3 The copy of klibc is removed. A systemwide installed version of klibc
4 can be used to buil a klibc udev.
8 NAME="" will not create any nodes, but execute RUN keys. To completely
9 ignore an event the OPTION "ignore_device" should be used.
11 After removal of the reorder queue, events with a TIMEOUT can be executed
12 without any queuing now.
16 Fixed bug in udevd, if inotify is not available. We depend on netlink
17 uevents now, kernels without that event source will not work with that
18 version of udev anymore.
22 The rule parsing happens now in the daemon once at startup, all udev
23 event processes inherit the already parsed rules from the daemon.
24 It is shipped with SUSE10.0 and reduces heavily the system load at
25 startup. The option to save precompiled rules and let the udev process
26 pick the them up is removed, as it's no longer needed.
28 Kernel 2.6.15 will have symlinks at /class/input pointing to the real
29 device. Libsysfs is changed to "translate" the requested link into the
30 real device path, as it would happen with the hotplug event. Otherwise
31 device removal and the udev database will not work.
33 Using 'make STRIPCMD=' will leave the binaries unstripped for debugging
36 A few improvements for vol_id, the filesytem probing code.
40 Fix a stupid typo in extras/run_directory for "make install".
42 scsi_id creates the temporary devnode now in /dev for usage with a
43 non-writable /tmp directory.
45 The uevent kernel socket buffer can carry app. 50.000 events now,
46 let's see who can break this again. :)
48 The upcoming kernel will have a new input driver core integration.
49 Some class devices are now symlinks to the real device. libsysfs
50 needs a fix for this to work correctly. Udevstart of older udev
51 versions will _not_ create these devices!
55 Fix a 'install' target in the Makefile, that prevents EXTRAS from
60 A bunch of mostly trivial bugfixes. From now on no node name or
61 symlink name can contain any character than plain whitelisted ascii
62 characters or validated utf8 byte-streams. This is needed for the
63 /dev/disk/by-label/* links, cause we import untrusted data and
64 export it to the filesystem.
68 More bugfixes. If udevd was started from the kernel, we don't
69 have stdin/stdout/stderr, which broke the forked tools in some
74 Bugfix. udevstart event ordering was broken for a long time.
75 The new run_program() uncovered it, cause /dev/null was not
76 available while we try to run external programs.
77 Now udevstart should create it before we run anything.
81 Minor bugfixes and some distro rules updates. If you don't have the
82 persistent disk rules in /dev/disk/by-*/* on your distro, just
87 We can use socket communication now to pass events from udev to
89 RUN+="socket:/org/freedesktop/hal/udev_event"
90 will pass the whole udev event to the HAL daemon without the need
91 for a forked helper. (See ChangeLog for udevmonitor, as an example)
95 Mostly bugfixes and see ChangeLog.
97 The test for the existence of an environment value should be
99 ENV{KEY}=="*" to ENV{KEY}=="?*"
100 cause "*" will not fail anymore, if the key does not exist or
105 Bugfixes and a few tweaks described in the ChangeLog.
109 Mostly a Bugfix release.
111 Added WAIT_FOR_SYSFS="<attribute>" to be able to fight against the sysfs
112 timing with custom rules.
116 We changed the internal rule storage format. Our large rule files took
117 2 MB of RAM, with the change we are down to 99kB.
119 If the device-node has been created with default name and no symlink or
120 options are to remenber, it is not longer stored in the udevdb. HAL will
121 need to be updated to work correctly with that change.
123 To overrride optimization flags, OPTFLAGS may be used now.
131 Major changes happened with this release. The goal is to take over the
132 complete kernel-event handling and provide a more efficient way to dispatch
133 kernel events. Replacing most of the current shell script logic and the
134 kernel forked helper with a netlink-daemon and a rule-based event handling.
136 o udevd listens to netlink events now. The first valid netlink event
137 will make udevd ignore any message from udevsend that contains a
138 SEQNUM, to avoid duplicate events. The forked events can be disabled
140 echo "" > /proc/sys/kernel/hotplug
141 For full support, the broken input-subsytem needs to be fixed, not to
142 bypass the driver core.
144 o /etc/dev.d/ + /etc/hotplug.d/ directory multiplexing is completely
145 removed from udev itself and must be emulated by calling small
146 helper binaries provided in the extras folder:
147 make EXTRAS=extras/run_directory/
148 will build udev_run_devd and udev_run_hotplugd, which can be called
149 from a rule if needed:
150 RUN+="/sbin/udev_run_hotplugd"
151 The recommended way to handle this is to convert all the calls from
152 the directories to explicit udev rules and get completely rid of the
153 multiplexing. (To catch a ttyUSB event, you now no longer need to
154 fork and exit 300 tty script instances you are not interested in, it
155 is just one rule that matches exactly the device.)
157 o udev handles now _all_ events not just events for class and block
158 devices, this way it is possible to control the complete event
159 behavior with udev rules. Especially useful for rules like:
160 ACTION="add", DEVPATH="/devices/*", MODALIAS=="?*", RUN+="/sbin/modprobe $modalias"
162 o As used in the modalias rule, udev supports now textual
163 substitution placeholder along with the usual format chars. This
164 needs to be documented, for now it's only visible in udev_rules_parse.c.
166 o The rule keys support now more operations. This is documented in the
167 man page. It is possible to add values to list-keys like the SYMLINK
168 and RUN list with KEY+="value" and to clear the list by assigning KEY="".
169 Also "final"-assignments are supported by using KEY:="value", which will
170 prevent changing the key by any later rule.
172 o kernel 2.6.12 has the "detached_state" attribute removed from
173 sysfs, which was used to recognize sysfs population. We switched that
174 to wait for the "bus" link, which is only available in kernels after 2.6.11.
175 Running this udev version on older kernels may cause a short delay for
178 o To provide infrastructure for persistent device naming, the id programs:
179 scsi_id, vol_id (former udev_volume_id), and ata_id (new) are able now
180 to export the probed data in environment key format:
181 pim:~ # /sbin/ata_id --export /dev/hda
182 ID_MODEL=HTS726060M9AT00
183 ID_SERIAL=MRH401M4G6UM9B
187 KERNEL="hd*[!0-9]", IMPORT="/sbin/ata_id --export $tempnode"
188 KERNEL="hd*[!0-9]", ENV{ID_SERIAL}=="?*", SYMLINK+="disk/by-id/$env{ID_MODEL}_$env{ID_SERIAL}"
191 kay@pim:~> tree /dev/disk
194 | |-- HTS726060M9AT00_MRH401M4G6UM9B -> ../../hda
195 | `-- IBM-Memory_Key -> ../../sda
197 | |-- swap -> ../../hda1
198 | |-- date -> ../../sda1
199 | `-- home -> ../../hda3
201 |-- 2E08712B0870F2E7 -> ../../hda3
202 |-- 9352cfef-7687-47bc-a2a3-34cf136f72e1 -> ../../hda1
203 |-- E845-7A89 -> ../../sda1
204 `-- b2a61681-3812-4f13-a4ff-920d70604299 -> ../../hda2
206 The IMPORT= operation will import these keys in the environment and make
207 it available for later PROGRAM= and RUN= executed programs. The keys are
208 also stored in the udevdb and can be queried from there with one of the
211 o A few binaries are silently added to the repository, which can be used
212 to replay kernel events from initramfs instead of using coldplug. udevd
213 can be instructed now to queue-up events while the stored events from
214 initramfs are filled into the udevd-queue. This code is still under
215 development and there is no documentation now besides the code itself.
216 The additional binaries get compiled, but are not installed by default.
218 o There is also a temporary fix for a performance problem where too many
219 events happen in parallel and every event needs to parse the rules.
220 udev can now read precompiled rules stored on disk. This is likely to be
221 replaced by a more elegant solution in a future udev version.
225 With kernel version 2.6.12, the sysfs file "detached_state" was removed.
226 Fix for libsysfs not to expect this file was added.
230 All rules are applied now, but only the first matching rule with a NAME-key
231 will be applied. All later rules with NAME-key are completely ignored. This
232 way system supplied symlinks or permissions gets applied to user-defined
236 Please check your rules setup, if you may need to add OPTIONS="last_rule"
237 to some rules, to keep the old behavior.
239 The rules are read on "remove"-events too. That makes is possible to match
240 with keys that are available on remove (KERNEL, SUBSYSTEM, ID, ENV, ...) to
241 instruct udev to ignore an event (OPTIONS="ignore_device").
242 The new ACTION-key may be used to let a rule act only at a "remove"-event.
244 The new RUN-key supports rule-based execution of programs after device-node
245 handling. This is meant as a general replacement for the dev.d/-directories
246 to give fine grained control over the execution of programs.
248 The %s{}-sysfs format char replacement values are searched at any of the
249 devices in the device chain now, not only at the class-device.
251 We support log priority levels now. The value udev_log in udev.conf is used
252 to determine what is printed to syslog. This makes it possible to
253 run a version with compiled-in debug messages in a production environment
254 which is sometimes needed to find a bug.
255 It is still possible to supress the inclusion of _any_ syslog usage with
256 USE_LOG=false to create the smallest possible binaries if needed.
257 The configured udev_log value can be overridden with the environment variable
262 Possible use of a system-wide klibc:
263 make USE_KLIBC=true KLCC=/usr/bin/klcc all
264 will link against an external klibc and our own version will be ignored.
268 We support an unlimited count of symlinks now.
270 If USE_STATIC=true is passed to a glibc build, we link statically and use
271 a built-in userdb parser to resolve user and group names.
273 The PLACE= key is gone. It can be replaced by an ID= for a long time, cause
274 we walk up the chain of physical devices to find a match.
276 The KEY="<value>" format supports '=', '==', '!=,' , '+=' now. This makes it
277 easy to skip certain attribute matches without composing rules with weird
278 character class negations like:
279 KERNEL="[!s][!c][!d]*"
280 this can now be replaced with:
282 The current simple '=' is still supported, and should work as it does today,
283 but existing rules should be converted if possible, to be better readable.
285 We have new ENV{}== key now, to match against a maximum of 5 environment
288 udevstart is its own binary again, cause we don't need co carry this araound
289 with every forked event.