int retval = 0;
1da177e4	102
9f66fa2a	103	pr_debug("kobject: '%s' (%p): %s\n",
810304db	104	kobject_name(kobj), kobj, __func__);
5f123fbd	105
5f123fbd KS	106	/* search the kset we belong to */
5f123fbd KS	107	top_kobj = kobj;
ccd490a3	108	while (!top_kobj->kset && top_kobj->parent)
14193fb9	109	top_kobj = top_kobj->parent;
ccd490a3	110
542cfce6	111	if (!top_kobj->kset) {
9f66fa2a GKH	112	pr_debug("kobject: '%s' (%p): %s: attempted to send uevent "
9f66fa2a GKH	113	"without kset!\n", kobject_name(kobj), kobj,
810304db	114	__func__);
542cfce6 AK	115	return -EINVAL;
542cfce6 AK	116	}
1da177e4	117
5f123fbd	118	kset = top_kobj->kset;
312c004d	119	uevent_ops = kset->uevent_ops;
1da177e4	120
f67f129e ML	121	/* skip the event, if uevent_suppress is set*/
	122	if (kobj->uevent_suppress) {
	123	pr_debug("kobject: '%s' (%p): %s: uevent_suppress "
	124	"caused the event to drop!\n",
	125	kobject_name(kobj), kobj, __func__);
	126	return 0;
	127	}
7eff2e7a	128	/* skip the event, if the filter returns zero. */
312c004d	129	if (uevent_ops && uevent_ops->filter)
542cfce6	130	if (!uevent_ops->filter(kset, kobj)) {
9f66fa2a GKH	131	pr_debug("kobject: '%s' (%p): %s: filter function "
9f66fa2a GKH	132	"caused the event to drop!\n",
810304db	133	kobject_name(kobj), kobj, __func__);
542cfce6 AK	134	return 0;
542cfce6 AK	135	}
1da177e4	136
86406245 KS	137	/* originating subsystem */
	138	if (uevent_ops && uevent_ops->name)
	139	subsystem = uevent_ops->name(kset, kobj);
	140	else
	141	subsystem = kobject_name(&kset->kobj);
	142	if (!subsystem) {
9f66fa2a GKH	143	pr_debug("kobject: '%s' (%p): %s: unset subsystem caused the "
9f66fa2a GKH	144	"event to drop!\n", kobject_name(kobj), kobj,
810304db	145	__func__);
86406245 KS	146	return 0;
	147	}
	148
7eff2e7a KS	149	/* environment buffer */
	150	env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL);
	151	if (!env)
542cfce6	152	return -ENOMEM;
1da177e4	153
5f123fbd KS	154	/* complete object path */
5f123fbd KS	155	devpath = kobject_get_path(kobj, GFP_KERNEL);
542cfce6 AK	156	if (!devpath) {
542cfce6 AK	157	retval = -ENOENT;
5f123fbd	158	goto exit;
542cfce6	159	}
1da177e4	160
5f123fbd	161	/* default keys */
7eff2e7a KS	162	retval = add_uevent_var(env, "ACTION=%s", action_string);
	163	if (retval)
	164	goto exit;
	165	retval = add_uevent_var(env, "DEVPATH=%s", devpath);
	166	if (retval)
	167	goto exit;
	168	retval = add_uevent_var(env, "SUBSYSTEM=%s", subsystem);
	169	if (retval)
	170	goto exit;
	171
	172	/* keys passed in from the caller */
	173	if (envp_ext) {
	174	for (i = 0; envp_ext[i]; i++) {
c65b9145	175	retval = add_uevent_var(env, "%s", envp_ext[i]);
7eff2e7a KS	176	if (retval)
	177	goto exit;
	178	}
	179	}
1da177e4	180
5f123fbd	181	/* let the kset specific function add its stuff */
312c004d	182	if (uevent_ops && uevent_ops->uevent) {
7eff2e7a	183	retval = uevent_ops->uevent(kset, kobj, env);
1da177e4	184	if (retval) {
9f66fa2a GKH	185	pr_debug("kobject: '%s' (%p): %s: uevent() returned "
9f66fa2a GKH	186	"%d\n", kobject_name(kobj), kobj,
810304db	187	__func__, retval);
1da177e4 LT	188	goto exit;
	189	}
	190	}
	191
0f4dafc0 KS	192	/*
	193	* Mark "add" and "remove" events in the object to ensure proper
	194	* events to userspace during automatic cleanup. If the object did
	195	* send an "add" event, "remove" will automatically generated by
	196	* the core, if not already done by the caller.
	197	*/
	198	if (action == KOBJ_ADD)
	199	kobj->state_add_uevent_sent = 1;
	200	else if (action == KOBJ_REMOVE)
	201	kobj->state_remove_uevent_sent = 1;
	202
7eff2e7a	203	/* we will send an event, so request a new sequence number */
1da177e4	204	spin_lock(&sequence_lock);
312c004d	205	seq = ++uevent_seqnum;
1da177e4	206	spin_unlock(&sequence_lock);
7eff2e7a KS	207	retval = add_uevent_var(env, "SEQNUM=%llu", (unsigned long long)seq);
	208	if (retval)
	209	goto exit;
1da177e4	210
4d17ffda	211	#if defined(CONFIG_NET)
5f123fbd KS	212	/* send netlink message */
	213	if (uevent_sock) {
	214	struct sk_buff *skb;
	215	size_t len;
	216
	217	/* allocate message with the maximum possible size */
	218	len = strlen(action_string) + strlen(devpath) + 2;
7eff2e7a	219	skb = alloc_skb(len + env->buflen, GFP_KERNEL);
5f123fbd	220	if (skb) {
7eff2e7a KS	221	char *scratch;
7eff2e7a KS	222
5f123fbd KS	223	/* add header */
	224	scratch = skb_put(skb, len);
	225	sprintf(scratch, "%s@%s", action_string, devpath);
	226
	227	/* copy keys to our continuous event payload buffer */
7eff2e7a KS	228	for (i = 0; i < env->envp_idx; i++) {
7eff2e7a KS	229	len = strlen(env->envp[i]) + 1;
5f123fbd	230	scratch = skb_put(skb, len);
7eff2e7a	231	strcpy(scratch, env->envp[i]);
5f123fbd KS	232	}
	233
	234	NETLINK_CB(skb).dst_group = 1;
e0d7bf5d ML	235	retval = netlink_broadcast(uevent_sock, skb, 0, 1,
e0d7bf5d ML	236	GFP_KERNEL);
ff491a73 PNA	237	/* ENOBUFS should be handled in userspace */
	238	if (retval == -ENOBUFS)
	239	retval = 0;
e0d7bf5d ML	240	} else
e0d7bf5d ML	241	retval = -ENOMEM;
5f123fbd	242	}
4d17ffda	243	#endif
1da177e4	244
5f123fbd	245	/* call uevent_helper, usually only enabled during early boot */
312c004d	246	if (uevent_helper[0]) {
5f123fbd	247	char *argv [3];
1da177e4	248
312c004d	249	argv [0] = uevent_helper;
5f123fbd KS	250	argv [1] = (char *)subsystem;
5f123fbd KS	251	argv [2] = NULL;
7eff2e7a KS	252	retval = add_uevent_var(env, "HOME=/");
	253	if (retval)
	254	goto exit;
e374a2bf GKH	255	retval = add_uevent_var(env,
e374a2bf GKH	256	"PATH=/sbin:/bin:/usr/sbin:/usr/bin");
7eff2e7a KS	257	if (retval)
	258	goto exit;
	259
0ad1d6f3	260	retval = call_usermodehelper(argv[0], argv,
05f54c13	261	env->envp, UMH_WAIT_EXEC);
5f123fbd	262	}
1da177e4 LT	263
1da177e4 LT	264	exit:
5f123fbd	265	kfree(devpath);
7eff2e7a	266	kfree(env);
542cfce6	267	return retval;
1da177e4	268	}
8a82472f CH	269	EXPORT_SYMBOL_GPL(kobject_uevent_env);
	270
	271	/**
	272	* kobject_uevent - notify userspace by ending an uevent
	273	*
ccd490a3	274	* @action: action that is happening
8a82472f	275	* @kobj: struct kobject that the action is happening to
542cfce6 AK	276	*
	277	* Returns 0 if kobject_uevent() is completed with success or the
	278	* corresponding error when it fails.
8a82472f	279	*/
542cfce6	280	int kobject_uevent(struct kobject *kobj, enum kobject_action action)
8a82472f	281	{
542cfce6	282	return kobject_uevent_env(kobj, action, NULL);
8a82472f	283	}
312c004d	284	EXPORT_SYMBOL_GPL(kobject_uevent);
1da177e4 LT	285
1da177e4 LT	286	/**
7eff2e7a KS	287	* add_uevent_var - add key value string to the environment buffer
	288	* @env: environment buffer structure
	289	* @format: printf format for the key=value pair
1da177e4 LT	290	*
	291	* Returns 0 if environment variable was added successfully or -ENOMEM
	292	* if no space was available.
	293	*/
7eff2e7a	294	int add_uevent_var(struct kobj_uevent_env env, const char format, ...)
1da177e4 LT	295	{
1da177e4 LT	296	va_list args;
7eff2e7a	297	int len;
1da177e4	298
7eff2e7a	299	if (env->envp_idx >= ARRAY_SIZE(env->envp)) {
5cd2b459	300	WARN(1, KERN_ERR "add_uevent_var: too many keys\n");
1da177e4	301	return -ENOMEM;
7eff2e7a	302	}
1da177e4 LT	303
1da177e4 LT	304	va_start(args, format);
7eff2e7a KS	305	len = vsnprintf(&env->buf[env->buflen],
	306	sizeof(env->buf) - env->buflen,
	307	format, args);
1da177e4 LT	308	va_end(args);
1da177e4 LT	309
7eff2e7a	310	if (len >= (sizeof(env->buf) - env->buflen)) {
5cd2b459	311	WARN(1, KERN_ERR "add_uevent_var: buffer size too small\n");
1da177e4	312	return -ENOMEM;
7eff2e7a	313	}
1da177e4	314
7eff2e7a KS	315	env->envp[env->envp_idx++] = &env->buf[env->buflen];
7eff2e7a KS	316	env->buflen += len + 1;
1da177e4 LT	317	return 0;
1da177e4 LT	318	}
312c004d	319	EXPORT_SYMBOL_GPL(add_uevent_var);
1da177e4	320
4d17ffda	321	#if defined(CONFIG_NET)
5f123fbd KS	322	static int __init kobject_uevent_init(void)
5f123fbd KS	323	{
b4b51029 EB	324	uevent_sock = netlink_kernel_create(&init_net, NETLINK_KOBJECT_UEVENT,
b4b51029 EB	325	1, NULL, NULL, THIS_MODULE);
5f123fbd KS	326	if (!uevent_sock) {
	327	printk(KERN_ERR
	328	"kobject_uevent: unable to create netlink socket!\n");
	329	return -ENODEV;
	330	}
d094cbe9	331	netlink_set_nonroot(NETLINK_KOBJECT_UEVENT, NL_NONROOT_RECV);
5f123fbd KS	332	return 0;
	333	}
	334
	335	postcore_initcall(kobject_uevent_init);
4d17ffda	336	#endif