3 Fixed bug in udevd, if inotify is not available. We depend on netlink
4 uevents now, kernels without that event source will not work with that
5 version of udev anymore.
9 The rule parsing happens now in the daemon once at startup, all udev
10 event processes inherit the already parsed rules from the daemon.
11 It is shipped with SUSE10.0 and reduces heavily the system load at
12 startup. The option to save precompiled rules and let the udev process
13 pick the them up is removed, as it's no longer needed.
15 Kernel 2.6.15 will have symlinks at /class/input pointing to the real
16 device. Libsysfs is changed to "translate" the requested link into the
17 real device path, as it would happen with the hotplug event. Otherwise
18 device removal and the udev database will not work.
20 Using 'make STRIPCMD=' will leave the binaries unstripped for debugging
23 A few improvements for vol_id, the filesytem probing code.
27 Fix a stupid typo in extras/run_directory for "make install".
29 scsi_id creates the temporary devnode now in /dev for usage with a
30 non-writable /tmp directory.
32 The uevent kernel socket buffer can carry app. 50.000 events now,
33 let's see who can break this again. :)
35 The upcoming kernel will have a new input driver core integration.
36 Some class devices are now symlinks to the real device. libsysfs
37 needs a fix for this to work correctly. Udevstart of older udev
38 versions will _not_ create these devices!
42 Fix a 'install' target in the Makefile, that prevents EXTRAS from
47 A bunch of mostly trivial bugfixes. From now on no node name or
48 symlink name can contain any character than plain whitelisted ascii
49 characters or validated utf8 byte-streams. This is needed for the
50 /dev/disk/by-label/* links, cause we import untrusted data and
51 export it to the filesystem.
55 More bugfixes. If udevd was started from the kernel, we don't
56 have stdin/stdout/stderr, which broke the forked tools in some
61 Bugfix. udevstart event ordering was broken for a long time.
62 The new run_program() uncovered it, cause /dev/null was not
63 available while we try to run external programs.
64 Now udevstart should create it before we run anything.
68 Minor bugfixes and some distro rules updates. If you don't have the
69 persistent disk rules in /dev/disk/by-*/* on your distro, just
74 We can use socket communication now to pass events from udev to
76 RUN+="socket:/org/freedesktop/hal/udev_event"
77 will pass the whole udev event to the HAL daemon without the need
78 for a forked helper. (See ChangeLog for udevmonitor, as an example)
82 Mostly bugfixes and see ChangeLog.
84 The test for the existence of an environment value should be
86 ENV{KEY}=="*" to ENV{KEY}=="?*"
87 cause "*" will not fail anymore, if the key does not exist or
92 Bugfixes and a few tweaks described in the ChangeLog.
96 Mostly a Bugfix release.
98 Added WAIT_FOR_SYSFS="<attribute>" to be able to fight against the sysfs
99 timing with custom rules.
103 We changed the internal rule storage format. Our large rule files took
104 2 MB of RAM, with the change we are down to 99kB.
106 If the device-node has been created with default name and no symlink or
107 options are to remenber, it is not longer stored in the udevdb. HAL will
108 need to be updated to work correctly with that change.
110 To overrride optimization flags, OPTFLAGS may be used now.
118 Major changes happened with this release. The goal is to take over the
119 complete kernel-event handling and provide a more efficient way to dispatch
120 kernel events. Replacing most of the current shell script logic and the
121 kernel forked helper with a netlink-daemon and a rule-based event handling.
123 o udevd listens to netlink events now. The first valid netlink event
124 will make udevd ignore any message from udevsend that contains a
125 SEQNUM, to avoid duplicate events. The forked events can be disabled
127 echo "" > /proc/sys/kernel/hotplug
128 For full support, the broken input-subsytem needs to be fixed, not to
129 bypass the driver core.
131 o /etc/dev.d/ + /etc/hotplug.d/ directory multiplexing is completely
132 removed from udev itself and must be emulated by calling small
133 helper binaries provided in the extras folder:
134 make EXTRAS=extras/run_directory/
135 will build udev_run_devd and udev_run_hotplugd, which can be called
136 from a rule if needed:
137 RUN+="/sbin/udev_run_hotplugd"
138 The recommended way to handle this is to convert all the calls from
139 the directories to explicit udev rules and get completely rid of the
140 multiplexing. (To catch a ttyUSB event, you now no longer need to
141 fork and exit 300 tty script instances you are not interested in, it
142 is just one rule that matches exactly the device.)
144 o udev handles now _all_ events not just events for class and block
145 devices, this way it is possible to control the complete event
146 behavior with udev rules. Especially useful for rules like:
147 ACTION="add", DEVPATH="/devices/*", MODALIAS=="?*", RUN+="/sbin/modprobe $modalias"
149 o As used in the modalias rule, udev supports now textual
150 substitution placeholder along with the usual format chars. This
151 needs to be documented, for now it's only visible in udev_rules_parse.c.
153 o The rule keys support now more operations. This is documented in the
154 man page. It is possible to add values to list-keys like the SYMLINK
155 and RUN list with KEY+="value" and to clear the list by assigning KEY="".
156 Also "final"-assignments are supported by using KEY:="value", which will
157 prevent changing the key by any later rule.
159 o kernel 2.6.12 has the "detached_state" attribute removed from
160 sysfs, which was used to recognize sysfs population. We switched that
161 to wait for the "bus" link, which is only available in kernels after 2.6.11.
162 Running this udev version on older kernels may cause a short delay for
165 o To provide infrastructure for persistent device naming, the id programs:
166 scsi_id, vol_id (former udev_volume_id), and ata_id (new) are able now
167 to export the probed data in environment key format:
168 pim:~ # /sbin/ata_id --export /dev/hda
169 ID_MODEL=HTS726060M9AT00
170 ID_SERIAL=MRH401M4G6UM9B
174 KERNEL="hd*[!0-9]", IMPORT="/sbin/ata_id --export $tempnode"
175 KERNEL="hd*[!0-9]", ENV{ID_SERIAL}=="?*", SYMLINK+="disk/by-id/$env{ID_MODEL}_$env{ID_SERIAL}"
178 kay@pim:~> tree /dev/disk
181 | |-- HTS726060M9AT00_MRH401M4G6UM9B -> ../../hda
182 | `-- IBM-Memory_Key -> ../../sda
184 | |-- swap -> ../../hda1
185 | |-- date -> ../../sda1
186 | `-- home -> ../../hda3
188 |-- 2E08712B0870F2E7 -> ../../hda3
189 |-- 9352cfef-7687-47bc-a2a3-34cf136f72e1 -> ../../hda1
190 |-- E845-7A89 -> ../../sda1
191 `-- b2a61681-3812-4f13-a4ff-920d70604299 -> ../../hda2
193 The IMPORT= operation will import these keys in the environment and make
194 it available for later PROGRAM= and RUN= executed programs. The keys are
195 also stored in the udevdb and can be queried from there with one of the
198 o A few binaries are silently added to the repository, which can be used
199 to replay kernel events from initramfs instead of using coldplug. udevd
200 can be instructed now to queue-up events while the stored events from
201 initramfs are filled into the udevd-queue. This code is still under
202 development and there is no documentation now besides the code itself.
203 The additional binaries get compiled, but are not installed by default.
205 o There is also a temporary fix for a performance problem where too many
206 events happen in parallel and every event needs to parse the rules.
207 udev can now read precompiled rules stored on disk. This is likely to be
208 replaced by a more elegant solution in a future udev version.
212 With kernel version 2.6.12, the sysfs file "detached_state" was removed.
213 Fix for libsysfs not to expect this file was added.
217 All rules are applied now, but only the first matching rule with a NAME-key
218 will be applied. All later rules with NAME-key are completely ignored. This
219 way system supplied symlinks or permissions gets applied to user-defined
223 Please check your rules setup, if you may need to add OPTIONS="last_rule"
224 to some rules, to keep the old behavior.
226 The rules are read on "remove"-events too. That makes is possible to match
227 with keys that are available on remove (KERNEL, SUBSYSTEM, ID, ENV, ...) to
228 instruct udev to ignore an event (OPTIONS="ignore_device").
229 The new ACTION-key may be used to let a rule act only at a "remove"-event.
231 The new RUN-key supports rule-based execution of programs after device-node
232 handling. This is meant as a general replacement for the dev.d/-directories
233 to give fine grained control over the execution of programs.
235 The %s{}-sysfs format char replacement values are searched at any of the
236 devices in the device chain now, not only at the class-device.
238 We support log priority levels now. The value udev_log in udev.conf is used
239 to determine what is printed to syslog. This makes it possible to
240 run a version with compiled-in debug messages in a production environment
241 which is sometimes needed to find a bug.
242 It is still possible to supress the inclusion of _any_ syslog usage with
243 USE_LOG=false to create the smallest possible binaries if needed.
244 The configured udev_log value can be overridden with the environment variable
249 Possible use of a system-wide klibc:
250 make USE_KLIBC=true KLCC=/usr/bin/klcc all
251 will link against an external klibc and our own version will be ignored.
255 We support an unlimited count of symlinks now.
257 If USE_STATIC=true is passed to a glibc build, we link statically and use
258 a built-in userdb parser to resolve user and group names.
260 The PLACE= key is gone. It can be replaced by an ID= for a long time, cause
261 we walk up the chain of physical devices to find a match.
263 The KEY="<value>" format supports '=', '==', '!=,' , '+=' now. This makes it
264 easy to skip certain attribute matches without composing rules with weird
265 character class negations like:
266 KERNEL="[!s][!c][!d]*"
267 this can now be replaced with:
269 The current simple '=' is still supported, and should work as it does today,
270 but existing rules should be converted if possible, to be better readable.
272 We have new ENV{}== key now, to match against a maximum of 5 environment
275 udevstart is its own binary again, cause we don't need co carry this araound
276 with every forked event.