Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 <rml@novell.com> |
| 12 | * Kay Sievers <kay.sievers@vrfy.org> |
| 13 | * Arjan van de Ven <arjanv@redhat.com> |
| 14 | * Greg Kroah-Hartman <greg@kroah.com> |
| 15 | */ |
| 16 | |
| 17 | #include <linux/spinlock.h> |
| 18 | #include <linux/socket.h> |
| 19 | #include <linux/skbuff.h> |
| 20 | #include <linux/netlink.h> |
| 21 | #include <linux/string.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <linux/kobject.h> |
| 23 | #include <net/sock.h> |
| 24 | |
Benjamin Herrenschmidt | d87499e | 2006-01-25 10:21:32 +1100 | [diff] [blame] | 25 | #define BUFFER_SIZE 2048 /* buffer for the variables */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #define NUM_ENVP 32 /* number of env pointers */ |
| 27 | |
Kay Sievers | 4d17ffd | 2006-04-25 15:37:26 +0200 | [diff] [blame] | 28 | #if defined(CONFIG_HOTPLUG) |
Jun'ichi Nomura | 5110730 | 2006-03-15 08:28:55 -0500 | [diff] [blame] | 29 | u64 uevent_seqnum; |
| 30 | char uevent_helper[UEVENT_HELPER_PATH_LEN] = "/sbin/hotplug"; |
Kay Sievers | 0296b22 | 2005-11-11 05:33:52 +0100 | [diff] [blame] | 31 | static DEFINE_SPINLOCK(sequence_lock); |
Kay Sievers | 4d17ffd | 2006-04-25 15:37:26 +0200 | [diff] [blame] | 32 | #if defined(CONFIG_NET) |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 33 | static struct sock *uevent_sock; |
Kay Sievers | 4d17ffd | 2006-04-25 15:37:26 +0200 | [diff] [blame] | 34 | #endif |
Kay Sievers | 0296b22 | 2005-11-11 05:33:52 +0100 | [diff] [blame] | 35 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | static char *action_to_string(enum kobject_action action) |
| 37 | { |
| 38 | switch (action) { |
| 39 | case KOBJ_ADD: |
| 40 | return "add"; |
| 41 | case KOBJ_REMOVE: |
| 42 | return "remove"; |
| 43 | case KOBJ_CHANGE: |
| 44 | return "change"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | case KOBJ_OFFLINE: |
| 46 | return "offline"; |
| 47 | case KOBJ_ONLINE: |
| 48 | return "online"; |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 49 | case KOBJ_MOVE: |
| 50 | return "move"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | default: |
| 52 | return NULL; |
| 53 | } |
| 54 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | /** |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 57 | * kobject_uevent_env - send an uevent with environmental data |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | * |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 59 | * @action: action that is happening (usually KOBJ_MOVE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | * @kobj: struct kobject that the action is happening to |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 61 | * @envp_ext: pointer to environmental data |
Aneesh Kumar K.V | 542cfce | 2006-12-19 13:01:27 -0800 | [diff] [blame] | 62 | * |
| 63 | * Returns 0 if kobject_uevent() is completed with success or the |
| 64 | * corresponding error when it fails. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | */ |
Aneesh Kumar K.V | 542cfce | 2006-12-19 13:01:27 -0800 | [diff] [blame] | 66 | int kobject_uevent_env(struct kobject *kobj, enum kobject_action action, |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 67 | char *envp_ext[]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | { |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 69 | char **envp; |
| 70 | char *buffer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | char *scratch; |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 72 | const char *action_string; |
| 73 | const char *devpath = NULL; |
| 74 | const char *subsystem; |
| 75 | struct kobject *top_kobj; |
| 76 | struct kset *kset; |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 77 | struct kset_uevent_ops *uevent_ops; |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 78 | u64 seq; |
| 79 | char *seq_buff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | int i = 0; |
Aneesh Kumar K.V | 542cfce | 2006-12-19 13:01:27 -0800 | [diff] [blame] | 81 | int retval = 0; |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 82 | int j; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 84 | pr_debug("%s\n", __FUNCTION__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | |
| 86 | action_string = action_to_string(action); |
Aneesh Kumar K.V | 542cfce | 2006-12-19 13:01:27 -0800 | [diff] [blame] | 87 | if (!action_string) { |
| 88 | pr_debug("kobject attempted to send uevent without action_string!\n"); |
| 89 | return -EINVAL; |
| 90 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 92 | /* search the kset we belong to */ |
| 93 | top_kobj = kobj; |
John Anthony Kazos Jr | 14193fb | 2007-04-04 07:39:17 -0400 | [diff] [blame] | 94 | while (!top_kobj->kset && top_kobj->parent) { |
| 95 | top_kobj = top_kobj->parent; |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 96 | } |
Aneesh Kumar K.V | 542cfce | 2006-12-19 13:01:27 -0800 | [diff] [blame] | 97 | if (!top_kobj->kset) { |
| 98 | pr_debug("kobject attempted to send uevent without kset!\n"); |
| 99 | return -EINVAL; |
| 100 | } |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 101 | |
| 102 | kset = top_kobj->kset; |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 103 | uevent_ops = kset->uevent_ops; |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 104 | |
| 105 | /* skip the event, if the filter returns zero. */ |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 106 | if (uevent_ops && uevent_ops->filter) |
Aneesh Kumar K.V | 542cfce | 2006-12-19 13:01:27 -0800 | [diff] [blame] | 107 | if (!uevent_ops->filter(kset, kobj)) { |
| 108 | pr_debug("kobject filter function caused the event to drop!\n"); |
| 109 | return 0; |
| 110 | } |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 111 | |
Kay Sievers | 8640624 | 2007-03-14 03:25:56 +0100 | [diff] [blame] | 112 | /* originating subsystem */ |
| 113 | if (uevent_ops && uevent_ops->name) |
| 114 | subsystem = uevent_ops->name(kset, kobj); |
| 115 | else |
| 116 | subsystem = kobject_name(&kset->kobj); |
| 117 | if (!subsystem) { |
| 118 | pr_debug("unset subsytem caused the event to drop!\n"); |
| 119 | return 0; |
| 120 | } |
| 121 | |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 122 | /* environment index */ |
| 123 | envp = kzalloc(NUM_ENVP * sizeof (char *), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | if (!envp) |
Aneesh Kumar K.V | 542cfce | 2006-12-19 13:01:27 -0800 | [diff] [blame] | 125 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 127 | /* environment values */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | buffer = kmalloc(BUFFER_SIZE, GFP_KERNEL); |
Aneesh Kumar K.V | 542cfce | 2006-12-19 13:01:27 -0800 | [diff] [blame] | 129 | if (!buffer) { |
| 130 | retval = -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | goto exit; |
Aneesh Kumar K.V | 542cfce | 2006-12-19 13:01:27 -0800 | [diff] [blame] | 132 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 134 | /* complete object path */ |
| 135 | devpath = kobject_get_path(kobj, GFP_KERNEL); |
Aneesh Kumar K.V | 542cfce | 2006-12-19 13:01:27 -0800 | [diff] [blame] | 136 | if (!devpath) { |
| 137 | retval = -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | goto exit; |
Aneesh Kumar K.V | 542cfce | 2006-12-19 13:01:27 -0800 | [diff] [blame] | 139 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 141 | /* event environemnt for helper process only */ |
| 142 | envp[i++] = "HOME=/"; |
| 143 | envp[i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 145 | /* default keys */ |
| 146 | scratch = buffer; |
| 147 | envp [i++] = scratch; |
| 148 | scratch += sprintf(scratch, "ACTION=%s", action_string) + 1; |
| 149 | envp [i++] = scratch; |
| 150 | scratch += sprintf (scratch, "DEVPATH=%s", devpath) + 1; |
| 151 | envp [i++] = scratch; |
| 152 | scratch += sprintf(scratch, "SUBSYSTEM=%s", subsystem) + 1; |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 153 | for (j = 0; envp_ext && envp_ext[j]; j++) |
| 154 | envp[i++] = envp_ext[j]; |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 155 | /* just reserve the space, overwrite it after kset call has returned */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | envp[i++] = seq_buff = scratch; |
| 157 | scratch += strlen("SEQNUM=18446744073709551616") + 1; |
| 158 | |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 159 | /* let the kset specific function add its stuff */ |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 160 | if (uevent_ops && uevent_ops->uevent) { |
| 161 | retval = uevent_ops->uevent(kset, kobj, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | &envp[i], NUM_ENVP - i, scratch, |
| 163 | BUFFER_SIZE - (scratch - buffer)); |
| 164 | if (retval) { |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 165 | pr_debug ("%s - uevent() returned %d\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | __FUNCTION__, retval); |
| 167 | goto exit; |
| 168 | } |
| 169 | } |
| 170 | |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 171 | /* we will send an event, request a new sequence number */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | spin_lock(&sequence_lock); |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 173 | seq = ++uevent_seqnum; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | spin_unlock(&sequence_lock); |
| 175 | sprintf(seq_buff, "SEQNUM=%llu", (unsigned long long)seq); |
| 176 | |
Kay Sievers | 4d17ffd | 2006-04-25 15:37:26 +0200 | [diff] [blame] | 177 | #if defined(CONFIG_NET) |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 178 | /* send netlink message */ |
| 179 | if (uevent_sock) { |
| 180 | struct sk_buff *skb; |
| 181 | size_t len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 183 | /* allocate message with the maximum possible size */ |
| 184 | len = strlen(action_string) + strlen(devpath) + 2; |
| 185 | skb = alloc_skb(len + BUFFER_SIZE, GFP_KERNEL); |
| 186 | if (skb) { |
| 187 | /* add header */ |
| 188 | scratch = skb_put(skb, len); |
| 189 | sprintf(scratch, "%s@%s", action_string, devpath); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 191 | /* copy keys to our continuous event payload buffer */ |
| 192 | for (i = 2; envp[i]; i++) { |
| 193 | len = strlen(envp[i]) + 1; |
| 194 | scratch = skb_put(skb, len); |
| 195 | strcpy(scratch, envp[i]); |
| 196 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 198 | NETLINK_CB(skb).dst_group = 1; |
| 199 | netlink_broadcast(uevent_sock, skb, 0, 1, GFP_KERNEL); |
| 200 | } |
| 201 | } |
Kay Sievers | 4d17ffd | 2006-04-25 15:37:26 +0200 | [diff] [blame] | 202 | #endif |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 203 | |
| 204 | /* call uevent_helper, usually only enabled during early boot */ |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 205 | if (uevent_helper[0]) { |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 206 | char *argv [3]; |
| 207 | |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 208 | argv [0] = uevent_helper; |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 209 | argv [1] = (char *)subsystem; |
| 210 | argv [2] = NULL; |
Jeremy Fitzhardinge | 86313c4 | 2007-07-17 18:37:03 -0700 | [diff] [blame^] | 211 | call_usermodehelper (argv[0], argv, envp, UMH_WAIT_EXEC); |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 212 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | |
| 214 | exit: |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 215 | kfree(devpath); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | kfree(buffer); |
| 217 | kfree(envp); |
Aneesh Kumar K.V | 542cfce | 2006-12-19 13:01:27 -0800 | [diff] [blame] | 218 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | } |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 220 | |
| 221 | EXPORT_SYMBOL_GPL(kobject_uevent_env); |
| 222 | |
| 223 | /** |
| 224 | * kobject_uevent - notify userspace by ending an uevent |
| 225 | * |
| 226 | * @action: action that is happening (usually KOBJ_ADD and KOBJ_REMOVE) |
| 227 | * @kobj: struct kobject that the action is happening to |
Aneesh Kumar K.V | 542cfce | 2006-12-19 13:01:27 -0800 | [diff] [blame] | 228 | * |
| 229 | * Returns 0 if kobject_uevent() is completed with success or the |
| 230 | * corresponding error when it fails. |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 231 | */ |
Aneesh Kumar K.V | 542cfce | 2006-12-19 13:01:27 -0800 | [diff] [blame] | 232 | int kobject_uevent(struct kobject *kobj, enum kobject_action action) |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 233 | { |
Aneesh Kumar K.V | 542cfce | 2006-12-19 13:01:27 -0800 | [diff] [blame] | 234 | return kobject_uevent_env(kobj, action, NULL); |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 235 | } |
| 236 | |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 237 | EXPORT_SYMBOL_GPL(kobject_uevent); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | |
| 239 | /** |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 240 | * add_uevent_var - helper for creating event variables |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | * @envp: Pointer to table of environment variables, as passed into |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 242 | * uevent() method. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | * @num_envp: Number of environment variable slots available, as |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 244 | * passed into uevent() method. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | * @cur_index: Pointer to current index into @envp. It should be |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 246 | * initialized to 0 before the first call to add_uevent_var(), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | * and will be incremented on success. |
| 248 | * @buffer: Pointer to buffer for environment variables, as passed |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 249 | * into uevent() method. |
| 250 | * @buffer_size: Length of @buffer, as passed into uevent() method. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | * @cur_len: Pointer to current length of space used in @buffer. |
| 252 | * Should be initialized to 0 before the first call to |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 253 | * add_uevent_var(), and will be incremented on success. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | * @format: Format for creating environment variable (of the form |
| 255 | * "XXX=%x") for snprintf(). |
| 256 | * |
| 257 | * Returns 0 if environment variable was added successfully or -ENOMEM |
| 258 | * if no space was available. |
| 259 | */ |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 260 | int add_uevent_var(char **envp, int num_envp, int *cur_index, |
| 261 | char *buffer, int buffer_size, int *cur_len, |
| 262 | const char *format, ...) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | { |
| 264 | va_list args; |
| 265 | |
| 266 | /* |
| 267 | * We check against num_envp - 1 to make sure there is at |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 268 | * least one slot left after we return, since kobject_uevent() |
| 269 | * needs to set the last slot to NULL. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | */ |
| 271 | if (*cur_index >= num_envp - 1) |
| 272 | return -ENOMEM; |
| 273 | |
| 274 | envp[*cur_index] = buffer + *cur_len; |
| 275 | |
| 276 | va_start(args, format); |
| 277 | *cur_len += vsnprintf(envp[*cur_index], |
| 278 | max(buffer_size - *cur_len, 0), |
| 279 | format, args) + 1; |
| 280 | va_end(args); |
| 281 | |
| 282 | if (*cur_len > buffer_size) |
| 283 | return -ENOMEM; |
| 284 | |
| 285 | (*cur_index)++; |
| 286 | return 0; |
| 287 | } |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 288 | EXPORT_SYMBOL_GPL(add_uevent_var); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | |
Kay Sievers | 4d17ffd | 2006-04-25 15:37:26 +0200 | [diff] [blame] | 290 | #if defined(CONFIG_NET) |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 291 | static int __init kobject_uevent_init(void) |
| 292 | { |
| 293 | uevent_sock = netlink_kernel_create(NETLINK_KOBJECT_UEVENT, 1, NULL, |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 294 | NULL, THIS_MODULE); |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 295 | |
| 296 | if (!uevent_sock) { |
| 297 | printk(KERN_ERR |
| 298 | "kobject_uevent: unable to create netlink socket!\n"); |
| 299 | return -ENODEV; |
| 300 | } |
| 301 | |
| 302 | return 0; |
| 303 | } |
| 304 | |
| 305 | postcore_initcall(kobject_uevent_init); |
Kay Sievers | 4d17ffd | 2006-04-25 15:37:26 +0200 | [diff] [blame] | 306 | #endif |
Kay Sievers | 5f123fb | 2005-11-11 14:43:07 +0100 | [diff] [blame] | 307 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | #endif /* CONFIG_HOTPLUG */ |