3 Fix a stupid typo in extras/run_directory for "make install".
5 scsi_id creates the temporary devnode now in /dev for usage with a
6 non-writable /tmp directory.
8 The uevent kernel socket buffer can carry app. 50.000 events now,
9 let's see who can break this again. :)
11 The upcoming kernel will have a new input driver core integration.
12 Some class devices are now symlinks to the real device. libsysfs
13 needs a fix for this to work correctly. Udevstart of older udev
14 versions will _not_ create these devices!
18 Fix a 'install' target in the Makefile, that prevents EXTRAS from
23 A bunch of mostly trivial bugfixes. From now on no node name or
24 symlink name can contain any character than plain whitelisted ascii
25 characters or validated utf8 byte-streams. This is needed for the
26 /dev/disk/by-label/* links, cause we import untrusted data and
27 export it to the filesystem.
31 More bugfixes. If udevd was started from the kernel, we don't
32 have stdin/stdout/stderr, which broke the forked tools in some
37 Bugfix. udevstart event ordering was broken for a long time.
38 The new run_program() uncovered it, cause /dev/null was not
39 available while we try to run external programs.
40 Now udevstart should create it before we run anything.
44 Minor bugfixes and some distro rules updates. If you don't have the
45 persistent disk rules in /dev/disk/by-*/* on your distro, just
50 We can use socket communication now to pass events from udev to
52 RUN+="socket:/org/freedesktop/hal/udev_event"
53 will pass the whole udev event to the HAL daemon without the need
54 for a forked helper. (See ChangeLog for udevmonitor, as an example)
58 Mostly bugfixes and see ChangeLog.
60 The test for the existence of an environment value should be
62 ENV{KEY}=="*" to ENV{KEY}=="?*"
63 cause "*" will not fail anymore, if the key does not exist or
68 Bugfixes and a few tweaks described in the ChangeLog.
72 Mostly a Bugfix release.
74 Added WAIT_FOR_SYSFS="<attribute>" to be able to fight against the sysfs
75 timing with custom rules.
79 We changed the internal rule storage format. Our large rule files took
80 2 MB of RAM, with the change we are down to 99kB.
82 If the device-node has been created with default name and no symlink or
83 options are to remenber, it is not longer stored in the udevdb. HAL will
84 need to be updated to work correctly with that change.
86 To overrride optimization flags, OPTFLAGS may be used now.
94 Major changes happened with this release. The goal is to take over the
95 complete kernel-event handling and provide a more efficient way to dispatch
96 kernel events. Replacing most of the current shell script logic and the
97 kernel forked helper with a netlink-daemon and a rule-based event handling.
99 o udevd listens to netlink events now. The first valid netlink event
100 will make udevd ignore any message from udevsend that contains a
101 SEQNUM, to avoid duplicate events. The forked events can be disabled
103 echo "" > /proc/sys/kernel/hotplug
104 For full support, the broken input-subsytem needs to be fixed, not to
105 bypass the driver core.
107 o /etc/dev.d/ + /etc/hotplug.d/ directory multiplexing is completely
108 removed from udev itself and must be emulated by calling small
109 helper binaries provided in the extras folder:
110 make EXTRAS=extras/run_directory/
111 will build udev_run_devd and udev_run_hotplugd, which can be called
112 from a rule if needed:
113 RUN+="/sbin/udev_run_hotplugd"
114 The recommended way to handle this is to convert all the calls from
115 the directories to explicit udev rules and get completely rid of the
116 multiplexing. (To catch a ttyUSB event, you now no longer need to
117 fork and exit 300 tty script instances you are not interested in, it
118 is just one rule that matches exactly the device.)
120 o udev handles now _all_ events not just events for class and block
121 devices, this way it is possible to control the complete event
122 behavior with udev rules. Especially useful for rules like:
123 ACTION="add", DEVPATH="/devices/*", MODALIAS=="?*", RUN+="/sbin/modprobe $modalias"
125 o As used in the modalias rule, udev supports now textual
126 substitution placeholder along with the usual format chars. This
127 needs to be documented, for now it's only visible in udev_rules_parse.c.
129 o The rule keys support now more operations. This is documented in the
130 man page. It is possible to add values to list-keys like the SYMLINK
131 and RUN list with KEY+="value" and to clear the list by assigning KEY="".
132 Also "final"-assignments are supported by using KEY:="value", which will
133 prevent changing the key by any later rule.
135 o kernel 2.6.12 has the "detached_state" attribute removed from
136 sysfs, which was used to recognize sysfs population. We switched that
137 to wait for the "bus" link, which is only available in kernels after 2.6.11.
138 Running this udev version on older kernels may cause a short delay for
141 o To provide infrastructure for persistent device naming, the id programs:
142 scsi_id, vol_id (former udev_volume_id), and ata_id (new) are able now
143 to export the probed data in environment key format:
144 pim:~ # /sbin/ata_id --export /dev/hda
145 ID_MODEL=HTS726060M9AT00
146 ID_SERIAL=MRH401M4G6UM9B
150 KERNEL="hd*[!0-9]", IMPORT="/sbin/ata_id --export $tempnode"
151 KERNEL="hd*[!0-9]", ENV{ID_SERIAL}=="?*", SYMLINK+="disk/by-id/$env{ID_MODEL}_$env{ID_SERIAL}"
154 kay@pim:~> tree /dev/disk
157 | |-- HTS726060M9AT00_MRH401M4G6UM9B -> ../../hda
158 | `-- IBM-Memory_Key -> ../../sda
160 | |-- swap -> ../../hda1
161 | |-- date -> ../../sda1
162 | `-- home -> ../../hda3
164 |-- 2E08712B0870F2E7 -> ../../hda3
165 |-- 9352cfef-7687-47bc-a2a3-34cf136f72e1 -> ../../hda1
166 |-- E845-7A89 -> ../../sda1
167 `-- b2a61681-3812-4f13-a4ff-920d70604299 -> ../../hda2
169 The IMPORT= operation will import these keys in the environment and make
170 it available for later PROGRAM= and RUN= executed programs. The keys are
171 also stored in the udevdb and can be queried from there with one of the
174 o A few binaries are silently added to the repository, which can be used
175 to replay kernel events from initramfs instead of using coldplug. udevd
176 can be instructed now to queue-up events while the stored events from
177 initramfs are filled into the udevd-queue. This code is still under
178 development and there is no documentation now besides the code itself.
179 The additional binaries get compiled, but are not installed by default.
181 o There is also a temporary fix for a performance problem where too many
182 events happen in parallel and every event needs to parse the rules.
183 udev can now read precompiled rules stored on disk. This is likely to be
184 replaced by a more elegant solution in a future udev version.
188 With kernel version 2.6.12, the sysfs file "detached_state" was removed.
189 Fix for libsysfs not to expect this file was added.
193 All rules are applied now, but only the first matching rule with a NAME-key
194 will be applied. All later rules with NAME-key are completely ignored. This
195 way system supplied symlinks or permissions gets applied to user-defined
199 Please check your rules setup, if you may need to add OPTIONS="last_rule"
200 to some rules, to keep the old behavior.
202 The rules are read on "remove"-events too. That makes is possible to match
203 with keys that are available on remove (KERNEL, SUBSYSTEM, ID, ENV, ...) to
204 instruct udev to ignore an event (OPTIONS="ignore_device").
205 The new ACTION-key may be used to let a rule act only at a "remove"-event.
207 The new RUN-key supports rule-based execution of programs after device-node
208 handling. This is meant as a general replacement for the dev.d/-directories
209 to give fine grained control over the execution of programs.
211 The %s{}-sysfs format char replacement values are searched at any of the
212 devices in the device chain now, not only at the class-device.
214 We support log priority levels now. The value udev_log in udev.conf is used
215 to determine what is printed to syslog. This makes it possible to
216 run a version with compiled-in debug messages in a production environment
217 which is sometimes needed to find a bug.
218 It is still possible to supress the inclusion of _any_ syslog usage with
219 USE_LOG=false to create the smallest possible binaries if needed.
220 The configured udev_log value can be overridden with the environment variable
225 Possible use of a system-wide klibc:
226 make USE_KLIBC=true KLCC=/usr/bin/klcc all
227 will link against an external klibc and our own version will be ignored.
231 We support an unlimited count of symlinks now.
233 If USE_STATIC=true is passed to a glibc build, we link statically and use
234 a built-in userdb parser to resolve user and group names.
236 The PLACE= key is gone. It can be replaced by an ID= for a long time, cause
237 we walk up the chain of physical devices to find a match.
239 The KEY="<value>" format supports '=', '==', '!=,' , '+=' now. This makes it
240 easy to skip certain attribute matches without composing rules with weird
241 character class negations like:
242 KERNEL="[!s][!c][!d]*"
243 this can now be replaced with:
245 The current simple '=' is still supported, and should work as it does today,
246 but existing rules should be converted if possible, to be better readable.
248 We have new ENV{}== key now, to match against a maximum of 5 environment
251 udevstart is its own binary again, cause we don't need co carry this araound
252 with every forked event.