3 The rule parsing happens now in the daemon once at startup, all udev
4 event processes inherit the already parsed rules from the daemon.
5 It is shipped with SUSE10.0 and reduces heavily the system load at
8 using 'make STRIPCMD=' will leave the binaries unstripped for debugging
11 A few improvements for vol_id, the filesytem probing code.
15 Fix a stupid typo in extras/run_directory for "make install".
17 scsi_id creates the temporary devnode now in /dev for usage with a
18 non-writable /tmp directory.
20 The uevent kernel socket buffer can carry app. 50.000 events now,
21 let's see who can break this again. :)
23 The upcoming kernel will have a new input driver core integration.
24 Some class devices are now symlinks to the real device. libsysfs
25 needs a fix for this to work correctly. Udevstart of older udev
26 versions will _not_ create these devices!
30 Fix a 'install' target in the Makefile, that prevents EXTRAS from
35 A bunch of mostly trivial bugfixes. From now on no node name or
36 symlink name can contain any character than plain whitelisted ascii
37 characters or validated utf8 byte-streams. This is needed for the
38 /dev/disk/by-label/* links, cause we import untrusted data and
39 export it to the filesystem.
43 More bugfixes. If udevd was started from the kernel, we don't
44 have stdin/stdout/stderr, which broke the forked tools in some
49 Bugfix. udevstart event ordering was broken for a long time.
50 The new run_program() uncovered it, cause /dev/null was not
51 available while we try to run external programs.
52 Now udevstart should create it before we run anything.
56 Minor bugfixes and some distro rules updates. If you don't have the
57 persistent disk rules in /dev/disk/by-*/* on your distro, just
62 We can use socket communication now to pass events from udev to
64 RUN+="socket:/org/freedesktop/hal/udev_event"
65 will pass the whole udev event to the HAL daemon without the need
66 for a forked helper. (See ChangeLog for udevmonitor, as an example)
70 Mostly bugfixes and see ChangeLog.
72 The test for the existence of an environment value should be
74 ENV{KEY}=="*" to ENV{KEY}=="?*"
75 cause "*" will not fail anymore, if the key does not exist or
80 Bugfixes and a few tweaks described in the ChangeLog.
84 Mostly a Bugfix release.
86 Added WAIT_FOR_SYSFS="<attribute>" to be able to fight against the sysfs
87 timing with custom rules.
91 We changed the internal rule storage format. Our large rule files took
92 2 MB of RAM, with the change we are down to 99kB.
94 If the device-node has been created with default name and no symlink or
95 options are to remenber, it is not longer stored in the udevdb. HAL will
96 need to be updated to work correctly with that change.
98 To overrride optimization flags, OPTFLAGS may be used now.
106 Major changes happened with this release. The goal is to take over the
107 complete kernel-event handling and provide a more efficient way to dispatch
108 kernel events. Replacing most of the current shell script logic and the
109 kernel forked helper with a netlink-daemon and a rule-based event handling.
111 o udevd listens to netlink events now. The first valid netlink event
112 will make udevd ignore any message from udevsend that contains a
113 SEQNUM, to avoid duplicate events. The forked events can be disabled
115 echo "" > /proc/sys/kernel/hotplug
116 For full support, the broken input-subsytem needs to be fixed, not to
117 bypass the driver core.
119 o /etc/dev.d/ + /etc/hotplug.d/ directory multiplexing is completely
120 removed from udev itself and must be emulated by calling small
121 helper binaries provided in the extras folder:
122 make EXTRAS=extras/run_directory/
123 will build udev_run_devd and udev_run_hotplugd, which can be called
124 from a rule if needed:
125 RUN+="/sbin/udev_run_hotplugd"
126 The recommended way to handle this is to convert all the calls from
127 the directories to explicit udev rules and get completely rid of the
128 multiplexing. (To catch a ttyUSB event, you now no longer need to
129 fork and exit 300 tty script instances you are not interested in, it
130 is just one rule that matches exactly the device.)
132 o udev handles now _all_ events not just events for class and block
133 devices, this way it is possible to control the complete event
134 behavior with udev rules. Especially useful for rules like:
135 ACTION="add", DEVPATH="/devices/*", MODALIAS=="?*", RUN+="/sbin/modprobe $modalias"
137 o As used in the modalias rule, udev supports now textual
138 substitution placeholder along with the usual format chars. This
139 needs to be documented, for now it's only visible in udev_rules_parse.c.
141 o The rule keys support now more operations. This is documented in the
142 man page. It is possible to add values to list-keys like the SYMLINK
143 and RUN list with KEY+="value" and to clear the list by assigning KEY="".
144 Also "final"-assignments are supported by using KEY:="value", which will
145 prevent changing the key by any later rule.
147 o kernel 2.6.12 has the "detached_state" attribute removed from
148 sysfs, which was used to recognize sysfs population. We switched that
149 to wait for the "bus" link, which is only available in kernels after 2.6.11.
150 Running this udev version on older kernels may cause a short delay for
153 o To provide infrastructure for persistent device naming, the id programs:
154 scsi_id, vol_id (former udev_volume_id), and ata_id (new) are able now
155 to export the probed data in environment key format:
156 pim:~ # /sbin/ata_id --export /dev/hda
157 ID_MODEL=HTS726060M9AT00
158 ID_SERIAL=MRH401M4G6UM9B
162 KERNEL="hd*[!0-9]", IMPORT="/sbin/ata_id --export $tempnode"
163 KERNEL="hd*[!0-9]", ENV{ID_SERIAL}=="?*", SYMLINK+="disk/by-id/$env{ID_MODEL}_$env{ID_SERIAL}"
166 kay@pim:~> tree /dev/disk
169 | |-- HTS726060M9AT00_MRH401M4G6UM9B -> ../../hda
170 | `-- IBM-Memory_Key -> ../../sda
172 | |-- swap -> ../../hda1
173 | |-- date -> ../../sda1
174 | `-- home -> ../../hda3
176 |-- 2E08712B0870F2E7 -> ../../hda3
177 |-- 9352cfef-7687-47bc-a2a3-34cf136f72e1 -> ../../hda1
178 |-- E845-7A89 -> ../../sda1
179 `-- b2a61681-3812-4f13-a4ff-920d70604299 -> ../../hda2
181 The IMPORT= operation will import these keys in the environment and make
182 it available for later PROGRAM= and RUN= executed programs. The keys are
183 also stored in the udevdb and can be queried from there with one of the
186 o A few binaries are silently added to the repository, which can be used
187 to replay kernel events from initramfs instead of using coldplug. udevd
188 can be instructed now to queue-up events while the stored events from
189 initramfs are filled into the udevd-queue. This code is still under
190 development and there is no documentation now besides the code itself.
191 The additional binaries get compiled, but are not installed by default.
193 o There is also a temporary fix for a performance problem where too many
194 events happen in parallel and every event needs to parse the rules.
195 udev can now read precompiled rules stored on disk. This is likely to be
196 replaced by a more elegant solution in a future udev version.
200 With kernel version 2.6.12, the sysfs file "detached_state" was removed.
201 Fix for libsysfs not to expect this file was added.
205 All rules are applied now, but only the first matching rule with a NAME-key
206 will be applied. All later rules with NAME-key are completely ignored. This
207 way system supplied symlinks or permissions gets applied to user-defined
211 Please check your rules setup, if you may need to add OPTIONS="last_rule"
212 to some rules, to keep the old behavior.
214 The rules are read on "remove"-events too. That makes is possible to match
215 with keys that are available on remove (KERNEL, SUBSYSTEM, ID, ENV, ...) to
216 instruct udev to ignore an event (OPTIONS="ignore_device").
217 The new ACTION-key may be used to let a rule act only at a "remove"-event.
219 The new RUN-key supports rule-based execution of programs after device-node
220 handling. This is meant as a general replacement for the dev.d/-directories
221 to give fine grained control over the execution of programs.
223 The %s{}-sysfs format char replacement values are searched at any of the
224 devices in the device chain now, not only at the class-device.
226 We support log priority levels now. The value udev_log in udev.conf is used
227 to determine what is printed to syslog. This makes it possible to
228 run a version with compiled-in debug messages in a production environment
229 which is sometimes needed to find a bug.
230 It is still possible to supress the inclusion of _any_ syslog usage with
231 USE_LOG=false to create the smallest possible binaries if needed.
232 The configured udev_log value can be overridden with the environment variable
237 Possible use of a system-wide klibc:
238 make USE_KLIBC=true KLCC=/usr/bin/klcc all
239 will link against an external klibc and our own version will be ignored.
243 We support an unlimited count of symlinks now.
245 If USE_STATIC=true is passed to a glibc build, we link statically and use
246 a built-in userdb parser to resolve user and group names.
248 The PLACE= key is gone. It can be replaced by an ID= for a long time, cause
249 we walk up the chain of physical devices to find a match.
251 The KEY="<value>" format supports '=', '==', '!=,' , '+=' now. This makes it
252 easy to skip certain attribute matches without composing rules with weird
253 character class negations like:
254 KERNEL="[!s][!c][!d]*"
255 this can now be replaced with:
257 The current simple '=' is still supported, and should work as it does today,
258 but existing rules should be converted if possible, to be better readable.
260 We have new ENV{}== key now, to match against a maximum of 5 environment
263 udevstart is its own binary again, cause we don't need co carry this araound
264 with every forked event.